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Composition and structure of fish assemblage from Passa Cinco stream, Corumbatai river sub-basin, SP, Brazil/Composicao e estrutura da assembleia de peixes do Rio Passa Cinco, sub-bacia do rio Corumbatai, Sao Paulo, Brasil.

1. Introduction

Fish distribution in an environment is rarely caused by a single factor. Changes in the fish species composition from the headwaters to the lower parts is a common phenomenon and conceptual models based on temperate rivers seek to explain the mechanisms responsible for these processes (Matthews, 1998). Geomorphology is an important factor affecting the structure of fish communities in lotic environments (Allan, 1997), because from the headwaters to the mouth, the river goes through different terrain features, leading to changes in limnological characteristics and structural environment.

According to the river continuum concept (Vannote et al., 1980), we expect a gradual increase in species richness along the gradient, and the area of the middle section as the most diverse. These changes usually are associated with habitat changes along the gradient (Gorman and Karr, 1978). Matthews and Styron (1981) also suggested that the physical and chemical conditions in the headwaters are more stressful than in the lower portions, so that few fish species can colonize these areas.

Spatial patterns of species distribution have been addressed in several studies (Uieda, 1984; Garutti, 1988; Uieda and Barreto, 1999; Silvano et al., 2000; Mazzoni and Lobon-Cervia, 2000; Uieda and Uieda, 2001; Pavanelli and Caramaschi, 2003; Castro et al., 2003; Suarez and Petrere, 2003; Suarez and Petrere, 2005; Castro et al., 2004; Casatti, 2005; Braga and Andrade, 2005; Cetra and Petrere, 2006) that, in general, reported an increase in species diversity since the headwaters to the mouth in fish communities at different locations. The relationship between habitat and community composition was presented by Montag et al. (1997), Benedito-Cecilio et al. (2004) and Gomiero and Braga (2006), which showed the correlations between habitat diversity and general conditions in the environment.

Among the main patterns of longitudinal variation in stream fishes, there are the species additions and replacements (Gilliam et al., 1993; Petry and Schultz, 2006). Species additions are generally correlated with less severe environmental gradients, leading to smooth changes in abiotic and/or structural factors, while the species replacements occur as a result of abrupt changes in stream geomorphology or are related to abiotic conditions (Balon and Stewart, 1983; Winemiller and Leslie, 1992; Edds, 1993; Jackson et al., 2001; Wilkison and Edds, 2001; Ferreira and Petrere, 2009).

The Passa Cinco stream is one of the main rivers of the Corumbatai river sub-basin, that belongs to the Piracicaba river basin, one of the last options to provide good water quality to several municipalities. Situated next to major urban, agricultural, technological and scientific centres of southeastern Brazil, it has been degraded over a century, through soil use and occupancy, and by excessive withdrawal of water for human consumption and agriculture. Given the regional importance of these water bodies, the aim of this study was to determine the composition of the fish assemblages in Passa Cinco stream and measure the changes in their structure along the longitudinal gradient.

2. Material and Methods

This study was accomplished in the Passa Cinco stream, with headwaters localised in the Serra da Cachoeira a component of the complex of Serra de Itaqueri, in the municipal district of Itirapina. The drainage area of Passa Cinco stream is 525 [km.sup.2], covering about 60 km from its headwaters (with about 1000 m) to its confluence with the Corumbatai river (to 480 m) (Garcia et al., 2004). Currently, it has 51.72% of its area occupied by pastures, 14.13% by sugar cane, 15.67% by native forest and 0.74% by savanna (Valente and Vettorazzi, 2002).

Six samplings were accomplished at five different sites in Passa Cinco stream, contemplating sections of order two, three, four, five and six, according to the Strahler (1952) classification, with the following geographic coordinates: site 1 (order 2)--22[degrees]23' 36" S and 47[degrees]53' 08" W, site 2 (order 3)--22[degrees]22' 10" S and 47[degrees]51' 22" W, site 3 (order 4)--22[degrees]21' 63" S and 47[degrees]48' 48" W, site 4 (order 5) --22[degrees]24' 74" S and 47[degrees]43' 34" W and site 5 (order 6) 22[degrees] 30' 97" S and 47[degrees]39' 49" W in the months of May, July, September and November of 2005 and January and March of 2006 (Figures 1 and 2).

In each sample site, the predominant substrate type was recorded, as well as presence/absence of riparian vegetation, degree of shading, type of current and mean depth, as shown by Rondineli and Braga (2009). From these data, the habitat heterogeneity at each site was estimated using the Shannon diversity index (Gorman and Karr, 1978).

The fishery equipment used was electric fishery and gill nets. The electric fishery equipment (which consists of a generator that provides power--110 V--for a rectifier current that has the capacity to increase the voltage--up to 1500 V--and reduce the amperage--to 2 A) was used in the first three sites (1, 2 and 3). In these sites we performed a downstream-upstream pass at 50 m stretches without using contention nets. Gill nets (with mesh sizes varying from 3 to 9 cm between adjacent knots) were used in sites 3, 4 and 5. The sequence of gill nets was determined at random and placed in the afternoon (between 15 and 18 hours) remaining until the following morning. After each collection, fish were put into plastic bags, fixed in 10% formalin for 2 days and then transferred to 70% ethanol until the analysis was accomplished. In the laboratory, the fishes were identified to species level, measured for total length (cm) and weighed (g). Voucher specimens were deposited in the Ichthyology Laboratory, Department of Zoology of the Universidade Estadual Paulista, in Rio Claro.

The indexes of Shannon's diversity, Pielou's evenness and Margalef's richness were calculated for each sample site, separating the individuals captured by electric fishery from those captured by gill nets. To determine mean differences, ANOVAs were performed for each index to compare the sites sampled with the same fishery equipment (P1, P2 and P3--electric fishery and P3, P4 and P5--gill nets).

The representativeness of the species were summarised by their mean values of abundance ([bar.N] = N/[F.sub.0]) and weight ([bar.P] = P/[F.sub.0]), where N is the number of individuals, P the weight and [F.sub.0] the frequency of occurrence (Ferreira, 2007). Thus, [bar.N] and [bar.P] measure the local importance of each species sampled in each order. The species most and least important were highlighted. This analysis was performed for each sample site, considering the different fishery equipment.

[FIGURE 1 OMITTED]

3. Results

The substrate type changed gradually from site 1 to site 5, the marginal vegetation (presence of grasses along the streams bank) occurred in all sampling sites, except for site 1. The degree of shading decreased from the headwater to the mouth. The types of predominant current were: riffle in site 1, riffle and run in site 2, riffle, run and pool in site 3 and run in sites 4 and 5. The mean depth increased from upstream to downstream (Table 1 and Figure 2). Site 3 showed the highest diversity of habitats, followed by sites 5 and 4 (Figure 3).

We captured 5082 individuals belonging to 61 species. Characidium aff. zebra was the most abundant species (Table 2). The number of individuals, species richness and the indexes of Shannon's diversity, Margalef's richness and Pielou's evenness are shown in Table 3 for each site and fishing gear. The largest catches occurred in sites 3, 2 and 1 sampled with electric fishery. The greatest richness and diversity were obtained in site 3, regardless of the fishing gear used. The evenness index values for all sites were around 0.8.

For sites 1 to 3 (electric fishery), the ANOVA showed significant differences (p < 0.001, Table 4) in the indexes of richness, diversity and evenness. So we can accept that the Shannon diversity changed due to variation in either richness and evenness. For sites 3 to 5 (gill nets), only the richness index differed significantly (p = 0.047, Table 4).

Figure 4 presents the mean values, standard errors and 95% confidence intervals for the indexes of diversity, richness and evenness as well as for the number of individuals in the five sampling sites, considering separately the sites sampled with electric fishery (sites 1, 2 and 3) and gillnets (sites 3, 4 and 5). An increase in diversity, evenness and richness can be found from site 1 to site 3. Moreover, a decrease in richness was found from site 3 to site 5, with the lowest value found in site 4. Regarding the number of individuals, there is a greater abundance in places where electric fishery was used. However, the fishery equipment had more subtle effects on the indexes of diversity, evenness and richness, as shown in site 3, the only one in which it was possible to apply the two techniques.

When species composition was analysed in terms of mean weight and mean abundance per sample, it is possible to see which will best represent the sampled sites. When considering only the individuals captured with electric fishery Characidium aff. zebra, Trichomycterus sp.1, Imparfinis mirini and Cetopsorhamdia iheringi were the most important species in site 1 (Figure 5); Characidium aff. zebra, Trichomycterus sp.1, Bryconamericus stramineus and B. turiuba in site 2 (Figure 6); and C. aff. zebra, Hypostomus strigaticeps, Parodon nasus and Apereiodon ibitiensis in site 3 (Figure 7). Whereas individuals caught with nets, H. strigaticeps was the most important species in site 3 (Figure 8); in site 4, Odontostilbe aff. microcephala, Astyanatx sp.1, A. altiparanae and H. strigaticeps stood out (Figure 9); and in site 5, H. strigaticeps and A. altiparanae were the most important species (Figure 10).

[FIGURE 2 OMITTED]

[FIGURE 3 OMITTED]

[FIGURE 4 OMITTED]

[FIGURE 5 OMITTED]

4. Discussion

The Passa Cinco stream has a steep gradient, given its location in the cuestas of Sao Pedro and Analandia. In the headwaters, the water flow is faster, and the stream is more shallow and narrow. These characteristics directly influence the substrate composition. In such places, the rocks are slightly larger and little suspended matter or background particulates are verified. All these features will be inverted along the channel. The large amount of water received in a short time, resulting from heavy rains in summer, makes the environment very susceptible to runoff, that quickly raises the water level. The substrate, depth and current are some of the most important physical aspects in determining the distribution of stream fishes (Gorman and Karr, 1978; Argermeier and Karr, 1983). The combination of each aspects of these environmental characteristics produces a mosaic of microhabitats that changes along the gradient according to the physical conditions, which requires adjustments in the biological communities living there (Vannote et al., 1980).

[FIGURE 6 OMITTED]

[FIGURE 7 OMITTED]

[FIGURE 8 OMITTED]

In Sao Paulo state, the Alto Parana system includes the major rivers and contains 38 families and 310 species of fish described (Langeani et al., 2007). In association with these major rivers, there is a large number of headwater streams inhabited mainly by species of small fishes with restricted geographic distributions, such as Bryconamericus turiuba, Astyanax bockmanni and Corumbataia cuestae. The Passa Cinco stream is one of these streams with large numbers of small-sized species, some with restricted distributions.

[FIGURE 9 OMITTED]

[FIGURE 10 OMITTED]

Considering species diversity, richness and evenness, there was an increase from site 1 to 3, with further decrease in sites 4 and 5, agreeing with the values of the habitat's diversity. These patterns are not due exclusively to the fishery equipment employed, since site 3 was sampled with different equipments. In this site, all values had comparable magnitudes except number of individuals, which was remarkably higher in the electric fishery sites. The ANOVA confirmed the increasing pattern of diversity, evenness and richness from site 1 to 3.

For individuals caught with nets, significant differences were observed only for the richness index. This was because sites 4 and 5 had the lowest number of species. The upstream reaches had lower habitat diversity than the downstream ones (Uieda and Barreto, 1999), which may explain the common pattern of higher species richness at lower portions (Gorman and Karr, 1978). Harrel et al. (1967) apud Peres-Neto (1995) suggest that an increase in species diversity along the river course can occur not only due to an increase in suitable habitats, but also a decrease in environmental fluctuations. The more severe and variable conditions in the headwaters requires from the organisms specific adaptations and higher energy to move against the current and to lessen the likelihood of being swept downstream (Allan, 1997). In more stable sites downstream, where the current is slower or even at a standstill, less energy expenditure is necessary from the individuals to stay in their positions (Allan, 1997).

Although there are fewer species in headwaters sites, there are larger populations, whereas in the downstream sections, the number of species increases and their population densities decrease. The species abundance distribution becomes more homogeneous leading to a higher evenness. This pattern can be seen for sites 1 to 3 (electric fishery) and sites 3 to 4 (gillnets). The same patterns would be expected following the increase in water volume (Garutti, 1988), but in this case, it would be necessary that the environment had a variety of physical structures to provide suitable habitats (Gorman and Karr, 1978; Argermeier and Karr, 1983). On the other hand, when the physical structures inside the stream channel are simplified, the increase in water volume can lead to an environmental homogenisation, as was observed for sites 4 to 5 in the Passa Cinco Stream.

Besides the occurrence and number of individuals, the species importance can also be defined by weight. These three additional measures provide different information about the fish assemblage (Ferreira, 2007). When considering only the species captured with electric fishery, Characidium aff. zebra was the most important species in the first three sample sites, occurring in large numbers and high weight. In addition to C. aff. zebra, other species were important for these sites (Trichomycterus sp.1, Imparfinis mirini, Cetopsorhamdia iheringi, Bryconamericus stramineus, B. turiuba, Apereiodon ibitiensis, Parodon nasus e Hypostomus strigaticeps). Headwater stream fishes from different families have morphological traits that allow them to better explore these environments (Braga, 2004). When considering individuals caught with nets (middle-lower portions), H. strigaticeps was the most important species in site 3, and remained important downstream, joining Odontostilbe aff. microcephala, Astyanax sp.1 and A. altiparanae. We suggest that the species mean abundance and weight are more or less related to population densities at each site. If so, we agree with Mazzoni (1998) that the structural components of the stream channel promote differential resource availability along the longitudinal gradient that, in turn, are correlated to these densities.

5. Conclusions

Considering the number of individuals and biomass, as well the changes in diversity, evenness and richness, it was found that, despite the short size of the Passa Cinco stream, the environments are well defined, and structured in headwater, transition (medium-low) and mouth portions. This was evidenced by the species distribution and assemblage composition along the gradient.

Acknowledgements--The authors would like to thank FAPESP (proc. no. 04/12669-3) and CNPq for financial support, IBAMA (proc. no. 02027.000234/2005-05) for authorising the license for the execution of fieldwork, professors Julio C. Garavello, Francisco Langeani and Heraldo A. Britski for fish identification, the designer Jaime R. Somera for map confection, and the two anonymous reviewers for suggestions proposed.

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Carmassi, AL. (a) *, Rondineli, G. (b), Ferreira, FC. (c) and Braga, FMS. (a)

(a) Departamento de Zoologia, Instituto de Biociencias, Universidade Estadual Paulista--UNESP, Av. 24A, 1515, Bela Vista, CP 199, CEP 13506-900, Rio Claro, SP, Brazil

(b) Departamento de Producao Vegetal, Centro de Ciencias Agrarias, Universidade Federal do Espirito Santo--UFES, Alto Universitario, s/n, Guararema, CP 16, CEP 29500-000, Alegre, ES, Brazil

(c) Departamento de Ecologia, Instituto de Biociencias, Universidade Estadual Paulista--UNESP, Av. 24A, 1515, Bela Vista, CP 199, CEP 13506-900, Rio Claro, SP, Brazil

* e-mail: alberto.carmassi@gmail.com

Received December 9, 2010--Accepted April 13, 2011--Distributed February 29, 2012

(With 10 figures)
Table 1. Bottom type, marginal vegetation, degree of shading,
current type and mean width found in each of the sampling
sites of Passa Cinco stream.

Sites   Bottom    Marginal    Degree of   Current     Mean
         type    vegetation    shading     type     width (m)

1       pebble     absent       > 76%     riffle     shallow
2       pebble    present      51-75%     riffle     shallow
        gravel                              run
3       pebble    present      26-50%     riffle    moderate
        gravel                              run
         sand                              pool
4        sand     present      26-50%       run       Deep
5        sand     present       0-25%       run       Deep

Table 2. Fish species caught in the Passa Cinco stream for each
sample site in decreasing order of abundance.

Code                Species                 Descriptor          P1

Czeb       Characidium aff. zebra      (Eigenmann, 1909)       212
Pcau       Phalloceros harpagus        Lucinda, 2008           202
Astysp1    Astyanax sp.1                                       118
Hstri      Hypostomus strigaticeps     (Regan, 1908)            9
Trichsp1   Trichomycterus sp.1                                 199
Bstr       Bryconamericus stramineus   Eigenmann, 1908          4
Omic       Odontostilbe aff.           Eigenmann, 1907          1
             microcephala
Imir       Imparfinis mirini           Hasemann, 1911          110
Btur       Bryconamericus turiuba      Langeani, de             5
                                         Lucena, Pedrini &
                                         Tarelho-Pereira,
                                         2005
Apar       Astyanax scabripinnis       Eigenmann, 1914          83
             paranae
Cihe       Cetopsorhamdia iheringi     Schubart & Gomes,        57
                                         1959
Ccue       Corumbataia cuestae         Britski, 1997            2
Aalt       Astyanax altiparanae        Garutti & Britskii,      7
                                         2000
Aibi       Apareiodon ibitiensis       Amaral Campos, 1944      1
Pnas       Parodon nasus               Kner, 1859               0
Aboc       Astyanax bockmanni          Vari & Castro, 2007      3
Cfla       Corydoras flaveolus         Ihering, 1911            0
Imbor      Imparfinis borodini         Mees & Cala, 1989        14
Parg       Piabina argentea            Reinhardt, 1867          0
Rque       Rhamdia quelen              (Quoy & Gaimard,         15
                                         1824)
Hanc       Hypostomus ancistroides     (Ihering, 1911)          6
Hypsp1     Hypostomus sp.1                                      4
Gbra       Geophagus brasiliensis      Kner, 1865               0
Afas       Astyanax fasciatus          (Cuvier, 1819)           0
Aaff       Apareiodon affinis          (Steindachner, 1879)     0
Rlat       Rineloricaria latirostis    (Boulenger, 1900)        1
Hison      Hisonotus sp.                                        0
Pimesp1    Pimelodella sp.1                                     0
Ains       Steidachnerina              (Fernandez-Yepez,        0
             insculpita                  1948)
Hher       Hypostomus cf. hermanni     (Ihering, 1905)          0
Neop       Neoplecostomus sp.                                   7
Microg     Microglanis cf.                                      0
             garavelloi
Lfri       Leporinus friderici         (Bloch, 1794)            0
Gcar       Gymnotus cf. carapo         Linnaeus, 1758           0
Hins       Hisonotus insperatus        Britski & Garavello,     0
                                         2003
Pret       Poecilia reticulata         Peters, 1859             0
Evir       Eigenmannia virescens       (Valenciennes, 1836)     0
Isch       Imparfinis schubarti        (Gomes, 1956)            0
Lstr       Leporinus striatus          Kner, 1858               0
Cgom       Characidium gomesi          Travassos, 1956          0
Cmod       Cyphocharax modestus        (Fernandez-Yepez,        0
                                         1948)
Plin       Prochilodus lineatus        (Valenciennes, 1836)     0
Hequ       Hyphessobrycon eques        (Steindachner, 1882)     0
Hypsp2     Hypostomus sp.2                                      0
Bryc       Bryconamericus sp.                                   0
Hmal       Hoplias cf. malabaricus     (Bloch, 1794)            0
Cgob       Cetopsis gobioides          Kner, 1858               0
Hypsp3     Hypostomus sp.3                                      0
Caen       Corydoras aeneus            (Gill, 1858)             0
Sspi       Serrasalmus maculatus       Kner, 1858               0
Pbri       Planaltina britski          Menezes, Weitzman &      0
                                         Burns, 2003
Loct       Leporinus octofasciatus     Steindachner, 1915       0
Lpir       Loricaria cf. piracicabae   Ihering, 1907            0
Cvan       Cyphocharax vanderi         (Britski, 1980)          1
Lvit       Leporellus vittatus         (Valenciennes, 1850)     0
Trichsp2   Trichomycterus sp.2                                  0
Cjag       Crenicichla jaguarensis     Haseman, 1911            0
Hyph       Hyphessobrycon sp.                                   0
Smar       Synbranchus marmoratus      Haseman, 1911            0
Hlit       Hoplosternum littorale      (Hancock, 1828)          0
Aden       Aphyocharax dentatus        Eigennmann & Kennedy,    0
                                         1903

                                       Total                   1061

Code                Species                 Descriptor          P2

Czeb       Characidium aff. zebra      (Eigenmann, 1909)       408
Pcau       Phalloceros harpagus        Lucinda, 2008           275
Astysp1    Astyanax sp.1                                       104
Hstri      Hypostomus strigaticeps     (Regan, 1908)            36
Trichsp1   Trichomycterus sp.1                                  93
Bstr       Bryconamericus stramineus   Eigenmann, 1908         129
Omic       Odontostilbe aff.           Eigenmann, 1907          2
             microcephala
Imir       Imparfinis mirini           Hasemann, 1911           69
Btur       Bryconamericus turiuba      Langeani, de            119
                                         Lucena, Pedrini &
                                         Tarelho-Pereira,
                                         2005
Apar       Astyanax scabripinnis       Eigenmann, 1914          97
             paranae
Cihe       Cetopsorhamdia iheringi     Schubart & Gomes,        41
                                         1959
Ccue       Corumbataia cuestae         Britski, 1997           112
Aalt       Astyanax altiparanae        Garutti & Britskii,      13
                                         2000
Aibi       Apareiodon ibitiensis       Amaral Campos, 1944      38
Pnas       Parodon nasus               Kner, 1859               9
Aboc       Astyanax bockmanni          Vari & Castro, 2007      26
Cfla       Corydoras flaveolus         Ihering, 1911            24
Imbor      Imparfinis borodini         Mees & Cala, 1989        25
Parg       Piabina argentea            Reinhardt, 1867          31
Rque       Rhamdia quelen              (Quoy & Gaimard,         15
                                         1824)
Hanc       Hypostomus ancistroides     (Ihering, 1911)          4
Hypsp1     Hypostomus sp.1                                      1
Gbra       Geophagus brasiliensis      Kner, 1865               3
Afas       Astyanax fasciatus          (Cuvier, 1819)           0
Aaff       Apareiodon affinis          (Steindachner, 1879)     0
Rlat       Rineloricaria latirostis    (Boulenger, 1900)        3
Hison      Hisonotus sp.                                        0
Pimesp1    Pimelodella sp.1                                     0
Ains       Steidachnerina              (Fernandez-Yepez,        0
             insculpita                  1948)
Hher       Hypostomus cf. hermanni     (Ihering, 1905)          0
Neop       Neoplecostomus sp.                                   0
Microg     Microglanis cf.                                      0
             garavelloi
Lfri       Leporinus friderici         (Bloch, 1794)            0
Gcar       Gymnotus cf. carapo         Linnaeus, 1758           0
Hins       Hisonotus insperatus        Britski & Garavello,     0
                                         2003
Pret       Poecilia reticulata         Peters, 1859             0
Evir       Eigenmannia virescens       (Valenciennes, 1836)     2
Isch       Imparfinis schubarti        (Gomes, 1956)            0
Lstr       Leporinus striatus          Kner, 1858               0
Cgom       Characidium gomesi          Travassos, 1956          0
Cmod       Cyphocharax modestus        (Fernandez-Yepez,        0
                                         1948)
Plin       Prochilodus lineatus        (Valenciennes, 1836)     0
Hequ       Hyphessobrycon eques        (Steindachner, 1882)     0
Hypsp2     Hypostomus sp.2                                      0
Bryc       Bryconamericus sp.                                   0
Hmal       Hoplias cf. malabaricus     (Bloch, 1794)            0
Cgob       Cetopsis gobioides          Kner, 1858               1
Hypsp3     Hypostomus sp.3                                      0
Caen       Corydoras aeneus            (Gill, 1858)             0
Sspi       Serrasalmus maculatus       Kner, 1858               0
Pbri       Planaltina britski          Menezes, Weitzman &      0
                                         Burns, 2003
Loct       Leporinus octofasciatus     Steindachner, 1915       0
Lpir       Loricaria cf. piracicabae   Ihering, 1907            0
Cvan       Cyphocharax vanderi         (Britski, 1980)          0
Lvit       Leporellus vittatus         (Valenciennes, 1850)     0
Trichsp2   Trichomycterus sp.2                                  0
Cjag       Crenicichla jaguarensis     Haseman, 1911            0
Hyph       Hyphessobrycon sp.                                   0
Smar       Synbranchus marmoratus      Haseman, 1911            0
Hlit       Hoplosternum littorale      (Hancock, 1828)          0
Aden       Aphyocharax dentatus        Eigennmann & Kennedy,    0
                                         1903

                                       Total                   1680

Code                Species                 Descriptor          P3

Czeb       Characidium aff. zebra      (Eigenmann, 1909)       282
Pcau       Phalloceros harpagus        Lucinda, 2008            99
Astysp1    Astyanax sp.1                                        44
Hstri      Hypostomus strigaticeps     (Regan, 1908)           181
Trichsp1   Trichomycterus sp.1                                  51
Bstr       Bryconamericus stramineus   Eigenmann, 1908          44
Omic       Odontostilbe aff.           Eigenmann, 1907          58
             microcephala
Imir       Imparfinis mirini           Hasemann, 1911           47
Btur       Bryconamericus turiuba      Langeani, de             67
                                         Lucena, Pedrini &
                                         Tarelho-Pereira,
                                         2005
Apar       Astyanax scabripinnis       Eigenmann, 1914          6
             paranae
Cihe       Cetopsorhamdia iheringi     Schubart & Gomes,        70
                                         1959
Ccue       Corumbataia cuestae         Britski, 1997            39
Aalt       Astyanax altiparanae        Garutti & Britskii,      42
                                         2000
Aibi       Apareiodon ibitiensis       Amaral Campos, 1944      71
Pnas       Parodon nasus               Kner, 1859               86
Aboc       Astyanax bockmanni          Vari & Castro, 2007      46
Cfla       Corydoras flaveolus         Ihering, 1911            32
Imbor      Imparfinis borodini         Mees & Cala, 1989        30
Parg       Piabina argentea            Reinhardt, 1867          25
Rque       Rhamdia quelen              (Quoy & Gaimard,         15
                                         1824)
Hanc       Hypostomus ancistroides     (Ihering, 1911)          12
Hypsp1     Hypostomus sp.1                                      25
Gbra       Geophagus brasiliensis      Kner, 1865               21
Afas       Astyanax fasciatus          (Cuvier, 1819)           11
Aaff       Apareiodon affinis          (Steindachner, 1879)     10
Rlat       Rineloricaria latirostis    (Boulenger, 1900)        7
Hison      Hisonotus sp.                                        14
Pimesp1    Pimelodella sp.1                                     1
Ains       Steidachnerina              (Fernandez-Yepez,        1
             insculpita                  1948)
Hher       Hypostomus cf. hermanni     (Ihering, 1905)          10
Neop       Neoplecostomus sp.                                   3
Microg     Microglanis cf.                                      7
             garavelloi
Lfri       Leporinus friderici         (Bloch, 1794)            1
Gcar       Gymnotus cf. carapo         Linnaeus, 1758           6
Hins       Hisonotus insperatus        Britski & Garavello,     0
                                         2003
Pret       Poecilia reticulata         Peters, 1859             2
Evir       Eigenmannia virescens       (Valenciennes, 1836)     0
Isch       Imparfinis schubarti        (Gomes, 1956)            3
Lstr       Leporinus striatus          Kner, 1858               0
Cgom       Characidium gomesi          Travassos, 1956          4
Cmod       Cyphocharax modestus        (Fernandez-Yepez,        0
                                         1948)
Plin       Prochilodus lineatus        (Valenciennes, 1836)     3
Hequ       Hyphessobrycon eques        (Steindachner, 1882)     3
Hypsp2     Hypostomus sp.2                                      0
Bryc       Bryconamericus sp.                                   1
Hmal       Hoplias cf. malabaricus     (Bloch, 1794)            0
Cgob       Cetopsis gobioides          Kner, 1858               1
Hypsp3     Hypostomus sp.3                                      2
Caen       Corydoras aeneus            (Gill, 1858)             1
Sspi       Serrasalmus maculatus       Kner, 1858               0
Pbri       Planaltina britski          Menezes, Weitzman &      0
                                         Burns, 2003
Loct       Leporinus octofasciatus     Steindachner, 1915       0
Lpir       Loricaria cf. piracicabae   Ihering, 1907            0
Cvan       Cyphocharax vanderi         (Britski, 1980)          0
Lvit       Leporellus vittatus         (Valenciennes, 1850)     1
Trichsp2   Trichomycterus sp.2                                  0
Cjag       Crenicichla jaguarensis     Haseman, 1911            0
Hyph       Hyphessobrycon sp.                                   0
Smar       Synbranchus marmoratus      Haseman, 1911            0
Hlit       Hoplosternum littorale      (Hancock, 1828)          0
Aden       Aphyocharax dentatus        Eigennmann & Kennedy,    0
                                         1903

                                       Total                   1485

Code                Species                 Descriptor         P4

Czeb       Characidium aff. zebra      (Eigenmann, 1909)       21
Pcau       Phalloceros harpagus        Lucinda, 2008            0
Astysp1    Astyanax sp.1                                       61
Hstri      Hypostomus strigaticeps     (Regan, 1908)           19
Trichsp1   Trichomycterus sp.1                                  0
Bstr       Bryconamericus stramineus   Eigenmann, 1908         90
Omic       Odontostilbe aff.           Eigenmann, 1907         82
             microcephala
Imir       Imparfinis mirini           Hasemann, 1911           1
Btur       Bryconamericus turiuba      Langeani, de             0
                                         Lucena, Pedrini &
                                         Tarelho-Pereira,
                                         2005
Apar       Astyanax scabripinnis       Eigenmann, 1914          0
             paranae
Cihe       Cetopsorhamdia iheringi     Schubart & Gomes,        6
                                         1959
Ccue       Corumbataia cuestae         Britski, 1997            5
Aalt       Astyanax altiparanae        Garutti & Britskii,     25
                                         2000
Aibi       Apareiodon ibitiensis       Amaral Campos, 1944      0
Pnas       Parodon nasus               Kner, 1859               1
Aboc       Astyanax bockmanni          Vari & Castro, 2007      8
Cfla       Corydoras flaveolus         Ihering, 1911            5
Imbor      Imparfinis borodini         Mees & Cala, 1989        0
Parg       Piabina argentea            Reinhardt, 1867          0
Rque       Rhamdia quelen              (Quoy & Gaimard,         3
                                         1824)
Hanc       Hypostomus ancistroides     (Ihering, 1911)          7
Hypsp1     Hypostomus sp.1                                      5
Gbra       Geophagus brasiliensis      Kner, 1865               6
Afas       Astyanax fasciatus          (Cuvier, 1819)           0
Aaff       Apareiodon affinis          (Steindachner, 1879)     1
Rlat       Rineloricaria latirostis    (Boulenger, 1900)        2
Hison      Hisonotus sp.                                        3
Pimesp1    Pimelodella sp.1                                     0
Ains       Steidachnerina              (Fernandez-Yepez,        1
             insculpita                  1948)
Hher       Hypostomus cf. hermanni     (Ihering, 1905)          0
Neop       Neoplecostomus sp.                                   0
Microg     Microglanis cf.                                      0
             garavelloi
Lfri       Leporinus friderici         (Bloch, 1794)            0
Gcar       Gymnotus cf. carapo         Linnaeus, 1758           0
Hins       Hisonotus insperatus        Britski & Garavello,     5
                                         2003
Pret       Poecilia reticulata         Peters, 1859             3
Evir       Eigenmannia virescens       (Valenciennes, 1836)     3
Isch       Imparfinis schubarti        (Gomes, 1956)            1
Lstr       Leporinus striatus          Kner, 1858               0
Cgom       Characidium gomesi          Travassos, 1956          0
Cmod       Cyphocharax modestus        (Fernandez-Yepez,        0
                                         1948)
Plin       Prochilodus lineatus        (Valenciennes, 1836)     0
Hequ       Hyphessobrycon eques        (Steindachner, 1882)     0
Hypsp2     Hypostomus sp.2                                      1
Bryc       Bryconamericus sp.                                   1
Hmal       Hoplias cf. malabaricus     (Bloch, 1794)            1
Cgob       Cetopsis gobioides          Kner, 1858               0
Hypsp3     Hypostomus sp.3                                      0
Caen       Corydoras aeneus            (Gill, 1858)             0
Sspi       Serrasalmus maculatus       Kner, 1858               0
Pbri       Planaltina britski          Menezes, Weitzman &      0
                                         Burns, 2003
Loct       Leporinus octofasciatus     Steindachner, 1915       0
Lpir       Loricaria cf. piracicabae   Ihering, 1907            0
Cvan       Cyphocharax vanderi         (Britski, 1980)          0
Lvit       Leporellus vittatus         (Valenciennes, 1850)     0
Trichsp2   Trichomycterus sp.2                                  0
Cjag       Crenicichla jaguarensis     Haseman, 1911            0
Hyph       Hyphessobrycon sp.                                   0
Smar       Synbranchus marmoratus      Haseman, 1911            0
Hlit       Hoplosternum littorale      (Hancock, 1828)          0
Aden       Aphyocharax dentatus        Eigennmann & Kennedy,    1
                                         1903

                                       Total                   368

Code                Species                 Descriptor         P5

Czeb       Characidium aff. zebra      (Eigenmann, 1909)       10
Pcau       Phalloceros harpagus        Lucinda, 2008            3
Astysp1    Astyanax sp.1                                       46
Hstri      Hypostomus strigaticeps     (Regan, 1908)           115
Trichsp1   Trichomycterus sp.1                                  0
Bstr       Bryconamericus stramineus   Eigenmann, 1908          1
Omic       Odontostilbe aff.           Eigenmann, 1907         105
             microcephala
Imir       Imparfinis mirini           Hasemann, 1911           4
Btur       Bryconamericus turiuba      Langeani, de             0
                                         Lucena, Pedrini &
                                         Tarelho-Pereira,
                                         2005
Apar       Astyanax scabripinnis       Eigenmann, 1914          0
             paranae
Cihe       Cetopsorhamdia iheringi     Schubart & Gomes,        0
                                         1959
Ccue       Corumbataia cuestae         Britski, 1997            0
Aalt       Astyanax altiparanae        Garutti & Britskii,     71
                                         2000
Aibi       Apareiodon ibitiensis       Amaral Campos, 1944      0
Pnas       Parodon nasus               Kner, 1859               2
Aboc       Astyanax bockmanni          Vari & Castro, 2007      2
Cfla       Corydoras flaveolus         Ihering, 1911           12
Imbor      Imparfinis borodini         Mees & Cala, 1989        0
Parg       Piabina argentea            Reinhardt, 1867          0
Rque       Rhamdia quelen              (Quoy & Gaimard,         6
                                         1824)
Hanc       Hypostomus ancistroides     (Ihering, 1911)         20
Hypsp1     Hypostomus sp.1                                     12
Gbra       Geophagus brasiliensis      Kner, 1865               2
Afas       Astyanax fasciatus          (Cuvier, 1819)          13
Aaff       Apareiodon affinis          (Steindachner, 1879)     9
Rlat       Rineloricaria latirostis    (Boulenger, 1900)        5
Hison      Hisonotus sp.                                        0
Pimesp1    Pimelodella sp.1                                    12
Ains       Steidachnerina              (Fernandez-Yepez,       10
             insculpita                  1948)
Hher       Hypostomus cf. hermanni     (Ihering, 1905)          0
Neop       Neoplecostomus sp.                                   0
Microg     Microglanis cf.                                      0
           garavelloi

Lfri       Leporinus friderici         (Bloch, 1794)            5
Gcar       Gymnotus cf. carapo         Linnaeus, 1758           0
Hins       Hisonotus insperatus        Britski & Garavello,     0
                                       2003

Pret       Poecilia reticulata         Peters, 1859             0
Evir       Eigenmannia virescens       (Valenciennes, 1836)     0
Isch       Imparfinis schubarti        (Gomes, 1956)            0
Lstr       Leporinus striatus          Kner, 1858               4
Cgom       Characidium gomesi          Travassos, 1956          0
Cmod       Cyphocharax modestus        (Fernandez-Yepez,        3
                                         1948)
Plin       Prochilodus lineatus        (Valenciennes, 1836)     0
Hequ       Hyphessobrycon eques        (Steindachner, 1882)     0
Hypsp2     Hypostomus sp.2                                      2
Bryc       Bryconamericus sp.                                   0
Hmal       Hoplias cf. malabaricus     (Bloch, 1794)            1
Cgob       Cetopsis gobioides          Kner, 1858               0
Hypsp3     Hypostomus sp.3                                      0
Caen       Corydoras aeneus            (Gill, 1858)             1
Sspi       Serrasalmus maculatus       Kner, 1858               2
Pbri       Planaltina britski          Menezes, Weitzman &      2
                                         Burns, 2003
Loct       Leporinus octofasciatus     Steindachner, 1915       2
Lpir       Loricaria cf. piracicabae   Ihering, 1907            1
Cvan       Cyphocharax vanderi         (Britski, 1980)          0
Lvit       Leporellus vittatus         (Valenciennes, 1850)     0
Trichsp2   Trichomycterus sp.2                                  1
Cjag       Crenicichla jaguarensis     Haseman, 1911            1
Hyph       Hyphessobrycon sp.                                   1
Smar       Synbranchus marmoratus      Haseman, 1911            1
Hlit       Hoplosternum littorale      (Hancock, 1828)          1
Aden       Aphyocharax dentatus        Eigennmann & Kennedy,    0
                                         1903

                                       Total                   488

Code                Species                 Descriptor         Total

Czeb       Characidium aff. zebra      (Eigenmann, 1909)        933
Pcau       Phalloceros harpagus        Lucinda, 2008            579
Astysp1    Astyanax sp.1                                        373
Hstri      Hypostomus strigaticeps     (Regan, 1908)            360
Trichsp1   Trichomycterus sp.1                                  343
Bstr       Bryconamericus stramineus   Eigenmann, 1908          268
Omic       Odontostilbe aff.           Eigenmann, 1907          248
             microcephala
Imir       Imparfinis mirini           Hasemann, 1911           231
Btur       Bryconamericus turiuba      Langeani, de             191
                                         Lucena, Pedrini &
                                         Tarelho-Pereira,
                                         2005
Apar       Astyanax scabripinnis       Eigenmann, 1914          186
             paranae
Cihe       Cetopsorhamdia iheringi     Schubart & Gomes,        174
                                         1959
Ccue       Corumbataia cuestae         Britski, 1997            158
Aalt       Astyanax altiparanae        Garutti & Britskii,      158
                                         2000
Aibi       Apareiodon ibitiensis       Amaral Campos, 1944      110
Pnas       Parodon nasus               Kner, 1859               98
Aboc       Astyanax bockmanni          Vari & Castro, 2007      85
Cfla       Corydoras flaveolus         Ihering, 1911            73
Imbor      Imparfinis borodini         Mees & Cala, 1989        69
Parg       Piabina argentea            Reinhardt, 1867          56
Rque       Rhamdia quelen              (Quoy & Gaimard,         54
                                         1824)
Hanc       Hypostomus ancistroides     (Ihering, 1911)          49
Hypsp1     Hypostomus sp.1                                      47
Gbra       Geophagus brasiliensis      Kner, 1865               32
Afas       Astyanax fasciatus          (Cuvier, 1819)           24
Aaff       Apareiodon affinis          (Steindachner, 1879)     20
Rlat       Rineloricaria latirostis    (Boulenger, 1900)        18
Hison      Hisonotus sp.                                        17
Pimesp1    Pimelodella sp.1                                     13
Ains       Steidachnerina              (Fernandez-Yepez,        12
             insculpita                  1948)
Hher       Hypostomus cf. hermanni     (Ihering, 1905)          10
Neop       Neoplecostomus sp.                                   10
Microg     Microglanis cf.                                       7
             garavelloi
Lfri       Leporinus friderici         (Bloch, 1794)             6
Gcar       Gymnotus cf. carapo         Linnaeus, 1758            6
Hins       Hisonotus insperatus        Britski & Garavello,      5
                                         2003
Pret       Poecilia reticulata         Peters, 1859              5
Evir       Eigenmannia virescens       (Valenciennes, 1836)      5
Isch       Imparfinis schubarti        (Gomes, 1956)             4
Lstr       Leporinus striatus          Kner, 1858                4
Cgom       Characidium gomesi          Travassos, 1956           4
Cmod       Cyphocharax modestus        (Fernandez-Yepez,         3
                                         1948)
Plin       Prochilodus lineatus        (Valenciennes, 1836)      3
Hequ       Hyphessobrycon eques        (Steindachner, 1882)      3
Hypsp2     Hypostomus sp.2                                       3
Bryc       Bryconamericus sp.                                    2
Hmal       Hoplias cf. malabaricus     (Bloch, 1794)             2
Cgob       Cetopsis gobioides          Kner, 1858                2
Hypsp3     Hypostomus sp.3                                       2
Caen       Corydoras aeneus            (Gill, 1858)              2
Sspi       Serrasalmus maculatus       Kner, 1858                2
Pbri       Planaltina britski          Menezes, Weitzman &       2
                                         Burns, 2003
Loct       Leporinus octofasciatus     Steindachner, 1915        2
Lpir       Loricaria cf. piracicabae   Ihering, 1907
Cvan       Cyphocharax vanderi         (Britski, 1980)
Lvit       Leporellus vittatus         (Valenciennes, 1850)
Trichsp2   Trichomycterus sp.2
Cjag       Crenicichla jaguarensis     Haseman, 1911
Hyph       Hyphessobrycon sp.
Smar       Synbranchus marmoratus      Haseman, 1911
Hlit       Hoplosternum littorale      (Hancock, 1828)
Aden       Aphyocharax dentatus        Eigennmann & Kennedy,
                                         1903

                                       Total                   5082

Table 3. Number of individuals (N), richness (S) and
indices of Shannon's diversity (H), Margalef's richness
(MG) and Pielou's evenness (J) for each sample site,
considering the different fishery equipment used
electric fishery equipment (P1, P2 and P3) and nets
(P3, P4 and P5).

                         N      S      H    MG     J

Eletric fishery   P1   119.0   8.7    1.5   1.6   0.7
                  P2   133.3   12.7   1.9   2.4   0.8
                  P3   167.7   20.2   2.5   3.7   0.8
Gill nets         P3   59.5    13.7   2.0   3.2   0.8
                  P4   24.0    7.7    1.7   2.2   0.9
                  P5   22.0    8.0    1.8   2.3   0.9

Table 4. Table ANOVA for indices of Margalef's richness, Shannon's
diversity and Pielou's evenness separately considering the catch
with electric fishery (1, 2 and 3) and nets (3, 4 and 5).

                          Eletric fishery (sites 1, 2 and 3)

                   FV     df     SQ      QM       F        p

Margalef's        Local   2    12.58    6.29    23.49   < 0.001
richness index    Error   15   40.169   2.68

Shannon's         Local   2     2.12    1.06    35.04   < 0.001
diversity index   Error   15    0.45    0.03

Pielou's          Local   2     0.03    0.015   10.01    0.001
evenness index    Error   15   0.022    0.001

                       Gill nets (sites 3, 4 and 5)

                  df    SQ      QM      F       p

Margalef's        2    35.17   17.58   3.78   0.047
richness index    15   69.66   4.64

Shannon's         2    0.76    0.38    3.12   0.073
diversity index   15   1.83    0.12

Pielou's          2    0.01    0.005   0.51   0.612
evenness index    15   0.151   0.01

FV) Sorce of variation; df) Degrees of freedom; SQ) Sum of squares;
QM) Mean square, F) F statistic, p) Probability value.
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Title Annotation:ECOLOGY
Author:Carmassi, A.L.; Rondineli, G.; Ferreira, F.C.; Braga, F.M.S.
Publication:Brazilian Journal of Biology
Date:Feb 1, 2012
Words:6695
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