Freshwater prawns of the genus Macrobrachium (Decapoda: Palaemonidae) from the San Pedro-Mezquital River, Nayarit, Mexico.
In January, February, May 2009 and from July to September of 2012 several localities of the San PedroMezquital River, Nayarit, were visited between 08:00 AM and 18:00 PM (Fig. 1). The sampling sites of higher altitude and away from the coast were San Blasito with more than 220 m, Piedra Bola 170 m, Cortina 150 m, Naranjo 103 m, Venado 50 m, Ruiz 27 m, San Pedro 16 m and Tuxpan 10 m. In each site was recorded depth and transparency with Secchi disc. As well as temperature, dissolved oxygen, pH and conductivity using a YSI model 85 multiparameter device, YSI model 55 oximeter and Hatch potentiometer. It was estimated the stream flow and velocity in a section near the Venado and San Pedro in March 2009, uses a float (an object such as an orange, ping-pong ball, pine cone, etc.) to measure stream velocity. Calculating flow involves solving an equation that examines the relationship among several variables including stream cross-sectional area, stream length, and water velocity (US EPA, 1997).
The prawns were collected using aquatic net, surber net and minnow seines at each site along the river and rocks, boulders, pebbles, sands, aquatic vegetation, trunks, branches and litter were removed. The specimens were separated and preserved in 70% ethanol, tagged with the collection data and geographic position with a GPS. In the laboratory shrimps were identified at the genus and species level, with the support of Holthuis (1952), Nates & Villalobos (1990) and Hernandez et al. (2007). To determine the relationship of the environmental variables with the richness of species and their abundance the Pearson correlation coefficient was used.
The number of individuals collected in the seven visits to the sampling sites was 802 (Table 1). The prawns were found under branches, trunks, roots or rocks of various sizes and sediments from coarse to fine, as well as in fast and slow current, typical places of the lotic ecosystem, in these decapods (Hendrickx, 1995). The presence of six species of freshwater prawns is reported for the first time in the San Pedro-Mezquital River basin: Macrobrachium americanum (Bate, 1868), M. occidentale (Holthius, 1950), M. digueti (Bouvier, 1895), M. michoacanus (Nates-Rodriguez & VillalobosHiriart, 1990), M. hobbsi (Nates & Villalobos, 1990) and M. tenellum (Smith, 1871) (Table 1). The six species recorded are described:
Macrobrachium americanum (Bate, 1868)
Local common name: cauque, chacal, endoco. Habitat. In the clear waters of the San Pedro-Mezquital River. They are distributed in logs, under rocky areas, inside caves that form the water and in some cases immersed in the vegetation adjacent. We found this species cooccurring with M. occidentale. Material examined: The total length on male and female specimens collected was 222.2 mm max. and 84.13 mm min. Cephalothorax length was 79.60 mm max. and 29.17 mm min.
Macrobrachium occidentale (Holthius, 1950)
Local common name: langostino, cauque. Cooccurring with M. americanum. The total length on male and female specimens collected was 109.63 mm max. and 41.45 mm min. Cephalothorax length was 43.12 mm max. and 15.19 mm min.
Macrobrachium digueti (Bouvier, 1895)
Local common name: langostino. The total length on male and female specimens collected was 81.86 mm max. and 50.56 mm min. Cephalothorax length was 30.08 mm max. and 21.87 mm min.
Macrobrachium michoacanus (Nates & Villalobos, 1990)
Local common name: cauque, langostino. Cooccurring with M. hobbsi and M. tenellum. Material examined: the total length on male and female specimens collected was 74.27 mm max. and 33.88 mm min. Cephalothorax length was 26.49 mm max. and 13.49 mm min.
Macrobrachium hobbsi (Nates & Villalobos, 1990)
Local common name: langostino. They inhabit areas of running water in adjacent vegetation on the river. Cooccurring with M. tenellum and M. michoacanus. Material examined: the total length on male and female specimens collected was 58.41 mm max. and 54.33 mm min. Cephalothorax length was 22.16 mm max. and 18.54 mm min.
Macrobrachium tenellum (Smith, 1871)
Local common name: manopalito, chacalin, manudo, manocarrizo, langostino. Habitat: they inhabit areas of running water in adjacent vegetation on the river; although in a lentic environment, such as pools, they live in stagnant water with large amounts of deposited organic material, with low dissolved oxygen gradients and very variable conditions of temperature and salinity (Guzman & Kensler, 1977). Co-occurring with M. hobbsi and M. michoacanus. Material examined: The total length on male and female specimens collected was 90.41 mm max. and 44.74 mm min. Cephalothorax length was 36.75 mm max. and 17.26 mm min.
A similar number of prawns have been reported towards the northwest of this river, in the peninsula of Baja California (Hernandez et al., 2007), and to the southeast, on the coast of Oaxaca (Villalobos et al., 2010), and the possibility of the presence of other prawns M. acanthochirus (Villalobos-Figueroa, 1967) and M. olfersi (Wiegmann, 1836) in rivers that discharge in the Mexican Pacific (Villalobos, 1982; Villalobos-Hiriart et al., 1992; Hernandez et al., 2007; Villalobos-Hiriart et al., 2010). The highest richness was recorded in Venado with six species, Ruiz and San Pedro recorded five species respectively. This result is similar to that reported by Villalobos-Hiriart et al. (2010) in rivers of Oaxaca, finding most of the species towards the middle and low (coastal plain) of the rivers studied. In addition, these three localities accumulate about 70% of the abundance relative of registered prawns. M. americanum andM. occidentale were found in San Blasito, at an altitude of 220 m and 70 km upstream from Tuxpan, a locality with the closest at Marismas Nacionales, of lower altitude (10 masl), where it was found only to M. tenellum. The difference in species richness between localities may be related to the sampling intensity, since San Blasito and Piedra bola were visited in only one occasion (May 2009), while the rest of the sites were visited in more occasions. Piedra Bola only recorded the presence of a male ofM. americanum. From Tuxpan locality the river changes in geomorphology with predominance of soft substrate consisting mainly of sands and silts, with a minimum slope, and therefore in rainy season tends to present floods, communicating with south of protected natural area Marismas Nacionales, by diverse streams and channels, where M. tenellum was the only prawn present and abundant. M. occidentale was the most frequent shrimp in the river, present in six of the eight localities, followed by M. digueti in five localities and the rest of the species were registered in the localities of the lower part of the river, Venado, Ruiz, San Pedro and Tuxpan. The sex ratio for the total population of shrimp caught was equal to 1:1. The ovigerous females represented only 6.6% of the total of prawns captured, in which M. digueti and M. hobbsi showed the highest number of ovigeras, with 17 females respectively, followed by M. michoacanus (10). Juveniles recorded above 35% of the abundance, indicating an active and continuous recruitment among the shrimp towards the lower part of the river basin, as evidenced by the localities of Ruiz, San Pedro and Tuxpan. The highest localities (>100 m) did not register juveniles, except in Naranjo (103 m) with a single individual. Like juvenile shrimp, ovigera females are almost entirely present in the localities of the lower part of the river basin, in preparation for migration to brackish waters and completing the reproductive cycle, as in these orga nisms (Bauer, 2011). These females were registered mainly in the months of June to September in the localities of the lower part of the river. However, M. occidentale recorded an ovigera female in May in San Blasito, with more than 200 m of altitude. The reproductive period in these organisms is related to the rainy season (New & Valenti, 2000), but change, depending on the region, in this case this event was recorded in spring and summer.
The environmental conditions recorded in the water column of the San Pedro-Mezquital River during the months and sampling sites are the minimum necessary for the presence and adequate development of aquatic fauna of the lotic system. No significant variations were found in the physical and chemical parameters of the water recorded during the study period. The fluctuations of temperature, dissolved oxygen and pH were in favorable ranges to perform the processes of osmo-regulation, thermoregulation and oxygen circulation in the gill chamber. The Table 2 summarizes the values of recorded variables. The temperature was 22.3 and 30.1[degrees]C in the dry season (average: 26.6[degrees]C [+ or -] 1.7) and in the rainy season it ranged from 26.4 to 32.6[degrees]C (average: 28 [+ or -] 2.9[degrees]C). Dissolved oxygen had a mean value above 6.32 mg [L.sup.-1], the minimum concentration required for the life of the aquatic fauna in the river during the sampling dates. Likewise, the pH remained slightly neutral with an average of 7.4 [+ or -] 0.81 in the dry season and 7.2 [+ or -] 0.28 during the months of maximum humidity (rainy season). In terms of conductivity, in May 2009 was around 300 [micro]s [cm.sup.-1] and in the rainy season decreased to an average of 170 [micro]s cm-1. In Venado site the stream flow of 18 m3 s-1 and velocity of 0.6 m s-1 in March 2009 (dry season), while at San Pedro was the same velocity (0.6 m s-1) and stream flow at 22 m3 s-1; it is suggested that in the rainy season the stream velocity should reach 1.6 m s-1 and a stream flow rate of 122 and 123 m3 s-1 respectively. It is characteristic that the runoff that incorporates solids to the channels in rainy season, with the consequent increase of nutrients.
With the recording of environmental and biological variables collected, a correlation analysis was performed and the level of dependence was determined on the presence of prawns and their abundance (Table 3); however, only the correlation between altitude and abundance (-0.446) were significant with a 99% confidence level. Thus, it is confirmed that the presence and abundance of Macrobrachium are found mainly in the coastal plain of this river, as it happens in some rivers of the coast of Oaxaca, Mexico (VillalobosHiriart et al., 2010).
The people of the rural communities in the river, including indigenous communities, actively capture the species of the freshwater shrimps and the various species of prawns are fed, mainly M. americanum, M. tenellum andM. occidentale, during certain times of the year, as in other regions of the Americas (Hendrickx, 1995).
Received: 1 March 2017; Accepted: 20 January 2018
We thank the people of the communities in the San Pedro-Mezquital River, Nayarit, who were always attentive to support us during the sampling. To Universidad de Guadalajara for the support of logistical and economic resources of the Project "Adecuacion de la Manifestacion de Impacto Ambiental Modalidad Regional (MIA-R) del Proyecto Hidroelectrico Las Cruces, en el estado de Nayarit de acuerdo con los lineamientos actuales de la Secretaria de Medio Ambiente y Recursos Naturales".
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Ernesto Lopez-Uriarte (1), Elva Guadalupe Robles-Jarero (1), Manuel Alejandro- Vargas Ceballos (2), Fernando Vega-Villasante (2)
(1) Laboratorio de Ecosistemas Marinos y Acuicultura, Departamento de Ecologia Centro Universitario de Ciencias Biologicas y Agropecuarias, Jalisco, Mexico
(2) Laboratorio de Acuicultura Experimental, Centro de Investigaciones Costeras Universidad de Guadalajara, Jalisco, Mexico
Corresponding author: Ernesto Lopez (email@example.com)
Caption: Figure 1. Map of sampling sites in the San Pedro-Mezquital River, Nayarit, Mexico.
Table 1. Freshwater prawns of the genus Macrobrachium in the San Pedro-Mezquital River. [male] = male, [female] = female, [female]o = ovigerous female. Species San Blasito Piedra Bola 22[degrees]23'16.4"N 22[degrees]19'56.4"N 105[degrees]01'52.4"w 105[degrees]02'56.9"W M. americanum 1[male]: 1[male] 1[female] M. digueti M. michoacanus M. occidentale 3[male]: 4[female]: 1[female]o M. hobbsi M. tenellum Macrobrachium juveniles Species Cotina Naranjo 22[degrees]05'57.4"N 22[degrees]02'28.09"N 104[degrees]56'39.6"W 104[degrees]56'2.17"W M. americanum 4[male]: 1[female] M. digueti 1[male] 3[male]: 2[female] M. michoacanus 5[male] M. occidentale 2[male]: 9[male]: 2[female]o 2[female] M. hobbsi 1[male] M. tenellum Macrobrachium 1 juveniles Species Venado Ruiz 21[degrees]56'47.6"N 21[degrees]57'04.6"N 105[degrees]04'23.1"W 105[degrees]10'44.7"W M. americanum 6[male]: 2[female] M. digueti 9[male]: 9[male]: 5[female]:2o 2[female]: 1[female]o M. michoacanus 17[male]: 4[male] 1[female]: 10[female]o M. occidentale 14[male] 4[female]o M. hobbsi 3[male]: 4[male]: 2[female]: 2[female] 2[female]o M. tenellum 13[male]: 1[male]: 1[female]o Macrobrachium 10[female] 177 juveniles Species San Pedro Tuxpan 21[degrees]57'03.6"N 21[degrees]56'36.3"N 105[degrees]10'44.7"W 105[degrees]17'06.2"W M. americanum M. digueti 8[male]: 12[female]: 15[female]o M. michoacanus 15[male]: 7[female] M. occidentale 5[male] M. hobbsi 8[male]: 13[female]: 15[female]o M. tenellum 55[male]: 80[male]: 57[female] 42[female]: 1[female]o Macrobrachium 26 74 juveniles Species Abundance M. americanum 2.01 M. digueti 8.66 M. michoacanus 7.41 M. occidentale 5.77 M. hobbsi 6.28 M. tenellum 34.55 Macrobrachium 36.06 juveniles Table 2. Summary of water parameters and substrate type in 2009 and 2012 of the San Pedro-Mezquital River, depth (min- max in m), temperature (T[degrees]C), dissolved oxygen (DO), pH, conductivity (C), Secchi transparency (sT) and altitude (m). Substrate type Rock: r, boulder: b, pebbles: p, coarse sand: cs, medium sand: ms, fine sand: fs, limes: l, clays: cl, roots: rt, submerged vegetation: sv, emerged vegetation: ev. Date Locality Depth T[degrees]C DO pH (m) (mg [L. sup.-1]) Cortina 0.3-2 22.3 7.5 7.9 January Naranjo 0.2-3 24.6 6.8 7.6 2009 Venado 0.7 24.9 4.85 7.4 Ruiz 0.5 24.8 4.23 7.8 San Pedro 0.6 24.7 3.98 7.2 Naranjo -- 32.2 7.1 -- March Venado 0.2-1 26.6 7.9 -- 2009 Ruiz 0.2-0.5 28.2 8.4 -- San Pedro 0.2-1 29.6 8.1 -- Tuxpan 0.2-1 30.1 7.7 -- May San Blasito 0.5-1 23.7 9.3 7.2 2009 Piedra Bola 0.2-3 27.5 9.2 7.3 Cortina 29.9 4.56 8.18 June Naranjo 28.1 4.37 7.57 2009 Venado 29.9 4.55 8.02 San Pedro 32.1 6.14 8.05 Tuxpan 32.6 5.8 7.7 September Cortina 26.4 5.20 7.54 2009 Naranjo 26.5 3.99 7.68 Venado 26.7 5.0 7.72 San Pedro 27.1 6.55 7.7 Tuxpan 27.5 4.2 7.45 July Cortina 27.0 4.5 6.6 2012 Naranjo 29.1 6.65 6.69 Venado 26.4 7.9 6.73 Ruiz 27.2 6.2 6.8 San Pedro 28.2 7.9 6.7 Tuxpan 27.8 5.8 6.0 August Cortina 30.0 5.7 8.4 2012 Naranjo 30.3 5.4 9.6 Venado 30.5 7.2 7.84 Ruiz 27.3 6.2 6.61 San Pedro 30.4 8.2 8.13 Tuxpan 28.0 7.9 7.3 September Naranjo 29.1 6.5 6.7 2012 Venado 26.4 7.9 6.73 Ruiz 27.2 6.5 6.79 San Pedro 28.2 7.9 6.7 Tuxpan 28.2 5.8 6.0 Date Locality C sT Alti- Substate ([micro]s (m) tude and vegetation [cm.sup (m) .-1]) Cortina -- 0.3 150 r, b , p, cs, sv January Naranjo -- 0.20 103 b, p, cs, rt 2009 Venado 50 b, p, cs, ms, sv, rt Ruiz 27 b, p, cs, ms, sv, rt San Pedro 16 b, p, cs, ms, ev, sv Naranjo 339.5 0.25 103 March Venado 300.5 0.20 50 2009 Ruiz 299.7 0.15 27 San Pedro 313.6 0.20 16 Tuxpan 337.5 0.10 10 ms, fs, l, cl, rt, ev May San Blasito 358.8 0.5 220 r, b , p, cs, sv, rt 2009 Piedra Bola 333.9 0.5 170 r, b , p, cs, sv Cortina 229 0.10 150 June Naranjo 238 0.8 103 2009 Venado 228 50 San Pedro 274 0.8 16 Tuxpan 306 0.8 10 September Cortina 88.7 0.10 150 2009 Naranjo 94.8 -- 103 Venado 99.2 0.8 50 San Pedro 85.0 0.8 16 Tuxpan 77.2 0.10 10 July Cortina 0.4 150 2012 Naranjo 0.5 103 Venado 0.5 50 Ruiz 0.4 27 San Pedro 0.3 16 Tuxpan 0.1 10 August Cortina 0.1 150 2012 Naranjo 0.08 103 Venado 0.05 50 Ruiz 0.05 27 San Pedro 0.05 16 Tuxpan 0.05 10 September Naranjo 0.1 103 2012 Venado 0.1 50 Ruiz 0.08 27 San Pedro 0.05 16 Tuxpan 0.1 10 Table 3. Pearson correlation coefficient between environmental variables and species recorded in the San Pedro-Mezquital River. Parameter No P-value No P-value species organisms Temperature ([degrees]C) 0.007 >0.05 0.028 >0.05 Dissolved oxigen (mg -0.113 >0.05 0.112 >0.05 [L.sup.-1]) pH 0.164 >0.05 0.054 >0.05 Secchi transparency (m) 0.060 >0.05 -0.052 >0.05 Depth (m) 0.141 >0.05 -0.176 >0.05 Conductivity ([micro]s -0.024 >0.05 -0.046 >0.05 [cm.sup.-1]) Altitude (m) -0.013 >0.05 -0.449 <0.01
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|Title Annotation:||Short Communication|
|Author:||Lopez-Uriarte, Ernesto; Robles-Jarero, Elva Guadalupe; Alejandro-Vargas Ceballos, Manuel; Vega-Villa|
|Publication:||Latin American Journal of Aquatic Research|
|Date:||Jul 1, 2018|
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