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First record of Ceratium furcoides (Dinophyta), an invasive species, in a temporary high-altitude lake in the Iron Quadrangle (MG, Southeast Brazil)/Primeiro registro de Ceratium furcoides (Dinophyta), uma especie invasora, em um lago temporario de alta altitude no Quadrilatero Ferrifero (MG, Sudeste do Brasil).

1. Introduction

Around the world, natural communities and ecosystems are increasingly disturbed by the invasion of non-native species. Very few communities and ecosystems in the world have remained unaffected by exotic species (Heywood, 1989; Dzialowski et al., 2000). The majority of introduced species have little or no effect on native communities (Simberloff, 1996; Lodge, 1993; Williamson, 1996). However, some have a dramatic impact, causing deep changes in the structure of habitats, trophic interactions and population dynamics (Crooks, 2005). Furthermore, the species introduced tend to increase the similarity among the biota of different regions, a tendency widely observed on various geographic scales and affecting many kinds of organism (Vitousek et al., 1996; Lockwood and McKinney, 2001). If an introduced species becomes abundant in a new environment, evidencing its highly adaptive capacity, it may turn out to be invasive and lead to severe consequences for the ecosystem, the most prejudicial being the extinction of native species, caused mainly, by strong competition or predation (Baskin, 1994).

Natural ecosystems are particularly vulnerable to biological invasions, owing to many factors, including high degree of connectivity, strong spatial influence (horizontal and vertical), anthropogenic impact and high habitat heterogeneity, that increase the chance of species establishment (Simberloff, 1996). Dinoflagellates of Ceratium genus can be found in both marine and freshwater habitats. Bicudo and Menezes (2005) reported the occurrence of six species of this genus in continental water bodies around the world, found mainly in temperate areas (Wu and Chou 1998). These dinoflagellates have been already recorded in freshwaters from various regions of the world, including for Europe: Hungary (Padisak, 1985), Spain (Perez-Martinez and Sanchez-Castillo, 2001), Greece (Katsiapi et al., 2011), Britain (Lewis and Dodge, 2002; Whitton et al., 2003), Romania (Caraus, 2002) and Italy (Hansen and Flaim, 2007); in Asia: Taiwan (Wu and Chou, 1998), Japan (Carty, 2003) and India (Bhat et al., 2012); in Oceania: Australia (Whittington et al., 2000; Baldwin et al., 2003); in American continent: USA, Canada and Argentina (Mac Donagh et al., 2005, 2009) and in Africa: South Africa (Der Walt, 2011) and many shallow lakes (Ndebele-Murisa et al., 2010).

The first register of C. hirundinella in Brazilian freshwaters was made by Branco et al. (1963). Since then several records of the occurrence of this dinoflagellate in many Brazilian aquatic ecosystems were published (Santos-Wisniewski et al., 2007; Matsumura-Tundisi et al., 2010; Oliveira et al., 2011; Severiano et al., 2012; Silva et al., 2012. To our knowledge, this is the first time that the occurrence of Ceratium furcoides is reported in a high-altitude natural, shallow, temporary lake in Brazil.

2. Material and Methods

Plankton samples were collected in the months of October and November 2010 from a small temporary lake, named Lagoa Seca (Figure 1). Lagoa Seca is located in a small depression at 1,609 m above sea level, in Itacolomi State Park (PEIT), a Conservation Unit located between the towns of Ouro Preto and Mariana, in the southern portion of the Iron Quadrangle in Minas Gerais State (20[degrees] 22' 30"--20[degrees] 30' 00" S by 43[degrees] 32' 30"--43[degrees] 22' 30" W). The lake is formed by water springs and reaches a maximum depth of 1.5 m in the rainy season, drying out completely in the period between April and September, the local dry season.

Zooplankton samples were taken by filtering 90 L of water through a plankton net of 30 cm mouth diameter aperture and 68 pm mesh aperture. Samples were preserved in 4% formaldehyde solution. Ceratium furcoides was identified and its abundance was determined by counting subsamples in the Sedgwick-Rafter chamber under an optical microscope at 100 times magnification.

Ceratium furcoides cells were observed and photographed under an Olympus BX50 microscope (Figure 2). Cells were clarified with 20% NaClO solution for plate tabulation analysis. The taxonomical analysis was based on Popovsky and Pfiester (1990) and Steidinger and Tanger (1997) descriptions.

3. Results and Discussion

The individuals found in the samples measured 180-209 [micro]m in total length and 51-60 [micro]m in maximum width (Figure 2). C. furcoides is very similar to Ceratium hirundinella, the main distinctions being the difference in the apical plate tabulation: in C. hirundinella, 4 apical plates reach the apex, whereas in C. furcoides, which also has 4 apical plates, only 3 of them reach the apex (according description by Santos-Wisniewski et al., 2007).

These two species are spreading fast in many areas and it is important to be able to distinguish them readily to allow an accurate follow-up of their invasion route and speed. To facilitate the differentiation of these two species, their main diagnostic characteristics were presented in Figure 3 and described as follows:

Description

1. Ceratium furcoides (Levander) Langhans 1925 (Figures 3a and 3b)

Cells are narrowly fusiform in outline and strongly flattened dorsi-ventrally. The epivalve is narrowly conical; a long horn forms from just above the cingulum. The cingulum is slightly narrow. The body of the hypovalve is broad and short. It is formed by the antapical plates. On the epivalve of this species there are four apical plates, one of which, the 4' does not reach the apex.

Dimensions: 123-322 [micro]m X 28-42 (56) [micro]m.

Occurrence: According to the literature it occurs from oligotrophic to eutrophic lakes and reservoirs; It has been recorded in North and South America, Europe, Asia, Africa and Oceania.

2. Ceratium hirundinella (O. F. Muller) Dujardin 1841 (Figures 3c and 3d)

Cells are broadly or narrowly fusiform in outline, depending upon the degree of divergence of the horns. They are strongly flattened dorsiventrally. The helmet-shaped epivalve narrows from just above the cingulum gradually forming a long horn with 4 apical plates. The cingulum is slightly narrow. The body of the hypovalve is broad and short. It is divided into a varying number of posterior horns, usually 3, sometimes only 1. The central or median horn formed by the antapical plates is the longest. Plates are coarsely reticulate with fine spicules.

Dimensions: 40-450 [micro]m X 28-55 [micro]m,

Occurrence: Europe, North America, South America, Asia, Africa and Oceania.

Densities of C. furcoides in Lagoa Seca were very low, with a maximum of 4 ind [L.sup.-1] in the limnetic region in October. On this sampling day, only 2 ind [L.sup.-1] were recorded in the littoral region sample. Population densities in the November samples were 0.40 and 0.13 ind [L.sup.-1] for the limnetic and littoral regions, respectively. These values are very low compared to densities recorded in natural lakes and reservoirs in the South American continent. In the eutrophic La Quebrada Lake in Argentina, C. hirundinella densities surpassed 30,000 ind [L.sup.-1] (Periotto et al., 2007). In Southeastern Brazil, Matsumura-Tundisi et al. (2010) reported high densities of Ceratium furcoides in the eutrophic Billings reservoir (25,000 ind [L.sup.-1]), while Silva et al. (2012) recorded a maximum density of 28,564 ind [L.sup.-1] in the mesotrophic Furnas Reservoir in Minas Gerais State.

The low density of C. furcoides in Lagoa Seca may also be related to the disturbances caused by the great water-level changes and drying up of this temporary pool. Lopez et al. (2012), highlights the influence of hydraulic dynamics as one of the primary factors determining the structural and temporal changes in phytoplankton communities in tropical high-mountain reservoirs, regardless of the nutrient concentration. Lagoa Seca is an oligotrophic ecosystem (Eskinazi-Sant'Anna et al., 2011), and the reservoirs where high densities of C. furcoides were found are all mesotrophic, eutrophic or hypereutrophic (Wu and Chou, 1998; Matsumura-Tundisi et al., 2010; Bustamante-Gil et al., 2012). According to Andrade et al. (2012), the soils of the Itacolomi State Park are extremely rich in organic matter, but with low availability of nutrients. The availability of P in the soil can be considered low to moderate (1.2 a 4.1 mg [dm.sup.-3]), probably related to high soil acidity (Terror et al., 2011). The high altitude of the area and its low temperatures, associated with the low soil pH contribute to the slow process of decomposition of organic matter, favoring the production of humic substances, which can sustain primary productivity in oligotrophic aquatic ecosystems (Daniel et al., 2005). All these conditions can explain the occurrence of the mixotrophic C. furcoides in Lagoa Seca.

The occurrence of C. furcoides in a temporary lake at high-altitude (> 1500m) draws attention to the invasive potential of exotic species and the vulnerability of unique mountain aquatic biota to biological invasions. Cyst-forming freshwater dinoflagellates seem to be geographically widespread and some species are found on several continents. One reason given for this wide geographic distribution is their ready dispersion via such anabiotic reproduction structures (Mertens et al., 2012).

Resting cysts are more resistant to harsh conditions such as drought and temperature change than the flagellated cells. Passive dispersal of cysts allows species to colonize new habitats and to extend their ranges. Moreover, along the shorelines of lakes, fragments of scum and foam, with their contents of algae, can be picked up by the wind and carried aloft. Algae can also be transported into the air by thermal winds, often after heavy rainfall, when algae have been splashed up by raindrops (Kristiansen, 1996). Thus, the concentrations of algae in the air are very dependent on meteorological conditions, including strong winds and rain, both of which are very common in the mountain region of the Iron Quadrangle. Mountain lakes are therefore highly vulnerable to aerial deposition of particles and drops and what they carry, making them important historical records not only of the extent of the impact of human activities, but also that of the broad global connections that facilitate the dispersion and introduction of species (Camarero et al., 2009).

Further information regarding the colonization of and full C. furcoides establishment in pristine tropical water bodies are not available and would be valuable for a better understanding of the dynamics of the invasion process as a whole.

http://dx.doi.org/10.1590/1519-6984.08013

Acknowledgements

To the Federal University of Ouro Preto (UFOP) for infrastructure facilities and FAPEMIG for financial support of the project (CRA--APQ-01767-11).

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Moreira, RA. (a) *, Rocha, O. (a), Santos, RM. (a), Laudares-Silva, R. (b), Dias, ES. (c) and Eskinazi-Sant'Anna, EM. (c)

(a) Programa de Pos-Graduacao em Ecologia e Recursos Naturais, Universidade Federal de Sao Carlos--UFSCar, Rodovia Washington Luiz, Km 235, s/n, Bairro Monjolinho, CP 676, CEP 13565-905, Sao Carlos, SP, Brazil

(b) Departamento de Botanica, Universidade Federal de Santa Catarina--UFSC, Campus Universitario, s/n, Trindade, CP 476, CEP 88040-900, Florianopolis, SC, Brazil

(c) Laboratorio de Ecologia Aquatica, Departamento de Biodiversidade, Evolucao e Meio Ambiente, Universidade Federal de Ouro Preto--UFOP, Campus Morro do Cruzeiro, s/n, Bauxita, CEP 35400-000, Ouro Preto, MG, Brazil

* e-mail: raquel.moreira87@yahoo.com.br

Received: May 22, 2013--Accepted: October 7, 2013--Distributed: March 31, 2015 (With 3 figures)
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Title Annotation:Original Article
Author:Moreira, R.A.; Rocha, O.; Santos, R.M.; Laudares-Silva, R.; Dias, E.S.; Eskinazi-Sant'Anna, E.M.
Publication:Brazilian Journal of Biology
Date:Jan 1, 2015
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