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Brazilian Journal of Biology

versión impresa ISSN 1519-6984

Braz. J. Biol. vol.72 no.2 São Carlos mayo 2012

http://dx.doi.org/10.1590/S1519-69842012000200004 

ECOLOGY

 

Environmental influences on the composition and structure of the freshwater mussels in shallow lakes in the Cuiabá River floodplain

 

Influências ambientais na composição e estrutura de bivalves em lagoas da planície de inundação do rio Cuiabá

 

 

Colle, AC.I; Callil, CT.II, *

IPrograma de Pós-graduação em Ecologia e Conservação da Biodiversidade, Instituto de Biociências, Universidade Federal de Mato Grosso - UFMT, Av. Fernando Corrêa da Costa, 2367, Boa Esperança, CEP 78060-900, Cuiabá, MT, Brazil
IIDepartamento de Biologia e Zoologia, Instituto de Biociências, Universidade Federal de Mato Grosso - UFMT, Av. Fernando Corrêa da Costa, 2367, Boa Esperança, CEP 78060-900, Cuiabá, MT, Brazil

 

 


ABSTRACT

The maintenance of the freshwater mussels' community in lakes is determined by abiotic factors at the local scale and at regional scale by interspecific relations between the larvae of bivalves and fish host. Whereas the distribution pattern at local scale, our goal was to understand the abundance and community composition of bivalves and relate the environmental agents structuring this community. We sampled 20 lakes in the floodplain of the Cuiabá River using a standardized method of sampling. To evaluate the effect of environment on the community we applied multivariate inferential analyses. We found 1.143 individuals alive belonging into six species distributed at the family Hyriidae, Mycetopodidae, Sphaeridae and Corbiculidae. The results showed that in the Pantanal the bivalve assemblage structure is influenced locally by organic matter and particle size, variables that reflect the intense interactions between water-sediment. However it is important to emphasize that these environmental characteristics are the result of the dynamics of this system which is dependent on the flood pulse, a regional factor.

Keywords: mussels, species richness, environmental variables, marginal lagoons, Pantanal.


RESUMO

A manutenção da comunidade de bivalves límnicos em lagos é determinada por fatores abióticos em escala local e em escala regional pelas relações interespecíficas entre as larvas do bivalve e o peixe hospedeiro. Considerando o padrão de distiribuição em escala local, nosso objetivo foi conhecer a abundância e a composição da comunidade de bivalves e relacionar os agentes de estruturação desta comunidade. Foram amostrados 20 lagos na planície de inundação do rio Cuiabá usando método padronizado de amostragem. Para avaliar o efeito dos fatores abióticos sobre a comunidade aplicamos análises multivariadas inferenciais. Encontramos 1.143 indivíduos vivos, distribuidos em seis espécies pertencentes às famílias Hyriidae, Mycetopodidae, Sphaeridae e Corbiculidae. Os resultados demonstraram que no Pantanal, a estrutura da assembléia de bivalves é influenciada localmente pela matéria orgânica e granulometria, variáveis que refletem as intensas interações entre água-sedimento. No entanto é importante ressaltar que tais características ambientais são resultantes da dinâmica deste sistema o qual é dependente do pulso de inundação periódico, um fator de escala regional.

Palavras-chave: Bivalvia, riqueza de espécies, variáveis ambientais, lagoas marginais, Pantanal.


 

 

1. Introduction

Undoubtedly, freshwater mussels (Bivalvia, Unionoida) are a key component of aquatic ecosystem (Meador et al., 2011). These large invertebrates can be considered metabolic reactors because they transfer nutrients and energy from water to sediments by filtering, biodeposition of feces and pseudofeces, nutrient mineralization (Spooner and Vaughn, 2006) stimulating the production across trophic levels (Vaughn et al., 2009).

The Unionoida has a complex life cycle in which the larvae are generally temporary parasites of fish (Mansur, 1999; Dillon, 2000). After a period of being encysted in the host tissue, the juveniles descend to the substratum and begin the benthic and sedentary phase of their life. This cycle may have major implications in the distribution and abundance of bivalves as their colonization is initially completely dependent on the dispersion of the host fish - a regional process, but their growth and distribution may be determined by local conditions and processes (Vaughn and Taylor, 2000).

The spatial heterogeneity shown by plant and animal assemblages usually has multiple origins (Vaungh et al., 2008). Two classical models are found in the literature (May, 1984): the environmental control model, whereby the environmental variables are considered responsible for the variations observed in the presence and abundance of organisms (Whittaker, 1956; Bray and Curtis, 1957) and the biotic control model, whereby the connections between the organisms, horizontal (competition: Connell, 1983; Schoener, 1983) or vertical (predation: Mech, 1981; Langeland, 1982; Reinertsen et al., 1986), are considered primary factors in structuring assemblages.

Some authors cite the substratum as the variable that explains the abundance and local distribution of bivalves in lotic environments (van der Schalie, 1938; Strayer, 1993; Layzer and Madison, 1995; McRae et al., 2004). Often, the percentages of sand, silt and clay fractions are more efficient explanatory variables than the physical and chemical variables traditionally used by limnologists interested in the distribution of benthic macroinvertebrates (Ward, 1992). From this standpoint, the substratum would be responsible for the availability of habitats and microhabitats (on a scale of individuals), food (directly or absorbed in sediment particles), and protection (e.g., from water currents and predators). The variables of ecological importance in the substratum include the physical structure (granulometric composition), organic content, stability and heterogeneity (Callisto and Esteves, 1996). Factors such as dissolved oxygen, hydrogen potential (pH) (McMahon, 1991), water conductivity and hydroperiod (Maltchik et al., 2010) may also be involved in the distribution of bivalves. The limitation of many bivalves to shallow habitats, when in lentic waters, is related to their low tolerance to hypoxia (Burky, 1983).

Few systems provide the independent replicate sampling required to test what factors underlie mussel's distribution even at a regional level (Krebs et al., 2010). Considering the ecosystem function is a product of the expression of species functional traits and despite the various attributes of freshwater benthic bivalves, little is known about the composition and ecology of this group in Neotropical environments. Therefore, our objectives were: i) to determine the abundance and composition of benthic bivalves in the floodplain of the Cuiabá River, and ii) to identify the factors responsible for the structure of the bivalves' assemblages in these sites. Based on a literature review and the ecological requirements of benthic bivalves, our hypothesis is that the structure of the freshwater mussels in the shallow lakes of the floodplain is generated by the synergistic effect of the organic matter and the size of the particles that make up the sediment.

 

2. Material and Methods

The Pantanal is a large wetland of about 160.000 km2 in the center of the South American continent (Junk and Cunha, 2005). This region is situated in the Upper Paraguay River Basin in the central part of South America between 16° and 22° S latitude and 55° and 58° W longitude, stretching over part of Brazil, Paraguay and Bolivia (Da Silva et al., 2001). Its rich aquatic and terrestrial biota is adapted to the region's characteristic system of drought and flooding (Harris et al., 2005; Junk et al., 2006). For the Pantanal's aquatic environments, generalizations can be made about the dominant role of river waters in determining the seasons of the ecological processes, reflecting on the structure, metabolism and productivity of the systems, as is already recognized for other flood systems (Junk et al., 1989; Neiff, 1990).

The area of this study, located in the northern part of the Mato Grosso Pantanal, encompasses the municipalities of Nossa Senhora do Livramento, Santo Antônio de Leverger, Barão de Melgaço and Poconé. We collected samples from 20 shallow lakes in a floodplain in the River Cuiabá (Figure 1). Scheffer (2004) defines shallow lakes as the environments in which water is frequently mixed and explains the functioning of these systems are determined by intense sediment-water interactions.

The collection of mussels, sediment and comparison of limnological variables occurred simultaneously with the sampling event. Each lake was sampled once during the dry season of 2006 (September-November) and 2007 (June and July) to make it easier to capture the bivalves. The environmental variables considered were: hydrogen potential (pH), electrical conductivity of water (µS.cm-1), and dissolved oxygen (%), which were measured using a YSI 556MPS multiprobe meter, water transparency, measured with a Secchi disk (cm). We collected samples of sediment in triplicate from each lake, using them to determine the granulometric composition and the percentage of organic matter in the sediment (Allen, 1989). To determine the granulometric composition, the samples from sampling points were oven-dried at 60 °C for 72 hours. Subsamples of the sediment with 200 g of dry weight were sifted through sieves with 2.0, 1.0, 0.25, 0.125, 0.063, and <0.063 mm mesh superimposed in a sieve shaker for 40 minutes. The material retained in each sieve was weighed on analytical scales and the granulometric percentages of the sediment were determined for each mesh size.

Concerning the collection of bivalves to characterize the assemblages, we located mussels when the lakes were low and there were clear waters, but when the lakes were a little deeper and/or had turbid waters, the shells were located by touch (hands and feet) (Gangloff and Feminella, 2007). Once located, they were collected by hand to a maximum depth of 1.60 m. Collection was standardized to 4 hours per collector in each shallow lake. Search time is the most common technique for collecting information about bivalve abundance and is the only technique that can be used to obtain estimates of the total species richness and to locate rare species (Strayer et al., 1997; Vaughn et al., 1997). We identified all the collected individuals according to the taxonomic level of species. After identifying them, we returned some of the specimens to the environment and deposited a voucher series in the Malacological Collection, José Juan Parodiz-MT at the Biodiversity Center of the Federal University of Mato Grosso (register numbers: JPPMT 536 to 592 and JPPMT 605 to 621).

To reduce the dimensionality of the limnological variables, organic matter and granulometric fractions of the sediment, we applied a Principal Components Analysis (PCA) using the Euclidean distance with the matrix standardized by the standard deviation (SYSTAT version 10.0). The data in this analysis were dissolved oxygen, pH, sediment organic matter, medium sand, fine sand, silt, clay and mud from the 20 sampled shallow lakes. We reduced the dimensionality of the composition of bivalve species by non-metric multidimensional scaling (MDS) using the PC-ORD program (version 4.0). We ordered the composition of the bivalve assemblage based on the species abundances (quantitative ordering) using the Bray-Curtis index as a measure of dissimilarity (Faith et al., 1987) on sample-standardized matrices. We used the axes resulting from the ordering that describe the composition of the community as dependent variables in the inferential test of the effect of the environmental variables. The inferential test was carried out using multivariate multiple regression.

 

3. Results

The lakes around the wetlands of the Cuiabá River are shallow (50-200 cm), and have turbid waters (20-120 cm of transparency) and practically neutral (Assoreada lake pH = 6.7) tending to slightly alkaline (Serragem lake pH = 8.1) and low electrical conductivity (10 to 140 µS.cm-1). The sediments are predominantly fine and organic. Seventeen out of the twenty lakes sampled have 80% fine sand, silt and clay in texture.

We found 1143 live bivalves belonging to six species, distributed among four families: Hyriidae - Castalia inflata (Lamarck, 1819), Mycetopodidae - Anodontites elongatus (Swainson, 1823), Anodontites trapesialis (Lamarck, 1819), Mycetopoda siliquosa (Spix, 1827), Sphaeridae - Pisidium sterkianum (Pilsbry, 1897) and the exotic species Corbicula fluminea (Müller, 1774). The three most abundant species, C. inflata, A. elongatus and A. trapesialis, corresponded to 59.05, 16.97 and 16.53%, respectively of the live bivalves found in the lakes. These species were also the most frequent ones occurring, respectively, in 90, 70 and 50% of the lakes (Table 1).

The first two axes of the PCA corresponded to 63% of the variation in the limnological data (Table 2). The first axis explained 38% of the original variation of the data and was positively related with organic matter, medium sand and mud and negatively related with silt. The second component represented 25% of the variation in the data. Fine sand and dissolved oxygen were the main variables responsible for the formation of this axis. From this analysis, three distinct groups of environments could be observed (Figure 2). The first and largest group was characterized by the presence of silt and clay in nine of the twenty lakes sampled. Another group was defined by pH, dissolved oxygen and fine sand in the Sinhá Mariana, Serragem, Fartura and Arraial lakes. Organic matter and mud were the main variables that characterize the Santa Rosa, Barco Velho and Baía do Meio lakes. The Embauval, Moquém, Fazenda and Baía Assoreada lakes did not have characteristics common to the groups described.

 

 

The composition of the bivalve assemblages was represented by two MDS axes (stress 0.08). The multivariate multiple regression indicated that the bivalve assemblages were significantly correlated with organic matter, medium sand, mud and silt (the main variables forming axis 1), represented by the first PCA axis (Pillai Trace = 0.448, F2,16 = 6.486, p = 0.009). However, there was no significant correlation with the variables of fine sand and dissolved oxygen, represented by the second PCA component (Pillai Trace = 0.093, F2,16 = 0.817, p = 0.459).

 

4. Discussion

The richness of six bivalve species recorded for the sampled shallow lakes in the Cuiabá floodplain corresponds to about 20% of the known richness for lotic environments in this system (M. C. Mansur, pers. comm.). In southern Brazil, Mansur et al. (1991) and Pereira et al. (2000) recorded, respectively, 13 native bivalve species (nine occurring in lakes and 11 in lotic environments) and 19 species, of which only six occurred in lentic environments such as those of the present study. Maltchik et al. (2010) recorded only bivalve's species of the Sphaeriidae for wetlands of this region.

Our results indicate that the structure of the bivalve assemblages in the lakes of the Cuiabá floodplain was determined by characteristics of the bottom and that there was an interaction between the factors of organic matter and sediment granulometry, which confirms some of the findings reported by other authors (Strayer, 1993; Layzer and Madison, 1995; McRae et al., 2004).

Medium sand and mud showed a positive correlation with the bivalve assemblage in this study, but silt affected the assemblage negatively. Strayer and Ralley (1993) found that the presence of bivalves was related with medium sand (0.25-1 mm), which is partially congruous with our study, in which a mesh size of 0.25 mm corresponded to fine sand and 1 mm mesh to medium size sand grains.

In a study of the bivalves of a temperate lake, Nalepa and Galvin (1988) found greater abundances in sediments consisting of coarse sand and gravel. Salmon and Green (1983) found that bivalves in lotic environments prefer coarse sediments (>2.0 mm). On the other hand, Mcrae et al., (2004) reported higher bivalve diversity in fine sediments (<2.0 to 2.0 mm). Other authors emphasized the importance of the various sediment particle sizes in maintaining the complexity of bivalve assemblages in rivers (Harman, 1972; Holland-Bartels, 1990; Poole and Downing, 2004). Therefore, whereas many species are tolerant to various types of sediments, others occur in specific kinds of sediment (Tevesz and McCall, 1979; Strayer, 1981; Salmon and Green, 1983).

Holland Bartels (1990) stated that the continuous addition of large quantities of fine sediment in the upper Mississippi River may cause a reduction in the current bivalve fauna, especially if it is substituted by fine sediment particles, reducing the diversity of particle sizes. Although bivalve species in general have shown a high tolerance for types of sediment, many of the species studied were statistically less abundant and lower densities were recorded in sites with fine sediment (very fine sand of 75-149 µm, silt and mud <75 µm) than in coarser sediments such as medium and fine sand. Callisto and Esteves (1996) found that the predominance of clay is related with lower abundances of benthic organisms and the presence of only a few groups.

Sediment deposition clog siphons and gills interfere in bivalve feeding and reproduction (Young and Williams, 1983; Dennis, 1984; Aldridge et al., 1987). Junk et al. (2006) claim that one of the threats to the Pantanal is the increase in sediment loads due to erosion. Fine sediments can be more harmful for bivalves in rivers of low gradients than in high gradients, which are more able to remove such particles by water washing (Strayer and Fetterman, 1999).

The shallow lakes grouped by the PCA presented the same granulometric composition, but showed differences in the percentages of sediment fractions. These differences may be essential in maintaining the diversity observed here since the species found presented different body sizes and life cycles. In the Mississippi River, sediments consisting of sand and gravel from areas adjacent to the main channel support almost doubled the density of bivalves than other lentic areas consisting of silt or homogeneous sands from the main channel (Duncan and Thiel, 1983).

The Serragem, Sinhá Mariana, Fartura and Arraial lakes formed a group in the PCA, probably because they presented the highest fractions of fine sand. C. inflata was common to all these lakes, which is compatible with Mansur and Valer (1992), who also recorded this species' preference for sandy sediments. On the other hand, in lakes where the presence of A. trapesialis was recorded, no individuals of C. inflata were found, or its abundance, by comparison, was low. Mansur and Valer (1992) and Pereira et al. (2000) found the species of the genus Anodontites to occupy clay or sludgy sediment. In the present study, A. trapesialis did not occur in lakes presenting predominantly sandy sediment, confirming the observations above.

Particulate organic matter is the main food of bivalves (Frissell et al., 1986; Ligon et al., 1995) and influences the structure of the bivalve assemblages of our study. By means of simple regression, we found a positive correlation between A. trapesialis and sediment organic matter (p = 0.017), so that higher abundances of this species were associated with higher percentages of organic matter. Spooner and Vaughn (2006) found that sediment organic matter was significantly higher in treatments with live bivalves (biologically active) than in treatments with biologically inactive shells or sediment.

These findings corroborate our hypothesis that the structure of the bivalve assemblage, in shallow lakes of the Cuiabá River floodplain is determined by two important substratum variables: organic matter and sediment granulometry. However, the factors analyzed here interact in determining the structure of the assemblage

Acknowledgements - The National Council for Scientific and Technological Development (CNPq) process number 132194/2006-6 and the FAPEMAT for the financial support. We also thank Dr. Maria Cristina Mansur and. Dr. Karl Matthias Wantzen for reading this paper and offering suggestions and to Chico Enésio, Vera Uhde and all lab colleagues to help in a field.

 

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Received February 16, 2011
Accepted July 14, 2011
Distributed May 31, 2012

 

 

* e-mail: callil@ufmt.br

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