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Iheringia. Série Zoologia

Print version ISSN 0073-4721On-line version ISSN 1678-4766

Iheringia, Sér. Zool. vol.98 no.4 Porto Alegre Dec. 2008

http://dx.doi.org/10.1590/S0073-47212008000400013 

Morphometric and genetic differentiation among populations of Eupemphix nattereri (Amphibia, Anura, Leiuperidae) from central Brazil

 

Diferenciação genética e morfométrica em populações de Eupemphix nattereri (Amphibia, Anura, Leiuperidae) do Brasil Central

 

 

Daniela de M. e SilvaI,II; Aparecido D. da CruzI; Rogério P. BastosIII; Mariana P. de C. TellesIII; José Alexandre F. Diniz-FilhoII,III

INúcleo de Pesquisas Replicon, Departamento de Biologia, Universidade Católica de Goiás, Avenida Universitária, 1440, 74605-010 Goiânia, Goiás, Brazil. (danielamelo@ucg.br)
IIPrograma de Pós-Graduação em Biologia Animal, Universidade de Brasília, Brasília-DF, Brazil
IIIDepartamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Goiânia, Goiás, Brazil

 

 


ABSTRACT

To assess genetic structure and phenotypic diversity of Eupemphix nattereri Steindachner, 1863, morphometric and molecular analyses were carried out for nine populations from the State of Goiás. A total of 11 morphometric traits were evaluated and genetic information was estimated using RAPD markers. Genetic and phenotypic distances were determined as a function of geographical origin. Correlation among genetic, morphometric, micro, and macroenviromental were analyzed by the Mantel test. Genetic data indicated high levels of genetic diversity (Φst= 0.3) among the nine populations. Mantel tests did not reveal a significant positive correlation between genetic and geographical distances, indicating that locally geographical populations were not genetically similar, even in distances smaller than 50 km. Discriminant analysis on 11 morphometric measurements showed a high divergence among the nine populations. However, a marginally significant correlation (P=0.08) between genetic and morphometric distances was found. The observed correlation was not causal in terms of the relationship between phenotype and genotype, but indicated common spatial structures. Thus, our results suggest that isolation-by-distance processes may explain population divergence in Eupemphix nattereri.

Keywords: Eupemphix nattereri, Morphology, RAPD markers, Gene flow, Population structure.


RESUMO

Visando conhecer a estrutura genética e a diversidade fenotípica da espécie Eupemphix nattereri Steindachner, 1863, análises morfométricas e moleculares foram realizadas em nove populações do Estado de Goiás. Onze caracteres morfométricos foram avaliados e a diversidade genética foi estimada com o uso de marcadores RAPD. As matrizes de distâncias genéticas e fenotípicas foram correlacionadas com as distâncias geográficas e dados macro e microambientais, utilizando o teste de Mantel. Em relação aos caracteres genéticos, foram encontrados altos níveis de diversidade (Φst= 0,3) entre as nove populações. Não houve, entretanto, uma correlação positiva significativa entre as distâncias genéticas e geográficas, indicando que populações geograficamente próximas não seriam geneticamente similares, mesmo estando situadas entre distâncias menores do que 50 km. Uma análise discriminante dos onze caracteres morfométricos evidenciou também uma elevada divergência entre as nove populações. Entretanto, foi encontrada uma correlação quase significativa (P=0,008) entre as distâncias genéticas e morfométricas. A correlação observada não foi casual entre fenótipo e genótipo, mas indicou estruturas espaciais comuns. Desta forma, nossos resultados sugerem que processos de isolamento por distância poderiam explicar a divergência populacional na espécie Eupemphix nattereri.

Palavras-chave: Eupemphix nattereri, Morfologia, Marcadores RAPD, Fluxo gênico, Estrutura populacional.


 

 

At present there are approximately 6,300 species of anuran amphibians over the world (IUCN, 2004), and the largest diversity is found in the Neotropics (DUELLMAN, 1988). Brazil represents one of the most diverse countries, with 747 species (SBH, 2005). In State of Goiás, more than 70 anuran species are known to occur, corresponding to 9.4% of Brazil's anuran diversity. However, the anuran fauna remains largely unknown in the central areas of Brazil (BRANDÃO & ARAÚJO, 1998).

Despite the high levels of species diversity, little is known about the population structure of amphibians in South America, due to the scarcity of data referring to the dynamics of the group (MYERS et al., 2000; YOUNG et al., 2001). Many studies on population genetic structure of amphibians sustain the idea that among vertebrates, amphibians exhibit relatively low vagility and are highly philopatric (BLAUSTEIN et al., 1994; SEPPÃ & LAURILA, 1999; SHAFFER et al., 2000; LAMPERT et al., 2003), allowing the accumulation of genetic and morphological differences among populations (BLOUIN & BROWN, 2000; CAMP et al., 2000; MÉNDEZ et al., 2004). Consequently, amphibians have recently become a focus in studies trying to understand ecological and evolutionary processes (ZEISSET & BEEBEE, 2003; ETEROVICK et al., 2005; FUNK et al., 2005).

The family Leiuperidae comprises 7 genera, and 48 species, occurring all over the Neotropical region and including species that have terrestrial, fossorials, arboreal, and aquatic habits (FROST et al., 2006).

The genus Eupemphix (Leiuperidae) was described by Steindachner (1863) to include the species Eupemphix nattereri, whose type locality is Cuiabá, Mato Grosso, Brazil (NASCIMENTO et al., 2005). Eupemphix nattereri is a frog largely distributed in South America, ranging from the east of Paraguay to central and southeast Brazil (CEI, 1980; FROST, 2004). At the beginning of the rainy season, males and females are found reproducing in permanent and temporary ponds in open areas (BRASILEIRO et al., 2005). The breeding season can extend for many months, characterizing the reproductive pattern as explosive (WELLS, 1977).

Analyses of intraspecific geographical variability in morphology have often revealed extensive variation in body size among amphibians (BABIK & RAFINSKI, 2000; CASTELLANO et al., 2000; SCHÄUBLE, 2004). Body size is a fundamental morphological trait, important in a physiological, ecological, and behavioral context of a species (SCHÄUBLE, 2004). However, causes and maintenance of geographical variation in morphology are likely to be complex and not always well understood (MALHOTRA & THORPE, 1997).

Studies based on molecular markers, such as RAPD (Random Amplified Polymorphic DNA) have contributed in a complementary manner to the understanding of amphibian population genetics all over the world (RAFINSKI & BABIK, 2000; TRAKIMAS et al., 2003; ZEISSET & BEEBEE, 2003). RAPD are based on randomic amplifications of DNA fragments by small primer sequences of approximately 8 to 10 base pairs (RABOUAM et al., 1999). Dominant markers such as RAPD can be easily developed, even for species without prior genetic information at low costs (MUELLER & WOLFENBARGER, 1999). Consequently, RAPD markers represent molecular tools that help answer questions about variations among individuals and populations (VON EGGELING & SPIELVOGEL, 1995; CUSHWA & MEDRANO, 1996; HASSANIEN et al., 2004).

The current paper reports on the association among morphometric, genetic, macroenvironmental, and microenvironmental data of nine populations of Eupemphix nattereri, from the State of Goiás. Our hypothesis is that it is possible to infer the population structure of Eupemphix nattereri by investigating the levels of similarity and genetic diversity between and among populations of this anuran. Thus, it was determined the extent of genetic differentiation of Eupemhix nattereri in Central Brazil using RAPD markers and, it was also evaluated the potential correlations among morphological variation, abiotic factors, and genetic differentiation.

 

MATERIALS AND METHODS

Study Area. All nine study areas were located in State of Goiás, central Brazil, between parallels 14ºN and 19º S and the meridians 52.5º W and 40ºE, occupying an area of 281,250 Km2. The vegetation of these areas is composed by different physiognomies of the Cerrado biome, forming savanna-like vegetation in the well-drained interfluves, and gallery forests along streams and rivers (RATTER et al., 1998).

A total of 132 specimens of E. nattereri were collected at the nine municipalities (Fig.1), during the rainy season of 2002-2004, between October and March. Sampling localities, sample sizes, coordinates, micro environmental characteristics of each municipality are listed in Table I. Voucher individuals were deposited in the Zoological Collection of the Universidade Federal de Goiás (ZUFG).

 

 

Morphometric analysis. Eleven external body measurements were taken from each of the 132 adult specimens of E. nattereri. All the measurements are expressed in millimeters. Measured specimens were fixed in 10% formalin and maintained in 70% ethyl alcohol. For measurements we used an ocular micrometer in a stereomicroscope and calipers to the nearest 0.05 mm. Raw morphometric data were log-transformed to perform a parametric statistical analysis. The descriptions of each measurement are listed in Table II.

Molecular data. Genomic DNA was purified from 20mg of frozen liver with DNA purification Kit, according to manufacture's procedures. Amplification reactions were performed in a final solution of 20µl with 2.5 ng of genomic DNA, 10X reaction buffer, 2mM of MgCl2, 0.26 mM of each dNTP, 10 ng of a single primer (Operon Technologies), 0.5 U of Taq DNA-polymerase and double distiled H2O. The cycling amplification parameters were: initial denaturation at 96ºC for 3 min, followed by 40 cycles of denaturation for 1 min at 92ºC, annealing for 1 min at 35º C and elongation for 1 min at 72ºC. Ten microliters of each reaction product were loaded in a horizontal 1.5% agarose gel and electrophoresed at 5V/cm. The images obtained by each gel were captured using a video-documentation system and analyzed with Image Master 1D software (Total Lab, Amersham Pharmacia Biotech, USA).

A total of 40 primers were tested to select those with the best amplification pattern. The presence of a determined locus was confirmed by the software Master 1 D (Total Lab, Amersham Pharmacia Biotech, USA) by verifying the peaks of the bands during gel analyses. Loci with peaks smaller than 20 pixels, after two repetitions, were excluded from the analyses (Fig. 2).

After this initial evaluation, eigth primers (Tab. III) were used in the analysis of DNA polymorphism between and among populations. The eigth RAPD primers produced a total of 82 distinct, reproducible bands that comprised the complete data set. A binary matrix was constructed from the gel readings, where the individuals were genotypically characterized for presence (1) and absence (0) of bands.

 

 

Statistical analysis. To determine the degree of morphological differentiation between and among populations, and to identify which biometric parameter most contributed for the variation in morphology, analyses of variance (ANOVA) were performed. Components of variance of ANOVA model II permitted the estabilishment of the variation between and among local populations, for each trait. Patterns of morphometric discrimination were examined by canonical analysis or multiple discriminant analysis (NEFF & MARCUS, 1980).

The eleven morphometric characteristics were log-transformed, the eigenvalues and eigenvectors were obtained by the product of the variance-covariance matrix between and among populations (NEFF & MARCUS, 1980). The Mahalanobis distance squared (MDS) obtained by the canonical scores, was used to visualize the pattern of morphometric differentiation among the nine populations. All analyses were performed using the software SYSTAT/SYSGRAPH (BROWNE & MELS, 2000).

Analysis of molecular variance (AMOVA) of the genetic matrix was obtained by Euclidean distances between all pairs of haplotypes (EXCOFFIER et al., 1992). AMOVA was performed by partitioning the total variation among and within population, using that Euclidean distances. Total variation was expressed by the Φst coefficient and the significance was tested using 1,000 permutations. All statistical analyses were performed with WINAMOVA software, from L. Excoffier (University of Geneva). Genetic similarity dendograms among the nine populations were constructed by using the Φst coefficients and the UPGMA grouping method (SNEATH & SOKAL, 1973). The significance of the dendogram was tested by a cophenetic correlation with 5,000 permutations, using the software NTSYS 1.5 (ROHLF, 1989).

Mantel test (MANLY, 1997) using NTSYS 1.5 (ROHLF, 1989) was used to determine the significance of correlations using matrices of pairwise distances between populations, with 1,000 randomizations. Microenvironmental variables used in the analyses included: relative air temperature, air humidity, and altitude. Macroenvironmental data were obtained from the Atlas of Biosphere (SET, 2002), using a grid formate of ArcView archive. All cells from the grid contained the coordinates for each municipality.

The following distance matrices were used in these analyses: (a) the morphological matrix of morphometric distances (Mahalanobis distances) among populations; (b) the genetic matrix obtained by AMOVA; (c) the geographical distance matrix; (d) the matrix of Euclidean distances among populations, using standardized macroenviromental data (media=0 and variance=1); and (e) the matrix of microenviromental data.

 

RESULTS

ANOVA detected differences among populations (Tab. IV) related to the 11 morphometric characteristics. Canonical Variates Analysis confirmed the significant difference among populations (λ de Wilks= 0.17; P= 0). The first canonical variable (VC1) detected differences among the nine populations mainly for SVL, HW and HL. The second canonical variables (CV2) which indicate limb measurements, such as FL, F and TL, exhibited positive correlations, demonstrating morphometric variation among anuran populations (Tab. V). The scores of the two canonical variables for each population are shown in Fig. 3.

 

 

 

 

 

 

The size of the amplicons varied from 100 to 2,000 base pairs. The number of RAPD fragments by primer varied from 6 to 14 (Tab. III). AMOVAindicated a variation of 70% between populations and 30% among populations (Tab.VI). The Φst coefficient indicated a significant difference among populations, suggesting low gene flow among individuals and high fidelity to the breeding site. UPGMA showed genetic distances among the nine populations (Fig. 4) and the cophenetic correlation coefficient was r=0.80.

 

 

Macroenviromental data had mean pluviometric indexes of 91.9 (SD=+6.8), annual temperatures of 23ºC (SD= +0.7), and relative air humidity of 68.5% (SD=+2.0). Mean Air temperatures, humidity, and altitude were 25.5ºC (SD=+3.3), 70% (SD=+11), and 789 m (SD=+239), respectively.

Results of the correlation matrix obtained by Mantel test are summarized in Fig. 5. There was a significant statistical correlation (r=0.75; P=0.001) between geographical and macroenvironmental matrixes (pluviometric indexes, mean temperature, and air humidity). A marginally positive correlation (P=0.08) was found between morphometric and genetic variation (Fig. 6), which could be explained by evolutionary forces, selecting the genetic make up responsible for morphological traits in E. nattereri. No correlation was observed between morphometric variation and microenviromental data. Although significant correlations were not obtained between morphometric distance and macroenviromental data, all nine populations of E. nattereri reported here did not present a spatial pattern with respect to genetic and geographical distances.

 

 

DISCUSSION

Body size and head length were the two variables that mostly contributed for significant differences related to morphometric traits, as observed for other groups (CASTELLANO & GIACOMA, 1998; CASTELLANO et al., 1999; BABIK & RAFINSKI, 2000; CASTELLANO et al., 2000; MÉNDEZ et al., 2004, ROSSO et al., 2004). According to our results, the variation in morphological traits did not present a spatial pattern, showing a substantial overlap in overall morhometric variables of the studied populations.

In a study performed with 22 populations of Physalaemus cuvieri Fitzinger, 1826 also from the Cerrado, showed that individuals located in dryer sites in the north of State of Goiás had larger sizes (Juliano & Bastos, unpublished data). However, the difference in body size along a latitudinal gradient of humidity could happen because animals from wet climates reproduce earlier than populations in dryer climates; thus, size is only a consequence of climate-driven reproductive activity (CASTELLANO et al., 2000). Other component that may influence morphological variation in amphibians is the specific vegetation at each area. Most morphological traits correlates with one another, either body shape or body size varies according to their habitat (ROSSO et al., 2004). In our study, all populations of E. nattereri were sampled in areas of Cerrado. It is known that this vegetation is a mosaic, and even in the closest areas there is a wide variation in the kind of vegetation throughout Cerrado ecossystems (BRASILEIRO et al., 2005).

In anuran amphibians, adult body sizes depend on many factors including time of metamorphosis, growth rate before and after maturity, age of maturity, and longevity (ROSSO et al., 2004). Moreover, genetic and environmental differences can cause diversity in ontogenetic development, resulting in body size variation. Thus, besides ecological factors, genetic, physiological and ontogenetic factors may also explain the wide range of trait variations found in E. nattereri. Our data suggest that ecological and genetic factors act in synergism to increase specimen's variation. Because of the complex patterns of morphometric traits, the environmental variables used in this study could not account for the intricate steps beyond the evolutionary mechanisms of Cerrado's anurans. Consequently, the correlation observed between phenotypic and environmental matrixes of distances was only marginal.

It must be consider that other factor in local scales, not analyzed in this study, such as pond temperatures and pH, during the development of tadpoles could influence morphometric traits, as described to Rana arvalis (RÄSÄNEN et al., 2003). The water has a potential effect on morphology and larval development and, therefore, is a relevant factor affecting body size in ectotherms (Atkinson, 1996).

With respect to the genetic differentiation, high level of diversity was found (Φst=0.3) among the studied populations. There was not a statistically significant correlation between genetic and geographical distances, indicating that sites geographically close were not genetically similar. Many studies of intraspecific genetic variation in anurans have been conducted along extended scales, of many kilometers, and their results show a substantial variation among populations (LAMPERT et al., 2003; TRAKIMAS et al., 2003; ZEISSET & BEEBEE, 2003; PALO et al., 2004; TELLES, 2005). Thus, our data pointed out a strong evidence to support the previous statement even for places situated as close as 50 km.

According to NEWMAN & SQUIRE (2001), there are explanations, other than just limited gene flow, both genetic and evolutive for local differentiation in neutral markers. At fine spatial and temporal scales, where mutation is less likely to be an important factor, population genetic structure depends on the relative rates of gene flow and dynamics of population size, which determine the rate of genetic drift and turnover of local populations. Even when there is some exchange of individuals among populations, if effective population size is small, fine-scale differentiation may result from high rates of drift and that may be the case for the populations used in this study.

Therefore, a statistical significant correlation, between morphometric and genetic data in the populations of Eupemphix nattereri indicates that the divergence among populations of this species must follow the model of isolation by distance, and even morphometric and genetic variations could be influenced by a spatial structure, although in a fine scale. The results of the current study showed no sufficient evidence to provide no more than a tentative explanation for the spatial structure of E. nattereri population in central Brazil. However, as genetic variation is probably neutral and therefore could not be associated to morphometric variation, the trends for a positive correlation could only be explained by isolation by distance.

In conclusion, the results of the current study indicated limited gene flow among the populations of Eupemphix nattereri. Several recent studies showed that amphibians avoid open habitats, as fields and roads, moving mostly in forest areas (MADISON & FARRAND, 1998; ROTHERMEL & SMELISTCH, 2002). This peculiar behaviour occurs because of increased risks of desiccation and predation in open areas (SPEAR et al., 2005). As the sample sites were representative of Cerrado biome, characterized by open areas, amphibian behaviour could be responsible for the reduced gene flow, causing simultaneously genetic and morphological differentiation among populations.

Acknowledgments. The authors thank L. D. Guimarães and W. V. Silva for their support during field collections and F. Lobo for the map. We also thank S. Quail for proofreading this manuscript. To IBAMA for the sample license number 017/05. To CNPq (proc. 520804/99-6, 465137/00-8 and 474.189/03-1) and PRONEX (SECTEC-GO proc. 23234156) for their support. To CNPq, for J. A. F. Diniz-Filho, R. P. Bastos and M. P. C. Telles fellowships, and to Pró-Reitoria de Pesquisa e Pós-Graduação from Universidade Católica de Goiás for financial support.

 

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Recebido em abril de 2006. Aceito em novembro de 2008.

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