Estimating dispersal and gene flow in the neotropical freshwater turtle Hydromedusa maximiliani (Chelidae) by combining ecological and genetic methods

Souza, Franco L.; Cunha, Anderson Ferreira da; Oliveira, Marcos Antônio de; Pereira, Gonçalo Amarante Guimarães; Reis, Sérgio Furtado dos

doi:10.1590/s1415-47572002000200007

Cited by 21 publications

(17 citation statements)

References 20 publications

(18 reference statements)

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“…However, mean Nm based on F ST measures among subpopulations of the neotropical freshwater turtle (Hydromedusa maximiliana) was estimated to be 0.59 (Souza et al 2002), much lower than the N e m estimates for Blanding's turtle reported in our study, despite the fact that subpopulations of the Blanding's turtle were separated by greater distances.…”

Section: Discussioncontrasting

confidence: 90%

Directional gene flow patterns in disjunct populations of the black ratsnake (Pantheropis obsoletus) and the Blanding’s turtle (Emydoidea blandingii)

et al. 2008

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The estimation and maintenance of connectivity among local populations is an important conservation goal for many species at risk. We used Bayesian statistics and coalescent theory to estimate short-and long-term directional gene flow among subpopulations for two reptiles that occur in Canada as peripheral populations that are geographically disjunct from the core of their respective species' ranges: the black ratsnake and the Blanding's turtle. Estimates of directional gene flow were used to examine population connectivity and potential genetic source-sink dynamics. For both species, our estimates of directional short-and long-term gene flow were consistently lower than estimates inferred previously from F ST measures. Shortand long-term gene flow estimates were discordant in both species, suggesting that population dynamics have varied temporally in both species. These estimates of directional gene flow were used to identify specific subpopulations in both species that may be of high conservation value because they are net exporters of individuals to other subpopulations. Overall, our results show that the use of more sophisticated methods to evaluate population genetic data can provide valuable information for the conservation of species at risk, including bidirectional estimates of subpopulation connectivity that rely on fewer assumptions than more traditional analyses. Such information can be used by conservation practitioners to better understand the geographic scope required to maintain a functional metapopulation, determine which habitat corridors within a working landscape may be most important to maintain connectivity among subpopulations, and to prioritize subpopulations with respect to their potential to act as genetic sources within the metapopulation.

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Section: Discussioncontrasting

confidence: 90%

Directional gene flow patterns in disjunct populations of the black ratsnake (Pantheropis obsoletus) and the Blanding’s turtle (Emydoidea blandingii)

et al. 2008

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“…This pattern may be explained by the species' thermoconformity strategy and its dependence on cold-water streams with constant year-round temperatures, even during the summer Martins 2006, 2009). The spatial autocorrelation found by Moran's I index could also be explained by the ecological features of H. maximiliani, a small freshwater turtle species with limited dispersal capabilities (Souza et al 2002b), living in streams with relatively low water temperatures (18uC; Souza and Martins 2006) inside forest areas with dense canopy, mainly in mountainous regions above 600 m elevation ).…”

Section: Discussionmentioning

confidence: 94%

New Distribution Records and Potentially Suitable Areas for the Threatened Snake-Necked TurtleHydromedusa maximiliani(Testudines: Chelidae)

Costa

Rezende

Molina

et al. 2015

Chelonian Conservation and Biology

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Hydromedusa maximiliani is a freshwater turtle endemic to the Atlantic Forest of eastern and southeastern Brazil and threatened by extinction. Here, we add 15 new locality records for this species based on photographs of specimens encountered in the field and examination of museum collections. We also used ecological niche modeling tools of 3 different algorithms (GARP, SVM, and Maxent) to suggest potential suitable areas for the occurrence of the species. Models predict 53,679-263,844 km 2 of suitable habitat for H. maximiliani, with 8396-31,758 km 2 inside protected areas. Besides being useful in a reassessment of the species' conservation status, our results contribute to the knowledge of distribution patterns of H. maximiliani and highlight potential areas to drive future field surveys.

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“…A n a l i s a n d o -s e 8 0 p r i m e r s p a r a s e r e m utilizados na caracterização genética do quelônio (Hydromedusa maximiliani), Souza et al (2002) selecionaram nove, os quais obtiveram padrões de bandas de boa resolução e confiáveis para serem utilizados no trabalho. Ao analisarem o índice de polimorfismo de 33 primers em genótipos (Emydoidea blandingii) uma tartaruga semiaquática, Mockford, Snyder e Herman (1999) obtiveram apenas 4,5% de variação.…”

Section: Resultsunclassified

Variabilidade genética em muçuã utilizando marcadores moleculares RAPD

Silva¹,

Costa²,

Fortes³

et al. 2011

RCA

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Variabilidade genética em muçuã utilizando marcadores moleculares RAPD Genetic variability in Kinosternon scorpioides using RAPD molecular markers RESUMO: O muçuã (Kinosternon scorpioides) é uma espécie de extrema importância econômica no Estado do Pará, sendo indispensáveis estudos que viabilizem sua conservação e sua caracterização genética, a fim de direcionar programas de melhoramento nessa espécie e o monitoramento da sua variabilidade. O objetivo foi avaliar a variabilidade genética existente em populações de Kinosternon scorpioides do Banco de Germoplasma Animal da Amazônia Oriental (BAGAM), localizado em Salvaterra, na ilha de Marajó, no Estado do Pará, a fim de realizar uma caracterização molecular inicial da espécie. Foram utilizados marcadores moleculares RAPD (Polimorfismos de DNA Amplificados ao Acaso). Para tanto, foram obtidas amostras de DNA a partir de sangue total de 39 indivíduos de diferentes populações. A seleção de primers foi realizada a partir de um screening de quatro kits (kit OPA, OPU, OPJ, OPM), dos quais foram selecionados os doze mais polimórficos, que geraram bandas no intervalo de três a oito, viáveis para utilização. A análise de similaridade genética foi realizada com 53 marcadores RAPD, no programa NTSYS-pc, 2.0 utilizando o coeficiente de Jaccard. A partir dos dados gerados pela UPGMA (Unweighted Pair Group Method with Arithmetic Mean), pôde-se dimensionar a variabilidade existente entre os mesmos. Foram obtidos intervalos de similaridade genética variando de 3-98%, sendo que os indivíduos mais divergentes foram o M8 e o M14 com o M33 (0,03) e os mais similares, os genótipos M3 e o M4 (0,98). Os resultados indicaram a existência de variabilidade genética a ser explorada na espécie, tanto para programas de melhoramento genético como para a conservação da mesma.

show abstract

Estimating dispersal and gene flow in the neotropical freshwater turtle Hydromedusa maximiliani (Chelidae) by combining ecological and genetic methods

Cited by 21 publications

References 20 publications

Directional gene flow patterns in disjunct populations of the black ratsnake (Pantheropis obsoletus) and the Blanding’s turtle (Emydoidea blandingii)

Directional gene flow patterns in disjunct populations of the black ratsnake (Pantheropis obsoletus) and the Blanding’s turtle (Emydoidea blandingii)

New Distribution Records and Potentially Suitable Areas for the Threatened Snake-Necked TurtleHydromedusa maximiliani(Testudines: Chelidae)

Variabilidade genética em muçuã utilizando marcadores moleculares RAPD

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