Distribution of populations of broad-snouted caiman (Caiman latirostris, Daudin 1802, Alligatoridae) in the São Francisco River basin, Brazil

Filogonio, Renato; Vb, Assis; Lf, Passos; Me, Coutinho

doi:10.1590/s1519-69842010000500007

Cited by 17 publications

(11 citation statements)

References 14 publications

(13 reference statements)

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“…The Broad-snouted Caiman has a wide latitudinal distribution in South America (between 5°S and 32°S; Filogonio et al, 2010;Verdade et al, 2010), with the southernmost distribution occurring in Santa Fe province, Argentina (31°S; Simoncini et al, 2009), where populations have been under management by "Proyecto Yacaré" since 1990 (Larriera, 1990). Proyecto Yacaré in Argentina (Larriera et al, 2008), was undertaken to achieve sustainable use of caimans in wetlands in Northern Santa Fe Province.…”

Section: Introductionmentioning

confidence: 99%

Size of nesting female Broad-snouted Caimans (Caiman latirostris Daudin 1802)

Leiva

Simoncini

Portelinha³

et al. 2019

Braz. J. Biol.

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The southern distribution of the Broad-snouted Caiman (Caiman latirostris Daudin 1802) in Argentina occurs in Santa Fe Province, where its population has been under management by "Proyecto Yacaré" since 1990. From 1997 to 2016, we captured 77 nesting female Broad-snouted Caimans in Santa Fe Province. Our results suggest that previously defined size classes for Broad-snouted Caiman do not adequately describe the reproductively mature female segment of the population. Here we propose to change size ranges for general size classes for Broad-snouted Caiman. In addition, we have observed that reintroduced reproductive females by Proyecto Yacaré represent about 32% of captured females. These results indicate that reintroduced females by the management program are surviving and reproducing in the wild at least up to 20 years.Keywords: management, size class, reproduction, sexual maturity. Tamanho de fêmeas nidificantes do jacaré-de-papo-amarelo (Caiman latirostris Daudin 1802)Resumo Na Argentina, a distribuição mais austral do jacaré-de-papo-amarelo (Caiman latirostris Daudin 1802) ocorre na Provincia de Santa Fe, sendo que suas populações são manejadas pelo "Proyecto Yacaré" desde 1990. Entre os anos de 1997 e 2016, nós capturamos 77 fêmeas nidificantes do jacaré-de-papo-amarelo em Santa Fe. Nossos resultados sugerem que as classes de tamanho definidas para o jacaré-de-papo-amarelo não representam a realidade dos animais capturados no presente estudo. Portanto, propõe-se uma alteração nas classes de tamanho para o jacaré-de-papo-amarelo. Nós também observamos que as fêmeas reintroduzidas pelo "Proyecto Yacaré" representaram 32% das fêmeas capturadas. Estes resultados indicam que fêmeas reintroduzidas pelo programa de manejo estão sobrevivendo e reproduzindo na natureza por, pelo menos, 20 anos.Palavras-chave: manejo, classe de tamanho, reprodução, maturidade sexual.

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Section: Introductionmentioning

confidence: 99%

Size of nesting female Broad-snouted Caimans (Caiman latirostris Daudin 1802)

Leiva

Simoncini

Portelinha³

et al. 2019

Braz. J. Biol.

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“…Populations are the unit of the evolutionary process (Dobzhansky 1970). Conservation genetic efforts should focus on populations to preserve the evolutionary process itself besides the conservation biology aspects.…”

Section: Categorization Lists and Conservation Programsmentioning

confidence: 99%

Perspectives and Final Considerations About the Molecular Ecology of New-World Crocodilians

Amavet

Zucoloto

2020

Conservation Genetics of New World Crocodilians

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This final chapter summarizes the main concepts expressed in this book, condensing the main findings developed over many years through genetic research in crocodile populations of the New World. Since the development of new technologies, researchers from the New World have been applying them successfully in the species that concern us. In this way, a large amount of information has been collected over time, as displayed throughout the reading of this book, obtaining a body of knowledge that contributes to the conservation of its populations. Basic data have been obtained, such as population parameters of genetic diversity up to applied data, for example, determining the species or population of origin to which a commercial product belongs. A large part of the successful results was obtained thanks to the collaboration between working groups of crocodile specialists, which allows extending the sampling, and the genetic information or markers to be used or increase the depth of the analysis. The fundamental ideas developed in each of the previous chapters are organized here with the aim of elaborating on the final conclusions of this book.

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“…hot climates, and as predators, they are important for the overall balance of their ecosystems (Naish, 2001). Six of the 25 species of alligators worldwide (Pincheira-Donoso et al, 2013) are found in Brazilian territory (Filogonio et al, 2010), and among these is the Pantanal Caiman. Several…”

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confidence: 99%

Influence of incubation temperature and embryonic motility on the growth of members of Caiman yacare (Daudin, 1802)

et al. 2024

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This study aimed to evaluate whether skeletal development of the Pantanal Caiman (Caiman yacare) is similarly influenced by temperature variation and controlled increases in embryo motility. All eggs were incubated at 90% humidity and 29 °C for the first 45 days. Thereafter, the incubation temperature was either maintained at 29 °C and embryos were treated with 4-aminopyridine (4-AP) on days 46, 47, 48, and 49 (Group I, 29 °C 4-AP, n = 15); maintained at 29 °C (n = 14; Group II); or at 33 °C (n = 14, Group III). Embryonic movement was measured using an Egg Buddy® digital monitor on days 30, 35, 42, 49, 56, and 60, at which point embryos were euthanized and samples were collected for analysis. No differences were observed between groups with varying incubation temperatures. In contrast, embryonic motility was greater in embryos treated with 4-AP (P < 0.001) on day 49, and this was associated with higher proportions of snout-vent and hand lengths. This study demonstrates for the first time that pharmacologically induced increases in embryo motility result in phenotypic changes to the proportion of elements during prenatal ontogeny, thereby effectively altering the adaptation of the species to specific environments.

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Distribution of populations of broad-snouted caiman (Caiman latirostris, Daudin 1802, Alligatoridae) in the São Francisco River basin, Brazil

Cited by 17 publications

References 14 publications

Size of nesting female Broad-snouted Caimans (Caiman latirostris Daudin 1802)

Size of nesting female Broad-snouted Caimans (Caiman latirostris Daudin 1802)

Perspectives and Final Considerations About the Molecular Ecology of New-World Crocodilians

Influence of incubation temperature and embryonic motility on the growth of members of Caiman yacare (Daudin, 1802)

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