Síntese das Características da Ordem Crocodylia, Fatores de Influência em Estudos Populacionais e Aspectos de Seleção e uso de Habitat para Caiman crocodilus e Melanosuchus nigerno Estado do Tocantins, Brasil

Pereira, André Costa; Malvásio, Adriana

doi:10.18561/2179-5746/biotaamazonia.v4n1p111-118

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…We located individuals at night using the Homing technique, following the radio signal until we were sure that the individual was <1m away due to increased quality and frequency of receiver beeps (Knapp and Owens, 2005;Trejo et al, 2008) and recorded their position with a GPS, water depth, habitat type (see below for a description), date, and time (Campbell, 2013;Pereira and Malvasio, 2014).…”

mentioning

confidence: 99%

Home range and habitat use of two sympatric crocodylians (Melanosuchus niger and Caiman yacare) under changing habitat conditions

2020

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We used radio-telemetry to record how Caiman yacare (Cy) and Melanosuchus niger (Mn) responded to the intrusion of the Maniqui river into Cedral Lagoon in the Bolivian Amazon. Nine M. niger and 3 C. yacare were followed between December 2015 and May 2016. Both species showed a gradual reduction in mean monthly range from December (19.96 ha Mn and 1.74 ha Cy) to May 2016 (0.08 ha Mn and 0.24 ha Cy). Habitat use was fairly constant throughout the months for both species, Melanosuchus niger used mainly open swampy forests and Cyperaceae Marshes, while C. yacare used more islands and flooded grasslands. This study shows that both species of caimans responded to changes in depth and vegetation types, as their habitat as a whole was changed by river intrusion.

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confidence: 99%

Home range and habitat use of two sympatric crocodylians (Melanosuchus niger and Caiman yacare) under changing habitat conditions

2020

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“…Species with larger stylopods and zeugopods are better adapted to hot climates and are prone to terrestrialization, whereas species with smaller stylopods and zeugopods are better adapted to aquatic and colder habitats; the inverse of these characteristics holds true when considering autopod elements. Characteristics related to the structures of crocodilian skulls indicate that animals with narrow and long faces are better adapted to environments with greater water availability (Pereira and Malvasio, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…This confirms that motility impacts the individual alteration of elements, as described by Pollard et al (2014) and Pollard et al (2017), and is a controlling factor in the behavioral characterization of a species. Verdade (2001), Pereira and Malvasio (2014), Allen et al (2014), andBöhmer et al (2018) describe the existence of interspecific anatomical variation among crocodilians and their habitat requirements. Therefore, the increase in the proportion of hands and snout-vent lengths in Pantanal Caiman detected in this study could be attributed to morphological characteristics related to adapting to habitats with greater water availability.…”

Section: Discussionmentioning

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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“…Caiman crocodilus é a espécie com maior frequência da família (Da Silveira, R., 2003), faz parte do Anexo I -CITES (Convention ..., 2017), apresentando perfil generalista, com pouca exigência quanto à qualidade de habitats (Rueda-Almonacid et al, 2007;Velasco e Ayarzagüena, 2010;Pereira, Malvasio, 2014). Padrões de colorações que divergem demasiadamente do que já é consolidado na literatura vêm sendo investigados em répteis há quase trinta anos (Dyrkacz , 1981).…”

Section: Introdução unclassified

Leucismo em jacaretinga: relato de caso

Silva

Farikoski

Souza

et al. 2020

Arq. Bras. Med. Vet. Zootec.

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RESUMO Dentre os crocodilianos com ocorrência no Brasil, o Caiman crocodilus (Linnaeus, 1758) é a espécie de maior frequência, porém sua presença em estudos científicos restringe-se a levantamentos faunísticos, na maioria das vezes. O leucismo, também conhecido como albinismo parcial, é uma anomalia cromática ainda pouco conhecida. Indivíduos portadores dos genes que condicionam a doença apresentam ausência de pigmentação em uma parte ou em todo o corpo, porém os olhos não apresentam alteração. O objetivo deste trabalho foi realizar o primeiro registro de Caiman crocodilus com leucismo no mundo.

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Síntese das Características da Ordem Crocodylia, Fatores de Influência em Estudos Populacionais e Aspectos de Seleção e uso de Habitat para Caiman crocodilus e Melanosuchus nigerno Estado do Tocantins, Brasil

Cited by 7 publications

References 22 publications

Home range and habitat use of two sympatric crocodylians (Melanosuchus niger and Caiman yacare) under changing habitat conditions

Home range and habitat use of two sympatric crocodylians (Melanosuchus niger and Caiman yacare) under changing habitat conditions

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

Leucismo em jacaretinga: relato de caso

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