Effect of Habitat on Survival of Eggs and Sex Ratio of Hatchlings of Caiman crocodilus yacare in the Pantanal, Brazil

Campos, Zilca

doi:10.2307/1564927

Cited by 76 publications

(70 citation statements)

References 11 publications

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“…Magnusson et al (1990) showed a FM pattern (see Table 4.2) but nests in P. trigonatus do not appear to reach temperatures higher than 32˚C, which may explain the absence of high-temperature females. Contrary to the report in Lang and Andrews (1994), Campos (1993) did not describe sex ratios in P. trigonatus.…”

Section: Schneider's Dwarf Caiman (Paleosuchus Trigonatus)contrasting

confidence: 87%

See 1 more Smart Citation

Temperature-Dependent Sex Determination in Vertebrates

Valenzuela¹,

Lance²

2018

Open Monographs

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Section: Schneider's Dwarf Caiman (Paleosuchus Trigonatus)contrasting

confidence: 87%

“…Campos (1993) showed that eggs from nests with originally high temperatures (Ͼ 31.5˚C) produced 100% females if translocated to the laboratory before day 40 of development. By contrast, similar nests translocated after 40 days of development produced varying numbers of males.…”

Section: Yacare Caiman (Caiman Crocodilus Yacare)mentioning

confidence: 99%

Temperature-Dependent Sex Determination in Vertebrates

Valenzuela¹,

Lance²

2018

Open Monographs

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“…Baceiros representaram 2,4% da vegetação pantaneira, com maior proporção nas sub-regiões de Cáceres (10,3%) e Abobral (7,8%). A distribuição dos baceiros é um importante fator para o estudo de dinâmica de populações de jacarés-do-pantanal (Caiman crocodilus yacare), pois representam um dos habitats preferenciais para a sua nidificação (Campos 1993). A ocorrência deste tipo de vegetação também apresenta alta correlação com a densidade de cervo-do-pantanal (Blastocerus dichotomus), indicando a profundidade da coluna d'água (Mauro et al 1995).…”

Section: Resultsunclassified

Distribuição e quantificação de classes de vegetação do Pantanal através de levantamento aéreo

et al. 2000

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-(Distribution and quantification of vegetation classes by aerial survey in the Brazilian Pantanal). An aerial survey was adapted and used for the first time to elaborate maps of distribution and quantification of vegetation classes in the Pantanal wetland, per sub-region. Sixteen vegetation classes where identified based on phytophysiognomic aspects, the most important being grassland (31.1%), cerradão woodland (22.1%), cerrado (14.3%), marshes (7.4 %), semideciduous forest (4.0%), gallery forest (2.4%) and floating mats (2.4%). These informations can support decisions in the conservation or selection of preserved areas, as well as to help to monitor vegetation over a vast and remote region. RESUMO -(Distribuição e quantificação de classes de vegetação do Pantanal através de levantamento aéreo). O método delevantamento aéreo foi adaptado e utilizado pela primeira vez para a elaboração de mapas de distribuição e quantificação de classes de vegetação no Pantanal Mato-Grossense por sub-região. Foram identificadas 16 classes, baseando-se em aspectos fitofisionômicos, sendo as principais campo (31,1%), cerradão (22,1%), cerrado (14,3%), brejos (7,4%), mata semidecídua (4,0%), mata de galeria e 2,4% de baceiro ou batume. Estas informações podem subsidiar a escolha de áreas de conservação ou preservação, bem como auxiliar o monitoramento de áreas com grande extensão e difícil acesso.

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“…Unless juvenile females were restricted to non-sampled areas, this result suggest a strong skewed sex-ratio. Skewed sex-ratios are commonly reported in crocodilians (Hall 1990;Campos 1993;Thorbjarnarson 1997), which can sometimes be extreme with 100% of hatchlings of one sex as found in Crocodylus moreletii (López-Luna et al 2011). They are generally considered to refl ect variations in environmental conditions (Lutz & Dunbar 1984;Lance et al 2000;Leslie & Spotila 2001) and/or differential mortality of females vs males during the fi rst years of life (Lance et al 2000).…”

Section: Discussionmentioning

confidence: 99%

A three-year mark-recapture study in a remnant population of Crocodylus acutus Cuvier in Portete Bay (Guajira, Colombia)

Espinosa

Bertin

Gómez³

et al. 2012

Gayana (Concepc.)

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RESUMENEl Cocodrilo Americano Crocodylus acutus, ha experimentado importantes declines poblacionales a lo amplio de su distribución debido a la persecución humana, la sobreexplotación y la pérdida de hábitat. C. acutus permanece en peligro crítico en algunos países tales como Colombia donde la ausencia de estudios detallados sobre su ecología y distribución constituyen una de las barreras principales para el desarrollo de efectivas estrategias de conservación. Durante tres años desarrollamos un estudio de captura-recaptura para investigar el estatus demográfi co de C. acutus e identifi car las variables medioambientales más infl uyentes en su distribución en Bahía Portete (Colombia). Nosotros estimamos que la población de cocodrilos es relativamente pequeña (< 140 animales), incluye muy pocos adultos y demuestra un fuerte défi cit de hembras en la clase juvenil. La humedad relativa y la temperatura promedio del aire estuvieron positivamente correlacionadas con el número de avistamientos de cocodrilos. Por el contrario, la salinidad promedio del agua se encontró relacionada con la baja probabilidad de observación, presumiblemente debido a la preferencia de los juveniles por áreas de baja salinidad. Nuestros resultados sugieren que la población de C. acutus en Bahía Portete está en riesgo y puede requerir la intervención humana para asegurar su persistencia.Palabras claves: Captura-recaptura, cocodrilo, variables medioambientales, manglar ABSTRACTThe American crocodile, Crocodylus acutus, has experienced important population declines worldwide due to human persecution, overexploitation and habitat loss. C. acutus remains critically endangered in some countries such as Colombia where the lack of detailed surveys on its ecology and distribution constitutes a major barrier to the development of effective conservation strategies. We conducted a three-year capture-recapture study to investigate the demographic status of C. acutus and to identify environmental variables likely to infl uence its distribution in Portete Bay (Colombia). We estimated the crocodile population to be relatively small (< 140 animals), to include very few adults, and to demonstrate a very strong defi cit in females in the juvenile class. Both mean air temperature and relative humidity were positively correlated with the number of sightings. In contrast, mean water salinity was found to decrease the probability of observing a crocodile, presumably due to juvenile preference for low salinity areas. Our fi ndings suggest that the population of C. acutus in Portete Bay is at risk and may require human intervention to assure its persistence.

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Effect of Habitat on Survival of Eggs and Sex Ratio of Hatchlings of Caiman crocodilus yacare in the Pantanal, Brazil

Cited by 76 publications

References 11 publications

Temperature-Dependent Sex Determination in Vertebrates

Temperature-Dependent Sex Determination in Vertebrates

Distribuição e quantificação de classes de vegetação do Pantanal através de levantamento aéreo

A three-year mark-recapture study in a remnant population of Crocodylus acutus Cuvier in Portete Bay (Guajira, Colombia)

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