Book Review: Wildlife Management: Crocodiles and Alligators

Webb, J.W.; Manolis, S. Charlie; Whitehead, PJ

doi:10.1071/wr9900207

Cited by 11 publications

(18 citation statements)

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“…Este proceso debería incluir el traslado de nidos en riesgos hacia áreas donde se generen similares condiciones de suelo al de la isla Juyui. En caso de no contar con esas áreas, lograr con la ayuda de los indígenas Wayuü una estrategia de incubación artesanal que no requiera de energía externa distinta a la oferta ambiental, y que disminuya los efectos drásticos de las variables climáticas, principalmente la incidencia directa de la radiación solar (Webb, Manolis, & Whitehead, 1987;Barros et al, 2010;Charruau, 2012). ii) Aumentar el área de anidación.…”

Section: Discussionunclassified

Ecología de la anidación de Crocodylus acutus (Reptilia: Crocodylidae) en Bahía Portete, La Guajira, Colombia

González

Barandica

Báez

et al. 2016

RBT

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Nesting ecology of Crocodylus acutus (Reptilia: Crocodylidae) in Bahia Portete, La Guajira, Colombia. C. acutus is cataloged in critical danger in Colombia. We studied its population at Bahia Portete, in order to survey the nesting activities and to obtain valuable information for a conservation management program. This study was undertaken with the participation of the Wayuü community using the Agreement Conservation Model, and took place during July 2007, August 2008, June and August 2009, and March to August 2010 and 2011. Sampling surveys were made by the use of transects along the coast, in order to find nests. For each nesting area found, we recorded the nests biometrics, eggs and hatchlings, fertility of the eggs and reproductive events. We explored a total of 55.12 km, and determined four nesting areas. Colonial nesting and the environmental variables were factors that affected the hatchling success. From the total of nests found, 37 % were oriented towards North, and 48 % were built next to Stenocereus griseus. Juyui island substrate was mostly constituted by sand (71.9 %, 71.44 %). The average number of eggs by nest was 28.42 ± 6.63, the largest egg diameter was 71.84 ± 3.54 mm, the average nest weight was 81.54 ± 9.99 g, and the hatchlings presented an average length of 25.47 ± 1.16 cm. For this specific site in Colombia, the reproductive period begins in March and ends in August. The few areas of nesting and the 95 % fertility suggest the performance of a conservation management program for this species at Bahía Portete. Rev. Biol. Trop. 65 (1): 211-228. Epub 2017 March 01.

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Section: Discussionunclassified

Ecología de la anidación de Crocodylus acutus (Reptilia: Crocodylidae) en Bahía Portete, La Guajira, Colombia

González

Barandica

Báez

et al. 2016

RBT

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“…crocodilus yacare como fazem alguns autores (Yamashita, 1993;Campos et al, 2003) teremos um grupo com enorme distribuição no continente americano, habitando desde o sudeste do México, na América do Norte, até o norte da Argentina, na América do Sul, (Ayarzagüena, 1983;Webb et al, 1987;Gorzula & Seijas, 1989;Thorbjarnarson, 1992;Brazaitis et al, 1996;Ross, 1998). A IUCN indica para esta espécie no Brasil projetos com moderada prioridade entre eles a implementação de programas de manejo sustentável, a diminuição do comércio ilegal de peles e estudos taxonômicos aprofundados que definam mais precisamente as espécies e/ou subespécies e suas respectivas distribuições geográficas.…”

Section: Caiman Crocodilusunclassified

“…A distribuição geográfica de C. crocodilus é altamente relacionada à de M. niger (Ayarzagüena, 1983;Webb et al, 1987;Gorzula & Seijas, 1989;Thorbjarnarson, 1992;Brazaitis et al, 1996;Da Silveira et al, 1997;Ross, 1998).…”

Section: Simpatria Das Espéciesunclassified

“…A espécie predominante no reservatório, durante o período amostrado, foi C. crocodilus, espécie de grande distribuição no Cerrado e Amazônia (Ayarzagüena, 1983;Webb et al, 1987;Gorzula & Seijas, 1989;Thorbjarnarson, 1992;Yamashita et al, 1993;Brazaitis et al, 1996;Ross, 1998 Webb et al, 1987;Thorbjarnarson, 1992;.…”

Section: Descrição Dos Habitats Ocupados Pelos Jacarésunclassified

“…Estes dados não foram confirmados na referida publicação, a qual relata que populações de Crocodilus acutus estudadas em diferentes localidades, apresentam-se enviesadas para o número de machos (Lance et al, 2000). A espécie P. palpebrosus aqui estudada apresentou razão sexual 2:1 (machos e fêmeas respectivamente) também sugerindo um viés populacional para o número de machos, e corroborando para a não distribuição enviesada de crocodilianos quanto ao número de fêmeas (Thorbjarnarson, 1997 Webb et al, 1987;Thorbjarnarson, 1992; Nenhum ninho foi localizado apesar dos relatos populares para sua existência.…”

Section: Descrição Dos Habitats Ocupados Pelos Jacarésunclassified

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Uso de habitat por Caiman crocodilus e Paleosuchus palpebrosus no reservatório da UHE de Lajeado, Tocantins.

Villaça¹

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Irregularly calcified eggs and eggshells of Caiman latirostris (Alligatoridae: Crocodylia)

Fernández

Simoncini

Dyke

2013

Naturwissenschaften

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We describe irregularly calcified egg and eggshell morphologies for the first time in nests of the broad-snouted caiman, Caiman latirostris. Research is based on detailed descriptions of 270 eggs from a total sample of 46,800 collected between 2005 and 2011 in Santa Fe Province, Argentina, and encompasses animals from both natural habitats and held in captivity. We discuss possible reasons for the occurrence of eggs with different mineralisation patterns in our extensive C. latirostris field sample and its conservation significance; the chemistry of egg laying in amniotes is sensitive to environmental contamination which, in turn, has biological implications. Based on our egg sample, we identify two caiman eggshell abnormalities: (1) regularly calcified eggs with either calcitic nodules or superficial wrinkles at one egg end and (2) irregularly calcified eggs with structural gaps that weaken the shell. Some recently laid clutches we examined included eggs with most of the shell broken and detached from the flexible membrane. Most type 1 regularly calcified eggs lost their initial calcified nodules during incubation, suggesting that these deposits do not affect embryo survival rates. In contrast, irregularly calcified caiman eggs have a mean hatching success rate of 8.9% (range 0-38%) across our sample compared to a mean normal success of 75%. Most irregularly calcified caiman eggs probably die because of infections caused by fungi and bacteria in the organic nest material, although another possible explanation that merits further investigation could be an increase in permeability, leading to embryo dehydration.

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Book Review: Wildlife Management: Crocodiles and Alligators

Cited by 11 publications

References 0 publications

Ecología de la anidación de Crocodylus acutus (Reptilia: Crocodylidae) en Bahía Portete, La Guajira, Colombia

Ecología de la anidación de Crocodylus acutus (Reptilia: Crocodylidae) en Bahía Portete, La Guajira, Colombia

Uso de habitat por Caiman crocodilus e Paleosuchus palpebrosus no reservatório da UHE de Lajeado, Tocantins.

Irregularly calcified eggs and eggshells of Caiman latirostris (Alligatoridae: Crocodylia)

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