Egg Failure in Natural and Relocated Sea Turtle Nests

Wyneken, Jeanette; Burke, Tom; Salmon, Michael; Pedersen, D. K.

doi:10.2307/1564360

Cited by 123 publications

(78 citation statements)

References 12 publications

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“…Echogenic dots were visible floating within the bladder and have been linked to the presence of urate crystals, parasites or faecal material (Wyneken 2001).…”

Section: Discussionmentioning

confidence: 99%

Clinical ultrasonography in loggerhead sea turtles (Caretta caretta): imaging of pathological features

Majo¹,

Macrı̀²,

Masucci³

et al. 2016

Vet. Med. - Czech

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Ultrasound scans were used to image pathological features in sea turtles. Scans were carried out in 19 loggerhead sea turtles, weighing from 2 to 21 kg, during the course of clinical examinations using 3.5 and 7.5 MHz sector transducers. The examination was performed after placing turtles in dorsal recumbency. Turtles were manually restrained and, in order to find the most suitable acoustic windows, were held down either by their heads (left and right cervicobrachial windows), front flippers (left and right axillary windows) or back flippers (left and right prefemoral and postfemoral windows). The right and left cervicobrachial windows allowed visualisation of the liver and gallbladder; the stomach was localised through the left prefemoral acoustic window; the intestinal loops were observed through the left and right prefemoral acoustic windows; the bladder was identified through both prefemoral acoustic windows. The pathological findings were as follows: idiopathic ileus, an intestinal linear foreign body and smooth muscle hypertrophy, presence of calculi and sediment in the gallbladder. These results highlight the importance of ultrasound examination along with clinical examination in sea turtles for the evaluation of coelomic pathologies.

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“…Echogenic dots were visible floating within the bladder and have been linked to the presence of urate crystals, parasites or faecal material (Wyneken 2001).…”

Section: Discussionmentioning

confidence: 99%

Clinical ultrasonography in loggerhead sea turtles (Caretta caretta): imaging of pathological features

Majo¹,

Macrı̀²,

Masucci³

et al. 2016

Vet. Med. - Czech

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“…O sucesso de eclosão e a mortalidade embrionária variam de acordo com características ambientais durante o período de incubação, que influenciam principalmente a temperatura e a umidade no interior do ninho (Ackerman 1997). Além disso, inundações pela maré e infestações por fungos e bactérias também podem influenciar a taxa de eclosão dos ninhos (Wyneken et al 1988, Phillot et al 2001.…”

Section: Discussionunclassified

“…Os ovos não desenvolvidos podem se tratar de ovos inférteis ou com mortalidade embrionária precoce. De acordo com Wyneken et al (1988), como os ninhos são abertos apenas após 50-70 dias de incubação, a mortalidade embrionária precoce pode ser mascarada pela decomposição e pode não ser distinguível da infertilidade verdadeira. Estudos em laboratório e em campo mais criteriosos, contudo, indicaram que a fertilidade dos ovos de tartarugas marinhas é superior a 90% (Whitmore & Dutton 1985, Wyneken et al 1988, provavelmente, portanto, grande parte dos ovos classificados como não desenvolvidos continham embriões mortos em fases iniciais de desenvolvimento.…”

Section: Discussionunclassified

Características da reprodução de tartarugas marinhas (Testudines, Cheloniidae) no litoral sul da Bahia, Brasil

et al. 2009

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Few studies have been carried out on nesting of sea turtles in the southern coast of Bahia, an area that is experiencing a fast process of tourist occupation what can increase levels of threat to these species. Thus, this study aimed to identify sea turtle species that nest in the area and to describe the main characteristics of their clutches. During four reproductive seasons, from 2004 to 2008, we identified and monitored nests found at beaches located between the municipalities of Uruçuca and Itacaré, in the southern coast of Bahia. The collected variables were: clutch size, incubation duration, hatching success and stages of embryonic mortality. We registered an average of 37 ± 6.2 nests per season, with nests of Caretta caretta and Eretmochelys imbricata being more frequent, along with sporadic nests of Chelonia mydas. Nesting season of C. caretta extends from October to January and that of E. imbricata from December to March. This temporary displacement of reproductive seasons might be related to a selective adjustment to minimize competition among species. Besides the time of nesting, the two species differed also in clutch size, but they did not differ in incubation duration and in hatching success. According to our results, we believe that areas with low concentration of nests should also be a target of conservation programs, due to their relevance to the increase of genotypic, and specially fenotypic, variation of sea turtle species, so that Brazilian populations can adapt and survive to the constant threats. Those conservation programs can be established by partnerships between non-governmental organizations and private institutions and the Brazilian government institution for the conservation of sea turtles (Centro TAMAR/ICMBio). Resumo: Poucos estudos foram realizados sobre a nidificação de tartarugas marinhas no litoral sul da Bahia, região que está passando por um processo rápido de ocupação turística que pode ameaçar ainda mais estas espécies. Por estes motivos, este estudo teve como objetivos identificar as espécies de tartarugas marinhas que desovam no local e descrever as principais características de suas ninhadas. Durante quatro temporadas reprodutivas, de 2004 a 2008, foram identificados e monitorados os ninhos encontrados nas praias localizadas entre Uruçuca e Itacaré no litoral sul da Bahia. As variáveis coletadas foram: tamanho de ninhada, duração da incubação, sucesso de eclosão e fases de mortalidade embrionária. Foi registrada uma média de 37 ± 6,2 ninhos por temporada, com maior freqüência de ninhos das espécies Caretta caretta e Eretmochelys imbricata, tendo sido registradas também desovas esporádicas de Chelonia mydas. A temporada de desova de C. caretta ocorre de outubro a janeiro e de E. imbricata de dezembro a março. Este deslocamento temporal das temporadas reprodutivas pode estar relacionado a uma adaptação para minimizar a competição interespecífica. Além da época de nidificação, as duas espécies diferiram no tamanho de suas ninhadas, mas não diferiram na duração da...

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“…Nevertheless, this turtle is currently threatened with extinction, and is classified as an endangered species (IUCN, 2011). Wyneken et al (1988) mentioned that the overall decline in sea turtle populations can be directly or indirectly attributed to the destruction of their habitats, and to anthropic action on the nesting beaches. Moreover, strong evidence suggests that predation of juveniles and eggs, predatory fishing and water pollution contribute towards this risk.…”

Section: Report and Discussionmentioning

confidence: 99%

Marine leech Ozobranchus margoi parasitizing loggerhead turtle (Caretta caretta) in Rio Grande do Sul, Brazil

Rodenbusch

Marks

Canal

et al. 2012

Rev. Bras. Parasitol. Vet.

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Marine leech AbstractThis paper reports the finding of several Ozobranchus margoi (Annelida: Hirudinea) parasitizing a loggerhead turtle (Caretta caretta) that was found in the municipality of Tavares, state of Rio Grande do Sul, southern Brazil. Since this parasite is considered to be a vector of chelonid herpesvirus 5 (ChHV-5), the leeches collected were tested for the presence of this virus. All the specimens were negative on PCR analysis. Although O. margoi is considered to be a common sea turtle parasite, this is the first official record describing collection of this parasite from a loggerhead turtle in southern Brazil, within the country's subtropical zone. This finding draws attention to the presence of this parasite and to the risk of leech-borne infectious diseases among turtles found along the coast of southern Brazil.Keywords: Ozobranchus margoi, Hirudinea, leech, loggerhead turtle, ectoparasite. ResumoEste artigo relata a descoberta de vários exemplares de Ozobranchus margoi (Annelida Hirudínea) parasitando uma tartaruga cabeçuda (Caretta caretta) encontrada no município de Tavares, Rio Grande do Sul, sul do Brasil. Uma vez que esse parasito é considerado vetor do chelonid herpesvirus 5 (ChHV 5), as sanguessugas foram testadas para a presença deste vírus. Todas as amostras foram negativas pela análise de PCR. Embora o O. margoi seja considerado um parasito comum de tartarugas marinhas, este é o primeiro registro oficial que descreve a coleta deste parasita em uma tartaruga cabeçuda no sul do Brasil, dentro da zona subtropical do país. Este achado chama a atenção para a presença deste parasita e para o risco de sanguessugas transmitirem doenças infecciosas em tartarugas no litoral sul do Brasil.

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Egg Failure in Natural and Relocated Sea Turtle Nests

Cited by 123 publications

References 12 publications

Clinical ultrasonography in loggerhead sea turtles (Caretta caretta): imaging of pathological features

Clinical ultrasonography in loggerhead sea turtles (Caretta caretta): imaging of pathological features

Características da reprodução de tartarugas marinhas (Testudines, Cheloniidae) no litoral sul da Bahia, Brasil

Marine leech Ozobranchus margoi parasitizing loggerhead turtle (Caretta caretta) in Rio Grande do Sul, Brazil

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