scholarly journals Strandings of sea turtles on beaches around the oil capital in Brazil

2021 ◽  
Vol 16 (4) ◽  
pp. 521-538
Author(s):  
Raísa da Silva Costa Rêgo ◽  
Eric Azevedo Cazetta ◽  
Caio Henrique Gonçalves Cutrim ◽  
Amanda Soares Miranda ◽  
Ana Paula Albano Araújo ◽  
...  
Keyword(s):  
Sea Turtles ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
The State ◽  
Dermochelys Coriacea ◽  
Anthropogenic Factors ◽  
Long Beach ◽  
Eretmochelys Imbricata ◽  
Lepidochelys Olivacea ◽  
The North

The south-western region of the Atlantic Ocean has feeding and nesting areas for the five species of sea turtles registered in Brazil, which are in different degrees of extinction threat, mainly due to anthropogenic factors. Fishing and the ingestion of solid waste, were identified as causing stranding and the mortality of sea turtles. In this work, data from the monitoring of beaches in the Municipalities of Macaé and Rio das Ostras, important oil zone in Brazil, in the north-central region of the State of Rio de Janeiro, were used in order to analyse the effects of seasonality on the sea turtle stranding. The monitoring was carried out daily from September 2017 to June 2019, in a study area covering 23.8 km long beach. Stranding data were obtained from active (n = 126) and passive (n = 66) monitoring of beaches and included the records of Chelonia mydas (n = 151), Caretta caretta (n = 23), Lepidochelys olivacea (n = 14), Dermochelys coriacea (n = 2) and Eretmochelys imbricata (n = 1). The largest stranding record occurred in the summer (n = 61) and spring (n = 60), a period compatible with the reproductive season of the species. The results obtained in this study emphasise the importance of the analysis of strandings of sea turtles, which provide relevant data on the biology of the group, the intra and interspecific dynamics and the state of conservation of these animals.

scholarly journals First field observation of the predation by Jaguar (Panthera onca) on Olive Ridley sea turtle (Lepidochelys olivacea) at Nancite Beach, Santa Rosa National Park, Costa Rica

2016 ◽  
Vol 3 (1) ◽  
pp. 20-23
Author(s):  
Sergio Escobar-Lasso ◽  
Luis Fonseca ◽  
Wilbert N. Villachica ◽  
Hansel Herrera ◽  
Roldán A. Valverde ◽  
...  
Keyword(s):  
Costa Rica ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Olive Ridley ◽  
Eretmochelys Imbricata ◽  
Lepidochelys Olivacea ◽  
Santa Rosa National Park ◽  
Key Resources

Jaguars have been recorded preying on adult female sea turtles on their nesting beaches in Costa Rica, Guyana, Mexico and Suriname (Fretey 1977, Autar 1994, Cuevas et al. 2014, Guildera et al. 2015). Jaguars prey on Green (Chelonia mydas), Olive Ridley (Lepidochelys olivacea), Hawksbill (Eretmochelys imbricata), and Leatherback (Dermochelys coriacea) sea turtles (see Fretey 1977, Autar 1994, Carrillo et al. 1994, Chinchilla 1997, Tröeng 2000, Heithaus et al. 2008, Veríssimo et al. 2012, Arroyo-Arce et al. 2014, Cuevas et al. 2014, Arroyo-Arce & Salom-Pérez 2015, Guildera et al. 2015). The capture effort and risk of injury associated with the predation of nesting sea turtles is expected to be lower relative to other prey species in the jaguar’s diet (Cavalcanti & Gese 2010). Additionally, they can be key resources when other pr ey availability is low (Veríssimo et al. 2012).

scholarly journals Chelonid Alphaherpesvirus 5 Prevalence and First Confirmed Case of Sea Turtle Fibropapillomatosis in Grenada, West Indies

Animals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1490
Author(s):  
Amanda James ◽  
Annie Page-Karjian ◽  
Kate E. Charles ◽  
Jonnel Edwards ◽  
Christopher R. Gregory ◽  
...  
Keyword(s):  
West Indies ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Neoplastic Disease ◽  
Extrinsic Factors ◽  
Eretmochelys Imbricata ◽  
Specific Pcr ◽  
The Impact

Chelonid alphaherpesvirus 5 (ChHV5) is strongly associated with fibropapillomatosis, a neoplastic disease of sea turtles that can result in debilitation and mortality. The objectives of this study were to examine green (Chelonia mydas), hawksbill (Eretmochelys imbricata), and leatherback (Dermochelys coriacea) sea turtles in Grenada, West Indies, for fibropapillomatosis and to utilize ChHV5-specific PCR, degenerate herpesvirus PCR, and serology to non-invasively evaluate the prevalence of ChHV5 infection and exposure. One-hundred and sixty-seven turtles examined from 2017 to 2019 demonstrated no external fibropapilloma-like lesions and no amplification of ChHV5 DNA from whole blood or skin biopsies. An ELISA performed on serum detected ChHV5-specific IgY in 18/52 (34.6%) of green turtles tested. In 2020, an adult, female green turtle presented for necropsy from the inshore waters of Grenada with severe emaciation and cutaneous fibropapillomas. Multiple tumors tested positive for ChHV5 by qPCR, providing the first confirmed case of ChHV5-associated fibropapillomatosis in Grenada. These results indicate that active ChHV5 infection is rare, although viral exposure in green sea turtles is relatively high. The impact of fibropapillomatosis in Grenada is suggested to be low at the present time and further studies comparing host genetics and immunologic factors, as well as examination into extrinsic factors that may influence disease, are warranted.

Trace metal concentrations in livers and kidneys of sea turtles from south-eastern Queensland, Australia

1998 ◽  
Vol 49 (5) ◽  
pp. 409 ◽  
Author(s):  
A. R. Pople ◽  
A. N. Gordon ◽  
J. Ng
Keyword(s):  
Sea Turtles ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Metal Concentrations ◽  
Eretmochelys Imbricata ◽  
Turtle Species ◽  
Lepidochelys Olivacea ◽  
South Eastern ◽  
Obvious Association ◽  
High Concentrations

The concentrations of some or all of arsenic (As), cadmium (Cd), mercury (Hg), selenium (Se) and zinc (Zn) were determined in the livers and kidneys of 50 stranded sea turtles (38 Chelonia mydas, eight Caretta caretta, three Eretmochelys imbricata, one Lepidochelys olivacea) from the Moreton Bay region of south-eastern Queensland, Australia. Concentrations of Cd, Se and Zn in the kidney tended to decrease with age, whereas concentrations of Zn in the liver tended to increase. Concentrations of Cd in all sea turtle species (1.7–75.9 µg g-1 wet weight) were amongst the highest recorded for marine vertebrates globally. Although there was no obvious association between metal concentrations and particular diseases in C. mydas, the high concentrations of Cd found in edible turtle tissues may pose a threat to the health of indigenous people whose diet includes C. mydas.

scholarly journals Checklist of sea turtles endohelminth in Neotropical region

2016 ◽  
Vol 53 (3) ◽  
pp. 211-223 ◽  
Author(s):  
M. R. Werneck ◽  
R. J. Da Silva
Keyword(s):  
Sea Turtles ◽  
Loggerhead Turtle ◽  
Chelonia Mydas ◽  
Neotropical Region ◽  
Dermochelys Coriacea ◽  
Olive Ridley ◽  
Eretmochelys Imbricata ◽  
Leatherback Turtle ◽  
Lepidochelys Olivacea ◽  
The Caribbean

SummaryThis paper presents a list of parasites described in sea turtles from the Neotropical region. Through the review of literature the occurrence of 79 taxa of helminthes parasites were observed, mostly consisting of the Phylum Platyhelminthes with 76 species distributed in 14 families and 2 families of the Phylum Nematoda within 3 species. Regarding the parasite records, the most studied host was the green turtle (Chelonia mydas) followed by the hawksbill turtle (Eretmochelys imbricata), olive ridley turtle (Lepidochelys olivacea), loggerhead turtle (Caretta caretta) and leatherback turtle (Dermochelys coriacea). Overall helminths were reported in 12 countries and in the Caribbean Sea region. This checklist is the largest compilation of data on helminths found in sea turtles in the Neotropical region.

scholarly journals Sea turtles of Madagascar – their status, exploitation and conservation

Oryx ◽  
1994 ◽  
Vol 28 (1) ◽  
pp. 51-61 ◽  
Author(s):  
Berthin Rakotonirina ◽  
Andrew Cooke
Keyword(s):  
Coastal Waters ◽  
Sea Turtles ◽  
Loggerhead Turtle ◽  
Chelonia Mydas ◽  
Dermochelys Coriacea ◽  
Olive Ridley ◽  
Eretmochelys Imbricata ◽  
Lepidochelys Olivacea ◽  
Average Size ◽  
Hawksbill Turtles

Five species of sea turtles are known from Madagascar's coastal waters. Fishermen on the western and south-western coasts take green turtle Chelonia mydas, loggerhead turtle Caretta caretta and olive ridley Lepidochelys olivacea for their meat. The hawksbill turtle Eretmochelys imbricata is taken mainly for its shell and for making stuffed specimens while the leatherback Dermochelys coriacea is seldom caught. Anecdotal evidence of fishermen and dealers in turtle products, measurement of captured animals and personal observations of the authors all point to declines in numbers and average size for green and hawksbill turtles, coupled with marked declines in nesting rates for these and the olive ridley.

Estimating past and present sex ratios of sea turtles in Suriname

1996 ◽  
Vol 74 (2) ◽  
pp. 267-277 ◽  
Author(s):  
Matthew H. Godfrey ◽  
N. Mrosovsky ◽  
R. Barreto
Keyword(s):  
Sea Turtles ◽  
Sex Ratios ◽  
Negative Relationship ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Green Turtles ◽  
Sand Temperature ◽  
Turtle Conservation ◽  
Sea Turtle Conservation

Leatherback (Dermochelys coriacea) and green (Chelonia mydas) sea turtles in Suriname lay eggs over several months of the year. During this nesting season, changes in rainfall produce changes in sand temperature, which in turn influence the sexual differentiation of incubating sea turtle embryos. The overall sex ratio of leatherback and green sea turtle hatchlings produced at Matapica beach in Suriname was investigated. Estimates of the sex ratios of these turtles in 1993 (green turtles 63.8% female, leatherbacks 69.4% female) were roughly 10% more female-biased than those from an earlier study in 1982. For both species, a significant negative relationship was found between monthly rainfall and monthly sex ratios. Using this relationship and data on rainfall in the past, it was possible to estimate overall sex ratios for an additional 12 years. These estimates varied considerably among different years, ranging from 20 to 90% female in the case of green turtles. Nevertheless, males tended to be produced primarily in April and May, while some females were produced in all months. Such seasonal patterns of production of turtles of different sexes have implications for sea turtle conservation programs that involve manipulating or harvesting eggs.

scholarly journals PERFIL EPIDEMIOLÓGICO DA FIBROPAPILOMATOSE EM TARTARUGAS-MARINHAS ENCALHADAS ENTRE O LITORAL SUL DE ALAGOAS E NORTE DA BAHIA, NORDESTE DO BRASIL

2017 ◽  
Vol 20 (2) ◽  
Author(s):  
Leticia Koproski ◽  
Órion Pedro da Silva ◽  
Caio Alexandre Maciel Santos ◽  
Andrei Manoel Brum Febrônio ◽  
Fábio Teles de Santana ◽  
...  
Keyword(s):  
Chelonia Mydas ◽  
Caretta Caretta ◽  
Dermochelys Coriacea ◽  
Eretmochelys Imbricata ◽  
Lepidochelys Olivacea

Em um intervalo de quatro anos, a prevalência da fibropapilomatose em tartarugas encalhadas em uma região do nordeste do Brasil compreendida entre o sul de Alagoas e o norte da Bahia foi de 16% em Chelonia mydas, 2% em Caretta caretta e 0,6% em Lepidochelys olivacea. C. mydas acometidas apresentaram biometria média de 0,49m de Comprimento Curvilíneo da Carapaça - CCC. Machos e fêmeas foram igualmente acometidos, numa média de 22%. Pela análise de 1231 registros fotográficos, a média foi de 13 tumores por C. mydas. Nessa espécie 76,77% dos tumores foram registrados na parte anterior do corpo, 17,97% na região posterior, 4,12% na carapaça e plastrão e 1,0% nos globos oculares. Não foram registrados tumores na cavidade oral. C. mydas foram em sua maioria moderadamente afetadas pela doença. L. olivacea acometida apresentou biometria média de 0,69m de CCC. Machos e fêmeas foram atingidas numa média de 1,0%. Os tumores em L. olivacea foram observados na porção anterior e posterior do corpo. Somente um indivíduo do sexo masculino de C. caretta, com biometria de 1,03m de CCC apresentou sinal da doença. A C. caretta apresentava um tumor externo pedunculado na região cervical, de tamanho entre 1,1cm e 4,0cm de diâmetro. As prevalências da fibropapilomatose em Eretmochelys imbricata e Dermochelys coriacea foram de 0,0%. A prevalência da fibropapilomatose em C. mydas segue padrões encontrados para a costa brasileira. No entanto, a doença se manifesta com severidade levemente superior a encontrada no litoral da região sudeste do país.

scholarly journals MARES E TARTARUGAS VERDES: ANÁLISE DE ENCALHES DE CHELONIA MYDAS NO LITORAL DE FORTALEZA

2021 ◽  
Author(s):  
Arthur José Cavalcante Gois ◽  
Ívina Leal Dos Santos
Keyword(s):  
Chelonia Mydas ◽  
Caretta Caretta ◽  
Dermochelys Coriacea ◽  
Eretmochelys Imbricata ◽  
Lepidochelys Olivacea

Introdução: O Instituto Verdeluz é uma ONG ambientalista que atua na cidade de Fortaleza e região metropolitana, contendo 4 projetos. Um destes projetos é o GTAR, que atua na pesquisa e conservação com as cinco espécies de tartarugas marinhas que ocorrem no litoral brasileiro, sendo elas Tartaruga-Verde (Chelonia Mydas), Tartaruga-de-Pente (Eretmochelys imbricata), Tartaruga-de-Couro (Dermochelys coriácea), Tartaruga-Oliva (Lepidochelys olivácea) e Tartaruga-Cabeçuda (Caretta caretta). Ainda que em diferentes níveis, estas espécies são classificas como ameaçadas, sendo a Tartaruga-Verde, objeto de estudo deste projeto, classificada como vulnerável e em perigo, segundo o Ministério do Meio Ambiente (MMA) e União Internacional para a Conservação da Natureza e dos Recursos Naturais (IUCN), respectivamente. Estes animais são conhecidos por sua migração entre áreas de alimentação, reprodução e nidificação, sendo o litoral Cearense utilizado principalmente na alimentação e ovoposição. Objetivo: O presente estudo visou analisar os encalhes de Chelonia mydas no litoral de Fortaleza, afim de fomentar práticas de conservação da espécie e indicar características de praias e da espécie que aumentam as chances de encalhes. Material e Métodos: Foram utilizados metadados coletados pelo Instituto Verdeluz entre 2016 e 2018, sendo eles: data, horário e local do encalhe, medidas de tamanho (largura e comprimento do casco), sexo (masculino, feminino ou indefinido), faixa etária (filhote, juvenil ou adulto) e estado do indivíduo, totalizando 48 ocorrências. Através do programa BioEstat, foram realizadas análises de distribuição e correlação entre os dados da ocorrência e as características das praias no momento do encalhe. RESULTADOS: Os resultados apontaram que fêmeas tem maior probabilidade de encalharem do que os machos e os indivíduos sexo indefinido. A localização do encalhe nas praias de Fortaleza não causa uma alteração significativa no número de encalhes, uma vez que todas possuem grau de proximidade e formações arenosas semelhantes. A maré e o tamanho do casco influenciam diretamente no número de encalhes, pois ambos dificultam a volta do animal para o mar. Conclusão: Projetos de pesquisa e conservação sobre tartarugas marinhas, como o GTAR-Verdeluz, mostram-se essenciais para a conservação da espécie, pois o conhecimento mais profundo das ameaças a espécie nos permite realizar atividades de conservação mais eficazes.

scholarly journals Occurrence of sea turtles during seismic surveys in Northeastern Brazil

2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Cristiano Leite Parente ◽  
Juliana Doyle Lontra ◽  
Maria Elisabeth de Araújo
Keyword(s):  
Sea Turtles ◽  
Low Frequency ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Reproductive Period ◽  
Northeastern Brazil ◽  
Seismic Survey ◽  
Shallow Waters ◽  
Seismic Surveys ◽  
Lepidochelys Olivacea

There are seven species of sea turtles around the world. Among these, five visit the northeast coast of Brazil to reproduce and feed. These sea turtles are impacted by human activity and need conservation measures. The seismic survey is one of these activities due to its high intensity and low frequency sound emissions in the marine environment. Records of sea turtles during seismic surveys in shallow waters of the northeast of Brazil between 2002 and 2003 are presented in this study with some discussion about the effectiveness of the monitoring procedures. Three species of sea turtle were recorded within the seismic survey areas. The Chelonia mydas species was the most commonly sighted turtle. There was only one record of Caretta caretta and Lepidochelys olivacea. The presence of sea turtles in Sergipe state was linked to the reproductive period while this pattern was not observed in Ceará state. The absence of information about distribution and abundance of sea turtles in the surveyed areas previous to and after the seismic surveys, as well as numerous incomplete data make it hard to identify the effect of seismic surveys on those factors and also sea turtle behaviors.

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