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 Effectiveness of Sea Turtle Conservation Management at the Turtle Conservation and Education Center of Serangan, Denpasar Bali

2021 ◽  
Vol 10 (1) ◽  
pp. 18
Author(s):  
Taurus Zeno Adi Eti Harnino ◽  
I Nyoman Yoga Parawangsa ◽  
Luthfiana Aprilianita Sari ◽  
Sulastri Arsad
Keyword(s):  
Sea Turtles ◽  
Marine Ecosystem ◽  
Sea Turtle ◽  
Sand Temperature ◽  
Observation Methods ◽  
Turtle Conservation ◽  
Sea Turtle Conservation ◽  
Nest Depth ◽  
Turtle Population ◽  
The Government

Turtles are one of the reptile animals that can migrate long distances along the Indian Ocean, Pacific Ocean and Southeast Asia. The purpose of turtle migration is to mate, find spawning locations and to find food. Sea turtles have an important role in maintaining the balance of the marine ecosystem. However, the high utilization of sea turtles by humans causes the turtle population to decline. One of the conservation sites that help the government program is in Serangan, Denpasar Bali, namely the TCEC (Turtle Conservation and Education Center), where there are several types of turtles such as the lekang turtle, hawksbill and green turtle. Data collection techniques in this study used observation methods including beach monitoring, relocation of turtle eggs to semi-natural hatchery hatching, hatchling and turtle nesting as well as measurement of turtle length and width carapase curve (CCL/CCW), sand temperature, nest depth, nest diameter, nest distance and nest calculation of the number of eggs to see the success of hatching. The results are turtle conservation activities, ranging from turtle maintenance, hatching of turtle eggs, relocation of eggs, and maintenance of hatchlings to release turtles. The effectiveness given by TCEC to manage and preserve the existence of sea turtles in Indonesia, especially in the Bali region is to provide awareness to the community by not consuming eggs and turtle meat.

scholarly journals Fisheries bycatch reduction within the least-cost biodiversity mitigation hierarchy: Conservatory offsets with an application to sea turtles

2018 ◽  
Author(s):  
Dale Squires ◽  
Victor Restrepo ◽  
Serge Garcia ◽  
Peter Dutton
Keyword(s):  
Sea Turtles ◽  
Sea Turtle ◽  
Impact Mitigation ◽  
Bycatch Reduction ◽  
Conservation Programme ◽  
Mitigation Hierarchy ◽  
Turtle Conservation ◽  
Sea Turtle Conservation ◽  
Fisheries Bycatch

This paper considers fisheries bycatch reduction within the least-cost biodiversity impact mitigation hierarchy. It introduces conservatory offsets that are implemented earlier in the biodiversity impact mitigation hierarchy than conventional compensatory offsets used as instruments of last resort. The paper illustrates implementation in an on-going sea turtle conservation programme by the International Seafood Sustainability Foundation.

Diet selection by immature green turtles (Chelonia mydas) at Bahía Magdalena foraging ground in the Pacific Coast of the Baja California Peninsula, México

2008 ◽  
Vol 88 (3) ◽  
pp. 641-647 ◽  
Author(s):  
Milagros López-Mendilaharsu ◽  
Susan C. Gardner ◽  
Rafael Riosmena-Rodriguez ◽  
Jeffrey A. Seminoff
Keyword(s):  
Baja California ◽  
Gastric Lavage ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Baja California Peninsula ◽  
Green Turtles ◽  
Turtle Conservation ◽  
The Pacific ◽  
Preferred Species ◽  
Conservation Plans

In order to determine if eastern Pacific green turtles (Chelonia mydas) exhibit feeding preferences samples of recently ingested food items were compared to the food resources available in the marine environment where C. mydas congregates. Stomach samples were collected by conducting gastric lavage and, at the same time, vegetation transects were conducted during spring and winter. Green turtles in our study selectively consumed seaweeds, with Codium amplivesiculatum and Gracialaria textorii as preferred species. Differences in the consumption of species were found across the two mentioned seasons and were consistent with changes in the availability of different algae species in the environment. Based on these results, it is recommended that sea turtle conservation plans along the Baja California Peninsula include Pacific coastal mangrove channels with a high diversity of algae species as priority areas for protection.

scholarly journals An Examination of an Opportunity for Collaboration Among Stakeholders to Promote Conservation in Sea Turtle Tourism in Gilli Trawangan, Indonesia

2021 ◽  
Author(s):  
Allison Anne McCabe
Keyword(s):  
Sea Turtles ◽  
Sustainable Tourism ◽  
Tourism Development ◽  
Sea Turtle ◽  
Small Island ◽  
Small Islands ◽  
Stakeholder Collaboration ◽  
Turtle Conservation ◽  
Sea Turtle Conservation ◽  
The Impact

All species of sea turtles are globally endangered, largely due to the impact of unsustainable tourism. Gili Trawangan, a small island, depends on marine tourism and has an abundant population of sea turtles. Stakeholder collaboration is often used to promote sustainable tourism development and sea turtle conservation. This study examined stakeholder collaboration to promote conservation in sea turtle tourism in small islands by exploring a case study in Gili Trawangan, Indonesia. The study was conducted in 2010. It applied qualitative research methods to expand the knowledge of collaboration in the development of sustainable tourism in small islands. Stakeholder analysis helped to reveal barriers to and influences on tourism development to help promote sea turtle conservation and protect the livelihoods of local communities. Key findings are that education, financial considerations, management structure, regulatory conflict, a disconnect to the island, and stakeholder conflict are factors that influenced stakeholder collaboration in Gili Trawangan.

scholarly journals Stakeholder perception on the Sea Turtle conservation in the Gili Matra Tourism Area, Lombok, West Nusa Tenggara

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Ahmad Jupri ◽  
Baiq Riyan Anggriani Putri ◽  
Hilman Ahyadi ◽  
Yuliadi Zamroni
Keyword(s):  
Habitat Quality ◽  
Technical Assistance ◽  
Local Community ◽  
Group Discussion ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Conservation Action ◽  
Turtle Conservation ◽  
Sea Turtle Conservation ◽  
Turtle Population

The conservation of sea turtles in a nature-based tourism area is significant to enhance sustainability of the sea turtle population in the wild. Small islands in Lombok Island chains, the Gili Matra, are one of the significant habitats for turtles, and the island is recognized as one of the islands with fastest tourism growth in Indonesia. The research aims to explore the stakeholders’ perspectives in sea turtle conservation in Gili Matra, Lombok. Focus group discussion was implemented to identify the stakeholder perspective. Literature survey was carried out to generate related data concerning sea turtle population and its habitat quality in Gili Matra. The result of this study indicates that stakeholders can identify three species of sea turtle in Gili Matra waters, namely the green sea turtle (Chelonia mydas), the Hawksbill Turtle (Eretmochelys imbricate), and the ridley sea turtle (Lepydochely olivacea). Stakeholders state that between 1990 and 2017, there was reduction in the population size in Gili Matra. Factors related to the decrease of population in Gili Matra include decrease of habitat quality and human activity. Some recommendations were made, including increasing socialization and campaign, providing tools and facility to support conservation action, controlling unsustainable practice of fish collection, strengthening the implementation of regulation, and providing training and technical assistance to the local community and local office.

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.

scholarly journals Local community involvement in conservation—the use of mini-guides in a programme for sea turtles in Brazil

Oryx ◽  
1999 ◽  
Vol 33 (2) ◽  
pp. 127-131 ◽  
Author(s):  
Claudia F. Vieitas ◽  
Gustave G. Lopez ◽  
Maria A. Marcovaldi
Keyword(s):  
Community Involvement ◽  
Local Community ◽  
Sea Turtles ◽  
Sea Turtle ◽  
Economic Benefits ◽  
Environmental Conservation ◽  
Approval Ratings ◽  
Turtle Conservation ◽  
Sea Turtle Conservation ◽  
Alternative Sources

AbstractThe Brazilian Sea Turtle Conservation Programme (TAMAR) was established in 1980 to protect sea turtles in Brazil and to re-establish their natural life cycle, which had been disrupted by humans. The programme is based on grassroots involvement by the coastal communities, and provides jobs and generates alternative sources of income. Within this framework, the mini-guides programme was created. It consists of a summer training course in which local children between 8 and 13 years old learn basic information about marine ecosystems and sea turtles, strategies to promote their conservation, and skills to interact effectively with tourists. After the course, children are given onsite experience by working as interns at the TAMAR visitor centre at Praia do Forte, on schedules designed to avoid conflicts with their studies at school. The children work closely with tourists, informing them about sea turtles and TAMAR's work; they also help the biologists in field activities. In this way, they enhance their own awareness, and by extension their families' and the community's concern about environmental conservation. Their involvement provides them not only with valuable skills, but also an extra source of income, thereby providing economic benefits to their families. The success of this programme is indicated by the excellent approval ratings given by the tourists visiting the area.

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 An Examination of an Opportunity for Collaboration Among Stakeholders to Promote Conservation in Sea Turtle Tourism in Gilli Trawangan, Indonesia

2021 ◽  
Author(s):  
Allison Anne McCabe
Keyword(s):  
Sea Turtles ◽  
Sustainable Tourism ◽  
Tourism Development ◽  
Sea Turtle ◽  
Small Island ◽  
Small Islands ◽  
Stakeholder Collaboration ◽  
Turtle Conservation ◽  
Sea Turtle Conservation ◽  
The Impact

All species of sea turtles are globally endangered, largely due to the impact of unsustainable tourism. Gili Trawangan, a small island, depends on marine tourism and has an abundant population of sea turtles. Stakeholder collaboration is often used to promote sustainable tourism development and sea turtle conservation. This study examined stakeholder collaboration to promote conservation in sea turtle tourism in small islands by exploring a case study in Gili Trawangan, Indonesia. The study was conducted in 2010. It applied qualitative research methods to expand the knowledge of collaboration in the development of sustainable tourism in small islands. Stakeholder analysis helped to reveal barriers to and influences on tourism development to help promote sea turtle conservation and protect the livelihoods of local communities. Key findings are that education, financial considerations, management structure, regulatory conflict, a disconnect to the island, and stakeholder conflict are factors that influenced stakeholder collaboration in Gili Trawangan.

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