scholarly journals Monitoring the green turtle population Chelonia mydas (Linné, 1758) in the coastal region of Campo Ma’an national park (South Cameroon)

2012 ◽  
Vol 6 (2) ◽  
Author(s):  
A Hyacinthe ◽  
A Akoa ◽  
J Fretey ◽  
A Formia
Keyword(s):  
Green Turtle ◽  
National Park ◽  
Coastal Region ◽  
Chelonia Mydas ◽  
Turtle Population

Structural description of sea turtle fibropapilloma

2020 ◽  
Vol 13 (3) ◽  
pp. 585-591
Author(s):  
Luana Melo ◽  
Isabel Velasco ◽  
Julia Aquino ◽  
Rosangela Rodrigues ◽  
Edris Lopes ◽  
...  
Keyword(s):  
Green Turtle ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Tumor Formation ◽  
Neoplastic Disease ◽  
Structural Description ◽  
Chemical Carcinogens ◽  
Epidermal Proliferation ◽  
Turtle Population ◽  
Bulky Mass

Fibropapillomatosis is a neoplastic disease that affects sea turtles. It is characterized by multiple papillomas, fibropapillomas and cutaneous and/or visceral fibromas. Although its etiology has not been fully elucidated, it is known that there is a strong involvement of an alpha - herpesvirus, but the influence of other factors such as parasites, genetics, chemical carcinogens, contaminants, immunosuppression and ultraviolet radiation may be important in the disease, being pointed out as one of the main causes of a reduction in the green turtle population. Thus, the objective of this article was to describe the morphology of cutaneous fibropapillomas found in specimens of the green turtle (Chelonia mydas), using light and scanning electron microscopy in order to contribute to the mechanism of tumor formation. Microscopically, it presented hyperplastic stromal proliferation and epidermal proliferation with hyperkeratosis. The bulky mass was coated with keratin, with some keratinocyte invaginations, that allowed the keratin to infiltrate from the epidermis into the dermis, forming large keratinized circular spirals. Another fact that we observed was the influence of the inflammation of the tumors caused by ectoparasites.

scholarly journals The Recent Nesting Record of Female Green Turtle, Chelonia mydas, at Pamban, Gulf of Mannar

2014 ◽  
Vol 6 (4) ◽  
pp. 414-416
Author(s):  
Vellathi VENKATESAN ◽  
Chellapa KALIDAS
Keyword(s):  
Green Turtle ◽  
Monsoon Season ◽  
High Tide ◽  
Chelonia Mydas ◽  
Gulf Of Mannar ◽  
Important Place ◽  
Continuous Mixing ◽  
Nesting Site ◽  
Turtle Population ◽  
Egg Diameter

A female green turtle was sighted at Pamban along the Gulf of Mannar just after the nesting on the beach on 15th January 2011. Morphometric measurements of the turtle were taken and data suggests that this individual is adult. A total number of laid eggs were 109. The distance between the nesting site and the high tide line was found to be 7 m. The depth and diameter of the nesting pit was 52 and 16 cm, whereas the mean egg diameter and weight were found to be 44.3 mm and 40.5 g respectively. Pamban coast may also be considered an important place for nesting, because of the continuous mixing of waters of GOM and Palk Bay areas, which in turn create current patterns continuously throughout the year in addition to the monsoon season. Conservation of nesting habitat along Gulf of Mannar will be important to maintain the green turtle population.

Using Animal-Borne Imaging to Assess Green Turtle (Chelonia mydas) Foraging Ecology in Moreton Bay, Australia

2007 ◽  
Vol 41 (4) ◽  
pp. 9-13 ◽  
Author(s):  
Karen E. Arthur ◽  
Judith M. O'Neil ◽  
Colin J. Limpus ◽  
Kyler Abernathy ◽  
Greg Marshall
Keyword(s):  
Feeding Ecology ◽  
Green Turtle ◽  
Foraging Ecology ◽  
Chelonia Mydas ◽  
Lyngbya Majuscula ◽  
Imaging Device ◽  
Green Turtles ◽  
Moreton Bay ◽  
Turtle Population ◽  
Insight Into

Traditional techniques for studying green turtle foraging ecology, such as the analysis of food availability and ingested dietary material, have concluded that green turtles are primarily herbivorous but selective foragers. However, green turtles that forage during Lyngbya majuscula blooms are exposed to toxins produced by the cyanobacterium overgrowing the seagrass. We used the Crittercam, an animal-borne imaging device, to observe green turtle foraging behavior in Moreton Bay, Australia, and to evaluate the system for assessing the impacts of Lyngbya blooms on green turtles. Eight large green turtles were captured while foraging on seagrass flats and each was fitted with a Crittercam. The deployments yielded over 28 hours of video and associated time-depth records. Turtles swam almost continuously and rarely stopped to feed on seagrass. Six turtles were observed feeding and all six consumed gelatinous animals from the water column. This prey source was previously undocumented in the Moreton Bay green turtle population but described in other green turtle populations using the Crittercam. Only one turtle was observed foraging on seagrass. The results of this study indicate that Crittercam technology can provide insight into turtle diet selection and that it will be a useful tool in identifying the impacts of Lyngbya blooms on green turtle feeding ecology. This study has also demonstrated that turtles in Moreton Bay may have a more flexible diet than previously described, indicating they could potentially supplement their diet with alternate prey items when seagrass quality or quantity is compromised. Longer deployment times, with an initial acclimation phase, are required to more fully understand questions pertaining to feeding ecology.

scholarly journals Population dynamic between vulnerable coastal jaguars (Panthera onca) and endangered green sea turtles (Chelonia mydas) in Tortuguero National Park, Costa Rica.

2018 ◽  
Author(s):  
Stephanie Butera ◽  
Jaime Restrepo
Keyword(s):  
National Park ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Predator Prey ◽  
Green Sea Turtles ◽  
Turtle Population ◽  
Nest Depredation ◽  
The Impact ◽  
Nest Predators

New-born sea turtles face a number of predators between the time the mothers lay eggs on the beach to when the hatchlings grow into larger juveniles. Nest depredation impacts reproductive success of nesting sea turtles, reducing the number of new turtles that make it to the sea. On Tortuguero beach nest predators include; dogs, coati, and raccoons. Nest depredation within Tortuguero National Park (TNP) has decreased dramatically since 1979. This decrease in nest depredation is linked to the increased jaguar population within TNP as the aforementioned species are considered the jaguars natural prey. Although jaguars prey on nesting turtles, they also control the populations of nest predators. Even more, jaguars have been demonstrated to change their behaviour to suit their preference in prey species therefore the nest predator distribution in TNP was examined to investigate whether changes in jaguar prey preference had an effect. Nest predation and the number of adult turtles lost to jaguar depredation were examined to determine the significance of the threat jaguars pose to the sea turtle population. This study investigates the predator prey relationship between jaguars, nest predators, and nesting female sea turtles; aiming to assessing the impact that jaguars have on the turtle's population.

scholarly journals Genetic diversity of the Green Turtle (Testudines: Cheloniidae: Chelonia mydas (Linnaeus, 1758)) population nesting at Kosgoda Rookery, Sri Lanka

2017 ◽  
Vol 9 (6) ◽  
pp. 10261
Author(s):  
E. M.L. Ekanayake ◽  
T. Kapurusinghe ◽  
M. M. Saman ◽  
D. S. Rathnakumara ◽  
P. Samaraweera ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Sri Lanka ◽  
Green Turtle ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
High Genetic Diversity ◽  
Tissue Samples ◽  
Hardy Weinberg Equilibrium ◽  
Turtle Population ◽  
The Mean

We determined the genetic diversity of the Green Turtle Chelonia mydas (Linneaus, 1758) nesting at Kosgoda rookery, the second largest sea turtle aggregation on the southwestern coast of Sri Lanka.  Skin tissue samples were collected from 68 nesting females and genetic diversity was estimated using six microsatellite loci.  High genetic diversity was observed within the population as all loci analyzed were highly polymorphic with a total of 149 alleles observed.  The mean number of alleles per locus was 24.7 and the mean observed and expected heterozygosity across all loci were 0.75 and 0.93, respectively.  It appears that five out of six loci were not in Hardy-Weinberg equilibrium, while micro-checker analysis suggested that the Kosgoda Green Turtle population was possibly in equilibrium.  The viability of a population is unlikely to be reduced if high genetic diversity is maintained within it.  Although the Green Turtle population nesting at Kosgoda is small compared to other nesting rookeries in the world, the high genetic diversity observed suggests that the population may not be undergoing a bottleneck.

scholarly journals Morphophysiological Analysis of Keratobranchial Bone II located in the Hyoid of the Green Turtle (Chelonias mydas) found in Peruíbe, South Coast of Brazil, Mosaic of Conservation Units-Juréia-Itatins and APACIP

2021 ◽  
Vol 1 (4) ◽  
pp. 120-130
Author(s):  
Edris Queiroz Lopes ◽  
Tatiane Gonçalves De Lima ◽  
Luana Félix De Melo ◽  
Rose Eli Grassi Rici
Keyword(s):  
Green Turtle ◽  
Bone Structure ◽  
Eating Habits ◽  
Coastal Region ◽  
Chelonia Mydas ◽  
Conservation Units ◽  
Green Turtles ◽  
Small Bones ◽  
High Level ◽  
Microscopy Techniques

The green turtle (Chelonia mydas) present in tropical seas, uses as a feeding area the coastal region of Peruíbe, has the skull as a relatively large and solid structure, and a strong jaw formed by the junction of small bones as it has very abrasive feeding. By applying scanning electron microscopy techniques, it was possible to identify the presence of a bone structure located in the hyoid in the ventral region of the skull along with the mandible of juvenile individuals of green turtles, and as there is no related research, it was necessary to perform a CT scan, decalcification and histology of the quelonian hyoid, to discover the morphological composition of this new structure, described only in the species Chelonia mydas. Thus, the morphology of the structures and its confirmation as a real bone, with characteristic of spongy bone, described as certobranchial II, was confirmed, thus helping researchers to seek other ways to understand the feeding processes of these animals that are going through a series of serious environmental problems and therefore perhaps having to change their eating habits to overcome the high level of pollution that we are finding in the oceans.   RESUMO A tartaruga verde (Chelonia mydas) presente nos mares tropicais, utiliza como zona de alimentação a região costeira do Peruíbe, tem o crânio como uma estrutura relativamente grande e sólida, e uma mandíbula forte formada pela junção de pequenos ossos, uma vez que tem uma alimentação muito abrasiva. Aplicando técnicas de microscopia electrónica de varrimento, foi possível identificar a presença de uma estrutura óssea localizada no hióide na região ventral do crânio, juntamente com a mandíbula de indivíduos juvenis de tartarugas verdes, e como não existe investigação relacionada, foi necessário realizar um TAC, descalcificação e histologia do hióide quelónico, para descobrir a composição morfológica desta nova estrutura, descrita apenas na espécie Chelonia mydas. Assim, a morfologia das estruturas e a sua confirmação como um osso real, com característica de osso esponjoso, descrito como certobranchial II, foi confirmada, ajudando assim os investigadores a procurar outras formas de compreender os processos de alimentação destes animais que estão a passar por uma série de graves problemas ambientais e, por conseguinte, talvez tenham de alterar os seus hábitos alimentares para superar o elevado nível de poluição que estamos a encontrar nos oceanos.

Green turtle mitochondrial microsatellites indicate finer-scale natal homing to isolated islands than to continental nesting sites

2020 ◽  
Vol 643 ◽  
pp. 159-171 ◽  
Author(s):  
BM Shamblin ◽  
KM Hart ◽  
KJ Martin ◽  
SA Ceriani ◽  
DA Bagley ◽  
...  
Keyword(s):  
Green Turtle ◽  
National Park ◽  
Mitochondrial Control Region ◽  
Chelonia Mydas ◽  
Great Promise ◽  
Natal Philopatry ◽  
Dry Tortugas ◽  
Key West ◽  
Natal Homing ◽  
Nesting Sites

In highly mobile philopatric species, defining the scale of natal homing is fundamental to characterizing population dynamics and effectively managing distinct populations. Genetic tools have provided evidence of regional natal philopatry in marine turtles, but extensive sharing of maternally inherited mitochondrial control region (CR) haplotypes within regions (<500 km) often impedes identification of population boundaries. Previous CR-based analyses of Florida (USA) green turtle Chelonia mydas nesting sites detected at least 2 populations, but the ubiquity of haplotype CM-A3.1 among southern rookeries decreased the power to detect differentiation. We reassessed population structure by sequencing the mitochondrial microsatellite (short tandem repeat, mtSTR) in 786 samples from 11 nesting sites spanning 700 km from Canaveral National Seashore through Dry Tortugas National Park. The mtSTR marker subdivided CM-A3.1 into 12 haplotypes that were structured among rookeries, demonstrating independent female recruitment into the Dry Tortugas and Marquesas Keys nesting populations. Combined haplotypes provided support for recognition of at least 4 management units in Florida: (1) central eastern Florida, (2) southeastern Florida, (3) Key West National Wildlife Refuge, and (4) Dry Tortugas National Park. Recapture data indicated female nesting dispersal between islands <15 km apart, but haplotype frequencies demonstrated discrete natal homing to island groups separated by 70 km. These isolated insular rookeries may be more vulnerable to climate change-mediated nesting habitat instability than those along continental coasts and should be monitored more consistently to characterize population status. Broader application of the mtSTR markers holds great promise in improving resolution of stock structure and migratory connectivity for green turtles globally.

scholarly journals Pengaruh Kedalaman Sarang Penetasan Penyu Hijau (Chelonia mydas) terhadap Masa Inkubasi dan Persentase Keberhasilan Penetasan di Pantai Sukamade, Taman Nasional Meru Betiri, Banyuwangi Jawa Timur [Effect of Nesting Site Depth of Green Turtle (Chelonia mydas) on the Incubation Period and Hatching Success Percentage in Sukamade Beach, Meru Betiri National Park, Banyuwangi in East Java]

2019 ◽  
Vol 7 (2) ◽  
pp. 195
Author(s):  
Abang Aldhian R. Putera ◽  
Laksmi Sulmartiwi ◽  
Wahju Tjahjaningsih
Keyword(s):  
Incubation Period ◽  
Green Turtle ◽  
National Park ◽  
Hatching Success ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
The Other ◽  
Green Turtles ◽  
Egg Incubation ◽  
Range Test

Abstract Indonesia is an archipelago that is rich in diversity of flora and fauna. One of these is a wealth of fauna species of sea turtles. All species of sea turtles in the world by the Convention on International Trade in Endangered Species of Wild Flora and Fauna (CITES) put in Appendix I as endangered and protected and not allowed to be traded. The purpose of this study was to determine effect the ratio of the depth from nest egg incubation and hatching percentage of green turtles (Chelonia mydas) nests at different depths in Sukamade, Betiri Meru National Park, Banyuwangi, East Java. The design of the study is a randomized block design (RGD). The groups as replicates for RGD, between groups or experimental material media are considered uniform. The results showed that the average incubation period was 58.87 +0.39 days, then the results were followed by Duncan's multiple range test, which showed that the highest yield obtained by the depth of 50 cm wasn’t significantly different (p> 0.05) with depth of 30 cm and 70 cm. While the results obtained at the lowest depth of 90 cm was significantly different (p <0.05) with the other depth (30 cm, 50 cm and 70 cm). While the percentage of hatching success obtained in average hatching was 88.12 + 0.38%. The Duncan's multiple range test analysis, showed that at a depth of 70 cm were not significantly different (p <0.05) from depth of 50 cm, but 70 and 50 cm depth was significantly different (p> 0.05) from another depth. Whereas the lowest hatching results obtained on depth of 90 cm are significantly different (p> 0.05) from the other depth (30 cm, 50 cm and 70 cm). The conclusion of this study was different depth of green turtle nests affect the egg incubation period and the percentage of egg hatching success of green turtles.

Sign in / Sign up

Export Citation Format

Share Document