scholarly journals Hatching and emergence success in green turtle Chelonia mydas nests in the Galápagos Islands

2013 ◽  
Vol 19 (3) ◽  
pp. 217-229 ◽  
Author(s):  
P Zárate ◽  
KA Bjorndal ◽  
M Parra ◽  
PH Dutton ◽  
JA Seminoff ◽  
...  
Keyword(s):  
Green Turtle ◽  
Chelonia Mydas ◽  
Galapagos Islands ◽  
Galápagos Islands ◽  
Emergence Success

Feeding ecology of the green sea turtle (Chelonia mydas) in the Galapagos Islands

2010 ◽  
Vol 90 (5) ◽  
pp. 1005-1013 ◽  
Author(s):  
Javier A. Carrión-Cortez ◽  
Patricia Zárate ◽  
Jeffrey A. Seminoff
Keyword(s):  
Feeding Ecology ◽  
Green Turtle ◽  
Warm Season ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Cold Season ◽  
Galapagos Islands ◽  
Scaling Analysis ◽  
Galápagos Islands ◽  
Green Sea Turtle

The Galapagos Islands are among the most important nesting areas for the green sea turtle, Chelonia mydas, in the eastern Pacific Ocean. In addition, the coastal waters of this oceanic archipelago host many important feeding areas for this species, although little is known about green turtle feeding ecology at these sites. The goal of this study was to identify and quantify the most important items in the diet of the green turtle at the foraging grounds of Bahia Elizabeth, Caleta Derek and Punta Nuñez. Our analysis was based on 65 oesophageal samples from turtles captured in 2006 and 2007. We compared spatial and seasonal composition of diet using non-metric multidimensional scaling analysis (MDS) and analysis of similarity (ANOSIM). Green turtle diet was composed mainly of the algae species Ulva lactuca, Polysiphonia sp., Hypnea sp. and Dictyota sp., and the red mangrove Rhizophora mangle. Turtles also consumed animal matter, mainly cnidarians, albeit to a lesser extent. Content of turtle diets was different among feeding grounds and seasons. The ANOSIM showed that diet composition can differ between foraging grounds using presence/absence of diet items. Even though U. lactuca was the most abundant algae consumed in both seasons, changes in species richness of algae were found between both sampling events, with diet during the warm season more varied than the cold season (χ2 = 16.84, df = 6; P < 0.05).

Influence of sand grain size and nest microenvironment on incubation success, hatchling morphology and locomotion performance of green turtles (Chelonia mydas) at the Chagar Hutang Turtle Sanctuary, Redang Island, Malaysia

2018 ◽  
Vol 66 (6) ◽  
pp. 356 ◽  
Author(s):  
Taylor A. Stewart ◽  
David T. Booth ◽  
Mohd Uzair Rusli
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Swimming Speed ◽  
Green Turtle ◽  
Chelonia Mydas ◽  
Sand Particle ◽  
Emergence Success ◽  
Sand Grain Size

The nest microenvironment affects hatching and emergence success, sex ratios, morphology, and locomotion performance of hatchling sea turtles. Sand grain size is hypothesised to influence the nest microenvironment, but the influence of sand grain size on incubation of sea turtle eggs has rarely been experimentally tested. At the Chagar Hutang Turtle Sanctuary, Redang Island, Malaysia, green turtle (Chelonia mydas) nests were relocated to sands with different sand grain sizes on a natural beach to assess whether grain size affects nest temperature, oxygen partial pressure inside the nest, incubation success, hatchling morphology and hatchling locomotion performance. Green turtle nests in coarse sand were cooler; however, hatching success, nest emergence success, oxygen partial pressure, incubation length and hatchling size were not influenced by sand particle size. Nests in medium-grained sands were warmest, and hatchlings from these nests were better self-righters but poorer crawlers and swimmers. Hatchling self-righting ability was not correlated with crawling speed or swimming speed, but crawling speed was correlated with swimming speed, with hatchlings typically swimming 1.5–2 times faster than they crawled. Hence, we found that sand particle size had minimal influence on the nest microenvironment and hatchling outcomes.

The Influence of Weather and Tides on the Land Basking Behavior of Green Sea Turtles (Chelonia mydas) in the Galapagos Islands

2014 ◽  
Vol 13 (2) ◽  
pp. 247-251 ◽  
Author(s):  
Sara M. Maxwell ◽  
Jana W. E. Jeglinski ◽  
Fritz Trillmich ◽  
Daniel P. Costa ◽  
Peter T. Raimondi
Keyword(s):  
Sea Turtles ◽  
Chelonia Mydas ◽  
Galapagos Islands ◽  
Galápagos Islands ◽  
Green Sea Turtles

Somatic Growth Rates of Green Turtles (Chelonia mydas) and Hawksbills (Eretmochelys imbricata) in the Galápagos Islands

2015 ◽  
Vol 49 (4) ◽  
pp. 641-648 ◽  
Author(s):  
Patricia M. Zárate ◽  
Karen A. Bjorndal ◽  
Jeffrey A. Seminoff ◽  
Peter H. Dutton ◽  
A. B. Bolten
Keyword(s):  
Growth Rates ◽  
Somatic Growth ◽  
Chelonia Mydas ◽  
Galapagos Islands ◽  
Galápagos Islands ◽  
Eretmochelys Imbricata ◽  
Green Turtles

scholarly journals Pengaruh Selang Waktu Peletakkan Terhadap Keberhasilan Penetasan Telur Penyu Hijau (Chelonia mydas L.) (Effect of Planting Time on Egg Hatching Success of Green Turtle (Chelonia mydas L.)

2014 ◽  
Vol 19 (3) ◽  
pp. 159
Author(s):  
Edi Wibowo Kushartono ◽  
Endang Sri Susilo ◽  
Sayyidah Fatchiyyah
Keyword(s):  
Green Turtle ◽  
Hatching Success ◽  
Block Design ◽  
Chelonia Mydas ◽  
Hatching Rate ◽  
Egg Hatching ◽  
Time Treatment ◽  
Emergence Success ◽  
Randomized Block Design ◽  
The Impact

Salah satu usaha konservasi melindungi Penyu hijau (Chelonia mydas L.) yaitu dengan tindakan relokasi dengan memindahkan telur dari sarang alami ke tempat penetasan semi alami. Waktu pemindahan dan peletakan telur yang tepat sangat diperlukan untuk memperoleh daya tetas maksimal. Tujuan penelitian ini untuk mengetahui pengaruh selang waktu peletakan telur Penyu Hijau terhadap keberhasilan penetasannya. Rancangan penelitian adalah Rancangan Acak Kelompok berdasarkan 3 induk yang berbeda dengan perlakuan selang waktu peletakan yaitu 2, 7 dan 12 jam. Pengukuran dan pengamatan kondisi lingkungan dilakukan selama inkubasi. Pengamatan munculnya tukik mulai dilakukan pada hari ke 50 masa inkubasi.  Pembongkaran sarang dilakukan pada hari ke 60 masa inkubasi kemudian dilakukan pembedahan secara manual untuk mengamati telur yang gagal menetas. Hasil menunjukkan bahwa tidak ada pengaruh nyata secara signifikan adanya perbedaan selang waktu peletakan terhadap keberhasilan penetasan dan keberhasilan kemunculan. Namun selang waktu peletakan dengan nilai yang baik ditunjukkan pada 2 jam, dilanjutkan dengan 12 jam dan 7 jam. Kata kunci: penetasan, penyu hijau (Chelonia mydas L.), semi alami One of the conservation efforts undertaken to protect the green turtle (C. mydas L.) is by relocation of the nest where the eggs are removed from natural to semi-natural hatchery. A right time for the removal and burial of eggs are needed to obtain maximum hatching rate. The purpose of this study is to determine the impact of interval laying period on the hatching success of the green turtle eggs. Randomized block design is used which is based on three different turtles with treatment interval of burying, which is 2, 7, and 12 h. Measurements and observations were made during the environmental conditions of the incubation period. Observations hatchling emergence started on day 50 of incubation. Nest destruction was conducted on the 60th day incubation then eggs that failed to hatch were manually disected. The result showed that there is no significant influence of the time differences on the hatching success and emergence success. However, the best time was foound on 2h time treatment, folowed by 12h and 7h. Keywords: hatching, green turtle (Chelonia mydas L.), semi-natural hatchery

scholarly journals Keberhasilan Penetasan Telur Penyu Hijau (Chelonia mydas) Dalam Sarang Semi – Alami Dengan Kedalaman Yang Berbeda Di Pantai Sukamade, Banyuwangi, Jawa Timur

2016 ◽  
Vol 19 (2) ◽  
pp. 123
Author(s):  
Edi Wibowo Kushartono ◽  
CB. Ronaldi Chandra E ◽  
Retno Hartati
Keyword(s):  
Success Rate ◽  
Experimental Research ◽  
Green Turtle ◽  
Hatching Success ◽  
Maximum Level ◽  
Chelonia Mydas ◽  
Emergence Success ◽  
Different Depths ◽  
And Performance ◽  
Better Than

One of the conservation efforts undertaken to protect the green turtle (C. mydas L.) is by relocation of the nest where the eggs are removed from natural to semi-natural hatchery. The depth of proper needed to achieve the maximum level of hatching and emergence success.The purpose of this research that is to know the level of hatching catch and the emergence success of a nest at a different depth. The methods that used is an experimental research. Treatment that given is the different depth of nest with the green turtle as repetition. The depth of treatment is in 40 cm, 60 cm, and 80 cm, the amount of eggs is 30 eggs in each nest. Measurement and observation environmental conditions carried out during the incubation period. Observation the emergence of hatchlings started in day 50 of the incubation. Nest destruction was conducted on the 66th day incubation then eggs that failed to hatch were manually disected. The results showed that the levels of different depths does not effect the temperature inside the nest and hatching success, but the effect on the success rate of appearance. hatching success at all depths ranging between 93,33% - 94.44% (the same height), but increasingly in the depth of the nest success rate of appearance tends to decrease. Figures shown good appearance at a depth of 40 cm (86.67%), followed by 60 and 80 cm depth is 64.44% and 48.89% (sequential). The results of visual observations of the morphometry and performance lokomotori, hatchlings hatched at a depth of 60 and 80 cm better than hatchlings hatched at a depth of 40 cm both in the size and aggressiveness lokomotori swing flipper. Keyword: hatching success, green turtle (Chelonia mydas L.), semi-natural hatchery Salah satu usaha konservasi yang dilakukan untuk melindungi Penyu hijau (Chelonia mydas L.) yaitu dengan tindakan relokasi yang mana telur dipindahkan dari sarang alami ke tempat penetasan semi alami. Kedalaman yang tepat dibutuhkan untuk mendapatkan tingkat penetasan dan keberhasilan kemunculan yang maksimal. Tujuan penelitian ini yaitu untuk mengetahui tingkat keberhasilan penetasan dan keberhasilan kemunculan pada kedalaman sarang yang berbeda. Metode yang dipakai dalam penelitian adalah experimental research dengan 3 perlakuan yaitu penanaman telur penyu hijau pada kedalaman 40, 60 dan 80 cm, dengan kepadatan 30 butir telur setiap sarang. Pengukuran dan pengamatan kondisi lingkungan juga dilakukan selama masa inkubasi. Pengamatan munculnya tukik mulai dilakukan pada hari ke 50 masa inkubasi.  Pembongkaran sarang dilakukan pada hari ke 66 masa inkubasi kemudian dilakukan pembedahan secara manual untuk mengamati telur yang gagal menetas. Hasil yang didapat menunjukkan bahwa tingkat kedalaman yang berbeda tidak berpengaruh terhadap suhu dalam sarang dan keberhasilan penetasan, tetapi berpengaruh terhadap tingkat keberhasilan kemunculan. Angka keberhasilan penetasan pada semua kedalaman berkisar antara 93,33% - 94,44% (sama-sama tinggi), namun semakin dalam tingkat kedalaman sarang tingkat keberhasilan kemunculan cenderung mengalami penurunan. Angka kemunculan yang baik ditunjukkan pada kedalaman 40 cm (86,67%), diikuti kedalaman 60 dan 80 cm yaitu 64,44% dan 48,89% (secara berurut). Hasil pengamatan secara visual terhadap morfometri dan performa lokomotori, tukik yang ditetaskan pada kedalaman 60 dan 80 cm lebih baik dibandingkan tukik yang ditetaskan pada kedalaman 40 cm baik dari ukuran maupun lokomotori agresifitas ayunan  flipper.  Kata kunci: Keberhasilan penetasan, Penyu hijau, Semi alami 

CONDITIONS OF HILLING HABITAT OF CHELONIA MYDAS (GREEN TURTLE) IN PANGUMBAHAN BEACH UJUNG GENTENG, SUKABUMI SELATAN

2019 ◽  
Vol 1 (02) ◽  
pp. 64-67
Author(s):  
Meilisha Putri Pertiwi ◽  
Suci Siti Lathifah
Keyword(s):  
Data Collection ◽  
Surface Temperature ◽  
Green Turtle ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Chelonia Mydas ◽  
Nesting Habitat ◽  
Beach Width ◽  
The Many ◽  
Pandanus Tectorius

Research on the condition of the nesting habitat of Chelonia mydas (green turtle) in Pangumbahan Beach, Ujung Genteng, South Sukabumi has been carried out. Data retrieval is done 6 times for 2 days, 27-28 November 2017 at 3 observation stations. The abiotic parameters measured include surface temperature and depth of 50 cm, surface humidity and depth of 50 cm, beach width, beach slope, and the size of sand grains. While the biotic parameters measured were density, relative density, the frequency of attendance, and distribution patterns of Pandanus tectorius (sea pandanus) vegetation. Based on the results of data processing, the biophysical conditions in Pangumbahan Beach are still suitable for the Chelonia mydas nesting habitat. It also got clear evidence of the many Chelonia mydas landings during the data collection.

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.

Discovery of a Major East Pacific Green Turtle (Chelonia mydas) Nesting Population in Northwest Costa Rica

2018 ◽  
Vol 17 (2) ◽  
pp. 169
Author(s):  
Luis G. Fonseca ◽  
Pilar Santidrián Tomillo ◽  
Wilbert N. Villachica ◽  
Wagner M. Quirós ◽  
Marta Pesquero ◽  
...  
Keyword(s):  
Costa Rica ◽  
Green Turtle ◽  
Chelonia Mydas ◽  
East Pacific
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