scholarly journals KONDISI HABITAT DAN KAITANNYA DENGAN JUMLAH PENYU HIJAU (Chelonia mydas) YANG BERSARANG DI PULAU DERAWAN, BERAU-KALIMANTAN TIMUR

2017 ◽  
Vol 14 (2) ◽  
pp. 195
Author(s):  
Dharmadi Dharmadi ◽  
Ngurah Nyoman Wiadnyana
Keyword(s):  
Green Turtle ◽  
Habitat Degradation ◽  
Survey Methods ◽  
High Tide ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Coastal Vegetation ◽  
Vegetation Density ◽  
Nesting Habitat ◽  
East Kalimantan

Chelonia mydas merupakan spesies penyu yang paling umum dari 6 spesies yang ditemukan di Indonesia. Dewasa ini, jumlah penyu hijau banyak mengalami penurunan, karena berbagai faktor seperti ada perburuan dan pengambilan telur penyu secara ilegal, serta terjadi degradasi habitat. Dalam penelitian ini dipelajari kondisi habitat peneluran dan fluktuasi jumlah penyu hijau (Chelonia mydas) yang mendarat di Pulau Derawan, Kabupaten Berau-Kalimantan Timur, yang diharapkan dapat dijadikan sebagai bahan masukan bagi pengelolaan habitat penyu. Penelitian yang dilakukan pada bulan Maret dan September 2006 menggunakan metode survei dan pengamatan langsung di lapangan. Deskripsi dari habitat penyu bertelur adalah daratan luas dan landai yang terletak di atas bagian pantai dengan rata-rata kemiringan 30° serta di atas pasang surut antara 30 sampai dengan 50 m. Kondisi pantai berpasir tidak kurang dari 90% dan sisa debu maupun tanah liat dengan diameter butiran halus sampai dengan sedang. Jumlah penyu yang mendarat di Pulau Derawan 408 ekor pada tahun 2004 menurun menjadi 168 ekor pada tahun 2005. Penurunan jumlah penyu hijau (Chelonia mydas) yang mendarat di Pulau Derawan disebabkan oleh menurunnya kondisi lingkungan pantai akibat meningkatnya aktivitas masyarakat, berkurangnya kerapatan vegetasi pantai akibat abrasi, dan berkurangnya ruang tempat peneluran karena pembangunan rumah wisata di pinggir pantai di Pulau Derawan. Green turtle is a most common of six turtles species found in Indonesia. Actualy, this turtle population has much decreased, due to some factors, such as turtle hunting and turtle eggs taking illegally as well as habitat degradation occurrence. The current work studied the condition of nesting habitat and the fluctuation of green turtle (Chelonia mydas) population landed in Derawan Island, Berau District in East Kalimantan, with hope that the results are usefull as input for better management of sea turtle habitat. The study that was conducted on March and September 2006 used survey methods and direct observation in the field. Habitat description of green turtle (Chelonia mydas) shows that the area for nesting is the sandy coast of less than 30° slope, silt as well as compacted beach with small and medium grains diameter, and the difference between low and high tide is 30 to 50 cm. Green turtle (Chelonia mydas) number in the nesting area of Derawan Island was 408 individuals in 2004 and decreased to about 168 individuals in 2005. This condition might be caused by the degradation of nesting habitat environment due to the increase of human activity, decrease of coastal vegetation density by coastal abration, and decrease of nesting habitat caused by the builts of housing and resort in the coastal area of Derawan Island.

scholarly journals Characteristics of nesting habitat of sea turtle Lepidochelys olivacea in Lhoknga Beach, Aceh Besar District, Indonesia

2018 ◽  
Vol 3 (1) ◽  
pp. 25-32 ◽  
Author(s):  
Hindar Hindar ◽  
Zainal A. Muchlisin ◽  
Faisal Abdullah
Keyword(s):  
Sea Turtles ◽  
High Tide ◽  
Sea Turtle ◽  
Coastal Vegetation ◽  
Nest Temperature ◽  
Nesting Habitat ◽  
Lepidochelys Olivacea ◽  
Coastal Slope

The purpose of this study was to determine the characteristics of nesting habitat of sea turtle in Lhoknga beach. The observation was conducted at three locations from January to March 2016. The study showed that the coastal slope average ranges 1.03 ° - 1.38 °. The average of nest temperature was 28.05 °C to 29.47 °C (inside the nest) and from 28.77 ° C to 29.95 ° C (at the surface of the nest). The width beach at high tide ranges from 20.17 m to 21.83 m and 31 m to 33.83 m at low tide. The nest humidity ranges from 20.5% -24.15%. There were six species of coastal vegetation recorded during the study, where station 1 has higher of density and diversity of the coastal vegetation. In general, Lhoknga Beach is suitable for nesting of the sea turtle. A total of 13 sea turtles (Lepidochelys olivacea) were nesting during the study, where station 1 had higher of nesting frequency.

scholarly journals PRESENT STATUS OF NESTING HABITAT OF GREEN TURTLE (Chelonia mydas) lN WEST JAVA-INDONESIA

2017 ◽  
Vol 15 (1) ◽  
pp. 49
Author(s):  
Adriani Sri Nastiti Krismono ◽  
Amula Nurfiarini ◽  
Ahmad Fitrianto ◽  
Ngurah Nyoman Wiadnyana
Keyword(s):  
Present Status ◽  
Protected Area ◽  
Green Turtle ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Coastal Habitat ◽  
Nesting Habitat ◽  
Habitat Condition ◽  
West Java

The coastal habitat condition much influences the moving of sea turtles to coast for nesting. In West Java Province there are some potential coasts as nesting habitat of sea turtles, but it has experiencing of many damage and has not been touched yet as the protected area for sea turtle nesting habitat.

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.

The Effect of Invertebrate Infestation on Green Turtle (Chelonia mydas) Nests on Kazanlı Beach, Mersın, Turkey

2020 ◽  
Vol 27 (5) ◽  
pp. 245-256
Author(s):  
Cemil Aymak ◽  
Aşkın Hasan Uçar ◽  
Yusuf Katılmış ◽  
Eyup Başkale ◽  
Serap Ergene
Keyword(s):  
Green Turtle ◽  
Hatching Success ◽  
Negative Relationship ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Faunal Composition ◽  
Independent Variables ◽  
Invertebrate Species ◽  
First Time ◽  
Nesting Season

In this study invertebrate infestation in green turtle (Chelonia mydas) nests were recorded for the first time for Kazanlı beach, Mersin, Turkey. For this aim, in 2006 nesting season, 294 natural intact green turtle nests were sampled to examine their contents and invertebrate infestation was found in 76 (25.85% of the total sampling green turtle nests). These infested nests were examined in terms of the invertebrate faunal composition. The specimens found in the green sea turtle nests were identified to order, family or genus levels and they were represented in 5 orders. These invertebrate groups are Elater sp. larvae (Elateridae; Coleoptera), Pimelia sp. larvae (Tenebrionidae; Coleoptera), Enchytraeidae (Oligochaeta), Cyrptostigmata (Acari), Oniscidae (Isopoda), Formicidae (Hymenoptera). Elater sp. was the most common invertebrate group in the green turtle nests. According to student t test, we found statistically significant differences between 7 independent variables and invertebrate species presence. Furthermore, logistic regression analysis explained that there is a negative relationship between hatching success rate and invertebrate species presence.

scholarly journals ASPEK MORFOLOGI, REPRODUKSI, DAN PERILAKU PENYU HIJAU (Chelonia mydas) Di PANTAI PANGUMBAHAN, KABUPATEN SUKABUMI, JAWA BARAT

2017 ◽  
Vol 3 (2) ◽  
pp. 93
Author(s):  
Adriani Sri Nastiti Krismono ◽  
Achmad Fitriyanto ◽  
Ngurah Nyoman Wiadnyana
Keyword(s):  
Green Turtle ◽  
Carapace Width ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Stratified Sampling ◽  
Hatching Rate ◽  
Brood Stock ◽  
Green Turtles ◽  
And Behavior ◽  
Nesting Season

Penyu hijau (Chelonia mydas) termasuk dalam phylum Chordata dan famili Cheloniideae. Jumlah penyu hijau yang singgah ke Pantai Pangumbahan untuk bertelur semakin menurun karena tidak terkendalinya masyarakat melakukan penangkapan induk penyu dan pengambilan telurnya. Penelitian tentang morfologi, reproduksi, dan perilaku penyu hijau sebagai salah satu dasar pengelolaan telah dilakukan di Pantai Pangumbahan pada bulan Agustus 2008. Metode penelitian yang digunakan pengambilan contoh berstrata. Penelitian ini dilaksanakan pada bulan Agustus 2008 (pada saat puncak peneluran). Parameter yang diamati antara lain ukuran penyu dari 89 ekor jumlah penyu bersarang, jumlah telur dan tingkat penetasan, serta perilaku pada saat penyu bertelur. Hasil penelitian menunjukan yang diamati diperoleh panjang karapas berkisar antara 97-15 cm dan lebar karapas 83,5-108 cm, jumlah penyu naik ke pantai 89 ekor dan penyu yang bertelur 39 ekor. Jumlah telur penyu hijau berhasil dihitung 80-105 butir per induk penyu. Bulan Agustus 2008 merupakan puncak musim peneluran. Kegiatan peneluran penyu hijau dibagi menjadi enam tahap. Upaya konservasi yang sudah dilakukan adalah penetasan telur penyu semi alami, restocking tukik, dan menjaga keamanan sarang telur penyu. Green turtles (Chelonia mydas), including the phylum Chordata and families Cheloniideae. The number of green turtles come to lay eggs Pangumbahan beach to decline because of increasingly unmanageable public do making arrests turtles brood stock and their eggs. Research on the morphology, reproduction, and behavior of green turtles as one of the basic management has been conducted on the Pangumbahan Beach in August 2008. The method used stratified sampling. The experiment was conducted in August 2008 (at the peak of nesting). Other parameters were observed between the size of the 89 tail number of turtles nesting turtles, the number of eggs and hatching rate and behavior during turtle nesting. Results obtained showed that the observed length ranges from 97- 15 cm carapace and carapace width from 83.5-108 cm, the number went up to the beach 89 sea turtle and sea turtle nesting tail as much as 39 tails. The number of green turtle eggs had counted as many as 80-105 eggs per turtles brood stock. Month August 2008 is the peak nesting season of green turtle nesting activities are divided into six stages. Conservation efforts that have been done is semi natural turtle hatchery, restocking hatchlings, and nest of turtle eggs to maintain security.

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.

scholarly journals The value of long-term, community-based monitoring of marine turtle nesting: a study in the Lamu archipelago, Kenya

Oryx ◽  
2017 ◽  
Vol 53 (1) ◽  
pp. 71-80 ◽  
Author(s):  
Mike I. Olendo ◽  
Gladys M. Okemwa ◽  
Cosmas N. Munga ◽  
Lilian K. Mulupi ◽  
Lily D. Mwasi ◽  
...  
Keyword(s):  
Green Turtle ◽  
Low Cost ◽  
Western Indian Ocean ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Marine Turtle ◽  
Olive Ridley ◽  
Community Based ◽  
Green Turtles ◽  
Incubation Duration

AbstractMonitoring of nesting beaches is often the only feasible and low-cost approach for assessing sea turtle populations. We investigated spatio-temporal patterns of sea turtle nesting activity monitored over 17 successive years in the Lamu archipelago, Kenya. Community-based patrols were conducted on 26 stretches of beach clustered in five major locations. A total of 2,021 nests were recorded: 1,971 (97.5%) green turtleChelonia mydasnests, 31 (1.5%) hawksbillEretmochelys imbricatanests, 8 (0.4%) olive ridleyLepidochelys olivaceanests and 11 (0.5%) unidentified nests. Nesting occurred year-round, increasing during March–July, when 74% of nests were recorded. A stable trend in mean annual nesting densities was observed in all locations. Mean clutch sizes were 117.7 ± SE 1 eggs (range 20–189) for green turtles, 103±SE 6 eggs (range 37–150) for hawksbill turtles, and 103±SE 6 eggs (range 80–133) for olive ridley turtles. Curved carapace length for green turtles was 65–125 cm, and mean annual incubation duration was 55.5±SE 0.05 days. The mean incubation duration for green turtle nests differed significantly between months and seasons but not locations. The hatching success (pooled data) was 81.3% (n = 1,841) and was higher for in situ nests (81.0±SE 1.5%) compared to relocated nests (77.8±SE 1.4%). The results highlight the important contribution of community-based monitoring in Kenya to sustaining the sea turtle populations of the Western Indian Ocean region.

scholarly journals Pathological changes by Hapalotrema postorchis Rao 1976 (Digenea: Spirorchiidae) in a green turtle Chelonia mydas Linnaeus 1758 (Testudines, Cheloniidae) from Brazil

2015 ◽  
Vol 52 (2) ◽  
pp. 148-154 ◽  
Author(s):  
M. R. Werneck ◽  
G. B. Souza ◽  
B. C. Berger ◽  
A. Trazzi ◽  
R. B. Ribeiro ◽  
...  
Keyword(s):  
Foreign Body ◽  
Aortic Aneurysm ◽  
Atlantic Ocean ◽  
Green Turtle ◽  
Chelonia Mydas ◽  
Giant Cells ◽  
Sea Turtle ◽  
Vascular Lesion ◽  
Pathological Changes ◽  
Foreign Body Giant Cells

SummaryThis note reports the occurrence of Hapalotrema postorchis Rao 1976 collected from an aortic aneurysm in a green turtle (Chelonia mydas Linnaeus 1758) found on the coast of Brazil. Besides the vascular lesion, granulomatous reactions with foreign - body giant cells were found surrounding the parasite eggs in the heart, intestines, liver, pancreas, spleen, brain and kidneys. This paper presents the first report of H. postorchis and accompanying lesions in a green sea turtle from the western South Atlantic Ocean.

scholarly journals KARAKTERISTIK SARANG PENYU HIJAU (CHELONIA MYDAS) DI PULAU KASIAK KAWASAN KONSERVASI PENANGKARAN PENYU PARIAMAN, SUMATERA BARAT

2018 ◽  
Vol 46 (2) ◽  
pp. 42
Author(s):  
Desi Nova Sari ◽  
Muhammad Fauzi ◽  
Eni Sumiarsih
Keyword(s):  
Green Turtle ◽  
High Tide ◽  
Chelonia Mydas ◽  
Nest Temperature ◽  
Thespesia Populnea ◽  
Quality Of Water ◽  
Substrate Texture ◽  
Water Edge ◽  
The Common

The research aimed to understand the nesting area characteristic of C. mydas in the Kasiak Island was conducted from March-April 2017, coincidence with the nesting time of green turtle. Observation of the nesting area of green turtle was conducted in the Northern, Southern, Western and Eastern parts of the island. Parameters studied were the slope of the beach, the distance between the water edge during the high tide and the nest, sand texture, types of vegetations around the nest, number of nests present and the quality of water around the island.  Results shown that the coast’s slope ranged from 1.74 to 2.890, the distance between the water edge during the high tide and the nest ranged from 1.17 to 1.70 m, the substrate texture was dominated by sand (> 90%), silt (3.4-7.25%) and clay (2-8%).  The nest temperature was 25-320C, nest humidity was 30-40% and the common vegetation was Thespesia populnea.  Quality of the water  around the Kasiak Island are as follows: temperature was 29-300C, salinity was from 33-34 ‰, current speedwas 0.4-0.5 m / s and pH was 8.

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