Nesting ecology of Olive Ridley (Lepidochelys olivacea) turtles on Arribada nesting beaches

2021 ◽  
Author(s):  
Shaya Honarvar
Keyword(s):  
Olive Ridley ◽  
Nesting Ecology ◽  
Lepidochelys Olivacea ◽  
Nesting Beaches

scholarly journals Schistosomus Reflexus Syndrome in Olive Ridley Sea Turtles (Lepidochelys olivacea)

2016 ◽  
Vol 54 (1) ◽  
pp. 171-177 ◽  
Author(s):  
A. Bárcenas-Ibarra ◽  
I. Rojas-Lleonart ◽  
R. I. Lozano-Guzmán ◽  
A. García-Gasca
Keyword(s):  
Congenital Malformations ◽  
Sea Turtle ◽  
Olive Ridley ◽  
Developmental Defects ◽  
Mexican Pacific ◽  
Turtle Species ◽  
Lepidochelys Olivacea ◽  
Populations At Risk ◽  
Different Types ◽  
Nesting Beaches

The olive ridley sea turtle ( Lepidochelys olivacea), considered the most abundant sea turtle species, is listed as vulnerable on the International Union for Conservation of Nature Red List. The most important nesting areas are located in the Eastern Pacific, and congenital malformations have been previously reported in this species. The present study was conducted in a single population at El Verde beach, one of the most important nesting beaches for the species in the northwestern Mexican Pacific. The study was based on embryos that had been incubated in a controlled environment. Schistosomus reflexus syndrome (SRS) was observed in 124 of 20 257 olive ridley embryos (0.6%), comprising 124 of 400 (31%) cases of congenital malformations over a 7-month period. Affected embryos had malformations of the carapace, bridge, or plastron, resulting in exposure of the abdominal or thoracic viscera, as well as spinal malformation and abnormal positioning of limbs adjacent to the head with subsequent ankylosis. SRS phenotypes (although lethal) varied from mild to severe, although most cases were severe. SRS was mostly associated with congenital malformations in the neck (short neck, 80%), tail (anury, 38%), and flippers (different types of dysmelias, 53%). In most cases of severe SRS, ankyloses were present. Documenting these findings could be important to identify the cause of the developmental defects, and identification of the cause of the defects may be of significance to the population and to our efforts to manage this and other populations at risk.

scholarly journals Mortality of olive ridley turtles Lepidochelys olivacea due to incidental capture in fishing nets along the Orissa coast, India

Oryx ◽  
1997 ◽  
Vol 31 (1) ◽  
pp. 32-36 ◽  
Author(s):  
B. Pandav ◽  
B. C. Choudhury ◽  
C. S. Kar
Keyword(s):  
Coastal Waters ◽  
Sea Turtle ◽  
Commercial Fishing ◽  
Olive Ridley ◽  
Term Survival ◽  
Lepidochelys Olivacea ◽  
Incidental Capture ◽  
Orissa Coast ◽  
Almost All ◽  
Nesting Beaches

The coastal state of Orissa, India, harbours three important mass-nesting beaches of the olive ridley sea turtle Lepidochelys olivacea. During a survey of sea turtle nesting beaches from December 1993 to May 1994, 5282 dead olive ridleys were counted along the 480 km coastline of Orissa. Almost all the deaths were due to incidental capture in offshore fishing nets. Increased fishing activities in the coastal waters near important sea-turtle nesting beaches pose a serious threat to the survival of this endangered sea turtle. It is therefore suggested that coastal waters adjacent to major sea-turtle nesting beaches be declared as closed areas for commercial fishing activities in order to ensure the sea turtle's long-term survival.

Effects of incubation technique on proxies for olive ridley sea turtle (Lepidochelys olivacea) neonate fitness

2016 ◽  
Vol 37 (4) ◽  
pp. 417-426 ◽  
Author(s):  
Catherine E. Hart ◽  
Alan A. Zavala-Norzagaray ◽  
Odin Benítez-Luna ◽  
Luis Javier Plata-Rosas ◽  
F. Alberto Abreu-Grobois ◽  
...  
Keyword(s):  
Natural Environment ◽  
Carapace Length ◽  
Sea Turtle ◽  
Locomotor Performance ◽  
Direct Effects ◽  
Olive Ridley ◽  
Lepidochelys Olivacea ◽  
Performance Time ◽  
Righting Response ◽  
Nesting Beaches

Sea turtles and their nests face multiple threats on nesting beaches. Techniques have been developed to mitigate threats, these include relocating nests to fenced-off hatcheries or polystyrene boxes. The alteration of the nest’s natural environment may have direct effects on hatchling phenotype and locomotor performance. To test the effects of these two incubation conditions on proxies for hatchling fitness, we analysed locomotor performance (time to crawl 3 m and righting response) and phenotypic measures (weight and carapace length and width) of olive ridley sea turtle (Lepidochelys olivacea) hatchlings. We found that mean temperature was higher in hatcheries (30.5°C) than in polystyrene boxes (29.9°C) and that hatchlings incubated in polystyrene boxes had smaller straight carapace length (39.2 mm ± 2.0) and were significantly slower in crawl speed (CS) (0.0107 m s−1 ± 0.005) than those from hatcheries (SCL = 40.7 mm ± 1.3; CS = 0.018 m s−1 ± 0.005).

scholarly journals The Characteristics of olive ridley sea turtle (Lepidochelys olivacea) nesting beaches and hatcheries in Bantul, Yogyakarta, Indonesia

2019 ◽  
Vol 20 (11) ◽  
Author(s):  
Agung Budiantoro ◽  
CATUR RETNANINGDYAH ◽  
LUCHMAN HAKIM ◽  
AMIN SETYO LEKSONO
Keyword(s):  
Landing Site ◽  
Sea Turtle ◽  
Daily Temperature ◽  
Magnetic Mineral ◽  
Hatching Rate ◽  
Olive Ridley ◽  
Lepidochelys Olivacea ◽  
Average Percentage ◽  
Nesting Beaches ◽  
Sand Size

Abstract. Budiantoro A, Retnaningdyah C, Hakim L, Leksono AS. 2019. Characteristics of olive ridley sea turtle (Lepidochelys olivacea) nesting beaches and hatcheries in Bantul, Yogyakarta, Indonesia. Biodiversitas 20: 3119-3125. We analyzed the ecological conditions of the beaches in Bantul, Java, Indonesia, in supporting the olive ridley sea turtle emergences and nesting. The study was performed at four beaches in Bantul, namely Pelangi, Samas, Goa Cemara, and Pandansimo. We collected data in areas where olive ridley sea turtle nests, such as beach width, slope, sand size, the percentage of magnetic mineral, daily temperature fluctuations, hatchlings rates, and vegetation. The results showed that Pelangi Beach was broader and steeper (31.26 m; slope 5.10°) than the rest (p<0.05). There was no difference in the sand size (diameter of 0.99 mm). The magnetic mineral content in sand ranged from 51.68-87.50%, while the daily temperature ranged from 24.3-31.0°C. The average percentage of hatchlings from 2012 to 2018 was 60.89%. Vegetation on the four beaches is almost the same, which was shrimp pine trees, runny grass, thistle, papyrus, and pandanus thorns. The average pH level of the nest hatchery was 7, supporting the hatchling embryology process. Ecologically, Pelangi Beach is the best turtle landing site in Bantul. Furthermore, transferring olive ridley sea turtle eggs to seminatural nests is recommended due to the quite high hatching rate.

Essential and trace metals in a post-nesting olive ridley turtles (Lepidochelys olivacea) in Ceuta beach, Sinaloa, Mexico

2021 ◽  
Author(s):  
Vicente Olimón-Andalón ◽  
Jorge Valdés-Flores ◽  
Cesar Paul Ley-Quiñonez ◽  
Alan A. Zavala-Norzagaray ◽  
A. Alonso Aguirre ◽  
...  
Keyword(s):  
Trace Metals ◽  
Olive Ridley ◽  
Lepidochelys Olivacea

Rearing the Olive ridley Lepidochelys olivacea in artificial sea water

2007 ◽  
Vol 26 (1) ◽  
pp. 90-94
Author(s):  
S. PAULRAJ ◽  
S. SUBBARAYALU NAIDU ◽  
J. PAKKIARAJ
Keyword(s):  
Sea Water ◽  
Olive Ridley ◽  
Lepidochelys Olivacea

scholarly journals Chelonicola and Poulinea, two new gomphonemoid diatom genera (Bacillariophyta) living on marine turtles from Costa Rica

Phytotaxa ◽  
2015 ◽  
Vol 233 (3) ◽  
pp. 236 ◽  
Author(s):  
Roksana Majewska ◽  
J. P. Kociolek ◽  
Evan W. Thomas ◽  
Mario De Stefano ◽  
Mario Santoro ◽  
...  
Keyword(s):  
Costa Rica ◽  
Marine Mammals ◽  
Sea Turtles ◽  
Sea Turtle ◽  
New Genera ◽  
Olive Ridley ◽  
Lepidochelys Olivacea ◽  
Marine Turtles ◽  
The Family ◽  
Long Time

Marine mammals such as whales and dolphins have been known for a long time to host a very specific epizoic community on their skin. Less known however is the presence of a similar community on the carapaces of sea turtles. The present study is the first describing new taxa inhabiting sea turtle carapaces. Samples, collected from nesting olive ridley sea turtles (Lepidochelys olivacea) on Ostional Beach (Costa Rica), were studied using light and scanning electron microscopy. Two unknown small-celled gomphonemoid taxa were analysed in more detail and are described as two new genera, closely related to other gomphonemoid genera with septate girdle bands, such as Tripterion, Cuneolus and Gomphoseptatum. Chelonicola Majewska, De Stefano & Van de Vijver gen. nov. has a flat valve face, uniseriate striae composed of more than three areolae, simple external raphe endings, internally a siliceous flap over the proximal raphe endings and lives on mucilaginous stalks. Poulinea Majewska, De Stefano & Van de Vijver gen. nov. has at least one concave valve, uniseriate striae composed of only two elongated areolae, external distal raphe endings covered by thickened siliceous flaps and lives attached to the substrate by a mucilaginous pad. Chelonicola costaricensis Majewska, De Stefano & Van de Vijver sp. nov. and Poulinea lepidochelicola Majewska, De Stefano & Van de Vijver sp. nov. can be separated based on stria structure, girdle structure composed of more than 10 copulae, raphe structure and general valve outline. A cladistics analysis of putative members of the Rhoicospheniaceae indicates that the family is polyphyletic. Chelonicola and Poulinea are sister taxa, and form a monophyletic group with Cuneolus and Tripterion, but are not closely related to Rhoicosphenia, or other genera previously assigned to this family. Features used to help diagnose the family such as symmetry and presence of septa and pseudosepta are homoplastic across the raphid diatom tree of life.

Effect of Hatchery Nest Environment on Olive Ridley (Lepidochelys olivacea) Hatchling Performance

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Chandana Pusapati ◽  
Muralidharan Manoharakrishnan ◽  
Andrea D. Phillott ◽  
Kartik Shanker
Keyword(s):  
Olive Ridley ◽  
Lepidochelys Olivacea
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