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The Probable Cause for Nesting Pattern of Olive Ridley (Lepidochelys olivacea) at Ramnagar Beach, North East Coast of Andaman Island, India

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Open Journal of Marine Science 2023年第1期13卷 7-27页

作者： Arun Malarvizhi M. M. Ilaamurughu P. M. Mohan Department of Ocean Studies and Marine Biology Pondicherry University Off Campus Port Blair Andaman and Nicobar Islands India

The nesting behaviour of sea turtles remains a subject to study, due to their enigmatic pattern of seasonal breeding activities. Over a period of time, several reports have been made in this context associated with the nesting behaviour of the Olive Ridley turtles. In the present study, characteristics of the breeding beach and nesting pattern of Olive Ridley (Lepidochelys olivacea) at Ramnagar along N-E coast of Andaman Islands were investigated, during the nesting periods 2016-2017. The study area hosts Olive Ridley, the dominant sea turtles with more than 300 individuals nesting each year. For this study, the number of sea turtles visited, nested, the sediment characters, salinity, and temperature were taken. The exposed sandy nesting beach characteristics are prone to varying degrees of morphological changes every day. The results depict that even though similar grain size (Coarse Sand to Fine Sand and Very well sorted to Poorly Sorted), with an ambient incubating temperature, pH and salinity with wide nesting area, the selective nesting in the particular location of the beach identified because of comfortable energy conditions in the waters (1.5 m/s) favours the female turtles to reach the beach at the preferable site of Ramnagar and nest.

关键词： sea turtle Olive Ridley Ramnagar Beach Nesting Environment Morphological Changes Sand Grain Hatchling North Andaman

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Nesting Biology and Site Selection of Olive Ridley—A Coherence of Nature

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Open Journal of Marine Science 2023年第2期13卷 29-39页

作者： Arun Malarvizhi P. M. Mohan Department of Ocean Studies and Marine Biology Pondicherry University of Campus Port Blai India

Nesting behaviour of sea turtles remains a subject to study, due to their enigmatic pattern of seasonal breeding activities. In the present study, characteristics of the breeding turtle, Olive Ridley (Lepidochelys olivacea) at Ramnagar along N-E coast of North Andaman Islands were investigated, for the nesting periods 2016-2017. Olive Ridley is the dominant sea turtles, with more than 300 individuals nesting every season with at least a 75% hatching success rate. It is one of the conducive, highly protective and undisturbed nesting sites for Olive Ridley on North Andaman coast. In the present study an initiative is made, to identify nature’s cues and the biological characteristics of Olive Ridley, which leads it to nest at Ramnagar beach, with a high hatchling success rate.

关键词： sea turtle Olive Ridley Ramnagar Beach Nesting Beach Sand Grain Hatch-ling North Andaman

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Structure and Function of the Gastrointestinal Tract of the Green turtle(Chelonia mydas) Hatchling

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Asian Herpetological Research 2015年第4期6卷 317-330页

作者： Hualing CHEN Mingbin YE Yuyan LU Jinxia DUAN Pipeng LI Hexiang GU Institute of Herpetology and Liaoning Key Lab of Evolution and Biodiversity Shenyang Normal University National Huidong sea turtle Nature Reserve Management Bureau

The gastrointestinal tracts of four Chelonia mydas hatchlings were examined at the anatomical, histological and ultrastructural level. Our results show that the gastrointestinal tract（GI） is composed by esophagus, stomach, small intestine（SI） and large intestine（LI）, and histologically of mucosa, submucosa, muscularis externa（ME） and serosa. The esophagus is marked by conical papillae lined by keratinized stratified squamous epithelium, whereas the remaining GI by simple columnar epithelium; esophageal diverticulum is absent. The stomach covered with mucous granule cells, contains cardia, fundic regions and pylorus, which are separately characterized by cardiac glands, fundic glands and pyloric glands, and have the thickest submucosa and ME of the GI. The ME of the esophagus mainly consist of one layer of circular smooth muscle whereas the rest of GI of two layers, inner circular muscle and outer longitudinal muscle. The SI is slightly longer than the LI and the GI is approximately 5.11 times of the carapace length. The SI is lined with longitudinal zigzag folds and characterized by absorptive cells with longer and denser microvilli, whereas the LI by transversal folds, goblet cells and lymphoid nodules. Only intestinal glands appear in duodenum. Endocrine cells are observed in all sections of the GI and accounted for the largest proportion in duodenum. The results demonstrate a perfect combination of the structure and function of the GI and reveal that the digestion and absorption primarily occurs in the foregut. C. mydas hatchling may prefer carnivorous diet.

关键词： anatomy histology ultrastructure digestive tract diet sea turtle

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