Hasanuddin University

Don't Leave The Nests Alone!: A Case Study In Alas Purwo National Park, East Java, Indonesia

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dc.contributor.author Maulany, Risma I.
dc.contributor.author Baxter, Greg S.
dc.contributor.author Booth, David T.
dc.contributor.author Spencer, Ricky J.
dc.date.accessioned 2018-04-06T04:47:12Z
dc.date.available 2018-04-06T04:47:12Z
dc.date.issued 2012-05
dc.identifier.citation Harvard Style en_US
dc.identifier.uri http://repository.unhas.ac.id/handle/123456789/27235
dc.description.abstract The role and effectiveness of hatcheries as a sea turtle conservation tool have been debated for some time due to some emerging problems such as inconsistency of hatching rate, effects on the gene pool, lost genetic diversity, and skewed sex ratios. It has been suggested by other studies that the hatchery should only be used for nests at risk in the natural environment. Egg relocation to the hatchery has been routinely carried out in Alas Purwo National Park (East Java, Indonesia) since 1983. This study aims to provide an evaluation of the on-going hatchery practices in the Park through an examination of predation on olive ridley turtle (Lepidochelys olivacea) nests. Nests found in natural habitat were randomly allocated into treatment (surrounding by a predator-proof cage) and control nests. An ibutton data logger was placed 40 cm depth in the centre of each nest to measure temperatures and all nests were checked daily for predator incursion. The presence of predators on the nesting beach was monitored by passive soil plots (2 x 3 m) every 500 m along the beach. In 2010, camera traps were set to record the predator activity around selected nests. Beach temperatures in each year were also measured by employing ibuttons in four different areas of the beach. Over two nesting seasons (2009 and 2010) the tracks of the little civet (Viverricula indica), palm civet (Arctogalidia trivirgata), wild pig (Sus scrofa), and monitor lizard (Varanus salvator) were found on the beach. Monitor lizard’s tracks were the most commonly found in both years and both caged and non-caged nests were mostly raided by monitors. The predation rates of caged and uncaged nests were 100% for both years (N=11 nests in 2009 and N= 19 nests in 2010). Due to logistical considerations, only 2010 data were used in predator survey. The monitor lizards were widely distributed along the beach and more abundant compared to other predators. But they were relatively more abundant in the eastern beach (mean daily tracks in eastern beach: 3.8±0.4; in western beach: 2.79±0.9). The method of protection by using wire cage is ineffective in preventing egg predation by the major nest predators occurring in Alas Purwo due to high costs in materials and labour as well as being impractical to deploy on such a long nesting beach. The beach temperatures in both years were generally high ranging from around 25° C to almost 36° C during the nesting season. Therefore, the current hatchery practices through egg relocation to the hatchery can be justified as the main conservation tool. en_US
dc.language.iso en_US en_US
dc.publisher Proceedings Of The Thirty-First Annual Symposium On Sea Turtle Biology And Conservation en_US
dc.relation.ispartofseries NOAA Technical Memorandum NMFS-SEFSC-631;
dc.subject Research Subject Categories::NATURAL SCIENCES en_US
dc.title Don't Leave The Nests Alone!: A Case Study In Alas Purwo National Park, East Java, Indonesia en_US
dc.type Article en_US
dc.UNHAS.email riezzy2000@yahoo.com.au en_US
dc.UNHAS.Fakultas Kehutanan en_US
dc.UNHAS.Prodi Kehutanan en_US
dc.UNHAS.idno 19770317200501 2 001 en_US

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