Hatching Failure In Ex-Situ Nests Of Hawksbill Turtle (Eretmochelys Imbricata) In Melaka, Malaysia

Hawksbill turtle (Eretmochelys imbricata, Linnaeus 1766) nesting in Melaka, Malaysia faces enormous pressures from various human activities along its coastline. The hatchery of the Department of Fisheries at Padang Kemunting, Melaka provides an important ex-situ conservation and management tool as t...

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Main Author: See, Khai Wei
Format: Thesis
Language:English
Published: 2022
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Online Access:http://eprints.usm.my/60594/1/SEE%20KHAI%20WEI%20-%20TESIS%20cut.pdf
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spelling my-usm-ep.605942024-05-08T07:30:42Z Hatching Failure In Ex-Situ Nests Of Hawksbill Turtle (Eretmochelys Imbricata) In Melaka, Malaysia 2022-08 See, Khai Wei QH1 Natural history (General - Including nature conservation, geographical distribution) Hawksbill turtle (Eretmochelys imbricata, Linnaeus 1766) nesting in Melaka, Malaysia faces enormous pressures from various human activities along its coastline. The hatchery of the Department of Fisheries at Padang Kemunting, Melaka provides an important ex-situ conservation and management tool as threats such as egg poaching, inundation, and natural predation are prevalent at nesting beaches. Ex-situ conservation has been implicated in causing low hatching success to sea turtle nests. This study aims to identify the factors that contribute to hatching failure in ex-situ nests of hawksbill turtle using several approaches during three nesting seasons from 2018 to 2020, from 13 nesting beaches in Melaka. To analyse hatching success and egg mortality, post-emergence nest excavation was conducted on 241 clutches to determine the number of successfully hatched eggs and the stages of the unhatched eggs. The mean hatching success was 58.2 ± 28.2% (n = 241). Among the unhatched eggs (n = 9,872), 70.8% were undeveloped, 11.2% were in early embryonic stage, 1.1% were in mid embryonic stage, 6.3% were in late embryonic stage, 5.3% were depredated, and another 5.3% were decayed. Analysing eight potential determinants, only two variables were found to affect hatching success or egg mortality in this study, which were the incubation period and clutch size of the nests. The large number of undeveloped eggs led to the concern that the eggs were unfertilised. Egg fertility was determined using the white spot method conducted at the beginning of egg incubation on 50 clutches. The mean egg fertility was 85.9 ± 16.5% (n = 50), but the mean hatching success was significantly lower at 57.6 ± 24.3% (n = 50). 2022-08 Thesis http://eprints.usm.my/60594/ http://eprints.usm.my/60594/1/SEE%20KHAI%20WEI%20-%20TESIS%20cut.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Sains Kajihayat
institution Universiti Sains Malaysia
collection USM Institutional Repository
language English
topic QH1 Natural history (General - Including nature conservation
geographical distribution)
spellingShingle QH1 Natural history (General - Including nature conservation
geographical distribution)
See, Khai Wei
Hatching Failure In Ex-Situ Nests Of Hawksbill Turtle (Eretmochelys Imbricata) In Melaka, Malaysia
description Hawksbill turtle (Eretmochelys imbricata, Linnaeus 1766) nesting in Melaka, Malaysia faces enormous pressures from various human activities along its coastline. The hatchery of the Department of Fisheries at Padang Kemunting, Melaka provides an important ex-situ conservation and management tool as threats such as egg poaching, inundation, and natural predation are prevalent at nesting beaches. Ex-situ conservation has been implicated in causing low hatching success to sea turtle nests. This study aims to identify the factors that contribute to hatching failure in ex-situ nests of hawksbill turtle using several approaches during three nesting seasons from 2018 to 2020, from 13 nesting beaches in Melaka. To analyse hatching success and egg mortality, post-emergence nest excavation was conducted on 241 clutches to determine the number of successfully hatched eggs and the stages of the unhatched eggs. The mean hatching success was 58.2 ± 28.2% (n = 241). Among the unhatched eggs (n = 9,872), 70.8% were undeveloped, 11.2% were in early embryonic stage, 1.1% were in mid embryonic stage, 6.3% were in late embryonic stage, 5.3% were depredated, and another 5.3% were decayed. Analysing eight potential determinants, only two variables were found to affect hatching success or egg mortality in this study, which were the incubation period and clutch size of the nests. The large number of undeveloped eggs led to the concern that the eggs were unfertilised. Egg fertility was determined using the white spot method conducted at the beginning of egg incubation on 50 clutches. The mean egg fertility was 85.9 ± 16.5% (n = 50), but the mean hatching success was significantly lower at 57.6 ± 24.3% (n = 50).
format Thesis
qualification_level Master's degree
author See, Khai Wei
author_facet See, Khai Wei
author_sort See, Khai Wei
title Hatching Failure In Ex-Situ Nests Of Hawksbill Turtle (Eretmochelys Imbricata) In Melaka, Malaysia
title_short Hatching Failure In Ex-Situ Nests Of Hawksbill Turtle (Eretmochelys Imbricata) In Melaka, Malaysia
title_full Hatching Failure In Ex-Situ Nests Of Hawksbill Turtle (Eretmochelys Imbricata) In Melaka, Malaysia
title_fullStr Hatching Failure In Ex-Situ Nests Of Hawksbill Turtle (Eretmochelys Imbricata) In Melaka, Malaysia
title_full_unstemmed Hatching Failure In Ex-Situ Nests Of Hawksbill Turtle (Eretmochelys Imbricata) In Melaka, Malaysia
title_sort hatching failure in ex-situ nests of hawksbill turtle (eretmochelys imbricata) in melaka, malaysia
granting_institution Universiti Sains Malaysia
granting_department Pusat Pengajian Sains Kajihayat
publishDate 2022
url http://eprints.usm.my/60594/1/SEE%20KHAI%20WEI%20-%20TESIS%20cut.pdf
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