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
Subjects:	QH1 Natural history (General - Including nature conservation geographical distribution)
Online Access:	http://eprints.usm.my/60594/1/SEE%20KHAI%20WEI%20-%20TESIS%20cut.pdf
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id	my-usm-ep.60594
record_format	uketd_dc
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
_version_	1804888970131144704

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

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