Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population--a dispersal model approach.

Recruitment constraints on Singapore's dwindling fluted giant clam, Tridacna squamosa, population were studied by modelling fertilisation, larval transport, and settlement using real-time hydrodynamic forcing combined with knowledge of spawning characteristics, larval development, behaviour, an...

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Autores principales:	Mei Lin Neo, Paul L A Erftemeijer, Jan K L van Beek, Dirk S van Maren, Serena L-M Teo, Peter A Todd
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/2aee0d8bd9ba4074921f1a7789fe5ce2
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spelling	oai:doaj.org-article:2aee0d8bd9ba4074921f1a7789fe5ce22021-11-18T07:53:31ZRecruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population--a dispersal model approach.1932-620310.1371/journal.pone.0058819https://doaj.org/article/2aee0d8bd9ba4074921f1a7789fe5ce22013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23555597/?tool=EBIhttps://doaj.org/toc/1932-6203Recruitment constraints on Singapore's dwindling fluted giant clam, Tridacna squamosa, population were studied by modelling fertilisation, larval transport, and settlement using real-time hydrodynamic forcing combined with knowledge of spawning characteristics, larval development, behaviour, and settlement cues. Larval transport was simulated using a finite-volume advection-diffusion model coupled to a three-dimensional hydrodynamic model. Three recruitment constraint hypotheses were tested: 1) there is limited connectivity between Singapore's reefs and other reefs in the region, 2) there is limited exchange within Singapore's Southern Islands, and 3) there exist low-density constraints to fertilisation efficacy (component Allee effects). Results showed that connectivity among giant clam populations was primarily determined by residual hydrodynamic flows and spawning time, with greatest chances of successful settlement occurring when spawning and subsequent larval dispersal coincided with the period of lowest residual flow. Simulations suggested poor larval transport from reefs located along the Peninsular Malaysia to Singapore, probably due to strong surface currents between the Andaman Sea and South China Sea combined with a major land barrier disrupting larval movement among reefs. The model, however, predicted offshore coral reefs to the southeast of Singapore (Bintan and Batam) may represent a significant source of larvae. Larval exchange within Singapore's Southern Islands varied substantially depending on the locations of source and sink reefs as well as spawning time; but all simulations resulted in low settler densities (2.1-68.6 settled individuals per 10,000 m(2)). Poor fertilisation rates predicted by the model indicate that the low density and scattered distribution of the remaining T. squamosa in Singapore are likely to significantly inhibit any natural recovery of local stocks.Mei Lin NeoPaul L A ErftemeijerJan K L van BeekDirk S van MarenSerena L-M TeoPeter A ToddPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 3, p e58819 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Mei Lin Neo Paul L A Erftemeijer Jan K L van Beek Dirk S van Maren Serena L-M Teo Peter A Todd Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population--a dispersal model approach.
description	Recruitment constraints on Singapore's dwindling fluted giant clam, Tridacna squamosa, population were studied by modelling fertilisation, larval transport, and settlement using real-time hydrodynamic forcing combined with knowledge of spawning characteristics, larval development, behaviour, and settlement cues. Larval transport was simulated using a finite-volume advection-diffusion model coupled to a three-dimensional hydrodynamic model. Three recruitment constraint hypotheses were tested: 1) there is limited connectivity between Singapore's reefs and other reefs in the region, 2) there is limited exchange within Singapore's Southern Islands, and 3) there exist low-density constraints to fertilisation efficacy (component Allee effects). Results showed that connectivity among giant clam populations was primarily determined by residual hydrodynamic flows and spawning time, with greatest chances of successful settlement occurring when spawning and subsequent larval dispersal coincided with the period of lowest residual flow. Simulations suggested poor larval transport from reefs located along the Peninsular Malaysia to Singapore, probably due to strong surface currents between the Andaman Sea and South China Sea combined with a major land barrier disrupting larval movement among reefs. The model, however, predicted offshore coral reefs to the southeast of Singapore (Bintan and Batam) may represent a significant source of larvae. Larval exchange within Singapore's Southern Islands varied substantially depending on the locations of source and sink reefs as well as spawning time; but all simulations resulted in low settler densities (2.1-68.6 settled individuals per 10,000 m(2)). Poor fertilisation rates predicted by the model indicate that the low density and scattered distribution of the remaining T. squamosa in Singapore are likely to significantly inhibit any natural recovery of local stocks.
format	article
author	Mei Lin Neo Paul L A Erftemeijer Jan K L van Beek Dirk S van Maren Serena L-M Teo Peter A Todd
author_facet	Mei Lin Neo Paul L A Erftemeijer Jan K L van Beek Dirk S van Maren Serena L-M Teo Peter A Todd
author_sort	Mei Lin Neo
title	Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population--a dispersal model approach.
title_short	Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population--a dispersal model approach.
title_full	Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population--a dispersal model approach.
title_fullStr	Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population--a dispersal model approach.
title_full_unstemmed	Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population--a dispersal model approach.
title_sort	recruitment constraints in singapore's fluted giant clam (tridacna squamosa) population--a dispersal model approach.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/2aee0d8bd9ba4074921f1a7789fe5ce2
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Recruitment constraints in Singapore's fluted giant clam (Tridacna squamosa) population--a dispersal model approach.

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