Density, size, and biomass of Diadema mexicanum (Echinoidea) in Eastern Tropical Pacific coral reefs

Diadema is among the most abundant, widely dispersed, and ecologically important genera of sea urchin in tropical shallow waters. D. mexicanum is distributed from the Gulf of California to northern Peru, including the oceanic islands of Revillagigedo, Clipperton, Coco, Malpelo, and Galápagos, and it...

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Autores principales:	JJ Alvarado, J Cortés, H Guzman, H Reyes-Bonilla
Formato:	article
Lenguaje:	EN
Publicado:	Inter-Research 2016
Materias:	Biology (General) QH301-705.5 Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/6bb4cc5d78f74c7994b321de23391544
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spelling	oai:doaj.org-article:6bb4cc5d78f74c7994b321de233915442021-11-18T09:19:04ZDensity, size, and biomass of Diadema mexicanum (Echinoidea) in Eastern Tropical Pacific coral reefs1864-77821864-779010.3354/ab00645https://doaj.org/article/6bb4cc5d78f74c7994b321de233915442016-01-01T00:00:00Zhttps://www.int-res.com/abstracts/ab/v24/n3/p151-161/https://doaj.org/toc/1864-7782https://doaj.org/toc/1864-7790Diadema is among the most abundant, widely dispersed, and ecologically important genera of sea urchin in tropical shallow waters. D. mexicanum is distributed from the Gulf of California to northern Peru, including the oceanic islands of Revillagigedo, Clipperton, Coco, Malpelo, and Galápagos, and it is one of the most important sea urchin species in Eastern Tropical Pacific (ETP) coral reefs. In the 1980s, El Niño caused high coral mortality, resulting in an increase in macroalgal cover. This resulted in higher sea urchin bioerosion activity, which weakened the reef frameworks. Considering the high vulnerability of the ETP coral reefs, the aim of this study was to determine regional differences in the density, size (test diameter), and biomass of D. mexicanum at 12 localities in 4 countries between 2009 and 2010, and to determine possible causes of these differences. The average density, size, and biomass of D. mexicanum were 0.47 ± 0.15 ind. m-2, 4.38 ± 1.50 cm, and 0.26 ± 0.33 g m-2. The test size frequency that predominated was 2 to 3 cm. Predation by macrophagous fishes seems to be one of the most important factors that explains the presence of low densities and small size of sea urchins throughout the region. The increase in D. mexicanum predators is probably a result of overfishing of top predators.JJ AlvaradoJ CortésH GuzmanH Reyes-BonillaInter-ResearcharticleBiology (General)QH301-705.5MicrobiologyQR1-502ENAquatic Biology, Vol 24, Iss 3, Pp 151-161 (2016)
institution	DOAJ
collection	DOAJ
language	EN
topic	Biology (General) QH301-705.5 Microbiology QR1-502
spellingShingle	Biology (General) QH301-705.5 Microbiology QR1-502 JJ Alvarado J Cortés H Guzman H Reyes-Bonilla Density, size, and biomass of Diadema mexicanum (Echinoidea) in Eastern Tropical Pacific coral reefs
description	Diadema is among the most abundant, widely dispersed, and ecologically important genera of sea urchin in tropical shallow waters. D. mexicanum is distributed from the Gulf of California to northern Peru, including the oceanic islands of Revillagigedo, Clipperton, Coco, Malpelo, and Galápagos, and it is one of the most important sea urchin species in Eastern Tropical Pacific (ETP) coral reefs. In the 1980s, El Niño caused high coral mortality, resulting in an increase in macroalgal cover. This resulted in higher sea urchin bioerosion activity, which weakened the reef frameworks. Considering the high vulnerability of the ETP coral reefs, the aim of this study was to determine regional differences in the density, size (test diameter), and biomass of D. mexicanum at 12 localities in 4 countries between 2009 and 2010, and to determine possible causes of these differences. The average density, size, and biomass of D. mexicanum were 0.47 ± 0.15 ind. m-2, 4.38 ± 1.50 cm, and 0.26 ± 0.33 g m-2. The test size frequency that predominated was 2 to 3 cm. Predation by macrophagous fishes seems to be one of the most important factors that explains the presence of low densities and small size of sea urchins throughout the region. The increase in D. mexicanum predators is probably a result of overfishing of top predators.
format	article
author	JJ Alvarado J Cortés H Guzman H Reyes-Bonilla
author_facet	JJ Alvarado J Cortés H Guzman H Reyes-Bonilla
author_sort	JJ Alvarado
title	Density, size, and biomass of Diadema mexicanum (Echinoidea) in Eastern Tropical Pacific coral reefs
title_short	Density, size, and biomass of Diadema mexicanum (Echinoidea) in Eastern Tropical Pacific coral reefs
title_full	Density, size, and biomass of Diadema mexicanum (Echinoidea) in Eastern Tropical Pacific coral reefs
title_fullStr	Density, size, and biomass of Diadema mexicanum (Echinoidea) in Eastern Tropical Pacific coral reefs
title_full_unstemmed	Density, size, and biomass of Diadema mexicanum (Echinoidea) in Eastern Tropical Pacific coral reefs
title_sort	density, size, and biomass of diadema mexicanum (echinoidea) in eastern tropical pacific coral reefs
publisher	Inter-Research
publishDate	2016
url	https://doaj.org/article/6bb4cc5d78f74c7994b321de23391544
work_keys_str_mv	AT jjalvarado densitysizeandbiomassofdiademamexicanumechinoideaineasterntropicalpacificcoralreefs AT jcortes densitysizeandbiomassofdiademamexicanumechinoideaineasterntropicalpacificcoralreefs AT hguzman densitysizeandbiomassofdiademamexicanumechinoideaineasterntropicalpacificcoralreefs AT hreyesbonilla densitysizeandbiomassofdiademamexicanumechinoideaineasterntropicalpacificcoralreefs
_version_	1718420906911465472

Density, size, and biomass of Diadema mexicanum (Echinoidea) in Eastern Tropical Pacific coral reefs

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