Density, spatial distribution and mortality rate of the sea urchin Diadema mexicanum (Diadematoida: Diadematidae) at two reefs of Bahías de Huatulco, Oaxaca, Mexico
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| Format: | Artículo científico |
| Language: | en |
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Universidad de Costa Rica
2015
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| author | Julia Patricia Díaz-Martínez |
| author_facet | Julia Patricia Díaz-Martínez |
| contents | Density, spatial distribution and mortality rate of the sea urchin Diadema mexicanum (Diadematoida: Diadematidae) at two reefs of Bahías de Huatulco, Oaxaca, Mexico Julia Patricia Díaz-Martínez Francisco Benítez-Villalobos Antonio López-Serrano Biología Echinoidea black urchin Echinodermata Population ecology Mexican south Pacific Diadema mexicanum , a conspicuous inhabitant along the Mexican Pacific coast, is a key species for the dynamics of coral reefs; nevertheless, studies on population dynamics for this species are scarce. Monthly sampling was carried out between April 2008 and March 2009 at Isla Montosa and La Entrega, Oaxaca, Mexico using belt transects. Population density was estimated as well as abundance using Zippin’s model. The relation - ship of density with sea-bottom temperature, salinity, pH, and pluvial precipitation was analyzed using a step by step multiple regression analysis. Spatial distribution was analyzed using Morisita’s, Poisson and negative binomial models. Natural mortality rate was calculated using modified Berry ’ s model. Mean density was 3.4 ± 0.66 ind·m -2 in La Entrega and 1.2 ± 0.4 ind·m -2 in Isla Montosa. Abundance of D. mexicanum in La Entrega was 12166 ± 25 individuals and 2675 ± 33 individuals in Isla Montosa. In Isla Montosa there was a positive relationship of density with salinity and negative with sea-bottom temperature, whereas in La Entrega there was not a significant relationship of density with any recorded environmental variable. Monthly mortality rate was 0.10 in La Entrega and 0.15 in Isla Montosa. Spatial distribution pattern was aggregated for both localities dur - ing the sampling period with oscillations in the intensity of aggregation. Higher density and abundance, and a low mortality rate, indicate better conditions for the population of D. mexicanum in La Entrega, contrasting with those of Isla Montosa where apparently there are more stressful conditions associated to stronger oceanographic conditions and a higher sedimentation rate resulting from the proximity of the Copalita River. Rev. Biol. Trop. 63 (Suppl. 2): 173-182. Epub 2015 June 01. 2015 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44943929014 https://www.redalyc.org/journal/449/44943929014/ https://www.redalyc.org/journal/449/44943929014/html/ https://www.redalyc.org/journal/449/44943929014/44943929014.epub https://www.redalyc.org/journal/449/44943929014/movil en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.2 Vol.63 |
| format | Artículo científico |
| id | redalyc_44943929014 |
| institution | Redalyc |
| language | en |
| publishDate | 2015 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Density, spatial distribution and mortality rate of the sea urchin Diadema mexicanum (Diadematoida: Diadematidae) at two reefs of Bahías de Huatulco, Oaxaca, Mexico Julia Patricia Díaz-Martínez Biología Echinoidea black urchin Echinodermata Population ecology Mexican south Pacific Density, spatial distribution and mortality rate of the sea urchin Diadema mexicanum (Diadematoida: Diadematidae) at two reefs of Bahías de Huatulco, Oaxaca, Mexico Julia Patricia Díaz-Martínez Francisco Benítez-Villalobos Antonio López-Serrano Biología Echinoidea black urchin Echinodermata Population ecology Mexican south Pacific Diadema mexicanum , a conspicuous inhabitant along the Mexican Pacific coast, is a key species for the dynamics of coral reefs; nevertheless, studies on population dynamics for this species are scarce. Monthly sampling was carried out between April 2008 and March 2009 at Isla Montosa and La Entrega, Oaxaca, Mexico using belt transects. Population density was estimated as well as abundance using Zippin’s model. The relation - ship of density with sea-bottom temperature, salinity, pH, and pluvial precipitation was analyzed using a step by step multiple regression analysis. Spatial distribution was analyzed using Morisita’s, Poisson and negative binomial models. Natural mortality rate was calculated using modified Berry ’ s model. Mean density was 3.4 ± 0.66 ind·m -2 in La Entrega and 1.2 ± 0.4 ind·m -2 in Isla Montosa. Abundance of D. mexicanum in La Entrega was 12166 ± 25 individuals and 2675 ± 33 individuals in Isla Montosa. In Isla Montosa there was a positive relationship of density with salinity and negative with sea-bottom temperature, whereas in La Entrega there was not a significant relationship of density with any recorded environmental variable. Monthly mortality rate was 0.10 in La Entrega and 0.15 in Isla Montosa. Spatial distribution pattern was aggregated for both localities dur - ing the sampling period with oscillations in the intensity of aggregation. Higher density and abundance, and a low mortality rate, indicate better conditions for the population of D. mexicanum in La Entrega, contrasting with those of Isla Montosa where apparently there are more stressful conditions associated to stronger oceanographic conditions and a higher sedimentation rate resulting from the proximity of the Copalita River. Rev. Biol. Trop. 63 (Suppl. 2): 173-182. Epub 2015 June 01. 2015 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44943929014 https://www.redalyc.org/journal/449/44943929014/ https://www.redalyc.org/journal/449/44943929014/html/ https://www.redalyc.org/journal/449/44943929014/44943929014.epub https://www.redalyc.org/journal/449/44943929014/movil en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.2 Vol.63 |
| title | Density, spatial distribution and mortality rate of the sea urchin Diadema mexicanum (Diadematoida: Diadematidae) at two reefs of Bahías de Huatulco, Oaxaca, Mexico |
| topic | Biología Echinoidea black urchin Echinodermata Population ecology Mexican south Pacific |
| url | https://www.redalyc.org/articulo.oa?id=44943929014 https://www.redalyc.org/journal/449/44943929014/ https://www.redalyc.org/journal/449/44943929014/html/ https://www.redalyc.org/journal/449/44943929014/44943929014.epub https://www.redalyc.org/journal/449/44943929014/movil |