Spatio-temporal changes in the trophic structure of Rocky intertidal mollusc assemblages on a Tropical shore

Spatio-temporal changes in the trophic structure of Rocky intertidal mollusc assemblages on a Tropical shore

Patterns of the distribution and temporal variation of trophic groups within a benthic mollusk asemblage of a tropical shore (eastern tropical Pacific) were analysed in this study. Four intertidal rocky sites with different wave exposure were studied. A three-factor analysis of variance (fixed facto...

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Autores principales: Olabarria, C, Carballo, JL, Vega, C
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2001
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/461
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spelling oai:cienciasmarinas.com.mx:article-4612019-05-09T19:27:43Z Spatio-temporal changes in the trophic structure of Rocky intertidal mollusc assemblages on a Tropical shore Cambios espaciotemporales en la estructura trófica de asociaciones de moluscos del intermareal rocoso en un sustrato tropical Olabarria, C Carballo, JL Vega, C molluscs trophic structure rocky intertidal multivariant analysis eastern tropical Pacific moluscos estructura trófica intermareal rocoso análisis multivariantes Pacífico tropical oriental Patterns of the distribution and temporal variation of trophic groups within a benthic mollusk asemblage of a tropical shore (eastern tropical Pacific) were analysed in this study. Four intertidal rocky sites with different wave exposure were studied. A three-factor analysis of variance (fixed factors: trophic groups and level of exposure; random factor: site) and the Student-Newman-Keuls a posteriori test (P =0.05) were applied to the biomass of trophic groups in order to know the variation among different sites. Carnivores, herbivores and suspension-feeders varied significantly among sites within each exposure level. Suspension-feeders were more abundant at exposed sites, while herbivores dominated in sheltered places. Biomass of herbivores was not correlated to macroalgal biomass. Total biomass was highest at exposed sites, increasing in winter and decreasing in summer. An ordination analysis carried out with the non-metric multidimensional scaling programme (MDS) revealed two trophic groups: groupA included samples from exposed sites (E1, E2) and group B included samples from sheltered sites (E3, E4). Graphic methods (ABC curves) detected changes along temporal and spatial scales, and these could be related to a high proportion of small species. Factors such as exposure level and type of substrate may control the distribution of different trophic groups. En este estudio se analizaron los patrones de distribución y variación temporal de los grupos tróficos de una asociación de moluscos en un sustrato tropical (Pacífico tropical oriental). Se estudiaron cuatro estaciones intermareales rocosas con diferente grado de exposición al oleaje. Se aplicó un análisis de varianza de tres factores (factores fijos: grupos tróficos y grado de exposición; factor al azar: sitio) y la prueba a posteriori de Student-Newman-Keuls (P = 0.05) con el objeto de conocer la variación entre las diferentes localidades. La biomasa de carnívoros, herbívoros y suspensívoros varió significativamente entre las distintas estaciones dentro de cada nivel de exposición. Los suspensívoros predominaron en áreas expuestas, mientras que los herbívoros dominaron en las estaciones protegidas. La biomasa de herbívoros no se correlacionó con la biomasa de macroalgas. La biomasa total fue mayor en lugares expuestos, mostrando un incremento en invierno y un descenso en verano. Un análisis de ordenación (MDS) reveló la existencia de dos grupos: el grupo A, que incluyó las muestras de los sitios expuestos (E1 y E2); y el grupo B, que incluyó las muestras de los sitios protegidos (E3 y E4). Los métodos gráficos (curvas ABC) detectaron cambios espaciales y temporales que pudieron deberse a la alta proporción de especies pequeñas. Algunos factores como nivel de exposición y tipo de sustrato podrían haber controlado la distribución de los diferentes grupos. Iniversidad Autónoma de Baja California 2001-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/461 10.7773/cm.v27i2.461 Ciencias Marinas; Vol. 27 No. 2 (2001); 235-254 Ciencias Marinas; Vol. 27 Núm. 2 (2001); 235-254 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/461/399
institution Ciencias Marinas
collection OJS
language eng
format Online
author Olabarria, C
Carballo, JL
Vega, C
spellingShingle Olabarria, C
Carballo, JL
Vega, C
Spatio-temporal changes in the trophic structure of Rocky intertidal mollusc assemblages on a Tropical shore
author_facet Olabarria, C
Carballo, JL
Vega, C
author_sort Olabarria, C
title Spatio-temporal changes in the trophic structure of Rocky intertidal mollusc assemblages on a Tropical shore
title_short Spatio-temporal changes in the trophic structure of Rocky intertidal mollusc assemblages on a Tropical shore
title_full Spatio-temporal changes in the trophic structure of Rocky intertidal mollusc assemblages on a Tropical shore
title_fullStr Spatio-temporal changes in the trophic structure of Rocky intertidal mollusc assemblages on a Tropical shore
title_full_unstemmed Spatio-temporal changes in the trophic structure of Rocky intertidal mollusc assemblages on a Tropical shore
title_sort spatio-temporal changes in the trophic structure of rocky intertidal mollusc assemblages on a tropical shore
description Patterns of the distribution and temporal variation of trophic groups within a benthic mollusk asemblage of a tropical shore (eastern tropical Pacific) were analysed in this study. Four intertidal rocky sites with different wave exposure were studied. A three-factor analysis of variance (fixed factors: trophic groups and level of exposure; random factor: site) and the Student-Newman-Keuls a posteriori test (P =0.05) were applied to the biomass of trophic groups in order to know the variation among different sites. Carnivores, herbivores and suspension-feeders varied significantly among sites within each exposure level. Suspension-feeders were more abundant at exposed sites, while herbivores dominated in sheltered places. Biomass of herbivores was not correlated to macroalgal biomass. Total biomass was highest at exposed sites, increasing in winter and decreasing in summer. An ordination analysis carried out with the non-metric multidimensional scaling programme (MDS) revealed two trophic groups: groupA included samples from exposed sites (E1, E2) and group B included samples from sheltered sites (E3, E4). Graphic methods (ABC curves) detected changes along temporal and spatial scales, and these could be related to a high proportion of small species. Factors such as exposure level and type of substrate may control the distribution of different trophic groups.
publisher Iniversidad Autónoma de Baja California
publishDate 2001
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/461
_version_ 1715723971123478528

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