Impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north Pacific

Impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north Pacific

The measure of the environmental impact of a sand dam in the Estero de Punta Banda is presented. The dam is part of the installations of an oil well jackets factory that was never finished. The purpose of the study is to evaluate the change in the benthic community in the dam area. The methodology p...

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Hovedforfatter: Villarreal-Chávez, G
Format: Online
Sprog:eng
Udgivet: Iniversidad Autónoma de Baja California 1991
Online adgang:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/842
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spelling oai:cienciasmarinas.com.mx:article-8422020-09-10T19:57:23Z Impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north Pacific Impacto de la construcción de un dique arenoso en la ecología bentónica de un estuario en el Pacífico norte de México Villarreal-Chávez, G n/a n/a The measure of the environmental impact of a sand dam in the Estero de Punta Banda is presented. The dam is part of the installations of an oil well jackets factory that was never finished. The purpose of the study is to evaluate the change in the benthic community in the dam area. The methodology proposed by Green (1979) in the suboptimal design was followed. Magnitude of change was searched by community ordination, with principal components technique and index of biological value. ANOVA test and the community ordination show a clear distinction between the dam area and the comparison areas. Descriptive indexes show that the dam biota is intermediate, between the control areas with influence of marsh and human activities. An ecological impact is assumed, consisting in the change of the sediment, with effects in food availability and risk of bird predation. The impact indicates that the system is frail to human encroachment. Se presentan los resultados de la medición del impacto de un dique arenoso construido en el Estero de Punta Banda, Baja California. Este forma parte de las instalaciones de una fábrica de partes para pozos petroleros que no fue terminada. El objetivo de este estudio es evaluar el cambio de la comunidad bentónica del área adyacente al dique comparándola con áreas cercanas que se asume son parecidas a las condiciones originales. La metodología usada es la propuesta por Green (1979), en lo que llama diseño subóptimo con variaciones en el espacio. La magnitud del cambio fue medida por los métodos de ordenación de comunidades, mediante la técnica de los componentes principales y por el índice de valor biológico de las especies. Los análisis de comparación por ANOVA y de ordenación de comunidades muestran una clara distinción entre las áreas del dique y las de comparación. Los índices descriptivos muestran que las condiciones de la biota del dique son intermedias a las de los controles con marisma adyacente y controles con influencia de actividad humana. Se concluye la existencia de un impacto, consistente en el cambio del tipo de sedimento y en su contenido de materia orgánica. Esto a su vez cambia las condiciones de alimentación de los animales bentónicos y facilita la depredación por aves. Las características del cambio en la zona de estudio parecen significar que el sistema es sensible a alteraciones provocadas por construcciones humanas. Iniversidad Autónoma de Baja California 1991-03-06 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/842 10.7773/cm.v17i4.842 Ciencias Marinas; Vol. 17 No. 4 (1991); 105-119 Ciencias Marinas; Vol. 17 Núm. 4 (1991); 105-119 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/842/764
institution Ciencias Marinas
collection OJS
language eng
format Online
author Villarreal-Chávez, G
spellingShingle Villarreal-Chávez, G
Impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north Pacific
author_facet Villarreal-Chávez, G
author_sort Villarreal-Chávez, G
title Impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north Pacific
title_short Impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north Pacific
title_full Impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north Pacific
title_fullStr Impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north Pacific
title_full_unstemmed Impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north Pacific
title_sort impact of the construction of a sand dam on the benthic ecology of an estuary in the mexican north pacific
description The measure of the environmental impact of a sand dam in the Estero de Punta Banda is presented. The dam is part of the installations of an oil well jackets factory that was never finished. The purpose of the study is to evaluate the change in the benthic community in the dam area. The methodology proposed by Green (1979) in the suboptimal design was followed. Magnitude of change was searched by community ordination, with principal components technique and index of biological value. ANOVA test and the community ordination show a clear distinction between the dam area and the comparison areas. Descriptive indexes show that the dam biota is intermediate, between the control areas with influence of marsh and human activities. An ecological impact is assumed, consisting in the change of the sediment, with effects in food availability and risk of bird predation. The impact indicates that the system is frail to human encroachment.
publisher Iniversidad Autónoma de Baja California
publishDate 1991
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/842
_version_ 1715724018120654848

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