Impact of rain forest fragmentation on the population size of a structurally important palm species: Astrocaryum mexicanum at Los Tuxtlas, Mexico

Forest fragmentation changes the structure of natural landscapes causing shifts on the distribution and abundance of plant species that could lead to population extinctions. The tree palm Astrocaryum mexicanum is one of the most abundant plant species in the Los Tuxtlas region, Mexico. Nevertheless,...

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Veröffentlicht in:Biological conservation 2007-08, Vol.138 (1), p.198-206
Hauptverfasser: Arroyo-Rodríguez, Víctor, Aguirre, Armando, Benítez-Malvido, Julieta, Mandujano, Salvador
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creator Arroyo-Rodríguez, Víctor
Aguirre, Armando
Benítez-Malvido, Julieta
Mandujano, Salvador
description Forest fragmentation changes the structure of natural landscapes causing shifts on the distribution and abundance of plant species that could lead to population extinctions. The tree palm Astrocaryum mexicanum is one of the most abundant plant species in the Los Tuxtlas region, Mexico. Nevertheless, 95% of the original rain forest in this region has disappeared, and remaining palm populations are present within landscapes that differ in their conservation status. To identify the landscape (e.g., amount of forest cover, fragment size, fragment shape and isolation) and vegetation (e.g., plant species richness, density and basal area) attributes that could influence the adult population size of A. mexicanum, we analyzed 45 forest fragments (
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The tree palm Astrocaryum mexicanum is one of the most abundant plant species in the Los Tuxtlas region, Mexico. Nevertheless, 95% of the original rain forest in this region has disappeared, and remaining palm populations are present within landscapes that differ in their conservation status. To identify the landscape (e.g., amount of forest cover, fragment size, fragment shape and isolation) and vegetation (e.g., plant species richness, density and basal area) attributes that could influence the adult population size of A. mexicanum, we analyzed 45 forest fragments (&lt;1–266 ha) distributed in three landscapes that encompassed different levels of fragmentation, and compared with the population inhabiting the Los Tuxtlas Field Station (700 ha). Fragmentation affected the population size of A. mexicanum, with the smaller, most isolated and irregular forest fragments showing the lower number of individuals. The importance value index of A. mexicanum was greater in the most conserved landscape. Furthermore, palm density was positively correlated with species richness, density and basal area of old-growth forest species, but negatively correlated with richness of secondary forest species. Overall, the strong decline in population size of adult reproductive palms may affect the regeneration and genetic diversity of this species increasing its probability of extinction. 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The tree palm Astrocaryum mexicanum is one of the most abundant plant species in the Los Tuxtlas region, Mexico. Nevertheless, 95% of the original rain forest in this region has disappeared, and remaining palm populations are present within landscapes that differ in their conservation status. To identify the landscape (e.g., amount of forest cover, fragment size, fragment shape and isolation) and vegetation (e.g., plant species richness, density and basal area) attributes that could influence the adult population size of A. mexicanum, we analyzed 45 forest fragments (&lt;1–266 ha) distributed in three landscapes that encompassed different levels of fragmentation, and compared with the population inhabiting the Los Tuxtlas Field Station (700 ha). Fragmentation affected the population size of A. mexicanum, with the smaller, most isolated and irregular forest fragments showing the lower number of individuals. The importance value index of A. mexicanum was greater in the most conserved landscape. Furthermore, palm density was positively correlated with species richness, density and basal area of old-growth forest species, but negatively correlated with richness of secondary forest species. Overall, the strong decline in population size of adult reproductive palms may affect the regeneration and genetic diversity of this species increasing its probability of extinction. 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Endangered species: population survey and restocking</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Arroyo-Rodríguez, Víctor</creatorcontrib><creatorcontrib>Aguirre, Armando</creatorcontrib><creatorcontrib>Benítez-Malvido, Julieta</creatorcontrib><creatorcontrib>Mandujano, Salvador</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Environment Abstracts</collection><collection>Ecology Abstracts</collection><collection>Sustainability Science Abstracts</collection><jtitle>Biological conservation</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Arroyo-Rodríguez, Víctor</au><au>Aguirre, Armando</au><au>Benítez-Malvido, Julieta</au><au>Mandujano, Salvador</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Impact of rain forest fragmentation on the population size of a structurally important palm species: Astrocaryum mexicanum at Los Tuxtlas, Mexico</atitle><jtitle>Biological conservation</jtitle><date>2007-08-01</date><risdate>2007</risdate><volume>138</volume><issue>1</issue><spage>198</spage><epage>206</epage><pages>198-206</pages><issn>0006-3207</issn><eissn>1873-2917</eissn><coden>BICOBK</coden><abstract>Forest fragmentation changes the structure of natural landscapes causing shifts on the distribution and abundance of plant species that could lead to population extinctions. 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subjects Animal, plant and microbial ecology
Applied ecology
Arecaceae
Astrocaryum mexicanum
Biological and medical sciences
Common species
Conservation, protection and management of environment and wildlife
Edge effect
Forest fragmentation
Forestry
Fundamental and applied biological sciences. Psychology
General forest ecology
Generalities. Production, biomass. Quality of wood and forest products. General forest ecology
Isolation
Landscapes
Parks, reserves, wildlife conservation. Endangered species: population survey and restocking
title Impact of rain forest fragmentation on the population size of a structurally important palm species: Astrocaryum mexicanum at Los Tuxtlas, Mexico
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