Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of Chile

Human impact such as forest fragmentation and degradation may have strong effects on native and exotic plant communities. In addition, these human-caused disturbances occur mostly in lowlands producing greater fragmentation and degradation there than in higher elevations. Plant invasion should be gr...

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Autores principales:	ROJAS,ISABEL, BECERRA,PABLO, GÁLVEZ,NICOLÁS, LAKER,JERRY, BONACIC,CRISTIÁN, HESTER,ALISON
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2011
Materias:	Fragmentation forest degradation elevation gradient invasion plant diversity
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200006
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spelling	oai:scielo:S0717-664320110002000062012-06-19Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of ChileROJAS,ISABELBECERRA,PABLOGÁLVEZ,NICOLÁSLAKER,JERRYBONACIC,CRISTIÁNHESTER,ALISON Fragmentation forest degradation elevation gradient invasion plant diversity Human impact such as forest fragmentation and degradation may have strong effects on native and exotic plant communities. In addition, these human-caused disturbances occur mostly in lowlands producing greater fragmentation and degradation there than in higher elevations. Plant invasion should be greater in more fragmented and degraded forests and hence lowlands should be more invaded than higher elevations. In turn, native species richness should be negatively related to fragmentation and degradation and hence greater in higher elevations within a forest type or elevation belt. We assessed these hypotheses in an Andean temperate forest of southern Chile, Araucanía Region. We recorded the vascular plant composition in twelve fragments of different size, perimeter/area, elevation level and evidence of human degradation (logging, fire, cattle faeces). Based on these variables we performed a fragmentation and a degradation index. Pearson correlations were used to analyze the relationship between all these variables. We found that fragmentation and degradation were positively correlated, and each of them decreased with altitude. Furthermore, fragmentation and degradation affected native and exotic species richness in different ways. Invasion was enhanced by both fragmentation and degradation, and as consequence of the altitudinal patterns of these human-caused disturbances, invasion seems to occur mainly in lowlands. In turn, native species richness decreased with fragmentation, and it was not related to degradation nor altitude.info:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana. Botánica v.68 n.2 20112011-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200006en10.4067/S0717-66432011000200006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Fragmentation forest degradation elevation gradient invasion plant diversity
spellingShingle	Fragmentation forest degradation elevation gradient invasion plant diversity ROJAS,ISABEL BECERRA,PABLO GÁLVEZ,NICOLÁS LAKER,JERRY BONACIC,CRISTIÁN HESTER,ALISON Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of Chile
description	Human impact such as forest fragmentation and degradation may have strong effects on native and exotic plant communities. In addition, these human-caused disturbances occur mostly in lowlands producing greater fragmentation and degradation there than in higher elevations. Plant invasion should be greater in more fragmented and degraded forests and hence lowlands should be more invaded than higher elevations. In turn, native species richness should be negatively related to fragmentation and degradation and hence greater in higher elevations within a forest type or elevation belt. We assessed these hypotheses in an Andean temperate forest of southern Chile, Araucanía Region. We recorded the vascular plant composition in twelve fragments of different size, perimeter/area, elevation level and evidence of human degradation (logging, fire, cattle faeces). Based on these variables we performed a fragmentation and a degradation index. Pearson correlations were used to analyze the relationship between all these variables. We found that fragmentation and degradation were positively correlated, and each of them decreased with altitude. Furthermore, fragmentation and degradation affected native and exotic species richness in different ways. Invasion was enhanced by both fragmentation and degradation, and as consequence of the altitudinal patterns of these human-caused disturbances, invasion seems to occur mainly in lowlands. In turn, native species richness decreased with fragmentation, and it was not related to degradation nor altitude.
author	ROJAS,ISABEL BECERRA,PABLO GÁLVEZ,NICOLÁS LAKER,JERRY BONACIC,CRISTIÁN HESTER,ALISON
author_facet	ROJAS,ISABEL BECERRA,PABLO GÁLVEZ,NICOLÁS LAKER,JERRY BONACIC,CRISTIÁN HESTER,ALISON
author_sort	ROJAS,ISABEL
title	Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of Chile
title_short	Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of Chile
title_full	Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of Chile
title_fullStr	Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of Chile
title_full_unstemmed	Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of Chile
title_sort	relationship between fragmentation, degradation and native and exotic species richness in an andean temperate forest of chile
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2011
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432011000200006
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Relationship between fragmentation, degradation and native and exotic species richness in an Andean temperate forest of Chile

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