Patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in Chile, South America

The current geographical distribution of alien species could be informative of processes involved in the biological invasions facilitated by humans. Because environmental and anthropic factors affect the geographic distribution of alien plants, we hypothesize that naturalized plants have a non-rando...

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Autores principales:	CASTRO,SERGIO A, JAKSIC,FABIÁN M
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2008
Materias:	Jaccard's index Whittaker's index plant invasions naturalized plants similarity turnover
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000100009
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spelling	oai:scielo:S0716-078X20080001000092008-05-14Patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in Chile, South AmericaCASTRO,SERGIO AJAKSIC,FABIÁN M Jaccard's index Whittaker's index plant invasions naturalized plants similarity turnover The current geographical distribution of alien species could be informative of processes involved in the biological invasions facilitated by humans. Because environmental and anthropic factors affect the geographic distribution of alien plants, we hypothesize that naturalized plants have a non-random distribution along extensive geographical ranges. On the basis of a complete and updated database of naturalized plants in Chile, we analyzed their turnover and floristic similarities among regions that encompass a wide latitudinal gradient in South America. Using Moran's index and Mantel's test we characterized the spatial auto-correlation (regional aggregation) and the effect of geographical distance on the index values. Additionally, we used clustering methods and resampling procedures to detect plant assemblages at regional level. Whittaker's index displayed a positive tilt, increasing according to geographical distance and reaching a plateau; conversely, Jaccard's index was negatively associated with geographical distance. Removing the effect of distance, both Whittaker's and Jaccard's values showed no significant trends. Multivariate analysis combined with resampling procedures revealed the existence of three distinctive plant clusters: Northernmost Chile, Central-southern Chile, and Southernmost Chile. These clusters are characterized by naturalized plants that are not present in the others. Based on this evidence, we conclude that the set of naturalized plants in Chile exhibits a non-random geographical distribution, displaying an ordered geographical pattern across regions (latitude). We discuss the role of the environmental variables (climate, latitude) and land use post-European colonization as factors in the distributional patterns here documentedinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.81 n.1 20082008-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000100009en10.4067/S0716-078X2008000100009
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Jaccard's index Whittaker's index plant invasions naturalized plants similarity turnover
spellingShingle	Jaccard's index Whittaker's index plant invasions naturalized plants similarity turnover CASTRO,SERGIO A JAKSIC,FABIÁN M Patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in Chile, South America
description	The current geographical distribution of alien species could be informative of processes involved in the biological invasions facilitated by humans. Because environmental and anthropic factors affect the geographic distribution of alien plants, we hypothesize that naturalized plants have a non-random distribution along extensive geographical ranges. On the basis of a complete and updated database of naturalized plants in Chile, we analyzed their turnover and floristic similarities among regions that encompass a wide latitudinal gradient in South America. Using Moran's index and Mantel's test we characterized the spatial auto-correlation (regional aggregation) and the effect of geographical distance on the index values. Additionally, we used clustering methods and resampling procedures to detect plant assemblages at regional level. Whittaker's index displayed a positive tilt, increasing according to geographical distance and reaching a plateau; conversely, Jaccard's index was negatively associated with geographical distance. Removing the effect of distance, both Whittaker's and Jaccard's values showed no significant trends. Multivariate analysis combined with resampling procedures revealed the existence of three distinctive plant clusters: Northernmost Chile, Central-southern Chile, and Southernmost Chile. These clusters are characterized by naturalized plants that are not present in the others. Based on this evidence, we conclude that the set of naturalized plants in Chile exhibits a non-random geographical distribution, displaying an ordered geographical pattern across regions (latitude). We discuss the role of the environmental variables (climate, latitude) and land use post-European colonization as factors in the distributional patterns here documented
author	CASTRO,SERGIO A JAKSIC,FABIÁN M
author_facet	CASTRO,SERGIO A JAKSIC,FABIÁN M
author_sort	CASTRO,SERGIO A
title	Patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in Chile, South America
title_short	Patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in Chile, South America
title_full	Patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in Chile, South America
title_fullStr	Patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in Chile, South America
title_full_unstemmed	Patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in Chile, South America
title_sort	patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in chile, south america
publisher	Sociedad de Biología de Chile
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000100009
work_keys_str_mv	AT castrosergioa patternsofturnoverandfloristicsimilarityshowanonrandomdistributionofnaturalizedflorainchilesouthamerica AT jaksicfabianm patternsofturnoverandfloristicsimilarityshowanonrandomdistributionofnaturalizedflorainchilesouthamerica
_version_	1718439610499989504

Patterns of turnover and floristic similarity show a non-random distribution of naturalized flora in Chile, South America

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