NDLI: Community diversity and invasion resistance: An experimental test in a grassland ecosystem and a review of comparable studies

Content Provider	Springer Nature Link
Author	Hector, Andy Dobson, Kim Minns, Asher Bazeley White, Ellen Hartley Lawton, John
Copyright Year	2001
Abstract	The relationship between community diversity and invasion resistance in a grassland was examined using experimental plant assemblages that varied in species richness and composition. The assemblages were weeded for three seasons to remove unsown species and we used the number of weeded seedlings, their total biomass and the number of species removed as indicators of community resistance and susceptibility to invasion. In general, we found a positive relationship between invasion resistance and increasing community diversity. Similar patterns of establishment were observed at the end of the fourth field season after several months without weeding. Increased invasion resistance with higher diversity appears to come through reduced levels of several above- and belowground resources, although these did not fully explain the effects of species richness in the study’s analyses. Experimental increases and reductions of litter biomass within the study’s experimental plant assemblages did not modify these patterns significantly. A review of comparable studies of invasion across directly manipulated diversity gradients revealed similar patterns. Positive effects of species diversity on invasion resistance were found in experimental manipulations of plant diversity conducted in the field and in the glasshouse, from studies with aquatic microcosms and in a marine system. Although some exceptions to this pattern were found in both terrestrial plant systems and aquatic microcosms, it was concluded that in biodiversity manipulation experiments more diverse communities are generally more resistant to invasion.
Starting Page	819
Ending Page	831
Page Count	13
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	16
Issue Number	5
e-ISSN	14401703
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-01
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	BIODEPTH project biodiversity community structure functional groups species richness Behavioural Sciences Ecology Evolutionary Biology Forestry Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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