Correlates of vascular plant species richness in fragmented indigenous forests: assessing the role of local and regional factors | Land Portal

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Date of publication: 
décembre 2004
Resource Language: 
ISBN / Resource ID: 
AGRIS:US201600190920
Pages: 
45-54

Both local and regional factors determine local species richness. We investigated the relative role of local (13 soil and tree stand structure variables) and regional factors (19 climate, land cover and geographic location variables) in determining the richness of several vascular plant functional groups in indigenous forest fragments in southeastern New Zealand. The predictor variables explaining the largest fraction of the variation in species richness were identified using a backward and forward stepwise procedure, with adjustments for the number of variables and testing for multicollinearity. The total proportion of variation explained by local and regional factors was highest for tree species richness (54.1%) and lowest for herbaceous species richness (28.2%). We found differences between the functional groups in the extent to which species richness was explained by local vs. regional factors, but both showed some ability to explain the species richness of all functional groups. The abundance of the strongly competitive tree species Nothofagus menziesii (silver beech) had a strong negative effect on total, tree and herb species richness, but it had only minor effects on woody and fern species richness. Once the effect of this local variable was accounted for, the remaining variation in tree and woody species richness was mainly explained by regional variables. Herbaceous and fern species richness, on the other hand, was strongly correlated with local as well as regional variables. We emphasize the importance of using a fixed plot size when the relative effects of local and regional factors on patterns of species richness are to be compared and evaluated.

Auteurs et éditeurs

Author(s), editor(s), contributor(s): 

Ohlemüller, R.
P. Bannister
K.J.M. Dickinson
S. Walker
B.J. Anderson
J.B. Wilson

Publisher(s): 
Akadémiai Kiadó logo

Akadémiai Kiadó, founded in 1828 by the Hungarian Academy of Sciences, is Hungary’s oldest continuously operating publishing house. Our mission is to promote Hungarian and international science, that is, to publish the new discoveries in various areas of science, to effectively support information exchange amongst scientists on a global level, and to make scientific results a public property available for all who seek valuable and reliable knowledge.

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