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Prickly pairs: the proportion of spinescent species does not differ between islands and mainlands
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作者 floret l.meredith Marianne L.Tindall +1 位作者 Frank A.Hemmings Angela T.Moles 《Journal of Plant Ecology》 SCIE CSCD 2019年第6期941-948,共8页
Aims Organisms on islands are thought to escape biotic pressure and lose defensive capabilities.However,broadscale,evidence-based tests of this idea are rare.In this study,we asked:(i)whether the proportion of spinesc... Aims Organisms on islands are thought to escape biotic pressure and lose defensive capabilities.However,broadscale,evidence-based tests of this idea are rare.In this study,we asked:(i)whether the proportion of spinescent plant species differed between islands and mainlands and(ii)whether the proportion of spinescent species increased with increasing island area and with decreasing island distance to mainland.Methods We compiled species lists for 18 island–mainland pairs around Australia.We classified 1129 plant species as spinescent or nonspinescent using published species descriptions.Important Findings There was no significant difference between the proportion of spinescent species found on islands and on mainlands.Proportions of spinescent species were not significantly related to island area or distance to mainland.Our results suggest that spinescence is just as important to island plants as it is to mainland plants,even for plants inhabiting small or distal islands.This is unexpected,given prevailing thought and previous work on island–mainland comparisons.Our study demonstrates the importance of testing well-accepted yet untested ideas. 展开更多
关键词 HERBIVORY island biogeography theory physical defence plant community plant defence prickles THORNS
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