Escape from competition: neighbors reduce Centaurea stoebe performance at home but not away.

Abstract:

:The greater abundance of some exotic plants in their nonnative ranges might be explained in part by biogeographic differences in the strength of competition, but these competitive effects have not been experimentally examined in the field. We compared the effects of neighbors on the growth and reproduction of spotted knapweed (Centaurea stoebe) in Europe, where it is native, and in Montana, where it is invasive. There were strong negative competitive effects of neighboring vegetation on C. stoebe growth and reproduction in Europe. In contrast, identical experiments in Montana resulted in insignificant impacts on C. stoebe. Although the mechanisms that produce this dramatic biogeographic difference in competitive outcome remain unknown, our results indicate that differences in net competitive interactions between ranges may contribute to the striking dominance of C. stoebe in parts of North America.

journal_name

Ecology

journal_title

Ecology

authors

Callaway RM,Waller LP,Diaconu A,Pal R,Collins AR,Mueller-Schaerer H,Maron JL

doi

10.1890/11-0518.1

subject

Has Abstract

pub_date

2011-12-01 00:00:00

pages

2208-13

issue

12

eissn

0012-9658

issn

1939-9170

journal_volume

92

pub_type

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