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
Ecologyjournal_title
Ecologyauthors
Callaway RM,Waller LP,Diaconu A,Pal R,Collins AR,Mueller-Schaerer H,Maron JLdoi
10.1890/11-0518.1subject
Has Abstractpub_date
2011-12-01 00:00:00pages
2208-13issue
12eissn
0012-9658issn
1939-9170journal_volume
92pub_type
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