NDLI: Coexistence patterns of two invasive thistle species, Carduus nutans and C. acanthoides, at three spatial scales

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Coexistence patterns of two invasive thistle species, Carduus nutans and C. acanthoides, at three spatial scales

Content Provider	Springer Nature Link
Author	Rauschert, Emily S. J. Shea, Katriona Bjørnstad, Ottar N.
Copyright Year	2011
Abstract	To better understand the competitive processes involved in invasion by congeners, we examine coexistence patterns of two invasive species, Carduus nutans and C. acanthoides, at three spatial scales. A roadside survey of 5 × 5 km blocks in a previously identified overlap zone provided information about the regional scale. At smaller scales, we surveyed four fields of natural co-occurrence, quantifying the spatial patterns at the field scale by randomly placed 1 × 1 m quadrats and at the smallest scale by detailing plant position within the quadrats. The patterns observed are strikingly different at the different scales. At the regional scale, there is positive local autocorrelation in both species but negative cross-correlation between them, consistent with previous surveys. However, at the field scale, there is positive local autocorrelation in both species, and we generally see a positive association between the two species. At the plot scale, when excluding areas of joint absence, there is again a negative association between the two species. This pattern can also be seen at the field scale when excluding plots with joint absence. These results suggest that, at the scale of a field, the strongest factor determining location is aggregation in favorable habitats, which is a stronger force than the competition-induced segregation evidenced at small scales. Lottery competition for spatially aggregated safe sites thus appears to drive the patterns observed at the field scale, while the regional scale pattern may be a result of restricted natural dispersal and invasion history.
Starting Page	151
Ending Page	164
Page Count	14
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	14
Issue Number	1
e-ISSN	15731464
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-04-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carduus Coexistence Congeners Competition Scale dependence Spatial pattern Plant Sciences Ecology Developmental Biology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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Coexistence patterns of two invasive thistle species, Carduus nutans and C. acanthoides, at three spatial scales

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