Abstract:
:Climate change leads to species range shifts and consequently to changes in diversity. For many systems, increases in diversity capacity have been forecast, with spare capacity to be taken up by a pool of weedy species moved around by humans. Few tests of this hypothesis have been undertaken, and in many temperate systems, climate change impacts may be confounded by simultaneous increases in human-related disturbance, which also promote weedy species. Areas to which weedy species are being introduced, but with little human disturbance, are therefore ideal for testing the idea. We make predictions about how such diversity capacity increases play out across elevational gradients in non-water-limited systems. Then, using modern and historical data on the elevational range of indigenous and naturalized alien vascular plant species from the relatively undisturbed sub-Antarctic Marion Island, we show that alien species have contributed significantly to filling available diversity capacity and that increases in energy availability rather than disturbance are the probable underlying cause.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Chown SL,le Roux PC,Ramaswiela T,Kalwij JM,Shaw JD,McGeoch MAdoi
10.1098/rsbl.2012.0806subject
Has Abstractpub_date
2013-02-23 00:00:00pages
20120806issue
1eissn
1744-9561issn
1744-957Xpii
rsbl.2012.0806journal_volume
9pub_type
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