NDLI: Changes in the cover of plant species associated with climate change and grazing pressure on the Macquarie Island coastal slopes, 1980

Content Provider	Springer Nature Link
Author	Scott, J. J. Kirkpatrick, J. B.
Copyright Year	2012
Abstract	Climate change and alien species have affected the vegetation of subantarctic islands. Long-term monitoring of vegetation change on the steep coastal slopes of subantarctic Macquarie Island has allowed responses of plant species to various disturbance regimes to be well documented, although, until recently, the confounding effect of feral herbivore disturbance obscured any responses that might be attributed to climate change. The uncoupling of climate change from variation in feral rabbit numbers allowed us to test whether any plant species were increasing or decreasing on the coastal slopes of the island between 1980 and 2009, independent of rabbit grazing pressure. We used analysis of variance to test for differences in species cover classes between four measurement times on each of 101 quadrats in each of 1980/1981, 1995, 2003 and 2009. We had 54 quadrats on landslips and 47 elsewhere. Approximately two-thirds of the species with significant temporal change exhibited changes that could be expected from variation in rabbit grazing pressure. However, approximately one-third of the species increased in cover irrespective of grazing pressure. On landslips, variation in the cover of these increaser species was largely related to time in a linear mixed model, whereas elsewhere altitude and time were both important. The increase in both atmospheric dryness and episodic soil water-logging that has been described for the island since 1980 may best explain the increaser species.
Starting Page	127
Ending Page	136
Page Count	10
File Format	PDF
ISSN	07224060
Journal	Polar Biology
Volume Number	36
Issue Number	1
e-ISSN	14322056
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-09-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Subantarctic Vegetation disturbance Long-term monitoring Rabbit grazing Climate change Ecology Oceanography Microbiology Plant Sciences Zoology
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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