The use of specialisation indices to predict vulnerability of coral-feeding butterflyfishes to environmental change Lawton, Rebecca J. Pratchett, Morgan S. Berumen, Michael L. 2012-02-27T20:46:27Z 2014-10-22T08:57:25Z 2011-07
dc.description Author Posting. © The Author(s), 2011. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Oikos 121 (2012): 191-200, doi:10.1111/j.1600-0706.2011.19409.x. en_US
dc.description.abstract In the absence of detailed assessments of extinction risk, ecological specialisation is often used as a proxy of vulnerability to environmental disturbances and extinction risk. Numerous indices can be used to estimate specialisation; however, the utility of these different indices to predict vulnerability to future environmental change is unknown. Here we compare the performance of specialisation indices using coral-feeding butterflyfishes as a model group. Our aims were to (i) quantify the dietary preferences of 3 butterflyfish species across habitats with differing levels of resource availability; (ii) investigate how estimates of dietary specialisation vary with the use of different specialisation indices; (iii) determine which specialisation indices best inform predictions of vulnerability to environmental change; and (iv) assess the utility of resource selection functions to inform predictions of vulnerability to environmental change. The relative level of dietary specialisation estimated for all three species varied when different specialisation indices were used, indicating that the choice of index can have a considerable impact upon estimates of specialisation. Specialisation indices that do not consider resource abundance may fail to distinguish species that primarily use common resources from species that actively target resources disproportionately more than they are available. Resource selection functions provided the greatest insights into the potential response of species to changes in resource availability. Examination of resource selection functions, in addition to specialisation indices, indicated that Chaetodon trifascialis was the most specialised feeder, with highly conserved dietary preferences across all sites, suggesting that this species is highly vulnerable to the impacts of climate-induced coral loss on reefs. Our results indicate that vulnerability assessments based on some specialisation indices may be misleading and the best estimates of dietary specialisation will be provided by indices which incorporate resource availability measures, as well as assessing responses of species to changes in resource availability. en_US
dc.description.embargo 2012-07-14
dc.description.sponsorship This research was funded in part by a Queensland Government Smart State PhD Scholarship and a Wildlife Preservation Society of Australia grant to RJL and a Sir Keith Murdoch Fellowship from the American Australian Association to MLB. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.subject Chaetodontidae en_US
dc.subject Dietary specialisation en_US
dc.subject Ecological versatility en_US
dc.subject Extinction risk en_US
dc.subject Resource selectivity en_US
dc.title The use of specialisation indices to predict vulnerability of coral-feeding butterflyfishes to environmental change en_US
dc.type Preprint en_US
dspace.entity.type Publication
relation.isAuthorOfPublication 32869999-7860-4814-a2ac-6d606692cd9c
relation.isAuthorOfPublication ad2057f3-3497-4a5a-bef9-02a21e5b2ed2
relation.isAuthorOfPublication 272f75c6-4a2a-407b-84f0-49272a2a31f9
relation.isAuthorOfPublication.latestForDiscovery 32869999-7860-4814-a2ac-6d606692cd9c
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Lawton et al 2011 Oikos revised.pdf
449.76 KB
Adobe Portable Document Format
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
1.89 KB
Item-specific license agreed upon to submission