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Fine-scale effects of habitat loss and fragmentation despite large-scale gene flow for some regionally declining woodland bird species Harrisson, Katherine A., Pavlova, Alexandra, Amos, J. Nevil, Takeuchi, Naoko, Lill, Alan, Radford, James Q. and Sunnucks, Paul 2012, Fine-scale effects of habitat loss and fragmentation despite large-scale gene flow for some regionally declining woodland bird species, Landscape ecology, vol. 27, no. 6, pp. 813-827. Attached Files Name Description MIMEType Size Downloads Title Fine-scale effects of habitat loss and fragmentation despite large-scale gene flow for some regionally declining woodland bird species Author(s) Harrisson, Katherine A. Pavlova, Alexandra Amos, J. Nevil Takeuchi, Naoko Lill, Alan Radford, James Q. Sunnucks, Paul Journal name Landscape ecology Volume number 27 Issue number 6 Start page 813 End page 827 Total pages 15 Publisher Springer Place of publication Amsterdam, The Netherlands Publication date 2012 ISSN 0921-2973 1572-9761 Keyword(s) dispersal demographic connectivity landscape connectivity genetic structure Summary Habitat loss and associated fragmentation effects are well-recognised threats to biodiversity. Loss of functional connectivity (mobility, gene flow and demographic continuity) could result in population decline in altered habitat, because smaller, isolated populations are more vulnerable to extinction. We tested whether substantial habitat reduction plus fragmentation is associated with reduced gene flow in three 'decliner' woodland-dependent bird species (eastern yellow robin, weebill and spotted pardalote) identified in earlier work to have declined disproportionately in heavily fragmented landscapes in the Box-Ironbark forest region in north-central Victoria, Australia. For these three decliners, and one 'tolerant' species (striated pardalote), we compared patterns of genetic diversity, relatedness, effective population size, sex-ratios and genic (allele frequency) differentiation among landscapes of different total tree cover, identified population subdivision at the regional scale, and explored fine-scale genotypic (individual-based genetic signature) structure. Unexpectedly high genetic connectivity across the study region was detected for 'decliner' and 'tolerant' species. Power analysis simulations suggest that moderate reductions in gene flow should have been detectable. However, there was evidence of local negative effects of reduced habitat extent and structural connectivity: slightly lower effective population sizes, lower genetic diversity, higher within-site relatedness and altered sex-ratios (for weebill and eastern yellow robin) in 10 x 10 km 'landscapes' with low vegetation cover. We conclude that reduced structural connectivity in the Box-Ironbark ecosystem may still allow sufficient gene flow to avoid the harmful effects of inbreeding in our study species. Although there may still be negative consequences of fragmentation for demographic connectivity, the high genetic connectivity of mobile bird species in this system suggests that reconnecting isolated habitat patches may be less important than increasing habitat extent and/or quality if these need to be traded off. Language eng Field of Research 050104 Landscape Ecology Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences HERDC Research category C1 Refereed article in a scholarly journal Copyright notice ©2012, Springer Science+Business Media B.V. Persistent URL http://hdl.handle.net/10536/DRO/DU:30047074 Document type: Journal Article Collection: School of Life and Environmental Sciences Related Links Link Description Connect to published version (restricted access) Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Mon, 13 Aug 2012, 13:12:43 EST Wed, 12 Sep 2012, 12:07:28 EST Wed, 12 Sep 2012, 12:09:09 EST Wed, 12 Sep 2012, 12:09:48 EST Thu, 13 Dec 2012, 13:14:53 EST Thu, 13 Dec 2012, 13:17:02 EST Thu, 24 Jan 2013, 14:43:23 EST Thu, 24 Jan 2013, 15:38:07 EST Thu, 24 Jan 2013, 15:40:16 EST Mon, 17 Jun 2013, 17:49:20 EST Filtered Full Citation counts:   Cited 5 times in TR Web of Science Cited 5 times in Scopus Search Google Scholar Access Statistics: 59 Abstract Views, 4 File Downloads  -  Detailed Statistics Created: Mon, 13 Aug 2012, 13:12:43 EST

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