Does reduced mobility through fragmented landscapes explain patch extinction patterns for three honeyeaters?

Harrisson, Katherine A., Pavlova, Alexandra, Amos, J. Nevil, Radford, James Q. and Sunnucks, Paul 2014, Does reduced mobility through fragmented landscapes explain patch extinction patterns for three honeyeaters?, Journal of animal ecology, vol. 83, no. 3, pp. 616-627, doi: 10.1111/1365-2656.12172.

Attached Files
Name Description MIMEType Size Downloads

Title Does reduced mobility through fragmented landscapes explain patch extinction patterns for three honeyeaters?
Author(s) Harrisson, Katherine A.
Pavlova, Alexandra
Amos, J. Nevil
Radford, James Q.
Sunnucks, Paul
Journal name Journal of animal ecology
Volume number 83
Issue number 3
Start page 616
End page 627
Total pages 12
Publisher Wiley-Blackwell Publishing
Place of publication London, England
Publication date 2014
ISSN 0021-8790
Keyword(s) Circuitscape
Population structure
Spatial autocorrelation
Woodland birds
Summary 1.Habitat loss and associated fragmentation are major drivers of biodiversity decline, and understanding how they affect population processes (e.g. dispersal) is an important conservation goal. In a large-scale test employing 10 × 10 km units of replication, three species of Australian birds, the fuscous honeyeater, yellow-tufted honeyeater and white-plumed honeyeater, responded differently to fragmentation. The fuscous and yellow-tufted honeyeaters are ‘decliners’ that disappeared from suitable habitat in landscapes where levels of tree-cover fell below critical thresholds of 17 and 8%, respectively. The white-plumed honeyeater is a ‘tolerant’ species whose likelihood of occurrence in suitable habitat was independent of landscape-level tree-cover. 2.To determine whether the absence of the two decliner species in low tree-cover landscapes can be explained by reduced genetic connectivity, we looked for signatures of reduced mobility and gene flow in response to fragmentation across agricultural landscapes in the Box-Ironbark region of north-central Victoria, Australia. 3.We compared patterns of genetic diversity and population structure at the regional scale and across twelve 100 km2 landscapes with different tree-cover extents. We used genetic data to test landscape models predicting reduced dispersal through the agricultural matrix. We tested for evidence of sex-biased dispersal and sex-specific responses to fragmentation. 4.Reduced connectivity may have contributed to the disappearance of the yellow-tufted honey-eater from low tree-cover landscapes, as evidenced by male bias and increased relatedness among males in low tree-cover landscapes and signals of reduced gene flow and mobility through the agricultural matrix. We found no evidence for negative effects of fragmentation on gene flow in the other decliner, the fuscous honeyeater, suggesting that undetected pressures act on this species. As expected, there was no evidence for decreased movement through fragmented landscapes for the tolerant white-plumed honeyeater. 5.We demonstrated effects of habitat loss and fragmentation (stronger patterns of genetic differentiation, increased relatedness among males) on the yellow-tufted honeyeater above the threshold at which probability of occurrence dropped. Increasing extent and structural connectivity of habitat should be an appropriate management action for this species and other relatively sedentary woodland specialist species for which it can be taken as representative.
Language eng
DOI 10.1111/1365-2656.12172
Field of Research 059999 Environmental Sciences not elsewhere classified
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2014, Wiley-Blackwell Publishing
Persistent URL

Document type: Journal Article
Collection: School of Life and Environmental Sciences
Connect to link resolver
Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved.

Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 7 times in TR Web of Science
Scopus Citation Count Cited 9 times in Scopus
Google Scholar Search Google Scholar
Access Statistics: 58 Abstract Views, 0 File Downloads  -  Detailed Statistics
Created: Tue, 18 Mar 2014, 08:43:42 EST

Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact