Genetic structure and sex-biased dispersal of a declining cooperative-breeder, the Grey-crowned Babbler,<i>Pomatostomus temporalis</i>, at the southern edge of its range

Stevens, Kate; Harrisson, Katherine A.; Clarke, Rohan H.; Cooke, Raylene; Hogan, Fiona

doi:10.1071/mu15096

Cited by 5 publications

(16 citation statements)

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“…Stevens et al. (), however, reported strong genetic structure across our study area. To increase the statistical power and inference reliability of BayesAss output, we followed Meirmans () further suggestions and ran over 30 repeats and did not average results, instead reporting the most biological meaningful and repeated results.…”

Section: Methodscontrasting

confidence: 64%

“…Extraction protocol, primer sequences, PCR conditions and protocols, and appropriate genetic marker behavior checks are described in Stevens et al. ().…”

Section: Methodsmentioning

confidence: 99%

“…However, the potential influence of including close relatives should be greater on analyses conducted at the site level (<0.5 km; Stevens et al. ) than at the subpopulation or regional level (which pools multiple sites). Previously we found that removing closely related individuals did not substantially alter inferences (e.g., patterns of diversity, genetic structure, relatedness; Stevens et al.…”

Section: Methodsmentioning

confidence: 99%

“…Previously we found that removing closely related individuals did not substantially alter inferences (e.g., patterns of diversity, genetic structure, relatedness; Stevens et al. ), so we chose to retain all individuals to retain maximum power.…”

Section: Methodsmentioning

confidence: 99%

“…, Stevens et al. ). Cooperatively breeding birds typically have much smaller effective breeding populations than pair breeding species when compared to total population size (Frankham ).…”

Section: Introductionmentioning

confidence: 99%

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Reduced gene flow in a vulnerable species reflects two centuries of habitat loss and fragmentation

et al. 2018

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. 2018. Reduced gene flow in a vulnerable species reflects two centuries of habitat loss and fragmentation. Ecosphere 9(2):e02114. 10. 1002/ecs2.2114 Abstract. Understanding the effects of landscape modification on gene flow of fauna is central to informing conservation strategies that promote functional landscape connectivity and population persistence. We explored the effects of large-scale habitat loss and fragmentation on spatial and temporal patterns of gene flow in a threatened Australian woodland bird: the Grey-crowned Babbler Pomatostomus temporalis. Using microsatellite data, we (1) investigated historical (i.e., pre-fragmentation) and contemporary (i.e., postfragmentation) levels of gene flow among subpopulations and/or regions, (2) identified first-generation migrants and likely dispersal events, (3) tested for signatures of genetic bottlenecks, (4) estimated contemporary and historical effective population sizes, and (5) explored the relative influences of drift and migration in shaping contemporary population structure. Results indicated that the functional connectivity of landscapes used by the Grey-crowned Babbler is severely compromised in the study area. The proportion of individuals that were recent immigrants among all subpopulations were low. Habitat fragmentation has led to a clear division between subpopulations in the east and west, and the patterns of gene flow exchange between these two regions have changed over time. The effective population size estimates for these two regions are now well below that required for long-term population viability (N e < 100). Demographic history models indicate that genetic drift was a greater influence on subpopulations than gene flow, and most subpopulations show signatures of bottlenecks. Translocations to promote gene flow and boost genetic diversity in the short term and targeted habitat restoration to improve landscape functional connectivity in the long term represent promising conservation management strategies that will likely have benefits for many other woodland bird species.

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Section: Methodscontrasting

confidence: 64%

“…Extraction protocol, primer sequences, PCR conditions and protocols, and appropriate genetic marker behavior checks are described in Stevens et al. ().…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…, Stevens et al. ). Cooperatively breeding birds typically have much smaller effective breeding populations than pair breeding species when compared to total population size (Frankham ).…”

Section: Introductionmentioning

confidence: 99%

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