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Density dependence maintains long-term stability despite increased isolation and inbreeding in the Florida Scrub-Jay.
Ecol Lett
December 2024
Department of Biology, University of Rochester, Rochester, New York, USA.
Isolation caused by anthropogenic habitat fragmentation can destabilize populations. Populations relying on the inflow of immigrants can face reduced fitness due to inbreeding depression as fewer new individuals arrive. Empirical studies of the demographic consequences of isolation are critical to understand how populations persist through changing conditions.
View Article and Find Full Text PDFHabitat remediation followed by managed connectivity reduces unwanted changes in evolutionary trajectory of high extirpation risk populations.
PLoS One
May 2024
College of Forestry, Wildlife, and Environment, Auburn University, Auburn, Alabama, United States of America.
As we continue to convert green spaces into roadways and buildings, connectivity between populations and biodiversity will continue to decline. In threatened and endangered species, this trend is particularly concerning because the cessation of immigration can cause increased inbreeding and loss of genetic diversity, leading to lower adaptability and higher extirpation probabilities in these populations. Unfortunately, monitoring changes in genetic diversity from management actions such as assisted migration and predicting the extent of introduced genetic variation that is needed to prevent extirpation is difficult and costly in situ.
View Article and Find Full Text PDFPopulation genetics and phylogeographic history of the insular lizard (Gunther, 1874) from the Balearic Islands based on genome-wide polymorphic data.
Ecol Evol
May 2024
Department of Evolutionary Biology, Ecology and Environmental Sciences, Biology Faculty University of Barcelona (UB) Barcelona Spain.
Article Synopsis
- The study investigates the genetic diversity of the Balearic lizard, an endemic species in small island populations, using newly available genomic data and combining it with previous research for a comprehensive analysis.
- Findings reveal that each island has well-differentiated populations with high genetic diversity and low inbreeding, despite smaller island sizes impacting genetic variation.
- The research identifies the origin of the species in Mallorca over Menorca and highlights significant genetic differentiation between the two major island groups, setting the stage for future studies on adaptation and phenotypic divergence.
The origin, connectivity, and individual specialization of island wolves after deer extirpation.
Ecol Evol
April 2024
Department of Fisheries, Wildlife, and Conservation Sciences Oregon State University Corvallis Oregon USA.
Wolves are assumed to be ungulate obligates, however, a recently described pack on Pleasant Island, Alaska USA, is persisting on sea otters and other marine resources without ungulate prey, violating this long-held assumption. We address questions about these wolves regarding their origin and fate, degree of isolation, risk of inbreeding depression, and diet specialization by individual and sex. We applied DNA metabarcoding and genotyping by amplicon sequencing using 957 scats collected from 2016 to 2022, and reduced representation sequencing of tissue samples to establish a detailed understanding of Pleasant Island wolf ecology and compare them with adjacent mainland wolves.
View Article and Find Full Text PDFAugmenting depleted genetic diversity can improve the fitness and evolutionary potential of wildlife populations, but developing effective management approaches requires genetically monitored test cases. One such case is the small, isolated and inbred Cotter River population of an endangered Australian freshwater fish, the Macquarie perch , which over 3 years (2017-2019) received 71 translocated migrants from a closely related, genetically more diverse population. We used genetic monitoring to test whether immigrants bred, interbred with local fish and augmented population genetic diversity.
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