Distinguishing reintroduction from recolonization with genetic testing. (October 2017)

• Record Type: Journal Article
• Authors: Stewart, Frances E.C.; Volpe, John P.; Taylor, John S.; Bowman, Jeff; Thomas, Philippe J.; Pybus, Margo J.; Fisher, Jason T.
• Is Part Of: Biological conservation. Volume 214(2017)
• Page Start: 242
• Page End: 249
• Publication Date: 2017-10
• Subjects: CLM Cooking Lake Moraine -- WW Willmore Wilderness -- NA Northern Alberta -- MB Manitoba -- ON Ontario; Reintroduction biology -- Conservation genetics -- Wildlife management -- Species recovery -- Fisher -- Pekania pennanti; Conservation of natural resources -- Periodicals; Nature conservation -- Periodicals; Ecology -- Periodicals; Environment -- Periodicals; Environmental Pollution -- Periodicals; Electronic journals; 333.9516
• DOI: 10.1016/j.biocon.2017.08.004
• Languages: English
• ISSNs: 0006-3207

Abstract

Abstract: Reintroductions are a common tool for restoring lost biodiversity around the globe and across taxa. The decision to pursue a reintroduction is often based upon the success of past efforts, yet in most cases the assumption that resulting populations are the products of recolonization, is not tested. By collecting data from source populations, reintroduced populations, and natural populations adjacent to reintroductions, it is possible to evaluate the success of past reintroduction events and these data may be used to guide future conservation initiatives. We used the fisher ( Pekania pennanti ), one of North America's most commonly reintroduced species, as a model to conduct an evaluation of reintroduction success. We genotyped 147 individuals at 15 microsatellite loci to determine the genetic contribution of reintroduced individuals to an ostensibly successfully reintroduced population in central Alberta, Canada. Principle component analysis and Bayesian statistical methods converged with confidence on one result: assayed individuals were descended from adjacent native Albertan populations, not putative founders from eastern Canada. A review of fisher reintroduction literature reveals similar patterns: a large proportion of contemporary individuals appear to be the result of recolonization events. Our study has broad implications for conservation as it may imply a 1) over-confidence in past reintroductions, which might lead to significant expenditure of financial and human capital on future initiatives of modest, if any, benefit, and 2) underestimation of some species' ability to disperse and (re-)colonize, highlighting limits to our understanding of functional connectivity. Obtaining appropriate genetic samples in relation to reintroductions will help determine when future reintroduction is likely to be the best conservation initiative. Highlights: Genetic samples distinguishing reintroduction from recolonization are rarely used in conservation biology. The fisher ( Pekania pennanti ) provides a fantastic model species to evaluate these two management techniques. A large proportion of contemporary individuals appear to be the result of recolonization events rather than successful reintroductions. Conservation must consider alternative management approaches through better understanding of functional connectivity.