John M. Epifanio

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Genomic introgression among divergent taxa following human-mediated secondary contact is a growing concern for the management and conservation of aquatic biodiversity. We simulated the composition of taxa following admixture and hybridization by independently altering three variables: (1) initial proportion of parental taxa following secondary contact; (2)(More)
Genetic considerations permeate the intricateinteractions of marine aquacultural populationswith their wild counterparts. We illustratethese complexities in a matrix where sevencategories of primary aquaculture activity(conservation, supplementation, mitigation,intentional introduction, put-and-take,commercial captive rearing, experimental) arelinked to(More)
Bighead carp (Hypophthalmichthys nobilis) and silver carp (H. molitrix) are invasive species and listed as US federally injurious species under the Lacy Act. They have established populations in much of the Mississippi River Basin (MRB; Mississippi, Illinois, and Missouri rivers) and are capable of producing fertile hybrids and complex introgression.(More)
Alewife Alosa pseudoharengus, a small clupeid fish native to Atlantic Ocean, has recently (∼150 years ago) invaded the North American Great Lakes and despite challenges of freshwater environment its populations exploded and disrupted local food web structures. This range expansion has been accompanied by dramatic changes at all levels of organization.(More)
John Epifanio1 & Jennifer Nielsen2∗ 1Past-President, Genetics Section of the American Fisheries Society, The Center for Aquatic Ecology Illinois Natural History Survey, 607 East Peabody Drive, Champaign, IL 61820, USA (E-mail:; 2President, Genetics Section of the American Fisheries Society, USGS-BRD, Alaska Science Center, Anchorage,(More)
Hybridization among conspecifics in native and introduced habitats has important implications for biological invasions in new ecosystems. Bighead (Hypophthalmichthys nobilis) and silver carp (H. molitrix) are genetically isolated and occur in sympatry within their native range. Following their introduction to North America, however, introgressant hybrids(More)
A 4 year mark-recapture study examined the pattern of nesting site fidelity of parental-type male bluegill Lepomis macrochirus. The study results indicated that iteroparous male L. macrochirus choose new nest sites near their own previously used sites. The scale of site fidelity varied, but generally males choose to renest within shoreline areas rather than(More)
Bilby is an ecologist at Weyerhaeuser Company, Tacoma, Washington. Bisson is senior scientist at the Forestry Sciences Laboratory of the U.S. Forest Service, Olympia, Washington. Coutant is distinguished research ecologist, Oak Ridge National Laboratory, Oak Ridge, Tennessee. Epifanio is director and associate professional scientist for the Division of(More)
The evolutionary sequence of events in the evolution of reproductive barriers between species is at the core of speciation biology. Where premating barriers fail, post-mating barriers, such as conspecific sperm precedence (CSP), gamete incompatibility (GI) and hybrid inviability (HI) may evolve to prevent the production of (often) costly hybrid offspring(More)
Predicting the success of a species' colonization into a novel environment is routinely considered to be predicated on niche-space similarity and vacancy, as well as propagule pressure. The role genomic variation plays in colonization success (and the interaction with environment) may be suggested, but has not rigorously been documented. To test an(More)