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Person

Nimish B Vyas

Research Biologist
Eastern Ecological Science Center

Email: nvyas@usgs.gov
Office Phone: 301-497-5721
Fax: 301-497-5744
ORCID: 0000-0003-0191-1319

Location
PTX - Gabrielson Office
12100 Beech Forest Road
Laurel , MD 20708
US

Supervisor: Alicia Berlin
Range-wide population status of the Appalachian Grizzled Skipper and the factors that may influence its population persistence
The FWS considers the Appalachian grizzled skipper (AGS, Pyrgus wyandot) a Species of Concern and is requesting key information on this species for a status review. According to the RFP, FWS has given AGS full species status, however, AGS’s taxonomic status is considered controversial. Some lepidopterists recognize P. wyandot as a full species whereas others consider it a subspecies, P. centaureae wyandot (pers. comm. B. Leppo, PA Natural Heritage Program; in Chazal et al., 2004). Regardless, FWS can still list AGS as threatened or endangered at the species or subspecies level. In this proposal, AGS will be treated as P. c. wyandot for simplicity during genetic analysis (Objective 4). The AGS is a small butterfly...
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Dataset includes: Bird body weight, Number of seeds dosed per day per bird,amount of pesticide dosed, pesticide residues on seeds, weight of treated seed dosed per day, weight of fecal sample for each sample, residue analyses of fecal samples, the weather conditions during the two weathering periods
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An important component of assessing the hazards of anticoagulant rodenticides to non-target wildlife are observations in exposed free-ranging individuals. The objective of this study was to determine if environmentally realistic, sublethal first-generation anticoagulant rodenticide exposures via prey, can result in direct or indirect adverse effects to free-flying raptors. We offered black-tailed prairie dogs (Cynomys ludovicianus) that had fed on Rozol® Prairie Dog Bait (0.005% active ingredient chlorophacinone) to six wild-caught red-tailed hawks (RTHA, Buteo jamaicensis), and uncontaminated black-tailed prairie dogs to two wild-caught RTHAs for 7 days. On day 6, blood was collected from all eight RTHAs to determine...
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