Jeffery Larkin

We compared habitat features of Golden-winged Warbler (Vermivora chrysoptera) territories in the presence and absence of the Blue-winged Warbler (V. cyanoptera) on reclaimed coal mines in southeastern Kentucky, USA. Our objective was to determine whether there are ...

... Geology of Kentucky. Waverly Publishing, Baltimore, MD. 531. pp. MECH, LD 1983. Handbook of Animal Radio-tracking. University of Minnesota Press, Minneapolis, MN. 107. pp. MOHR, CO 1947. Table of equivalent populations of North American small mammals. ...

We compared habitat features of Golden-winged Warbler (Vermivora chrysoptera) territories in the presence and absence of the Blue-winged Warbler (V. cyanoptera) on reclaimed coal mines in southeastern Kentucky, USA. Our objective was to determine whether there are ...

... Jeffery L. Larkin 1,2,3 ,; John J. Cox 1,2 ,; Michael W. Wichrowski 2 ,; Matthew R. Dzialak 1,2 ,; David S. Maehr 2. ... distribute elk widely across the restoration zone, but the resulting density of individuals may be insufficient to promote population growth and stability (Gogan & Barrett ...

A recent model of Florida panther (Puma concolor coryi) habitat erred in arbitrarily creating buffers around radio locations collected during daylight hours on the assumption that study animals were only at rest during these times. The buffers generated by this method likely cause an overestimation of the amounts and kinds of habitats that are used by the panther. This, and other errors, could lead to the impression that unfragmented forest cover is unimportant to panther conservation, and could encourage inaccurate characterizations of panther habitat. Previous 24-hour monitoring of activity and activity readings made during routine telemetry flights indicate that high levels of activity occur in the early morning hours. Literature on the behavior of the species does not support the creation of large buffers around telemetry locations to compensate for the lack of nighttime telemetry data. A thorough examination of ongoing studies that use global positioning systems may help calibr...

On 20 April 2003, we found an active Eastern Phoebe (Sayornis phoebe) nest located under a capstone rock ledge on a reclaimed mine in Breathitt County, Kentucky. The capstone was one of several clustered together on top of a southwestern slope at 420 m in ...

... Yet species found in grassy openings in the adjacent forests such as Synaptomys cooperi Baird (Southern Bog Lemming), Blarina brevicauda ... Chestnut) on uncompacted mine spoil in eastern Kentucky failed due to seed predation by small mammals (C. Barton, University of ...

ABSTRACT Disruptions in metapopulation connectivity due to demographic pressure can leave genetically isolated subpopulations susceptible to genetic drift, accumulation of deleterious alleles, and inbreeding depression. Such a scenario may be playing out within Allegheny woodrat (Neotoma magister) metapopulations as a series of synergistic extrinsic pressures have contributed to the rangewide decline of the species over the last 40 years. Our goal was to elucidate the effects of demographic collapse on metapopulation function by using 11 microsatellites markers to quantify differences in patterns of connectivity and genetic diversity between a demographically stable metapopulation and one in severe demographic decline. The demographically diminished metapopulation had lower levels of genetic diversity than the stable metapopulation at all levels evaluated (metapopulation-, subpopulation-, and individual-scales). In contrast to patterns of connectivity observed within the stable metapopulation, peripheral subpopulations in the diminished metapopulation had become completely isolated and were drifting toward genetic fixation, likely as a result of the extirpation of stepping-stone subpopulations. The declining genetic parameters observed within these isolated peripheral subpopulations suggest that inbreeding depression may be contributing significantly to their demographic decline. Allegheny woodrats readily express the genetic consequences of metapopulation decline due to the low effective population sizes of subpopulations and the species’ limited dispersal capacity. Differences in genetic parameters observed between demographically stable and diminished Allegheny woodrat metapopulations emphasize the risks posed to metapopulation function and associated genetic processes introduced with demographic decline.

... Cox, JJ, Maehr, DS and Larkin, JL (2002), The Biogeography of Faunal Place Names in the United States. ... tajacu), lynx (Lynx lynx), moose (Alces alces), mountain goat (Oreamnos americanus), otter (Lutra canadensis), pronghorn (Antilocapra americana), wolf (Canis lupus and ...

... Journal of American Veterinary Medical Association 207:1562–1575. PubMed, CSA. Krebs, JW, TW Strine, JS Smith, DL Noah, CE Rupprecht, and JE Childs. 1996. ... CrossRef, PubMed.Larkin, JL, EH Ellington, JC Wester, M. Lovallo, and M. Dzialak. 2009. ...

... Michael W. Wichrowski 1 , 2 , * , David S. Maehr 1 , Jeffery L. Larkin 1 , John J. Cox 1 , and Mattias PO Olsson 3. ... In western Montana and Colorado, similar disruptions occurred where elk inhabited areas with limited forest cover (Edge 1982, Schultz and Bailey 1978). ...

... Yet species found in grassy openings in the adjacent forests such as Synaptomys cooperi Baird (Southern Bog Lemming), Blarina brevicauda ... Chestnut) on uncompacted mine spoil in eastern Kentucky failed due to seed predation by small mammals (C. Barton, University of ...

ABSTRACT Timber harvest is an important extractive, economic activity to many human economies, but it can be detrimental to ecosystem function and species viability therein by degrading and fragmenting forest habitat. Salamanders comprise a significant amount of forest community biomass, and given their sensitivity to environmental stressors, including those caused by timber harvest, they often serve as important indicators of declines in forest ecosystem function. Several studies have focused on the impacts of timber harvest on salamanders inhabiting perennial and intermittent streams, the findings of which have helped inform best management practices for timber harvest in the U.S. Ephemeral headwater streams and associated riparia account for a small fraction of the total landscape, yet these features are critical to the functioning of forested ecosystems; however, few studies have examined how timber harvest impacts salamanders in or near these areas. Our objective was to investigate the effects of three different silvicultural treatments, each involving different streamside management zone (SMZ) characteristics, on salamander communities in southeastern Kentucky hardwood forest ephemeral streams. Data were collected by regular checks of pitfall traps, coverboards, and transect searches. Using both pre- and post-harvest data, abundance estimates were acquired using binomial mixture models. Declines in some species of terrestrial and stream-breeding salamanders were detected, and were shown to be likely related to characteristics of the corresponding silvicultural treatment. We suggest that application of modest SMZ regulations to ephemeral streams would likely reduce or alleviate salamander declines in these important headwater areas.

... of female Golden-winged Warblers by male Blue-winged Warblers, which can be quite persistent (Confer and Larkin 1998, R ... Financial support came from the following: Ithaca College Provost's Research Grant, two grants from the Max McGraw Foundation, National Science ...