Copyright (c) 2009 All rights reserved. http://works.bepress.com/timothy_brophy Recent documents in Timothy R. Brophy en-us Wed, 08 Jul 2009 12:59:44 PDT 3600 http://works.bepress.com/timothy_brophy/23 http://works.bepress.com/timothy_brophy/23 Mon, 06 Jul 2009 12:50:59 PDT Reproduction and health were studied in a beaver (Castor canadensis) population from Prince William County, Virginia during 1998. Copulating beavers were observed in Quantico Creek at Prince William Forest Park on 22 January. Seven females from Quantico Marine Base were trapped between January and May, sacrificed, and dissected. Those reproductively active weighed over 39 pounds (17.7 kg) and were trapped before 1 March. Mean litter size based on counts of corpora lutea was 4.80 young (3-7); however, litter size based on the number of embryos present was only 2.75 (1-3), comparable to most others reported in the literature. Five of the seven dissected females had prime pelts, one an average pelt, and one a poor quality pelt. Subcutaneous fat deposits and those at the base of the tail were moderate to high in all females. Four contained moderate mesenteric deposits, while three had low to no mesenteric fat present. No abnormalities were found in the heart, lungs, liver, kidneys, or bladder. Four females had suffered wounds to either the tail and/or body, possibly from male courtship. The females harbored two of the most common beaver helminths: the stomach nematode, Travassosizts america1711S (100% incidence) and the cecal trematode, Stichorchis subtriquetnis (86% incidence). Compared to other reported studies, these worm burdens were moderate to average. Timothy R. Brophy http://works.bepress.com/timothy_brophy/22 http://works.bepress.com/timothy_brophy/22 Mon, 06 Jul 2009 12:50:40 PDT We describe reproduction in West Virginia populations of the southern two-lined salamander (Eurycea cirrigera) and provide insights into the behavioral ecology of this wide-ranging urodele. The first signs of reproduction are evident well before the arrival of Spring. Sexually mature adults inhabit the cold, rocky streams of southwestern West Virginia in early February. Females arc known by the presence of large oocytes visible through the body wall and males by their extremely swollen heads. Breeding occurs in the stream during late March and is marked by the presence of gravid females with sperm caps in their posterior cloacae. Eggs are deposited from mid-March through early April on the underside of flat rocks in cool, shallow, and swiftly flowing streams. Females guard their nests against potential predators, including other two-lined salamanders. Hatchlings emerge as miniature adults with gills after several months of development. Timothy R. Brophy http://works.bepress.com/timothy_brophy/21 http://works.bepress.com/timothy_brophy/21 Thu, 18 Jun 2009 07:19:03 PDT Michelle McConnachie Presentations http://works.bepress.com/timothy_brophy/20 http://works.bepress.com/timothy_brophy/20 Thu, 18 Jun 2009 07:19:02 PDT Allometric growth and sexual dimorphism of the shell is evident in Malayemys macrocephala from the Chao Phraya River Basin of central Thailand. Differences in allometric growth between males and females produce sexually dimorphic adults. Adult females exhibit larger sizes and have relatively wider and higher shells and longer plastra than males. Timothy R. Brophy Articles http://works.bepress.com/timothy_brophy/19 http://works.bepress.com/timothy_brophy/19 Thu, 18 Jun 2009 07:19:01 PDT Timothy R. Brophy Presentations http://works.bepress.com/timothy_brophy/18 http://works.bepress.com/timothy_brophy/18 Thu, 18 Jun 2009 07:19:01 PDT Timothy R. Brophy Articles http://works.bepress.com/timothy_brophy/17 http://works.bepress.com/timothy_brophy/17 Thu, 18 Jun 2009 07:19:00 PDT Timothy R. Brophy Presentations http://works.bepress.com/timothy_brophy/16 http://works.bepress.com/timothy_brophy/16 Thu, 18 Jun 2009 07:18:59 PDT Geographic variation was studied in the south-east Asian turtles of the genus Malayemys (Testudines: Bataguridae). Discriminant function analysis of head-stripe and shell characters reveals a clear pattern of geographic variation that is consistent with the topography of south-east Asia and the poor dispersal abilities of these turtles. Two phenotypically and morphologically distinct groups of Malayemys occur allopatrically in lowland areas of mainland south-east Asia, and my data concludes that each should be recognized as a distinct species. Turtles from the Mekong River Basin retain the name Malayemys subtrijuga (Schlegel and Müller, 1844), whereas those from the Chao Phraya and Mae Klong river basins, coastal areas of south-eastern Thailand, and the Malay Peninsula are assigned the name Malayemys macrocephala (Gray, 1859). Malayemys macrocephala has four or fewer nasal stripes (99%) and an infraorbital stripe that is relatively wide at the loreal seam (98% of InfSW/HW=0.07-0.18) and does not extend or extends only slightly superior to the loreal seam (96%). Conversely, M. subtrijuga has six or more nasal stripes (89%) and an infraorbital stripe that is relatively narrow at the loreal seam (92% of InfSW/HW=0.02-0.06), extends completely superior to the loreal seam (96%), and usually joins the supraorbital stripe (64%). Female M. macrocephala also have relatively longer AnL and relatively shorter Vert5L and PecL than M. subtrijuga. Similarly, male M. macrocephala have relatively longer PPLL and AbdL, relatively shorter Pleu1L and PecL, and greater RLatK values than M. subtrijuga. Both species are potentially threatened by overcollection and habitat destruction, and should be protected as separate taxa of concern. In addition, discriminant function analysis of shell and head-stripe characters suggests that M. subtrijuga on Java are derived by human intervention primarily from the Mekong River Basin. Timothy R. Brophy Presentations http://works.bepress.com/timothy_brophy/15 http://works.bepress.com/timothy_brophy/15 Thu, 18 Jun 2009 07:18:58 PDT Michelle McConnachie Presentations http://works.bepress.com/timothy_brophy/14 http://works.bepress.com/timothy_brophy/14 Thu, 18 Jun 2009 07:18:58 PDT Timothy R. Brophy Articles