6 results on '"Gabrielle J. Graeter"'
Search Results
2. Hatch Success and Recruitment Patterns of the Bog Turtle
- Author
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Kyle Barrett, Michael D. Knoerr, and Gabrielle J. Graeter
- Subjects
geography ,geography.geographical_feature_category ,Ecology ,biology ,biology.organism_classification ,Glyptemys muhlenbergii ,law.invention ,Mesopredator release hypothesis ,law ,General Earth and Planetary Sciences ,Turtle (robot) ,Bog ,Ecology, Evolution, Behavior and Systematics ,Nature and Landscape Conservation ,General Environmental Science - Published
- 2020
3. Bog Turtle Demographics within the Southern Population
- Author
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Gabrielle J. Graeter, Annalee M. Tutterow, and Shannon E. Pittman
- Subjects
0106 biological sciences ,geography ,education.field_of_study ,geography.geographical_feature_category ,biology ,Ecology ,Population ,Endangered species ,Aquatic Science ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,Glyptemys muhlenbergii ,law.invention ,010601 ecology ,Habitat ,law ,Threatened species ,Juvenile ,Animal Science and Zoology ,Turtle (robot) ,education ,Bog ,Ecology, Evolution, Behavior and Systematics - Abstract
Turtles are among the most vulnerable vertebrate group to declines, extirpations, and extinctions, especially those species with specific habitat requirements. The Bog Turtle (Glyptemys muhlenbergii) is listed as federally Threatened in the United States, but the southern population of the species does not receive full habitat protection under the Endangered Species Act. To understand Bog Turtle demographics within the southern population, we applied Cormack-Jolly-Seber and multistate models in program MARK and calculated annual adult, sex-specific, and juvenile survival for intensively sampled (19–180 sampling days) Bog Turtle populations in North Carolina. The most parsimonious model indicated that adult survival remained constant over time for all populations, but was relatively low when compared to other species of turtles. Adult survival estimates varied between 0.86 and 0.94 among the sites, all below the 0.96 adult survival estimate documented for northern Bog Turtle populations. To evaluate variat...
- Published
- 2017
4. New Distribution Records for Bats in Northwestern North Carolina
- Author
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Mary K. Clark, Corinne A. Diggins, Gabrielle J. Graeter, and Kendrick Weeks
- Subjects
Conservation planning ,geography ,geography.geographical_feature_category ,biology ,business.industry ,Coastal plain ,Distribution (economics) ,biology.organism_classification ,Fishery ,Habitat ,Lasiurus seminolus ,Environmental protection ,business ,Ecology, Evolution, Behavior and Systematics - Abstract
Bats in the eastern US face many significant threats, and more information on the distribution, natural history, and condition of multiple bat species is needed for conservation planning and management. To address this need for the northwestern mountain region of North Carolina, we conducted a large-scale, 3-day bat blitz in 2011 at 30 mist-net sites across 6 counties. We documented the presence of 8 species and obtained new county and summer records for 7 of those 8. Most notably, in McDowell County we documented Lasiurus seminolus (Seminole Bat), a species associated with Coastal Plain habitats and for which there were no previous records in the northwestern mountain region of North Carolina. “Bio-blitz” inventories have many benefits beyond scientific results, including opportunities to share research ideas, foster new collaborations, train students in techniques, and provide educational programs.
- Published
- 2015
5. Effects of Timber Harvest on Amphibian Populations: Understanding Mechanisms from Forest Experiments
- Author
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Tracy A. G. Rittenhouse, Brian D. Todd, Elizabeth B. Harper, Sean M. Blomquist, James P. Gibbs, Raymond D. Semlitsch, Betsie B. Rothermel, Malcolm L. Hunter, Daniel J. Hocking, Gabrielle J. Graeter, J. Whitfield Gibbons, Aram J. K. Calhoun, and David A. Patrick
- Subjects
Canopy ,Clearcutting ,Amphibian ,Habitat ,Agroforestry ,Ecology ,biology.animal ,Forest management ,Logging ,Juvenile ,Biology ,Vital rates ,General Agricultural and Biological Sciences - Abstract
Harvesting timber is a common form of land use that has the potential to cause declines in amphibian populations. It is essential to understand the behavior and fate of individuals and the resulting consequences for vital rates (birth, death, immigration, emigration) under different forest management conditions. We report on experimental studies conducted in three regions of the United States to identify mechanisms of responses by pond-breeding amphibians to timber harvest treatments. Our studies demonstrate that life stages related to oviposition and larval performance in the aquatic stage are sometimes affected positively by clearcutting, whereas effects on juvenile and adult terrestrial stages are mostly negative. Partial harvest treatments produced both positive and weaker negative responses than clearcut treatments. Mitigating the detrimental effects of canopy removal, higher surface temperature, and loss of soil-litter moisture in terrestrial habitats surrounding breeding ponds is critical to maintaining viable amphibian populations in managed forested landscapes.
- Published
- 2009
6. Habitat Selection and Movement of Pond-Breeding Amphibians in Experimentally Fragmented Pine Forests
- Author
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Betsie B. Rothermel, Gabrielle J. Graeter, and J. Whitfield Gibbons
- Subjects
Amphibian ,education.field_of_study ,Ecology ,Population ,Forest management ,Leopard ,Biology ,biology.organism_classification ,Habitat ,biology.animal ,Southern toad ,General Earth and Planetary Sciences ,education ,Bufo ,Marbled salamander ,Ecology, Evolution, Behavior and Systematics ,Nature and Landscape Conservation ,General Environmental Science - Abstract
Population-level responses of amphibians to forest management regimes are partly dictated by individual behavioral responses to habitat alteration. We examined the short-term (i.e., 24-hr) habitat choices and movement patterns of 3 amphibian species—southern leopard frogs (Rana sphenocephala), marbled salamanders (Ambystoma opacum), and southern toads (Bufo terrestris)—released on edges between forest habitats and recent clear-cuts in the Upper Coastal Plain of South Carolina, USA. We predicted that adult frogs and salamanders would preferentially select forest using environmental cues as indicators of habitat suitability. We also predicted that movement patterns would differ in clear-cuts relative to forests, resulting in lower habitat permeability of clear-cuts for some or all of the species. Using fluorescent powder tracking, we determined that marbled salamanders selected habitat at random, southern toads preferred clear-cuts, and southern leopard frogs initially selected clear-cuts but ultimately preferred forests. Frogs exhibited long-distance, directional movement with few turns. In contrast, toads exhibited wandering behavior and salamanders moved relatively short distances before locating cover. Southern toads and southern leopard frogs moved farther in forests, and all 3 species made more turns in clear-cuts than in forests. Habitat selection by southern toads did not vary according to body size, sex, or the environmental cues we measured. However, marbled salamanders were more likely to enter clear-cuts when soil moisture was high, and southern leopard frogs were more likely to enter clear-cuts when relative humidity and air temperature were higher in the clear-cut than in adjacent forest. Although we found evidence of reduced habitat permeability of clear-cuts for southern leopard frogs and southern toads, none of the species exhibited strong behavioral avoidance of the small (4-ha) clear-cuts in our study. Further studies of long-term habitat use and the potential physiological and other costs to individuals in altered forests are needed to understand the effects of forest management on population persistence. To reduce potentially detrimental effects of clear-cutting on amphibians in the Southeast, wildlife managers should consider the vagility and behavior of species of concern, especially in relation to the size of planned harvests adjacent to breeding sites.
- Published
- 2008
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