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Full-Text Articles in Life Sciences
The Long Shadow Of Senescence: Age Impacts Survival And Territory Defense In Loons, Walter H. Piper, Kristin M. Brunk, Joel A. Flory, Michael W. Meyer
The Long Shadow Of Senescence: Age Impacts Survival And Territory Defense In Loons, Walter H. Piper, Kristin M. Brunk, Joel A. Flory, Michael W. Meyer
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Senescence, increased mortality that occurs among animals of advanced age, impacts behavior and ecology in many avian species. We investigated actuarial, reproductive, and behavioral senescence using capture, marking, and resighting data from a 26-year study of common loons (Gavia immer). Territorial residents of both sexes exhibited high annual survival (0.94) until their mid 20s, at which point survival fell to 0.76 and 0.77 in males and females, respectively. Sexual symmetry in actuarial senescence is somewhat surprising in this species, because males make a substantially greater investment in territory defense and chick-rearing and because males engage in lethal contests for territory …
Rapid Increase In Genetic Diversity In An Endemic Patagonian Tuco-Tuco Following A Recent Volcanic Eruption, Jeremy L. Hsu, Sharon Kam, Mauro N. Tammone, Eileen A. Lacey, Elizabeth A. Hadly
Rapid Increase In Genetic Diversity In An Endemic Patagonian Tuco-Tuco Following A Recent Volcanic Eruption, Jeremy L. Hsu, Sharon Kam, Mauro N. Tammone, Eileen A. Lacey, Elizabeth A. Hadly
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Catastrophic natural events can have profound impacts on patterns of genetic diversity. Due to the typically unpredictable nature of such phenomena, however, few studies have been able to directly compare patterns of diversity before and after natural catastrophic events. Here, we examine the impacts of a recent volcanic eruption in southern Chile on genetic variation in the colonial tuco-tuco (Ctenomys sociabilis), a subterranean species of rodent endemic to the area most affected by the June 2011 eruption of the Puyehue-Cordón Caulle volcanic complex. To provide a comparative context for interpreting changes in genetic variation in this species, we …
Skeletal Stiffening In An Amphibious Fish Out Of Water Is A Response To Increased Body Weight, Andy J. Turko, Dietmar KüLtz, Douglas S. Fudge, Roger P. Croll, Frank M. Smith, Matthew R. Stoyek, Patricia A. Wright
Skeletal Stiffening In An Amphibious Fish Out Of Water Is A Response To Increased Body Weight, Andy J. Turko, Dietmar KüLtz, Douglas S. Fudge, Roger P. Croll, Frank M. Smith, Matthew R. Stoyek, Patricia A. Wright
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Terrestrial animals must support their bodies against gravity, while aquatic animals are effectively weightless because of buoyant support from water. Given this evolutionary history of minimal gravitational loading of fishes in water, it has been hypothesized that weight-responsive musculoskeletal systems evolved during the tetrapod invasion of land and are thus absent in fishes. Amphibious fishes, however, experience increased effective weight when out of water – are these fishes responsive to gravitational loading? Contrary to the tetrapod-origin hypothesis, we found that terrestrial acclimation reversibly increased gill arch stiffness (∼60% increase) in the amphibious fish Kryptolebias marmoratus when loaded normally by gravity, …
Loon Project Database, Walter H. Piper
Loon Project Database, Walter H. Piper
Biology, Chemistry, and Environmental Sciences Faculty Data Sets
Data collected since 1993 in Oneida County, Wisconsin, on the breeding and territorial behavior of the common loon, Gavia immer. This study population is marked with USGS metal bands and colored leg bands for individual identification. It includes many individuals banded as chicks, whose life histories are known thoroughly. Data are collected from April through August of most years on this migratory species.