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Full-Text Articles in Life Sciences
Displaying To Females May Lower Male Foraging Time And Vigilance In A Lekking Bird, Sarah A. Cowles, Robert M. Gibson
Displaying To Females May Lower Male Foraging Time And Vigilance In A Lekking Bird, Sarah A. Cowles, Robert M. Gibson
School of Biological Sciences: Faculty Publications
Males of many species use courtship behavior to attract mates. However, by doing so males may face the associated costs of increased energetic expenditure, reduced foraging time, and elevated predation risk. We investigated the costs of display in lekking male Sharp-tailed Grouse (Tympanuchus phasianellus). We used lek-wide scan sampling to study how males allocated time among courtship display (‘‘dancing’’), agonism, foraging, and inactivity in relation to female numbers both within and across days. We also addressed the limited attention hypothesis and estimated visual attentiveness by videotaping 13 males and scoring head turns during these different activities. We found that the …
Isotopic Discrimination In The Double-Crested Cormorant (Phalacrocorax Auritus), Elizabeth C. Craig, Brian S. Dorr, Katie C. Hanson-Dorr, Jed P. Sparks, Paul D. Curtis
Isotopic Discrimination In The Double-Crested Cormorant (Phalacrocorax Auritus), Elizabeth C. Craig, Brian S. Dorr, Katie C. Hanson-Dorr, Jed P. Sparks, Paul D. Curtis
Brian S Dorr
The diet-tissue discrimination factor is the amount by which a consumer’s tissue varies isotopically from its diet, and is therefore a key element in models that use stable isotopes to estimate diet composition. In this study we measured discrimination factors in blood (whole blood, red blood cells and plasma), liver, muscle and feathers of Double- crested Cormorants (Phalacrocorax auritus) for stable isotope ratios of carbon, nitrogen and sulfur. Cormorants exhibited discrimination factors that differed significantly among tissue types (for carbon and nitrogen), and differed substantially (in the context of the isotopic variation among relevant prey species) from those observed in …
Shifts In Attack Behavior Of An Important Kelp Forest Predator Within Marine Reserves, J. S. Berriman, M. C. Kay, D. C. Reed, A. Rassweiler, D. A. Goldstein, William G. Wright
Shifts In Attack Behavior Of An Important Kelp Forest Predator Within Marine Reserves, J. S. Berriman, M. C. Kay, D. C. Reed, A. Rassweiler, D. A. Goldstein, William G. Wright
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Marine reserves have become increasingly valuable tools with which to manage ecosystems. These reserves consistently restore populations of top predators, often reducing availability of their favored prey. We hypothesized that such prey reduction in reserves causes protected predators to alter their attack behavior to include less palatable prey, potentially amplifying top-down effects on community structure. To test this hypothesis, we presented the relatively unpalatable sea hare Aplysia californica to freely foraging spiny lobsters Panulirus interruptus in 4 marine no-take reserves, each paired with an adjacent fished area. We found that lobsters only attacked sea hares inside reserves, where lobster density …
Effects Of Roads And Trails On Peaks Of Otter Salamander (Plethodon Hubrichti) And Eastern Red-Backed Salamander (Plethodon Cinereus) Movement Behavior, Cory Benjamin Goff
Effects Of Roads And Trails On Peaks Of Otter Salamander (Plethodon Hubrichti) And Eastern Red-Backed Salamander (Plethodon Cinereus) Movement Behavior, Cory Benjamin Goff
Theses, Dissertations and Capstones
Habitat fragmentation negatively affects movement and dispersal of wildlife by altering useable space and creating barriers. The objective of this study was to assess impacts of fragmentation by roads and trails on the movement behavior of two terrestrial, woodland salamander species. I evaluated whether proximity to roads and trails affected the movement behavior of two species: the Peaks of Otter Salamander (Plethodon hubrichti), a species of special concern, and the Eastern Red-backed Salamander (Plethodon cinereus). I examined movement behavior in three treatments: paved roads, gravel roads and hiking trails. I compared treatments to controls located at least 200m from treatment …
Context-Dependent Individual Variation In Foraging Behaviour And Parental Care In House Sparrows, David Moldoff
Context-Dependent Individual Variation In Foraging Behaviour And Parental Care In House Sparrows, David Moldoff
Theses and Dissertations--Biology
Behaviors can exhibit a wide degree of plasticity depending on the environmental context in which they are expressed. Despite this, repeatable differences have been found among and within individuals across a wide range of taxa. For my thesis, I investigated individual differences in foraging and parental care. In the first experiment, I assessed house sparrows (Passer domesticus) for domain-generality among neophobia, habituation and associative learning as they are all responses to novelty. While the results of the study find individual differences in each of these contexts the conclusion supported separate mechanisms for each response (domain-specificity). In the second experiment, I …