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- Archiolochus alexandri; Archilohus colubris; citizen science; eBird; hummingbird; looped migration; North America; seasonal migration; Selasphorus calliope; Selasphorus platycercus; Selasphorus rufus; temporal variation. (1)
- Copulatory plug (1)
- Ejaculates (1)
- Energetic costs of reproduction (1)
- Size dependence (1)
Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Heat Dissipation During Hovering And Forward Flight In Hummingbirds, Don Powers, Bret W. Tobalske, J. Keaton Wilson, Keeley R. Corder
Heat Dissipation During Hovering And Forward Flight In Hummingbirds, Don Powers, Bret W. Tobalske, J. Keaton Wilson, Keeley R. Corder
Faculty Publications - Department of Biological & Molecular Science
Flying animals generate large amounts of heat, which must be dissipated to avoid overheating. In birds, heat dissipation is complicated by feathers, which cover most body surfaces and retard heat loss. To understand how birds manage heat budgets during flight, it is critical to know how heat moves from the skin to the external environment. Hummingbirds are instructive because they fly at speeds from 0 to more than 12ms−1, during which they transit from radiative to convective heat loss. We used infrared thermography and particle image velocimetry to test the effects of flight speed on heat loss from specific body …
Algae Population Self-Replenishment, R. Corban Harwood
Algae Population Self-Replenishment, R. Corban Harwood
Faculty Publications - Department of Mathematics
This modeling scenario investigates the massive algal blooms that struck Lake Chapala, Mexico, in 1994. After reading a summary of news articles on the incident, students create an ODE system model from a verbal description of the factors, visualize this system using an executable Java applet (PPLANE) to predict overall behavior, and then analyze the nonlinear system using the Jacobian matrix, eigenvalues, phase plane, and feasibility conditions on parameters to fully describe the system behavior. Students are expected to be familiar with systems of differential equations, equilibria, jacobian matrices, and eigenvalues. Students will learn modeling from qualitative descriptions, nondimensionalization, applying …
Citizen-Science Data Provides New Insight Into Annual And Seasonal Variation In Migration Patterns, S R. Supp, Frank A. La Sorte, Tina A. Cormier, Marisa C. W. Lim, Donald R. Powers, Susan M. Wethington, Scott Goetz, Catherine H. Graham
Citizen-Science Data Provides New Insight Into Annual And Seasonal Variation In Migration Patterns, S R. Supp, Frank A. La Sorte, Tina A. Cormier, Marisa C. W. Lim, Donald R. Powers, Susan M. Wethington, Scott Goetz, Catherine H. Graham
Faculty Publications - Department of Biological & Molecular Science
Current rates of global environmental and climate change pose potential challenges for migratory species that must cope with or adapt to new conditions and different rates of change across broad spatial scales throughout their annual life cycle. North American migratory hummingbirds may be especially sensitive to changes in environment and climate due to their extremely small body size, high metabolic rates, and dependence on nectar as a main resource. We used occurrence information from the eBird citizen-science database to track migratory movements of five North American hummingbird species (Archilochus alexandri, A. colubris, Selasphorus calliope, S. platycercus, and S. rufus) across …
Size Dependence In Non-Sperm Ejaculate Production Is Reflected In Daily Energy Expenditure And Resting Metabolic Rate, Christopher R. Friesen, Donald R. Powers, Paige E. Copenhaver-Parry, Robert T. Mason
Size Dependence In Non-Sperm Ejaculate Production Is Reflected In Daily Energy Expenditure And Resting Metabolic Rate, Christopher R. Friesen, Donald R. Powers, Paige E. Copenhaver-Parry, Robert T. Mason
Faculty Publications - Department of Biological & Molecular Science
The non-sperm components of an ejaculate, such as copulatory plugs, can be essential to male reproductive success. But the costs of these ejaculate components are often considered trivial. In polyandrous species, males are predicted to increase energy allocation to the production of non-sperm components, but this allocation is often condition dependent and the energetic costs of their production have never been quantified. Red-sided garter snakes (Thamnophis sirtalis parietalis) are an excellent model with which to quantify the energetic costs of non-sperm components of the ejaculate as they exhibit a dissociated reproductive pattern in which sperm production is temporally disjunct from …
A Simple Bioluminescent Method For Measuring D-Amino Acid Oxidase Activity, T. Spencer Bailey, Micah T. Donor, Sean P. Naughton, Michael D. Pluth
A Simple Bioluminescent Method For Measuring D-Amino Acid Oxidase Activity, T. Spencer Bailey, Micah T. Donor, Sean P. Naughton, Michael D. Pluth
Faculty Publications - Department of Biological & Molecular Science
D-Amino acid oxidase (DAO) plays important roles in regulating D-amino acid neurotransmitters and was recently identified as a key enzyme integral to hydrogen sulfide production from D-Cys. We report here the development of a simple biocompatible, bioluminescent method for measuring DAO activity based on the highly selective condensation of D-Cys with 6-hydroxy-2-cyanobenzothiazole (CBT-OH) to form D-luciferin.