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Articles 1 - 4 of 4
Full-Text Articles in Life Sciences
Sex Determination By Morphological Measurements Of Young Rockhopper Penguins (Eudyptes Chrysocome) During The Crèche Phase, Virginia Morandini, Miguel Ferrer, Lynelle Perry, Marc Bechard
Sex Determination By Morphological Measurements Of Young Rockhopper Penguins (Eudyptes Chrysocome) During The Crèche Phase, Virginia Morandini, Miguel Ferrer, Lynelle Perry, Marc Bechard
Raptor Research Center Publications and Presentations
To provide an easy and reliable work tool to identify the sex of Rockhopper Penguin (Eudyptes chrysocome) chicks, we weighed and measured 95 nestlings in the crèche phase during 24-31 January 2017 on the Falkland Islands, Argentina. Sex was subsequently determined using DNA analyses of blood from the same individuals. Significant differences were found in bill length (exposed culmen), bill depth and width, flipper length, and diagonal tarsus, but stepwise discriminant analysis showed bill length to be the best predictor for sex determination. Our model correctly classified 82.7% of males and 90.2% of females (overall correct classification 86.2%). …
Morphological Changes In American Kestrels (Falco Sparverius) At Continental Migration Sites, Gregory S. Kaltenecker
Morphological Changes In American Kestrels (Falco Sparverius) At Continental Migration Sites, Gregory S. Kaltenecker
Intermountain Bird Observatory Publications and Presentations
Many American kestrel (Falco sparverius) populations are declining across North America. Potential causes include mortality from reduction in food availability, a changing climate, habitat degradation, an increase in avian predators, disease, and toxins. We analyzed American kestrel count and banding data from seven raptor migration sites throughout North America with at least 20 years of migration data. We used count data to determine the year at which the kestrel population began a significant decline and then used banding records to determine whether body mass and wing chord declined after this point. We found reductions in kestrel body mass …
Helping Farmers And Reducing Car Crashes: The Surprising Benefits Of Predators, Christopher O'Bryan, Eve Mcdonald-Madden, James Watson, Neil Carter
Helping Farmers And Reducing Car Crashes: The Surprising Benefits Of Predators, Christopher O'Bryan, Eve Mcdonald-Madden, James Watson, Neil Carter
Human-Environment Systems Research Center Faculty Publications and Presentations
Humans may be Earth’s apex predator, but the fleeting shadow of a vulture or the glimpse of a big cat can cause instinctive fear and disdain. But new evidence suggests that predators and scavengers are much more beneficial to humans than commonly believed, and that their loss may have greater consequences than we have imagined.
Climate Change, Cattle, And The Challenge Of Sustainability In A Telecoupled System In Africa, Tara S. Easter, Alexander K. Killion, Neil H. Carter
Climate Change, Cattle, And The Challenge Of Sustainability In A Telecoupled System In Africa, Tara S. Easter, Alexander K. Killion, Neil H. Carter
Ecology, Evolution, and Behavior
Information, energy, and materials are flowing over greater distances than in the past, changing the structure and feedbacks within and across coupled human and natural systems worldwide. The telecoupling framework was recently developed to understand the feedbacks and multidirectional flows characterizing social and environmental interactions between distant systems. We extend the application of the telecoupling framework to illustrate how flows in beef affect and are affected by social-ecological processes occurring between distant systems in Africa, and how those dynamics will likely change over the next few decades because of climate-induced shifts in a major bovine disease, trypanosomosis. The disease is …