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Risks and Rewards of Nest Defence by Parent Birds
A comprehensive functional theory of nest defence based on life-history theory can help to elucidate many of the patterns observed in this important aspect of the parental care behavior of a wide variety of animals.
Meta‐analysis of transmitter effects on avian behaviour and ecology
This work has shown that attaching transmitters and other devices to free‐living birds without a clear understanding of potential deleterious consequences to their study organisms, and thus to their data, is a major cause of concern.
Realized Reproductive Success of Polygynous Red-Winged Blackbirds Revealed by DNA Markers
Genetically based measures of reproductive success show that individual males realize more than 20% of their overall success from extra-pair fertilizations, on average, and that this form of mating behavior confounds traditional measures of male success.
Genetic structure of populations of the threatened eastern massasauga rattlesnake, Sistrurus c. catenatus: evidence from microsatellite DNA markers
- H. Gibbs, K. Prior, P. Weatherhead, G. Johnson
- Environmental Science, BiologyMolecular Ecology
- 1 December 1997
Six microsatellite DNA loci are used to generate information on the degree of genetic differentiation between, and the levels of inbreeding within, populations of the threatened eastern massasauga rattlesnake to understand how evolutionary processes operate in these populations and aid the development of conservation plans for this species.
Pair and extra-pair mating success relative to male quality in red-winged blackbirds
It is proposed that the direct advantage realized by older males in extra-pair matings might indicate that experience is important, such that experienced males are better at creating or exploiting the opportunities for extra- Pair mating.
Offspring Quality and the Polygyny Threshold: "The Sexy Son Hypothesis"
An expansion of the Orians-Verner model for the evolution of polygyny has been made to explain evidence contradictory to that model. By separating the individual quality of the male from the quality…
Microgeographic population genetic structure in the northern water snake, Nerodia sipedon sipedon detected using microsatellite DNA loci
Eight microsatellite DNA loci from the northern water snake are described and used to analyse levels of genetic differentiation between local (<2km apart) populations of these snakes in Ontario, demonstrating that microgeographic genetic structure exists in this species.
American robin nestlings compete by jockeying for position
It is concluded that jockeying for position by Nestling American robins can influence the pattern of food allocation by parents, and that hungry nestlings can improve their competitive standing against nestmates by moving to positions where parents are more likely to feed them.
Extra–pair mating, male plumage coloration and sexual selection in yellow warblers (Dendroica petechia)
This study confirms that extra–pair mating can be an important mechanism of sexual selection even when the most successful sires are commonly cuckolded, and refutes a previous hypothesis that the variation in plumage and behaviour among male yellow warblers is an example of alternative, equally successful, evolutionarily stable strategies.
TARGETS OF SEXUAL SELECTION: SONG AND PLUMAGE OF WOOD WARBLERS
Overall, males of more dimorphic species sang shorter songs more often, but did not have more complex songs, while when monomorphic species were excluded from the analysis, it was found that the total time spent singing and repertoire size increased with plumage dimorphism.