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- Mate choice (4)
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Articles 31 - 32 of 32
Full-Text Articles in Life Sciences
Effects Of Exogenous Androgens On Parental Care Behaviour In Male Bluegill Sunfish (Lepomis Macrochirus), Chandra M.C. Rodgers
Effects Of Exogenous Androgens On Parental Care Behaviour In Male Bluegill Sunfish (Lepomis Macrochirus), Chandra M.C. Rodgers
Electronic Thesis and Dissertation Repository
Research suggests an androgen mediated trade-off between nurturing and defensive behaviour during parental care. This research, however, comes from species with biparental care, where changes in behaviour of one parent can be compensated for by the other parent. I tested the validity of this trade-off by manipulating androgen levels in bluegill sunfish (Lepomis macrochirus), a species where males provide sole parental care. I implanted males with testosterone, 11-ketotestosterone or flutamide, an androgen receptor blocker, and tested their nurturing behaviour and aggressiveness towards a brood predator. Males implanted with 11-ketotestosterone were 64% more aggressive and 71% less nurturing than …
Stopover Biology Of Migratory Landbirds In A Heavily Urbanized Landscape, The New York Metropolitan Area, Chad L. Seewagen
Stopover Biology Of Migratory Landbirds In A Heavily Urbanized Landscape, The New York Metropolitan Area, Chad L. Seewagen
Electronic Thesis and Dissertation Repository
Migration routes of many Nearctic-Neotropical landbirds pass through the most urbanized regions of North America. Migrants use urban habitat fragments as stopover sites and commonly occur in cities at exceptional density. Yet, knowledge of migrant stopover biology and refueling opportunities in such places is severely limited. This dissertation examined several aspects of migrant stopover biology in the New York metropolitan area to gain a more holistic understanding of how migratory landbirds utilize urban stopover sites, and ultimately to assess the quality of urban habitats as stopover sites. I first generated morphometric predictive models using salvaged bird specimens to allow me …