Open Access. Powered by Scholars. Published by Universities.®
- Institution
- Publication
- Publication Type
Articles 1 - 3 of 3
Full-Text Articles in Life Sciences
Non-Photoperiodic Regulation Of Reproductive Physiology In The Flexibly Breeding Pine Siskin (Spinus Pinus), Heather E. Watts, Thomas P. Hahn
Non-Photoperiodic Regulation Of Reproductive Physiology In The Flexibly Breeding Pine Siskin (Spinus Pinus), Heather E. Watts, Thomas P. Hahn
Biology Faculty Works
In order to time reproduction to coincide with favorable conditions, animals use environmental cues to up- and down-regulate the reproductive axis appropriately. Although photoperiodic cues are one of the best studied of such environmental cues, animals also attend to others such as temperature, food availability, rainfall and social cues. Such non-photic cues are expected to be particularly important for tropical species and temperate-zone species that exhibit flexible or opportunistic breeding schedules. In this study, we investigate the use of non-photic cues, specifically food availability and social cues, to time the initiation of reproductive development in the pine siskin (Spinus …
Shorter Migration Distances Associated With Higher Winter Temperatures Suggest A Mechanism For Advancing Nesting Phenology Of American Kestrels Falco Sparverius, Julie A. Heath, Karen Steenhof, Mark A. Foster
Shorter Migration Distances Associated With Higher Winter Temperatures Suggest A Mechanism For Advancing Nesting Phenology Of American Kestrels Falco Sparverius, Julie A. Heath, Karen Steenhof, Mark A. Foster
Biology Faculty Publications and Presentations
Global climate change has affected avian migration patterns and nesting phenology. Changes in one phase of a bird's cycle will most likely affect other stages, but few studies focus simultaneously on multiple life-history events. We used western North American ringing records and Christmas Bird Counts to examine whether changes in migration patterns were concordant with advancing American kestrel Falco sparverius nesting phenology. Consistent with previous findings, male kestrels migrated shorter distances than female kestrels, and kestrels nesting in southern latitudes migrated shorter distances than kestrels nesting in more northern areas. In addition, kestrel migration distance decreased significantly from 1960 to …
Assessing The Link Between Coastal Development And The Quality Of Fish Habitat In Mangrove Tidal Tributaries, Justin Micheal Krebs
Assessing The Link Between Coastal Development And The Quality Of Fish Habitat In Mangrove Tidal Tributaries, Justin Micheal Krebs
USF Tampa Graduate Theses and Dissertations
To assess the potential influence of coastal development on the quality of estuarine habitat for nekton, we characterized land use and the intensity of land development surrounding small tidal tributaries of Tampa Bay. Based on this characterization, we classified tributaries as undeveloped, industrial, urban or man-made (i.e., mosquito-control ditches). Over one-third (37%) of tributaries were determined to be heavily developed, while fewer than one-third (28%) remain relatively undeveloped. We then examined the nekton community from eleven tributaries in watersheds representing the defined land-use classes. Whereas mean nekton density and species richness were both independent of land use, nekton-community structure differed …