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Full-Text Articles in Life Sciences
A Model For Evaluating Time Constraints On Short-Term Reproductive Success In Altricial Birds1, Larry Clark
A Model For Evaluating Time Constraints On Short-Term Reproductive Success In Altricial Birds1, Larry Clark
Larry Clark
We develop a simple single dimension model incorporating the time and energy commitments of breeding altricial birds in an effort to understand the evolutionary constraints on parental care. We chose time as the dimension of preference, because it is a naturally bounded constraint, e.g., length of day or breeding season. The utility of the model was evaluated by comparing simulations of time allocation of various breeding scenarios for the European starling (Sturnus vulgaris) to field data. The structure of the model may prove useful in determining the evolutionary constraints on parental care imposed by the developmental pattern of chicks.
Consequences Of Homeothermic Capacity Of Nestlings On Parental Care In The European Starling, Larry Clark
Consequences Of Homeothermic Capacity Of Nestlings On Parental Care In The European Starling, Larry Clark
Larry Clark
The homeothermic capacity of chicks varied as a function of brood size, age, and air temperature. Commitment to rooding by parents also varied as a function of brood size, age of the young brooded, and prevailing air temperature. It was experimentally determined that parents altered their brooding commitment in direct response to the achieved mean homeothermic capacity of the brood rather than energy demands of the brood per se. Because larger broods achieved a given level of homeothermic capacity earlier than smaller broods, parents spent less time brooding larger broods. This "freed" time represented an increase in potential foraging time …
Nest Site Selection By The Red-Tailed Tropicbird, Larry Clark, Robert Ricklefs, Ralph Schrieber
Nest Site Selection By The Red-Tailed Tropicbird, Larry Clark, Robert Ricklefs, Ralph Schrieber
Larry Clark
-Red-tailed Tropicbirds (Phaethon rubricauda) nest under shrubs in loosely associated groups on Christmas Island, Central Pacific Ocean. Aggressive interactions among adults at nest sites are high; yet, large areas of superficially similar habitat contain no tropicbird nests at all. We compared physiognomic features of nest sites with those of two sets of randomly generated "nest sites" by discriminant function analysis. Of those variables measured, the number of stems within a nest space and the amount of peripheral cover influenced the tropicbirds' choice of nest sites. Differences among localities existed. Areas where tropicbirds nested had shrubs with few stems and more …
The Development Of Effective Homeothermy And Endothermy By Nestling Starlings, Larry Clark
The Development Of Effective Homeothermy And Endothermy By Nestling Starlings, Larry Clark
Larry Clark
No abstract provided.
The Development Of Effective Endothermy And Homeothermy By Nestling Piñon Jays, Larry Clark
The Development Of Effective Endothermy And Homeothermy By Nestling Piñon Jays, Larry Clark
Larry Clark
No abstract provided.
The Development Of Effective Endothermy And Homeothermy By Nestling Pition Jays, Larry Clark
The Development Of Effective Endothermy And Homeothermy By Nestling Pition Jays, Larry Clark
Larry Clark
No abstract provided.
Nest Desertion By The Pinyon Jay, Larry Clark