Many animal species live and breed in colonies. Although biologists have documented numerous costs and benefits of group living, such as increased competition for limited resources and more pairs of eyes to watch for predators, they often still do not agree on why coloniality evolved in the first place.
Drawing on their twelve-year study of a population of cliff swallows in Nebraska, the Browns investigate twenty-six social and ecological costs and benefits of coloniality, many never before addressed in a systematic way for any species. They explore how these costs and benefits are reflected in reproductive success and survivorship, and speculate on the evolution of cliff swallow coloniality.
This work, the most comprehensive and detailed study of vertebrate coloniality to date, will be of interest to all who study social animals, including behavioral ecologists, population biologists, ornithologists, and parasitologists. Its focus on the evolution of coloniality will also appeal to evolutionary biologists and to psychologists studying decision making in animals.
The Effect of an Unconstitutional Statute was first published in 1935. Minnesota Archive Editions uses digital technology to make long-unavailable books once again accessible, and are published unaltered from the original University of Minnesota Press editions.
The Effect of Praise and Competition on the Persisting Behavior of Kindergarten Children was first published in 1939. Minnesota Archive Editions uses digital technology to make long-unavailable books once again accessible, and are published unaltered from the original University of Minnesota Press editions.No. 15, Institute of Child Welfare Monograph SeriesIn this study of five-year-olds, an experimenting psychologist has gone beyond previous investigators and attempted to show what factors in the presentation of a task and also in a child’s permanent social field seem to be related to persisting behavior and motivation.Important for psychologists, school principals and teachers, and all who would understand the effect of incentives, is her finding that the nature of the task and – in at least some instances – the order of its presentation in a series have a marked effect on persisting performance.