Find a copy online
Links to this journal/publication
Find a copy in the library
Finding libraries that hold this item...
|All Authors / Contributors:||Helmut C Mueller|
No less than 20 hypotheses have been proposed to explain reversed sexual dimorphism (RSD) in raptorial birds. I have generated a prediction from each of these hypotheses and tested the prediction using the available information and nonparametric statistics. RSD correlates significantly only with female dominance in intraspecies interactions and with prey type. Unfortunately, the data on dominance interactions are limited, but the best working hypothesis appears to be that RSD has evolved primarily as a result of epigamic selection, with female dominance facilitating pair formation and maintenance. Prey specialization appears merely to influence the degree of, and does not cause, RSD. Most species of owls are specialists on either invertebrates or small mammals. Specialists on invertebrates show little RSD and specialists on small mammals show moderate to high RSD.