Added: Deangelo Larue - Date: 22.12.2021 09:17 - Views: 23917 - Clicks: 6813
Most hypotheses attempting to explain the evolution of reversed sexual dimorphism RSD assume that size-related differences in foraging ability are of prime importance, but the studies on sex-specific differences in foraging behaviour remain scarce. We compare the foraging behaviour of males and females in a seabird species with a RSD by using several miniaturised activity and telemetry loggers. Both sexes spend similar time on the nest while incubating or brooding. When foraging at sea, males and females spend similar time foraging in oceanic waters, forage in similar areas, spend similar proportion of their foraging trip in flight, and feed on similar prey-flying fishes and flying squids-of similar size.
However, compared to males, females range farther during incubation 85 km vs. Males are much more active than females, landing and diving more often. During the study period, males lost mass, whereas females showed no ificant changes. These indicate that males and females of the red-footed boobies booby sex in several aspects in their foraging behaviour. Although some differences found in the study may be the direct result of the larger size of females, that is, the slightly higher speeds and deeper depths attained by females, others indicate clearly different foraging strategies between the sexes.
The smaller size and longer tail of males confer them a higher agility, and could allow them to occupy a foraging niche different from that of females. The higher foraging effort of males related to its different foraging strategy is probably at the origin of the rapid mass loss of males during the breeding period.
These suggest that foraging differences are probably the reason for the differential breeding investment observed in boobies, and are likely to be involved in the evolution and maintenance of RSD. Please enable it to take advantage of the complete set of features! Clipboard, Search History, and several other booby sex features are temporarily unavailable.
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Similar articles Relationship between reversed sexual dimorphism, breeding investment and foraging ecology in a pelagic seabird, the masked booby sex. Weimerskirch H, et al. Epub Jun PMID: The three-dimensional flight of red-footed boobies: adaptations to foraging in a tropical environment? Proc Biol Sci. Sex-specific foraging behaviour in a monomorphic seabird. Lewis S, et al. Ecological causes for the evolution of sexual dimorphism: a review of the evidence.
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References Physiol Behav. Publication types Comparative Study Actions.
Research Support, Non-U. Gov't Actions. MeSH terms Animals Actions. Body Size Actions. Female Actions. Male Actions. Oceans and Seas Actions. Time Factors Actions. Full text links [x] Springer. Copy Download.Booby sex
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