Behavioral Ecology of Tropical Birds by Bridget J.M. Stutchbury, Visit Amazon's Eugene S. Morton

By Bridget J.M. Stutchbury, Visit Amazon's Eugene S. Morton Page, search results, Learn about Author Central, Eugene S. Morton,

  • ''This unique and priceless publication might help to increase the knowledge of avian ecology in the course of the world.''
    ?-D. Flaspohler, Michigan Technical college, in selection (January 2002)


    ''This is a stimulating booklet and a wealthy resource of analysis rules written at a degree appropriate for undergraduates...''
    ?-Jeremy Lindsell in IBIS (2001)


    ''...an articulate uncomplicated evaluation of what presently is shaping the sector of avian behavioral ecology within the tropics. ...The authors are to be recommended for bringing jointly a knowledge base that i am hoping will motivate ornithologists so as to add to its destiny expansion.''
    ?John Kricher for THE WILSON BULLETIN (September 2001)


    ''The relevant power of this booklet is the authors' breadth of expertise, which gives credibility to their claims. ...I suggest Behavioral Ecology of Tropical Birds to budding behavioral ecologists who're at the prowl for learn issues which can regulate the instructions of the sector, and to ecologists within the temperate quarter who ask yourself why their colleagues visit the hassle and fee of mounting behavioral examine tasks within the tropics.''
    ?-Tom A. Langen, Clarkson college, in ECOLOGY (November 2001)


    ''...an articulate simple evaluation of what presently is shaping the sphere of avia behavioral ecology within the tropics. ...The authos are to be recommended for bringing jointly a knowledge base that i am hoping will motivate ornithologists so as to add to its destiny expansion.''
    ?John Kricher for THE WILSON BULLETIN (September 2001)

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When sex roles are highly divergent, selection pressures are divergent and one often sees sexually selected traits and behaviors in males but not females. Sex role divergence is typical of temperate zone passerines, where males sing and defend territories, compete for EPFs, and their parental care is generally limited to nest defense and feeding young. Females, of course, do not usually sing or defend territories as aggressively as males do and they build nests and incubate the eggs alone. Extra-pair behavior creates strongly divergent sex roles as males compete for EPFs, females are discerning in their acceptance of extra-pair mates, and males and females have an unequal genetic stake in the brood they raise together.

Any general hypothesis for clutch size in the tropics must account for these patterns. Skutch (1949) suggested that nest predation, not food limitation, was the main cost of having large broods. He observed that nest predation is remarkably high in the tropics, and suggested that large broods would suffer high predation owing to the increased parental activity at the nest. This hypothesis assumes that predators find nests primarily via parental activity. Young (1996) found that the feeding rate to House Wren nests increased with enlarged broods but the risk of nest predation did not.

2 Sex roles, male parental care, and sexual selection Mating systems are intricately tied to sex roles in parental care and territory defense. Sex roles and sexual selection are tied in a feedback loop, reinforcing each other (Andersson 1994). When sex roles are highly divergent, selection pressures are divergent and one often sees sexually selected traits and behaviors in males but not females. Sex role divergence is typical of temperate zone passerines, where males sing and defend territories, compete for EPFs, and their parental care is generally limited to nest defense and feeding young.

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