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''This unique and worthy booklet might help to develop the certainty of avian ecology through the world.''
?-D. Flaspohler, Michigan Technical collage, in selection (January 2002)
''This is a stimulating e-book and a wealthy resource of analysis principles written at a degree appropriate for undergraduates...''
?-Jeremy Lindsell in IBIS (2001)
''...an articulate simple evaluate of what at present is shaping the sector of avian behavioral ecology within the tropics. ...The authors are to be recommended for bringing jointly a data base that i am hoping will encourage 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 supplies credibility to their claims. ...I suggest Behavioral Ecology of Tropical Birds to budding behavioral ecologists who're at the prowl for learn themes that can adjust the instructions of the sphere, and to ecologists within the temperate quarter who ask yourself why their colleagues visit the trouble and rate of mounting behavioral study initiatives within the tropics.''
?-Tom A. Langen, Clarkson college, in ECOLOGY (November 2001)
''...an articulate easy assessment of what presently is shaping the sector of avia behavioral ecology within the tropics. ...The authos are to be recommended for bringing jointly a data 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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Additional resources for Behavioral Ecology of Tropical Birds
2000) as a result of selection from similar ecological and social pressures. Climate in south temperate regions, like southern South America and Australia, is not nearly as seasonal as it is in north temperate regions because land masses are concentrated at latitudes closer to the equator. Consequently, breeding seasons are long and most passerines are year-round residents (Rowley and Russell 1991). These similarities with the tropics mean that hypotheses for the evolution of life history traits in the tropics can also be tested in south temperate regions, if these hypotheses truly offer general explanations.
Reproductive effort is evolutionarily LIFE HISTORY TRAITS 35 linked to adult survival through the cost of reproduction. Cost of reproduction is the reduced future survival or reproductive output which results from current reproductive effort. High reproductive effort causes a high cost of reproduction through the physiological toll of breeding, and can also include increased risk of adult predation while breeding (Lima 1987). The key evidence supporting a cost of reproduction comes from brood manipulation experiments with temperate zone birds (Nur 1988, 1990).
4; Wikelski et al. 8 ng m1-1 in the Clay-colored Robin. 5 ng ml -~ (Wingfield 1984, Beletsky et al. 1989b, Ketterson et al. 1992, Johnsen 1998, Hau et al. 2000). Testosterone level is so low in breeding males of some tropical species that it is difficult to even detect (Wikelski et al. 1999a,b, 2000, Hau et al. 2000). Despite this, males vigorously sing, defend territories, attack intruders and pair with females, and females are also fiercely territorial and sing. We view the high testosterone levels of temperate zone birds as an adaptation for competing for EPFs.