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001-es BibID:BIBFORM030378
Első szerző:Tökölyi Jácint (biológus)
Cím:Timing of avian reproduction in unpredictable environments / Jácint Tökölyi, John M. McNamara, Alasdair I. Houston, Zoltán Barta
Dátum:2011
ISSN:0269-7653
Megjegyzések:Organisms living in periodically varying environments adjust their life history events to the changes in food availability. When these changes are not entirely predictable animals face a trade-off between maintaining physiological preparedness (which can be costly) and being unprepared (which decreases the chances of successful reproduction). To investigate this problem, we developed an optimal annual routine model of gonad regulation in birds. Most birds regress their reproductive organs during non-breeding periods, but to start breeding again they need to have functional gonads. Maintaining the gonads in this state is costly, but because it takes time to achieve this state, if gonads are not functional the bird may miss a possible breeding opportunity. We explore the resolution of this trade-off in environments where favorable periods can occur at any time of the year and variability in the length of good and bad periods can be altered. Consistent with empirical studies of reproductive behavior in unpredictable environments, we find that birds maintain the gonads partially activated during unfavorable conditions in many cases. However, gonad regulation may differ strikingly depending on the consistency of the good and bad periods. Furthermore, seasonal changes in food availability lead to the entrainment of reproduction and the segregation of the breeding and non-breeding season, even if the magnitude of seasonality is small compared to the degree of environmental fluctuations. These results indicate that several aspects of the environment need to be taken into account to understand reproductive behavior in unpredictable environments. Given that the tradeoff between the costs and benefits of maintaining physiological preparedness is not limited
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Phenotypic flexibility
Annual routine
Gonadal cycle
Breeding season
Opportunism
Egészség- és Környezettudomány
Megjelenés:Evolutionary Ecology. - 26 : 1 (2011), p. 25-42. -
További szerzők:McNamara, John M. Houston, Alasdair I. Barta Zoltán (1967-) (biológus, zoológus)
Pályázati támogatás:TÁMOP-4.2.1/B-09/1-KONV-2010-0007
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