2009
DOI: 10.1111/j.1600-0706.2008.16997.x
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Density‐dependent age at first reproduction in the eastern kingbird

Abstract: Theory predicts that maximal fitness is obtained by individuals who begin to breed immediately upon reaching sexual maturity. However, delayed breeding occurs regularly in some taxa, and in birds and mammals is most often associated with long lifespan and/or limited access to suitable habitats. Delayed breeding is not expected among relatively short-lived species such as migratory passerine birds, but this assumption remains untested in many species. Here we quantify age at first reproduction in an eastern kin… Show more

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Cited by 34 publications
(56 citation statements)
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References 50 publications
(56 reference statements)
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“…Nonterritorial kingbirds are difficult to detect and are usually seen only several times per year (Cooper et al 2009b), and it is unlikely that their first sighting date was their day of arrival. As a result, nonbreeding birds were excluded except for analyses of the relationship between the probability of acquiring a mate and arrival date.…”
Section: Field Methodsmentioning
confidence: 99%
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“…Nonterritorial kingbirds are difficult to detect and are usually seen only several times per year (Cooper et al 2009b), and it is unlikely that their first sighting date was their day of arrival. As a result, nonbreeding birds were excluded except for analyses of the relationship between the probability of acquiring a mate and arrival date.…”
Section: Field Methodsmentioning
confidence: 99%
“…Benefits of early arrival: territory and mate acquisition Kingbirds must possess both a territory and a mate to breed successfully because intraspecific brood parasitism does not occur ) and only a very small percentage of nonterritorial male kingbirds sire young (Cooper et al 2009b). Kingbirds of both sexes settled quickly (1-2 days) after arrival, and because the number of suitable territories was limited (Cooper et al 2009b), fewer territories were inevitably available to late arrivers.…”
Section: Arrival Date and Individual Qualitymentioning
confidence: 99%
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“…However, breeding site fidelity is often strong in males and they regularly return to previously used sites even when other potentially better sites are available (Murphy 1996b). Further, as with males, female kingbirds may fail to acquire a territory and be precluded from breeding (Cooper et al 2008), and acquisition of a high‐quality territory is probably more important for female kingbirds because their reproductive success depends only on the young produced from their nest, whereas male reproductive success is a function of both within‐ and extra‐pair fertilizations. For kingbirds, the latter is independent of territory quality, but is correlated with size and song performance (Dolan et al 2007).…”
mentioning
confidence: 99%
“…This does not appear to be the case for kingbirds at our study site, however, because males and females have similar survival rates (Redmond, unpubl. data) and both sexes are equally common in the floater population (Cooper et al 2008). Thus, we feel confident in rejecting the hypothesis that protandry evolved as a response to competition for a limited supply of females.…”
mentioning
confidence: 99%