Extra-pair paternity in Swainson%26apos;s Hawks

作者：Briggs Christopher W^*; Collopy Michael W

来源：Journal of Field Ornithology, 2012, 83(1): 41-46.

DOI：10.1111/j.1557-9263.2011.00354.x

• Buteo swainsoni
• extra-pair fertilization
• mating system
• microsatellite
• raptor

Although passerines have been relatively well studied and many species found to exhibit relatively high rates of extra-pair paternity (EPP), less is known about the frequency of EPP in other avian taxa, including raptors. From 2008 to 2010, we examined the frequency of EPP in a population of Swainson%26apos;s Hawks (Buteo swainsoni) in Butte Valley, California. We examined paternity of 56 nestlings from 19 pairs and 27 broods and found that only three nestlings (5%) in two (7%) broods were the result of extrapair fertilizations. This relatively low frequency of EPP may be the result of mechanisms that reduce the likelihood of extra-pair fertilization (e.g., mate guarding and frequent copulation), or could result from females limiting EPP to assure paternity of the social male and ensure paternal investment in offspring.

• 出版日期2012-2