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Invasive Ants Alter Foraging and Parental Behaviors of a Native Bird
Author(s) -
Ligon Russell A.,
Siefferman Lynn,
Hill Geoffrey E.
Publication year - 2012
Publication title -
ethology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.739
H-Index - 74
eISSN - 1439-0310
pISSN - 0179-1613
DOI - 10.1111/j.1439-0310.2012.02076.x
Subject(s) - foraging , ecology , predation , biology , nest (protein structural motif) , fire ant , competition (biology) , introduced species , invasive species , red imported fire ant , hymenoptera , biochemistry
Introduced species can exert outsized impacts on native biota through both direct (predation) and indirect (competition) effects. Ants frequently become established in new areas after being transported by humans across traditional biological or geographical barriers, and a prime example of such establishment is the red imported fire ant ( S olenopsis invicta ). Introduced to N orth A merica in the 1930s, red imported fire ants are now firmly established throughout the southeastern U nited S tates. Although these invasive predators can dramatically impact native arthropods, their effect on vertebrates through resource competition is essentially unknown. Using a paired experimental design, we compared patterns of foraging and rates of provisioning for breeding eastern bluebirds ( S ialia sialis ) in unmanipulated (control) territories to those in adjacent (treated) territories where fire ants were experimentally reduced. Bluebirds inhabiting treated territories foraged nearer their nests and provisioned offspring more frequently than bluebirds inhabiting control territories with unmanipulated fire ant levels. Additionally, nestlings from treated territories were in better condition than those from control territories, though these differences were largely confined to early development. The elimination of significant differences in body condition toward the end of the nestling period suggests that bluebird parents in control territories were able to make up the food deficit caused by fire ants, potentially by working harder to adequately provision their offspring. The relationship between fire ant abundance and bluebird behavior hints at the complexity of ecological communities and suggests negative effects of invasive species are not limited to taxa with which they have direct contact.