|| 要旨トップ | 本企画の概要 |||日本生態学会第59回全国大会 (2012年3月，大津) 講演要旨
シンポジウム S02-5 (Lecture in Symposium/Workshop)
Invasive species and in particular ants are one of the most important threats for biodiversity but are mostly restricted to human disturbed environments. Invasive species remain rare in most undisturbed habitats. The Asian needle ant, Pachycondyla chinensis, was introduced no fewer than 75 years ago to the United States. Recently it was noticed that this species is increasing in abundance and expanding into not only disturbed but also undisturbed forest ecosystems of the southeastern USA. We evaluated the impact of this species on the native ant communities in four forests in North Carolina. We also conducted behavioral observations of P.chinensis and native species. Our results show that P. chinensis has a strong negative impact on most native ant species, with apparent local extinction. However, several native ant species appear to increase in abundance where P. chinensis is present. Interestingly, while the displacement of native ants has been linked to the superior competitive abilities of invasives in several cases, our results indicate that the atypical foraging behavior of P. chinensis does not support this hypothesis.