期刊
ECOLOGY LETTERS
卷 19, 期 1, 页码 37-44出版社
WILEY-BLACKWELL
DOI: 10.1111/ele.12540
关键词
Ant-aphid mutualism; light environment; Ligusticum porteri; multi-trophic interactions
类别
资金
- National Science Foundation BIO REU grant (DBI) [1262713]
- NSF (DEB) [1457029]
Species abundance is typically determined by the abiotic environment, but the extent to which such effects occur through the mediation of biotic interactions, including mutualisms, is unknown. We explored how light environment (open meadow vs. shaded understory) mediates the abundance and ant tending of the aphid Aphis helianthi feeding on the herb Ligusticum porteri. Yearly surveys consistently found aphids to be more than 17-fold more abundant on open meadow plants than on shaded understory plants. Manipulations demonstrated that this abundance pattern was not due to the direct effects of light environment on aphid performance, or indirectly through host plant quality or the effects of predators. Instead, open meadows had higher ant abundance and per capita rates of aphid tending and, accordingly, ants increased aphid population growth in meadow but not understory environments. The abiotic environment thus drives the abundance of this herbivore exclusively through the mediation of a protection mutualism.
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