| 要旨トップ | 目次 | 日本生態学会第63回全国大会 (2016年3月、仙台) 講演要旨
ESJ63 Abstract


一般講演(ポスター発表) P1-209 (Poster presentation)

Experimental warming effects on the population growth and composition of a crop pest (soybean aphid) and the consequences for pest colonization under biocontrol

*Wang, Y. J.(Natl. Taiwan Univ.), Nakazawa, T.(Natl. Cheng Kung Univ.), Ho, C. K.(Natl. Taiwan Univ.)

Warming can potentially change crop pest population size and composition, consequently affecting crop production and food security. To examine warming impact on crop pests, we investigated predicted warming effect (2-4oC) on aphid population size and composition (alate proportion), and then manipulated initial alate proportion accordingly to compare aphid colonization under ladybug presence/absence.

Warming had no effect on population size, but reduced alate proportion from 5% to 1 % and interacted with ladybug presence. Specifically, aphid outbreaks in high alate proportion happened earlier with ladybug presence, while aphid outbreaks in low alate proportion happened later without ladybugs. These results were supported by modeling. Our findings suggest that warming may not necessarily increase crop pest population, but limit their colonization by changing population composition (alate proportion), making pests more susceptible to predation. In other words, biocontrol by predators may become more promising under future warming.


日本生態学会