Presence of conspecifics triggers host searching behavior in an egg parasitoid wasp

Hiroyuki Hirayama, Takayuki So, Eiiti Kasuya

研究成果: ジャーナルへの寄稿記事

抄録

Parasitoids and predators compete for host or prey species. The efficiency of obtaining prey or host items is reduced by intraspecific competition. As the optimal search behavior depends on the intensity of competition, it is important for the parasitoid or predator to obtain information on this intensity. Previous studies have shown that parasitoids can obtain information regarding competition from encounters with already parasitized hosts. They then change their host searching behavior accordingly. However, whether parasitoids obtain the information directly from observing the presence of conspecifics remains unclear. We used Tiphodytes gerriphagus (Marchal) (Hymenoptera: Scelionidae), the solitary egg parasitoid of water striders, for testing the effect of density of conspecifics on host searching behavior. Females of T. gerriphagus dive into the water to search for hosts and sometimes they dive without hosts present. Thus, we investigated whether T. gerriphagus changed underwater activities in response to the density of conspecifics in the absence of hosts. Four densities (1, 2, 4, and 8 female T. gerriphagus) were investigated. Females in competitive situations (groups of 2, 4, and 8 females) displayed host searching behavior, but the solitary females did not. This indicates that the presence of conspecifics triggers host searching behavior and that T. gerriphagus females obtain information on competition directly from conspecifics and use it for modifying their behavior.

元の言語英語
ページ(範囲)222-227
ページ数6
ジャーナルEntomologia Experimentalis et Applicata
154
発行部数3
DOI
出版物ステータス出版済み - 3 1 2015

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egg parasitoid
searching behavior
host seeking
wasp
parasitoids
Scelionidae
Gerridae
predators
intraspecific competition
parasitic wasps
predator
Hymenoptera
parasitoid

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Insect Science

これを引用

Presence of conspecifics triggers host searching behavior in an egg parasitoid wasp. / Hirayama, Hiroyuki; So, Takayuki; Kasuya, Eiiti.

:: Entomologia Experimentalis et Applicata, 巻 154, 番号 3, 01.03.2015, p. 222-227.

研究成果: ジャーナルへの寄稿記事

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