Host-instar selection in the aphid parasitoid Monoctonus paulensis (Hymenoptera: Braconidae, Aphidiinae): a preference for small pea aphids

Title:

Host-instar selection in the aphid parasitoid Monoctonus paulensis (Hymenoptera: Braconidae, Aphidiinae): a preference for small pea aphids

Creator:

Chau, Amanda and Mackauer, Manfred

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:aadac61a-8f09-47c1-ae2b-1dfe5c458340
uuid:aadac61a-8f09-47c1-ae2b-1dfe5c458340

Subject:

Acyrthosiphon pisum, Aphidiinae, aphids, Braconidae, host choice, host size, Monoctonus paulensis, parasitoid, pea aphid, and specifity

Type:

article, model:article, and TEXT

Description:

Monoctonus paulensis is a solitary parasitoid of several species of aphids, including the pea aphid, Acyrthosiphon pisum. We evaluated host-instar selection by comparing the parasitoid's preference for the four nymphal instars of the pea aphid, presented two at a time in dichotomous choice tests. Females parasitized more, and laid more eggs in, the relatively smaller aphids among those available. This preference was independent of aphid instar: L1 > L2 > L3 > L4. Preference was not influenced by female size or age. Normal and anaesthetized aphids were accepted equally. The total time needed by a female to capture, position, and parasitize an aphid varied among host instars, with fourth instars requiring nearly twice as much time as first, second, and third instars. The probability of an attacked aphid escaping or avoiding parasitism increased with aphid instar, from ~10% in first and second instars to ~50% in fourth instars. Although fourth-instar pea aphids contain more resources for offspring development than smaller counterparts, it may not be profitable for a female to invest opportunity time in attacks on large aphids.

Language:

English

Rights:

http://creativecommons.org/publicdomain/mark/1.0/
policy:public

Source:

European Journal of Entomology | 2000 Volume:97 | Number:3

Harvested from:

CDK

Metadata only:

false