Ontogenetic shifts in intraguild predation on thrips by phytoseiid mites

Author(s)
A Walzer, HF Paulus, P Schausberger
Abstract

In greenhouse agroecosystems, a guild of spider mite predators may consist of the oligophagous predatory mite Phytoseiulus persimilis Athias-Henriot, the polyphagous predatory mite Neoseiulus californicus McGregor (both Acari: Phytoseiidae) and the primarily herbivorous but facultatively predatory western flower thrips Frankliniella occidentalis Pergande (Thysanoptera: Thripidae). Diet-specialization and the predator body size relative to prey are crucial factors in predation on F. occidentalis by P. persimilis and N. californicus. Here, it was tested whether the relevance of these factors changes during predator ontogeny. First, the predator (protonymphs and adult females of P. persimilis and N. californicus): prey (F. occidentalis first instars) body size ratios were measured. Second, the aggressiveness of P. persimilis and N. californicus towards F. occidentalis was assessed. Third, survival, development and oviposition of P. persimilis and N. californicus with F. occidentalis prey was determined. The body size ranking was P. persimilis females > N. californicus females > P. persimilis protonymphs > N. californicus protonymphs. Neoseiulus californicus females were the most aggressive predators, followed by highly aggressive N. californicus protonymphs and moderately aggressive P. persimilis protonymphs. Phytoseiulus persimilis females did not attack thrips. Frankliniella occidentalis larvae are an alternative prey for juvenile N. californicus and P. persimilis, enabling them to reach adulthood. Females of N. californicus but not P. persimilis sustained egg production with thrips prey. Within the guild studied here, N. californicus females are the most harmful predators for F. occidentalis larvae, followed by N. californicus and P. persimilis juveniles. Phytoseiulus persimilis females are harmless to F. occidentalis.

Organisation(s)
External organisation(s)
Universität für Bodenkultur Wien, Universität Wien
Journal
Bulletin of Entomological Research: containing original and review articles on economic entomology
Volume
94
Pages
577-584
No. of pages
8
ISSN
0007-4853
DOI
https://doi.org/10.1079/BER2004329
Publication date
12-2004
Peer reviewed
Yes
Austrian Fields of Science 2012
106047 Animal ecology, 106054 Zoology
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/ontogenetic-shifts-in-intraguild-predation-on-thrips-by-phytoseiid-mites(ea58a0b7-862a-4f71-94bd-fd05b417bc2c).html