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The influence of habitat quality on the foraging strategies of the entomopathogenic nematodes Steinernema carpocapsae and Heterorhabditis megidis

Published online by Cambridge University Press:  16 October 2009

L. M. KRUITBOS
Affiliation:
Institute of Biological and Environmental Sciences, University of Aberdeen, Cruickshank Building, Aberdeen, AB24 3UU, UK
S. HERITAGE
Affiliation:
Forestry Commission, Northern Research Station, Roslin. MidlothianEH25 9SY, UK
S. HAPCA
Affiliation:
Simbios Centre, University of Abertay Dundee, 40 Bell Street, DundeeDD1 1HG, UK
M. J. WILSON*
Affiliation:
Institute of Biological and Environmental Sciences, University of Aberdeen, Cruickshank Building, Aberdeen, AB24 3UU, UK
*
*Corresponding author: Institute of Biological and Environmental Sciences, University of Aberdeen, Cruickshank Building, AberdeenAB24 3UU, UK. Tel: +44 1224 272845. Fax: +44(0) 1224 272945. E-mail: [email protected]

Summary

Entomopathogenic nematodes (EPN) are soil-transmitted parasites and their foraging strategies are believed to range from ‘ambush’ to ‘cruise’ foragers. However, research on their behaviour has not considered the natural habitat of these nematodes. We hypothesized that EPN behaviour would be influenced by soil habitat quality and tested this hypothesis using 2 EPN species Steinernema carpocapsae (an ‘ambusher’) and Heterorhabditis megidis (a ‘cruiser’) in 2 contrasting habitats, sand and peat. As predicted from previous studies, in sand most S. carpocapsae remained at the point of application and showed no taxis towards hosts, but in peat S. carpocapsae dispersed much more and showed a highly significant taxis towards hosts. H. megidis dispersed well in both media, but only showed taxis towards hosts in sand. In outdoor mesocosms in which both species were applied, S. carpocapsae outcompeted H. megidis in terms of host finding in peat, whereas the opposite was true in sand. Our data suggest that these 2 EPN may be habitat specialists and highlight the difficulties of studying soil-transmitted parasites in non-soil media.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2009

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