Avoidance of a generalist entomopathogenic fungus by the ladybird, Coccinella septempunctata

A - Papers appearing in refereed journals

Ormond, E. L., Thomas, A. P. M., Pell, J. K., Freeman, S. N. and Roy, H. E. 2011. Avoidance of a generalist entomopathogenic fungus by the ladybird, Coccinella septempunctata. FEMS Microbiology Ecology. 77 (2), pp. 229-237.

AuthorsOrmond, E. L., Thomas, A. P. M., Pell, J. K., Freeman, S. N. and Roy, H. E.
Abstract

Fungal entomopathogens are ubiquitous within the environment and susceptible insects are predicted to be under strong selection pressure to detect and avoid virulent isolates. Beauveria bassiana is an entomopathogenic fungus with a wide host range including coccinellids. Seven-spot ladybirds, Coccinella septempunctata, overwinter predominantly in leaf litter and B. bassiana is one of their major mortality factors during winter in temperate regions. Behavioural assays were conducted to assess the ability of adult C. septempunctata to avoid lethal densities of B. bassiana conidia in soil or on leaves. Further assays considered avoidance by C. septempunctata of mycosed (B. bassiana) C. septempunctata cadavers compared with uninfected C. septempunctata cadavers or in vitro B. bassiana. Treatments in any bioassays entirely avoided by C. septempunctata were regarded as censored data, to overcome the difficulties associated with zeros in log-ratio analyses. Male and female C. septempunctata avoided contact with leaf surfaces and soil inoculated with B. bassiana and mycosed cadavers. The ability of C. septempunctata to detect and avoid B. bassiana conidia is an adaptation that undoubtedly increases survival and ultimately fitness. We predict that such behavioural responses are widespread and driven by the high cost of fungal infection to a host.

KeywordsMicrobiology
Year of Publication2011
JournalFEMS Microbiology Ecology
Journal citation77 (2), pp. 229-237
Digital Object Identifier (DOI)doi:10.1111/j.1574-6941.2011.01100.x
PubMed ID21449938
Open accessPublished as non-open access
FunderEnvironmental Sciences Research Centre (Anglia Ruskin University)
Department of Life Sciences (Anglia Ruskin University)
DEFRA - Department for Environment, Food and Rural Affairs UK
NERC - Natural Environment Research Council - Centre for Ecology Hydrology - CEH
Joint Nature Conservation Committee - JNCC
Funder project or codeSEF
PublisherWiley
Oxford University Press (OUP)
ISSN0168-6496

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