Abstract:
:Early models of hostplant exploitation by phytophagous insects suffer from unwarranted assumptions and may not be generally applicable. Wordmodels of the co-evolutionary approach may assume unwarranted evolutionary stability in 'strategic' explanations, whilst mathematical models derived from earlier optimal-diet studies are unrealistic and unwieldy. A simple arithmetic model synthesises these two approaches, using the two parameters of foodplant suitability and availability. Hostplant use by the butterfly Anthocharis cardamines, previously thought to be maladaptively polyphagous, is shown to be optimal under prevailing conditions of short search time. The predictions of the model for hostplant use and community structure of butterflies and other phytophagous insects are tested and, in large part, corroborated. Monophagy and monophagic forms of oligophagy are shown to be favoured by: long adult lifespan; low search costs to females; search images (Whether visual or olfactory); batch-laying of eggs; high differential in foodplant suitability.
journal_name
Oecologiajournal_title
Oecologiaauthors
Courtney SPdoi
10.1007/BF00541116subject
Has Abstractpub_date
1982-01-01 00:00:00pages
101-107issue
1eissn
0029-8549issn
1432-1939pii
10.1007/BF00541116journal_volume
54pub_type
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