Abstract:
:The intensity of resource exploitation by phytophagous insects is usually considered to reflect population size. For populations of two flowerhead-attacking tephritid flies, however, the resources utilised were not related to the numbers of searching adults. Tephritis bardanae Schrank attacked 11-13% of the total flowerheads each year, and Cerajocera tussilaginis (Fab) 17-65%, despite much wider and uncorrelated variation in adult numbers. Analysis of field data showed that the proportion of flowerheads used was not limited by poor flowerhead quality, but was restricted by (1) the synchronisation of adult activity with the appearance of flowerheads at the correct age for oviposition, and (2) by factors which influenced the ability of female flies to locate available heads. These restrictions were more severe in T. bardanae and explained its relatively low rate of infestation. Both tephritids tended to avoid flowerheads in open areas. The processes governing resource exploitation in each tephritid operated independently of the other, and a partial separation of the two species between flowerhead types and habitats arose simply because of their different timing of attack.
journal_name
Oecologiajournal_title
Oecologiaauthors
Straw NAdoi
10.1007/BF00318315subject
Has Abstractpub_date
1991-05-01 00:00:00pages
492-502issue
4eissn
0029-8549issn
1432-1939pii
10.1007/BF00318315journal_volume
86pub_type
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