Abstract:
:Experiments are described which test the hypothesis that more host-specific species of caterpillars should be less aceptable to a generalist predator than polyphagous species. Caterpillars of all species were tested in paired choice tests with the Argentine ant, Iridomyrmex humilis. Experiments were replicated ten times, videotaped and later analyzed. Brightly colored specialist species (normally considered to be aposematic) were clearly the least palatable, while more cryptic specialists were also significantly less acceptable than generalists overall. Leaf-tying species were considered separately; all were highly palatable independent of host range. The results indicate that among caterpillars that do not construct leaf shelters, those with a wide post range are more acceptable than those with a narrow host range. This is consistent with the notion that generalist predators provide selection pressure favoring narrow host range in their herbivorous prey.
journal_name
Oecologiajournal_title
Oecologiaauthors
Bernays EA,Cornelius MLdoi
10.1007/BF00384324subject
Has Abstractpub_date
1989-05-01 00:00:00pages
427-30issue
3eissn
0029-8549issn
1432-1939journal_volume
79pub_type
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