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|Title:||Two distinct reproductive strategies are correlated with an ovarian phenotype in co-existing parthenogenetic strains of a parasitic wasp|
|Author:||Beck, Markus Hans|
Theopold, Ulrich J.
|Citation:||Journal of Insect Physiology, 2001; 47 (10):1189-1195|
|School/Discipline:||School of Agriculture, Food and Wine : Plant and Food Science|
School of Agriculture, Food and Wine : Agricultural and Animal Science
|Markus Beck, Annette Reineke, Heidrun Lorenz, Ulrich Theopold and Otto Schmidt|
|Abstract:||The question whether different organisms are able to compete for the same resource is of fundamental importance to evolutionary biology. Sympatric co-existence of similar species on a single resource has long been claimed to be unstable. However, indirect evidence suggests that parasitic wasps exhibit evolutionarily stable mixtures of life-history strategies. Here we describe genetically distinct strains of a parthenogenetic wasp Venturia canescens, with different ovarian phenotypes that affect egg numbers in oviducts. Wasp females with large egg load search for caterpillars and deposit eggs immediately after host encounter, whereas females with fewer eggs delay parasitism. Since the outcome of interlarval competition within super-parasitized caterpillars depends on the age distribution of competing larvae, the two egg deposition strategies may co-exist under conditions that favor super-parasitism.|
|Keywords:||Super-parasitism; host competition; reproductive strategy; venturia canescens; virus-like particles|
|Appears in Collections:||Agriculture, Food and Wine publications|
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