Does Host Value Influence Female Aggressiveness, Contest Outcome and Fitness Gain in Parasitoids?

Intraspecific competition for resources is common in animals and may lead to physical contests. Contest outcomes and aggressiveness can be influenced by the resource holding potential of contestants but also by their perception of the resource value (RV). Competitors may assess resource quality directly (real RV) but may also estimate it according to their physiological status and their experience of the habitat quality (subjective RV). In this article, we studied contests between females of the solitary parasitoid Pachycrepoideus vindemmiae Rondani (Hymenoptera: Pteromalidae) when exploiting simultaneously a host, a Delia radicum L. (Diptera: Anthomyiidae) pupa. We tested the effect of factors modifying host value on the occurrence of agonistic behaviours, contest outcomes and host exploitation. The factors tested were: the quality of the previous habitat experienced by females, female egg load, host parasitism status and the stage reached by the owner female in her behavioural oviposition sequence. Females successfully protected their host against intruders during its exploitation, but not after oviposition, and their aggressiveness did not seem to be influenced by their perception of the RV. The fact that the host is subsequently parasitized by the opponent females appears to mainly depend on the host selectiveness of females.

[1]  D. Scott,et al.  The importance of offspring value: maternal defence in parasitoid contests , 2007, Animal Behaviour.

[2]  R. Linforth,et al.  Volatile emission by contest losers revealed by real-time chemical analysis , 2006, Proceedings of the Royal Society B: Biological Sciences.

[3]  I. Hardy,et al.  The importance of valuing resources: host weight and contender age as determinants of parasitoid wasp contest outcomes , 2006, Animal Behaviour.

[4]  A. Cortesero,et al.  Patch exploitation strategies of parasitic wasps under intraspecific competition , 2005 .

[5]  Julio C. Rojas,et al.  VOLATILE COMPOUNDS RELEASED BY DISTURBED FEMALES OF CEPHALONOMIA STEPHANODERIS (HYMENOPTERA: BETHYLIDAE): A PARASITOID OF THE COFFEE BERRY BORER HYPOTHENEMUS HAMPEI (COLEOPTERA: SCOLYTIDAE) , 2005 .

[6]  I. Hardy,et al.  Insect gladiators II: Competitive interactions within and between bethylid parasitoid species of the coffee berry borer, Hypothenemus hampei (Coleoptera: Scolytidae) , 2005 .

[7]  A. Cortesero,et al.  Intraspecific Variations in Host Discrimination Behavior in the Pupal Parasitoid Pachycrepoideus vindemmiae Rondani (Hymenoptera: Pteromalidae) , 2004 .

[8]  A. Cortesero,et al.  Effect of expected offspring survival probability on host selection in a solitary parasitoid , 2003 .

[9]  J. Lachaud,et al.  Insect gladiators: competitive interactions between three species of bethylid wasps attacking the coffee berry borer, Hypothenemus hampei (Coleoptera: Scolytidae) , 2002 .

[10]  I. Hardy,et al.  Statistical analysis of sex ratios : an introduction. , 2002 .

[11]  I. Hardy,et al.  The importance of being gravid: egg load and contest outcome in a parasitoid wasp , 2000, Animal Behaviour.

[12]  J. Rosenheim,et al.  THE RELATIVE CONTRIBUTIONS OF TIME AND EGGS TO THE COST OF REPRODUCTION , 1999, Evolution; international journal of organic evolution.

[13]  S. A. Field,et al.  Don't count your eggs before they're parasitized contest resolution and the trade-offs during patch defense in a parasitoid wasp , 1999 .

[14]  C. Bernstein,et al.  State dependent superparasitism in a solitary parasitoid: egg load and survival , 1997 .

[15]  I. Hardy,et al.  The importance of being larger: parasitoid intruder–owner contests and their implications for clutch size , 1996, Animal Behaviour.

[16]  D. Phillips Host‐feeding and egg maturation by Pachycrepoideus vindemiae , 1993 .

[17]  David Rosen,et al.  Foraging and oviposition decisions in the parasitoid Aphytis lingnanensis : distinguishing the influences of egg load and experience , 1991 .

[18]  T. Blackburn,et al.  Brood guarding in a bethylid wasp , 1991 .

[19]  M. Mangel Evolution of Host Selection in Parasitoids: Does the State of the Parasitoid Matter? , 1989, The American Naturalist.

[20]  H. Godfray,et al.  Local mate competition, sex ratio and clutch size in bethylid wasps , 1988, Behavioral Ecology and Sociobiology.

[21]  O. Leimar,et al.  Evolution of fighting behaviour: The effect of variation in resource value , 1987 .

[22]  N. Kidd,et al.  HOST‐FEEDING STRATEGIES IN HYMENOPTERAN PARASITOIDS , 1986 .

[23]  O. Leimar,et al.  Effects of asymmetries in owner-intruder conflicts , 1984 .

[24]  J M Smith,et al.  Evolution and the theory of games , 1976 .

[25]  P. Lawrence Interference Competition and Optimal Host Selection in the Parasitic Wasp, Biosteres longicaudatus , 1981 .

[26]  P. Hammerstein The role of asymmetries in animal contests , 1981, Animal Behaviour.

[27]  John Maynard Smith,et al.  The logic of asymmetric contests , 1976, Animal Behaviour.

[28]  G. Parker,et al.  Assessment strategy and the evolution of fighting behaviour. , 1974, Journal of theoretical biology.

[29]  J. M. Smith,et al.  The Logic of Animal Conflict , 1973, Nature.

[30]  A. Cortesero,et al.  Selection Strategies of Parasitized Hosts in a Generalist Parasitoid Depend on Patch Quality but Also on Host Size , 2004, Journal of Insect Behavior.

[31]  J. Nénon,et al.  A method for rearing Trybliographa rapae W. on Delia radicum L. , 1996 .

[32]  H. Godfray Parasitoids: Behavioral and Evolutionary Ecology , 1993 .

[33]  Williams,et al.  Review Of "The Behavioural Biology Of Aggression" By J. Archer , 1989 .

[34]  L. M. Rueda Guide to common species of pupal parasites (Hymenoptera, Pteromalidae) of the house fly and other muscoid flies associated with poultry and livestock manure. , 1985 .