Document Detail

Influence of nutrient deficiency caused by host developmental arrest on the growth and development of a koinobiont parasitoid.
MedLine Citation:
PMID:  17095007     Owner:  NLM     Status:  MEDLINE    
Koinobiont parasitoids utilize nutrients obtained from hosts that contine to feed and grow after parasitization. However, if the ecdysis of early host instars is prevented, parasitized larvae will fail to grow large enough to support the development of the parasitoid brood and both organisms will perish. When L5 instar larvae (the penultimate stage) of Pseudaletia separata were parasitized by Cotesia kariyai and injected with Euplectrus separatae venom (5PV), the development of these hosts was arrested before molting to the next stage and the caterpillars thus failed to gain weight. These hosts remained at approximately 300 mg until parasitoid emergence. In contrast, hosts parasitized as L5 but without the injection of venom (5P) exhibited an increase in weight after molting to the next stage and ultimately grew to approximately 700 mg. The inhibition of ecdysis reduced the amount of food resource (e.g. fat body) for the parasitoid larvae. On the other hand, when final (= L6) host instars were parasitized and injected with E. separatae venom (6PV), the maximum weight attained by these larvae was about 710 mg, although weight gain was depressed compared to hosts parasitized without the injection of E. separatae venom (6P). The adult weight of C. kariyai that emerged from 5PV hosts was less than conspecifics that emerged from 5P, 6P, and 6PV respectively, although the egg-pupal period of the parasitoid from 5PV hosts was extended. The offspring sex ratio (percentage males) of adult wasps did not vary significantly with treatment. Female parasitoids that eclosed from 5PV hosts laid almost the same number of eggs in day 0-6th host instars as those emerging from 5P, 6P, 6PV hosts. Their egg-pupal period was extended and the cocoon cluster mass and the parasitoid body mass on subsequent generations was lighter than those reared from 5P, 6P, 6PV hosts. The sex ratio of F2 C. kariyai wasps that eclosed from 5PV increased more than in wasps that eclosed from the other host treatments (5P, 6P, 6PV). Our results reveal that a reduction in host quality and offspring fitness in the first generation negatively impacted female fitness in the second generation. An early arrestment of host growth, mediated by the addition of E. separatae venom, has severe implications on parasitoid fitness by reducing host quality, especially in smaller hosts.
Y Nakamatsu; K Kuriya; J A Harvey; T Tanaka
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-07-15
Journal Detail:
Title:  Journal of insect physiology     Volume:  52     ISSN:  0022-1910     ISO Abbreviation:  J. Insect Physiol.     Publication Date:    2006 Nov-Dec
Date Detail:
Created Date:  2006-11-20     Completed Date:  2008-07-15     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  2985080R     Medline TA:  J Insect Physiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1105-12     Citation Subset:  IM    
Applied Entomology, Graduate School of Bio-Agricultural Sciences, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8601, Japan.
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MeSH Terms
Animal Nutritional Physiological Phenomena / drug effects,  physiology*
Body Weight / drug effects
Eating / drug effects
Host-Parasite Interactions / physiology
Hymenoptera / growth & development*
Larva / drug effects,  physiology
Moths / drug effects*,  growth & development,  parasitology*
Oviposition / physiology
Reproduction / drug effects
Sex Ratio
Time Factors
Wasp Venoms / administration & dosage,  pharmacology*
Reg. No./Substance:
0/Wasp Venoms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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