Document Detail


Trophic eggs compensate for poor offspring feeding capacity in a subsocial burrower bug.
MedLine Citation:
PMID:  20880861     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Various animals produce inviable eggs or egg-like structures called trophic eggs, which are presumed to be an extended maternal investment for the offspring. However, there is little knowledge about the ecological or physiological constraints associated with their evolutionary origin. Trophic eggs of the seminivorous subsocial burrower bug (Canthophorus niveimarginatus) have some unique characteristics. Trophic eggs are obligate for nymphal survival, and first-instar nymphs die without them. To identify the cause of nymphal death, we hypothesized that first-instar nymphs starve to death because they cannot feed on anything but trophic eggs. Although first-instar nymphs fed on artificially exposed endosperm did survive, nymphs that were provided with intact seed were not able to penetrate the seed vessel and starved to death. Another hypothesis that trophic eggs play a role in transferring the midgut symbiont, essential for survival in heteropteran bugs, from mother to offspring was rejected because almost all nymphs had retained the symbiont without feeding on trophic eggs. These results suggest that poor feeding capacity of the offspring is the cause of nymphal death, and the important constraint that promotes the evolution of the curious trophic egg system in C. niveimarginatus.
Authors:
Narumi Baba; Mantaro Hironaka; Takahiro Hosokawa; Hiromi Mukai; Shintaro Nomakuchi; Takatoshi Ueno
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-09-29
Journal Detail:
Title:  Biology letters     Volume:  7     ISSN:  1744-957X     ISO Abbreviation:  Biol. Lett.     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-03-14     Completed Date:  2011-06-29     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  101247722     Medline TA:  Biol Lett     Country:  England    
Other Details:
Languages:  eng     Pagination:  194-6     Citation Subset:  IM    
Affiliation:
Institute of Biological Control, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan. baba_na@agr.kyushu-u.ac.jp
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MeSH Terms
Descriptor/Qualifier:
Animals
Feeding Behavior
Female
Heteroptera / growth & development,  physiology*
Nymph / growth & development,  physiology
Reproduction
Symbiosis
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