Document Detail


No evidence for a Ganoderma spore dispersal mutualism in an obligate spore-feeding beetle Zearagytodes maculifer.
MedLine Citation:
PMID:  21802057     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The role of spore dispersal mutualism remains equivocal in many fungus-insect assemblages. We tested experimentally whether an obligate spore-feeding beetle Zearagytodes maculifer has a mutualistic relationship with its host bracket fungus Ganoderma cf. applanatum via spore dispersal. We asked three specific questions: (1) whether or not Ganoderma spore germination rate is increased via beetle digestive activity and (2) is dependent on temperature and sporocarp identity. Spore germination rates were examined in 2×3×2 factorial experiments (spores consumed by beetles or not×temperature 20, 25, and 30°C×two independent pairs of sporocarp-beetle populations) replicated five times in an array of 60 experimental cultures. Analysis showed that consumption by beetles significantly reduced germination rate of Ganoderma spores. The effect of temperature was modulated by the effect of individual sporocarp, and was overridden by beetle feeding. Microscopic analysis revealed that spores from beetle faecal pellets exhibited extensive damage to their thin outer walls (pellicles) and thick inner walls, as well as significant loss of cytoplasm, while control spores were intact. The overall evidence argued against our spore dispersal mutualism hypothesis, suggesting that Z. maculifer can potentially exert a negative, if vanishingly small, fitness effect on its host fungus G. cf. applanatum.
Authors:
Kohmei Kadowaki; Richard A B Leschen; Jacqueline R Beggs
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Publication Detail:
Type:  Journal Article     Date:  2011-06-16
Journal Detail:
Title:  Fungal biology     Volume:  115     ISSN:  1878-6146     ISO Abbreviation:  Fungal Biol     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-08-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101524465     Medline TA:  Fungal Biol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  768-74     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 The British Mycological Society. Published by Elsevier Ltd. All rights reserved.
Affiliation:
School of Biological Sciences, The University of Auckland, Tamaki Campus, Building 733, Auckland 1142, New Zealand.
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