Document Detail

Interactions among three trophic levels and diversity of parasitoids: a case of top-down processes in Mexican tropical dry forest.
MedLine Citation:
PMID:  17716469     Owner:  NLM     Status:  MEDLINE    
The objective of this study was to analyze the relationship between plant hosts, galling insects, and their parasitoids in a tropical dry forest at Chamela-Cuixmala Biosphere Reserve in western Mexico. In 120 transects of 30 by 5 m (60 in deciduous forest and 60 in riparian habitats), 29 galling insects species were found and represented in the following order: Diptera (Cecidomyiidae, which induced the greatest abundance of galls with 22 species; 76%), Homoptera (Psylloidea, 6.9%; Psyllidae, 6.9%; Triozidae, 3.4%), Hymenoptera (Tanaostigmatidae, 3.4%; which were rare), and one unidentified morphospecies (3.4%). In all cases, there was a great specificity between galling insect species and their host plant species; one galling insect species was associated with one specific plant species. In contrast, there was no specificity between parasitoid species and their host galling insect species. Only 11 species of parasitoids were associated with 29 galling insect species represented in the following families: Torymidae (18.2%), Eurytomidae (18.2%), Eulophidae (18.2%), Eupelmidae (9.1%), Pteromalidae (9.1%), family Braconidae (9.1%), Platygastridae (9.1%), and one unidentified (9.1%). Most parasitoid species parasitized several gall species (Torymus sp.: 51.1%, Eurytoma sp.: 49.7%, Torymoides sp.: 46.9%). Therefore, the effects of variation in plant defenses do not extend to the third trophic level, because a few species of parasitoids can determine the community structure and composition of galling insect species in tropical plants, and instead, top-down processes seem to be regulating trophic interactions of galling insect species in tropical gall communities.
Pablo Cuevas-Reyes; Mauricio Quesada; Paul Hanson; Ken Oyama
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental entomology     Volume:  36     ISSN:  0046-225X     ISO Abbreviation:  Environ. Entomol.     Publication Date:  2007 Aug 
Date Detail:
Created Date:  2007-08-24     Completed Date:  2007-10-10     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7502320     Medline TA:  Environ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  792-800     Citation Subset:  IM    
Facultad de Biología, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Michoacán, Mexico.
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MeSH Terms
Feeding Behavior / physiology*
Food Chain*
Host-Parasite Interactions
Insects / physiology*
Trees / parasitology*

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