Document Detail


Frass analysis of diets of aphidophagous lady beetles (Coleoptera: Coccinellidae) in Utah alfalfa fields.
MedLine Citation:
PMID:  20388290     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Aphidophagous lady beetles enhance their foraging success in natural settings by consuming other types of food in addition to aphids. Frass analysis was used to examine natural diets of female lady beetles in fields of alfalfa (Medicago sativa L.) in northern Utah. The first (spring) alfalfa crop was censused in 2004 and 2005 to determine the diet of female adults of the introduced Coccinella septempunctata L., and two native species, C. transversoguttata richardsoni Brown, and Hippodamia convergens Guerin. The proportion of females of the three lady beetle species that fed on pea aphids [Acyrthosiphon pisum (Harris)] and alfalfa weevil larvae [Hypera postica (Gyllenhal), an abundant alternative prey] increased from early to late season during the first crop. A corresponding seasonal decrease occurred in the proportion of females consuming other types of arthropods (e.g., thrips and collembolans) and nonarthropod food (pollen and fungal spores). Overall, frass analysis indicated that the diets of C. septempunctata and the two native species in alfalfa were similar in their inclusion of a broad variety of foods. The study shows that frass analysis can provide a good overview of the diets of lady beetles in natural settings.
Authors:
L Nicole Davidson; Edward W Evans
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental entomology     Volume:  39     ISSN:  1938-2936     ISO Abbreviation:  Environ. Entomol.     Publication Date:  2010 Apr 
Date Detail:
Created Date:  2010-04-14     Completed Date:  2010-07-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7502320     Medline TA:  Environ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  576-82     Citation Subset:  IM    
Affiliation:
Department of Biology, Utah State University, Logan, UT 84322-5305, USA; Northern Plains Agricultural Research Laboratory, USDA-ARS, 1500 North Central Avenue, Sidney MT 59270, USA.
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MeSH Terms
Descriptor/Qualifier:
Animals
Aphids
Beetles*
Diet*
Feces / chemistry*
Female
Larva
Medicago sativa
Seasons
Utah

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