You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Fungivorous Pegomya flies: spatial and temporal variation in a guild of competitors
Gunilla Ståhls, Eugenia Ribeiro and Ilkka Hanski
Annales Zoologici Fennici
Vol. 26, No. 2 (1989), pp. 103-112
Published by: Finnish Zoological and Botanical Publishing Board
Stable URL: http://www.jstor.org/stable/23736061
Page Count: 10
You can always find the topics here!Topics: Insect larvae, Diapause, Aggregation, Mycology, Fungi, Flies, Species, Insect ecology, Natural resources, Female animals
Were these topics helpful?See somethings inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Fourteen species of Pegomya (Anthomyiidae) are the only significant primary fungivorous flies breeding in Leccinum (Boletaceae) sporophores in Finland. The length of the thorax in the flies is negatively correlated with the number of flies emerging from a sporophore, suggesting increasing larval competition with increasing numbers of larvae in sporophores. Further evidence of competition is provided by a geographical comparison: in Central Europe there are only 2 species of Pegomya that use Leccinum, but their abundance is as high as the pooled abundance of all Pegomya in Finland, i.e. 20 to 50 flies per sporophore. We demonstrate that Pegomya are intraspecifically aggregated amongst sporophores, which will contribute to the coexistence of many species in spite of competition. In Finland, the number of abundant species is about 7 throughout the country, though the species pool decreases from south (13) to north (7). Predation of full-grown larvae and pupae is also severe and may inflict up to 90% mortality. Prolonged diapause is common in Pegomya in Lapland but not in south Finland, probably because of increasing year-to-year variation in sporophore production with latitude.
Annales Zoologici Fennici © 1989 Finnish Zoological and Botanical Publishing Board