Life in Crumbling Clay: The Biology of Axarus Species (Diptera: Chironomidae) in the Connecticut River
| Autor: | Ed Klekowski, Sean F. Werle, Douglas G. Smith |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Northeastern Naturalist. 11:443-458 |
| ISSN: | 1938-5307 1092-6194 |
| DOI: | 10.1656/1092-6194(2004)011[0443:licctb]2.0.co;2 |
| Popis: | Larval midges in the genus Axarus are common macroinvertebrates in areas of the Connecticut River where varved clay substrates are found. Using SCUBA to make collections, we investigated the habitat use, species composition, and life history of the two Axarus species found in the river. Larvae were only found in clay or decaying wood, with a population density of 13,345 (± 4881) larvae/meter2 at one site. Two species were found co-existing in clays in northern sites, while only one species was found in southern collections. The species are temporally isolated, with adult emergence for the southern species preceding that of the northern species. Life history data are presented for the southern species, an undescribed taxon designated Axarus species varvestris. This species is univoltine with adult emergence taking place in late June in southern locations. The sex ratio at emergence was 1:1, and protandry was evident. |
| Databáze: | OpenAIRE |
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