Dried-up zone as a temporal stock of chironomid larvae: survival periods and density in a reservoir bank
| Autor: | Tetsuo Suemoto, Koichiro Kawai, Hiromichi Imabayashi |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Hydrobiologia. 545:145-152 |
| ISSN: | 1573-5117 0018-8158 |
| Popis: | The survival period, community composition and density of chironomid larvae were investigated at the reservoir bank in Yachiyoko Lake (Haji Dam), Hiroshima, Japan to verify their survivability in a dried-up zone. We define “dried-up zone” as the one that had been exposed to drought due to drawdown by evaporation and/or drainage. The larvae were collected from sediments at different altitudes along a transectional line. After larval rearing, 189 indiv. m−2 of adults emerged even from the sediment of a 7-day drought (17.1% sedimental water content). The proportion of Tanytarsus oyamai Sasa in the community tended to be larger with dry periods, indicating that this species has a higher drought tolerance than other species. The mean density in the dried-up zone was estimated as 886.4 indiv. m−2. Biomass is generally estimated by using the samples of only underwater sediment. These results show that some species have the potential to survive for at least one week in a dried-up zone and suggest that the biomass is likely to be highly underestimated for the entire ecosystem. A pathway of matter flow from aquatic to terrestrial ecosystems via the larvae in a dried-up zone should be taken into consideration. |
| Databáze: | OpenAIRE |
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