PRELIMINARY DATA ON THE ECOLOGY OF THE LEVEL-BOTTOM FAUNA OF LAKE TIBERIAS
In: Israel Journal of Ecology and EvolutionSearch for other papers by A. GITAY in
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The collection of benthic fauna and environmental data along two profiles revealed the existence of four successive faunai zones. Their absolute depth limits vary throughout the Lake as a function of local edaphic and hydrographical factors. The profundal has a maximum depth of 42 m. Its silt and clay bottom, containing up to 4.08% organic matter, has an annual temperature fluctuation between 14–18°. Although summer stratification causes no oxygen to be present for 8–9 months, the fauna here is excessively rich in specimens. It is composed almost exclusively of the nematode Eudorylaimus andrassyi and the oliogochaete Euilyodrilus heuscheri, which probably show a very advanced adaptation to anaerobic life. During the few winter months of homothermy when the water is oxygenated, an additional short-lived fauna appears, partly from resting eggs and partly through downward migration. Lake Tiberias, though brackish, is a highly productive, warm monomictic lake which for most of the year has two separate trophic systems, one of them anaerobic. The term separatrophic is proposed for this type of lake.
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PRELIMINARY DATA ON THE ECOLOGY OF THE LEVEL-BOTTOM FAUNA OF LAKE TIBERIAS
In: Israel Journal of Ecology and EvolutionSearch for other papers by A. GITAY in
Current site
Google Scholar
PubMed
The collection of benthic fauna and environmental data along two profiles revealed the existence of four successive faunai zones. Their absolute depth limits vary throughout the Lake as a function of local edaphic and hydrographical factors. The profundal has a maximum depth of 42 m. Its silt and clay bottom, containing up to 4.08% organic matter, has an annual temperature fluctuation between 14–18°. Although summer stratification causes no oxygen to be present for 8–9 months, the fauna here is excessively rich in specimens. It is composed almost exclusively of the nematode Eudorylaimus andrassyi and the oliogochaete Euilyodrilus heuscheri, which probably show a very advanced adaptation to anaerobic life. During the few winter months of homothermy when the water is oxygenated, an additional short-lived fauna appears, partly from resting eggs and partly through downward migration. Lake Tiberias, though brackish, is a highly productive, warm monomictic lake which for most of the year has two separate trophic systems, one of them anaerobic. The term separatrophic is proposed for this type of lake.
| All Time | Past 365 days | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 110 | 27 | 9 |
| Full Text Views | 14 | 0 | 0 |
| PDF Views & Downloads | 10 | 0 | 0 |
