Periphyton in the Volta Lake. II. Seasonal changes on wooden blocks with depth |
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Authors: | D M John E K Obeng-Asamoa H N Appler |
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Institution: | (1) Department of Botany, University of Ghana, Legon;(2) Present address: Department of Botany, British Museum (Natural History), Cromwell Road, SW7 5BD London;(3) Present address: Volta Lake Research and Development Project, Akosombo, Ghana;(4) Present address: Institute of Aquatic Biology, Achimota, Ghana |
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Abstract: | A seasonal study of the periphyton developed on wooden blocks suspended at five constant depths (0, 0.5, 1, 2, 5 m) in the Pawm-pawm arm of the Volta Lake is reported. The early colonizers at all depths were diatom species, they gradually declined in diversity and numbers and blue-green algae and green algae became more common. After one year the shallower (0–1 m) blocks were covered by a luxuriant growth of filamentous green algae though at lower levels diatoms predominated. Diversity and cell numbers of algae decreased with depth, this was most pronounced below 2 m. It appears that filamentous green algae eventually come to dominate wooden surfaces floating at relatively shallow depths in the Volta Lake. |
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Keywords: | Periphyton artificial substrates seasonality diversity cell numbers succession depth Volta Lake |
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