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Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.

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A note on the zooplankton distribution and diversity in a tropical mangrove creek system, Gazi, Kenya Osore, M. (1992). A note on the zooplankton distribution and diversity in a tropical mangrove creek system, Gazi, Kenya, in: Jaccarini, V. et al. The ecology of mangrove and related ecosystems: Proceedings of the international symposium held at Mombasa, Kenya, 24-30 September 1990. Developments in Hydrobiology, 80: pp. 119-120. https://dx.doi.org/10.1007/978-94-017-3288-8_12 In: Jaccarini, V.; Martens, E.E. (Ed.) (1992). The ecology of mangrove and related ecosystems: Proceedings of the international symposium held at Mombasa, Kenya, 24-30 September 1990. Reprinted from Hydrobiologia, vol. 247. Developments in Hydrobiology, 80. Springer Science+Business Media: Dordrecht. ISBN 978-0-7923-2049-4; e-ISBN 978-94-017-3288-8. XII, 266 pp. https://dx.doi.org/10.1007/978-94-017-3288-8, meer In: Dumont, H.J. (Ed.) Developments in Hydrobiology. Kluwer Academic/Springer: The Hague; London; Boston; Dordrecht. ISSN 0167-8418, meer Is gerelateerd aan: Osore, M. (1992). A note on the zooplankton distribution and diversity in a tropical mangrove creek system, Gazi, Kenya. Hydrobiologia 247: 119-120. https://dx.doi.org/10.1007/BF00008210, meer

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Documenttype: Congresbijdrage

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Trefwoord

Brak water

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Osore, M., meer

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Abstract

Gazi Creek is situated at some 40 km south of Mombasa (Kenya 4° 25' S, 39° 50' E) sampling stations are located in the creek mouth (stn 1), in the inner creek (stn 3) and intermediate (stn 2). Sampling is done twice a month; it starts from stn 1 through stn 2 up to stn 3. A 335 µm mesh size net is towed in near surface water for 5 minutes and the collected sample preserved in 5% formaldehyde. Hydrographic parameters are recorded during sampling. The work at Gazi is undertaken to survey the Zooplankton composition both qualitatively and quantitatively. 22 important taxa have been studied to determine their seasonal variation in abundance and distribution. Zooplankton population are highest in March (374 animals m- 3). The abundance gradually falls during the S"E" monsoon period (May-September) to the lowest value in August (30 animals m- 3) (see Fig. 1). Copepoda is the most abundant taxon throughout (48"5-92"4 %) (see Table 1). This group is found throughout the creek. Nevertheless, it is evident that the creek mouth has a higher diversity of Copepoda compared to the inner creek. Using the Margalef Index a consistently higher value has been observed in stn 1 compared to stn 3 (see Table 2). The surface water temperature decreases during the S"E" monsoon (28"0 to 25"5 OC) and it rises during the N"E" monsoon (29"0 to 35"5 OC). The trend in temperature variation corresponds broadly with zooplankton abundance (see Fig. 1), suggesting that zooplankton thrive best in warmer water. High Zooplankton counts were also observed around May (326 animals m- 3) during the long rains; probably due to high amounts of nutrients input. Generally, average monthly pH values vary only slightly but the pH up the creek is almost always lower than at the creek mouth. Salinity is quite constant at 35°/oo.

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