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Meiobenthos of hypersaline tropical mangrove sediment in relation to spring tide inundation Ólafsson, E.; Carlström, S.; Ndaro, G.M. (2000). Meiobenthos of hypersaline tropical mangrove sediment in relation to spring tide inundation, in: Liebezeit, G. et al. Life at Interfaces and Under Extreme Conditions: Proceedings of the 33rd European Marine Biology Symposium, Wilhelmshaven, Germany, 7-11 September 1998. Developments in Hydrobiology, 151: pp. 57-64. https://dx.doi.org/10.1007/978-94-011-4148-2_5 In: Liebezeit, G.; Dittmann, S.; Kröncke, I. (Ed.) (2000). Life at interfaces and under extreme conditions: Proceedings of the 33rd European Marine Biology Symposium, Wilhelmshaven, Germany, 7-11 September 1998. European Marine Biology Symposia, 33. Developments in Hydrobiology, 151. ISBN 978-0-7923-6468-9; e-ISBN 978-94-011-4148-2. VII, 210 pp. https://dx.doi.org/10.1007/978-94-011-4148-2, meer In: European Marine Biology Symposia., meer Is gerelateerd aan: Ólafsson, E.; Carlström, S.; Ndaro, G.M. (2000). Meiobenthos of hypersaline tropical mangrove sediment in relation to spring tide inundation. Hydrobiologia 426: 57-64. https://dx.doi.org/10.1023/A:1003992211656, meer

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Beschikbaar in	Auteurs
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Documenttype: Congresbijdrage

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Trefwoorden

Aquatic communities > Benthos > Meiobenthos Cycles > Tidal cycles Water bodies > Inland waters > Wetlands > Swamps > Mangrove swamps Chromadorina [WoRMS]; Daptonema Cobb, 1920 [WoRMS]; Metalinhomoeus de Man, 1907 [WoRMS]; Microlaimus de Man, 1880 [WoRMS] ISW, Tanzania, Zanzibar [Marine Regions] Marien/Kust

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Ólafsson, E. Carlström, S. Ndaro, G.M., meer

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Abstract

Tropical intertidal sediments often contain porewater of relatively high salinity, especially in areas exposed to longer periods without seawater inundation and high evaporation. Such an area exists on the west coast of Zanzibar: a high intertidal mangrove plateau, hooded only during spring high tides, with sediment porewater salinities commonly exceeding 100 ppt. A field survey was conducted in this area to examine variations in population density of major meiofaunal taxa and the assemblage structure of free-living marine nematodes during spring-neap tidal cycles. Samples were taken on seven occasions for two months, starting from the end of the rainy season. Porewater salinity remained high throughout the sampling period, ranging from 89 to 160 ppt. Neither spring tide inundation nor heavy rains lowered the salinity markedly. The meiofauna consisted only of four taxa, present on all sampling occasions: nematodes, harpacticoid copepods, plathyhelminthes and chironomids. Densities in surface sediments (0-5 cm) were low compared to other mangrove areas, ranging from 271 to 656 animals 10 cm-2 with nematodes dominant on all sampling occasions (58-87%). Density fluctuations could not be explained by the effects of spring tide inundation, but the meiofauna showed significant correlations with grain size and organic material. Despite the wide range of salinity, only the numbers of chironomids were negatively correlated with increased salinity. Nematode species diversity was low in all samples, although altogether 28 species were recorded in the samples. Four species occurred in more than 50% of the samples (Microlaimus sp. (100%), Metalinhomoeus sp. (76%), Daptonema sp.l (56%), Chromadorina sp. (56%)) while 12 species were found only in one or two samples. Multidimensional scaling ordination (MDS) of the nematode species abundance data indicated little effects of spring tide inundation on the assemblage structure, but rather a successive change from wet to dry season with a reduction in species diversity and increased numbers of the dominant nematode species Microlaimus sp.

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