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首页> 外文期刊>Estuarine Coastal and Shelf Science >Spatial and seasonal variations of fish assemblages in mangrove creek systems in Zanzibar (Tanzania)
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Spatial and seasonal variations of fish assemblages in mangrove creek systems in Zanzibar (Tanzania)

机译：桑给巴尔（坦桑尼亚）的红树林河系中鱼类种群的时空变化

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摘要

Spatial and seasonal variations of fish assemblage composition were studied in three non-estuarine mangrove creeks of Zanzibar (Tanzania). Fish were collected monthly for one year at three sites (lower, intermediate and upper reaches) in each creek using a seine net (each haul covering 170 m~2). Density, species number and diversity of fish were all higher at sites with dense cover of macrophytes (seagrass and macroalgae) than over unvegetated sandy sites. In general, fish assemblages mainly comprised juveniles of a few abundant taxa, e.g. Mugil cephalus, Mugilidae spp. and Leiognathus equulus at sites with mud substratum and Genes oyena, Lethrinus harak and Sillago sihama at sites dominated by macrophytes. Multivariate analyses revealed significant separations in fish assemblage composition within the two creeks where the bottom substratum differed among sites. Overall, season seemed to have little effect on density, species number, diversity index (H') and assemblage structure of fish. Water condition variables were also relatively stable across the season, although a short-term fluctuation primarily induced by decreased salinity, occurred during the heavy rains in April and May. Fish assemblage structure was not significantly affected by any of the abiotic factors tested. However, significant regressions were found between the other fish variables and environmental variables, but since these associations were mostly species-specific and generally inconsistent, we suggest that the overall distribution patterns of fish were mainly an effect of particular substrate preferences of fish species rather than contemporary water conditions.
机译：在桑给巴尔（坦桑尼亚）的三个非河口红树林小溪中研究了鱼类组合组成的时空变化。使用围网在每个小河的三个地点（下游，中游和上游）每月采集鱼，为期一年，每网覆盖170 m〜2。在密集的大型植物（海草和大型藻类）覆盖区，鱼类的密度，种类数量和多样性均高于无植被的沙质区。一般而言，鱼群主要由一些丰富的类群的幼体组成，例如头尾（Mugilidae spp。）在带有泥质基质的站点上有Leiognathus equulus，在大型植物为主的站点上有oyena，Lethrinus harak和Sillago sihama基因。多变量分析显示，在两个小溪中，底部底层之间的位置不同，这两个小溪中的鱼类组合组成明显分离。总体而言，季节似乎对鱼类的密度，物种数量，多样性指数（H'）和鱼类的组装结构影响很小。尽管主要由盐度降低引起的短期波动发生在4月和5月的大雨期间，但整个季节的水况变量也相对稳定。鱼群的结构不受任何非生物因素的影响。但是，在其他鱼类变量和环境变量之间发现了显着的回归，但是由于这些关联主要是特定于物种的，并且通常不一致，因此我们建议鱼类的总体分布模式主要是特定物种对鱼类底物偏好的影响，而不是当代水环境。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第4期|p.277-286|共10页
  • 作者

    Augustine W. Mwandya; Martin Gullstroem; Mathias H. Andersson; Marcus C. OEhman; Yunus D. Mgaya; Ian Bryceson;

  • 作者单位

    Department of Animal Sciences and Production, Sokoine University of Agriculture, Box 3004 Morogoro, Tanzania Department of Zoology, Stockholm University, S-106 91 Stockholm, Sweden;

    rnDepartment of Zoology, Stockholm University, S-106 91 Stockholm, Sweden Department of Systems Ecology, Stockholm University, S-106 91 Stockholm, Sweden Department of Marine Ecology, University of Gothenburg, The Sven Loven Centre for Marine Sciences, Kristineberg, S-450 34, Fiskebaeckskil, Sweden;

    rnDepartment of Zoology, Stockholm University, S-106 91 Stockholm, Sweden;

    rnDepartment of Zoology, Stockholm University, S-106 91 Stockholm, Sweden;

    rnDepartment of Aquatic Sciences and Fisheries, University of Dar es Salaam, Box 60091 Dar es Salaam, Tanzania;

    rnDepartment of International Environment and Development Studies, Norwegian University of Life Sciences, P.O. Box 5003,1432 As, Norway;

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  • 正文语种 eng
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  • 关键词

    mangrove creeks; fish communities; non-estuarine; substratum heterogeneity; East Africa;

    机译：红树林溪鱼类群落;非河口基质异质性东非;

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