Consequences of artificially opening coastal lagoons on their fish assemblages
Consequences of artificially opening coastal lagoons on their fish assemblages
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人工开放沿海泻湖对其鱼类群落的影响
DOI：
10.1007/bf02442117
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
S. Griffiths
中科院分区：
文献类型：
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作者：
S. Griffiths
人工开放泻湖入口的鱼组合在澳大利亚东南部沿海泻湖的后果进行了调查。泻湖开放的影响进行了评估，比较变化的鱼类组合的Werri和谢尔港泻湖，这两个间歇性地开放到海与伊拉瓦拉湖，第三沿海泻湖，在研究期间仍然关闭。鱼类物种和个体的数量没有显着差异后，在Werri泻湖和谢尔港泻湖泻湖开口。然而，在其他泻湖开放之前，在伊拉瓦拉湖发现了更多的物种和个体。一些具有经济意义的物种（即Mugil cephalus，Myxus elongatus和Liza argentea）的丰度在开放后显著增加，主要是由于小型幼鱼（<40 mm FL）补充到海草床。相比之下，这些物种在伊拉瓦拉湖被捕获为较大的幼鱼（>70毫米FL）。此外，伊拉瓦拉湖的鱼类丰度在连续几个月下降，与盐度下降相吻合。栖息物种（如Pseudomugil olorumandAfurcagobius tamarensis）的丰度在开放后基本保持不变。虽然海洋产卵物种显然必须受益于泻湖开口，但能够从邻近沃茨进入泻湖的物种的数量和组成可能取决于入口与海洋相连的频率、持续时间和一年中的时间。因此，本研究提供的数据可能对间歇性开放泻湖的渔业管理有用。然而，这些结果不应被作为人为打开泻湖入口的理由，因为还需要进一步详细研究泻湖生物群的其他方面，如无脊椎动物和鸟类动物群，以便为更广泛的管理框架提供充分的依据。
The consequences of artificially opening lagoon entrances on the fish assemblages of coastal lagoons in south-eastern Australia were investigated. Impacts of lagoon opening were assessed by comparing changes in the fish assemblages of Werri and Shellharbour Lagoons, both of which intermittently opened to the sea with that of Lake Illawarra, a third coastal lagoon which remained closed during the study period. Numbers of fish species and individuals did not differ significantly after lagoon openings at Werri Lagoon and Shellharbour Lagoon. However, higher numbers of species and individuals were found in Lake Illawarra before the other lagoons had opened. Abundances of some economically significant species (namelyMugil cephalus, Myxus elongatusandLiza argentea) significantly increased after openings, mainly due to small juveniles (<40 mm FL) recruiting to the seagrass beds. In contrast, these species were caught as larger juveniles (>70 mm FL) in Lake Illawarra. Furthermore, their abundance in Lake Illawarra declined during successive months, coinciding with declining salinity. Abundances of resident species (such asPseudomugil olorumandAfurcagobius tamarensis) remained largely unchanged after openings. Although it was clear that marine-spawning species must benefit from lagoon openings, the number and composition of species able to move into lagoons from adjacent waters may be dependent upon the frequency, duration and time of year that the entrance is connected to the sea. The present study thus provides data which may be useful for fisheries management in intermittently open lagoons. However, these results should not be cited as reason to artificially open lagoon entrances as further detailed studies of other aspects of lagoon biota, such as their invertebrate and avian faunas, are also needed to provide sufficient basis for broader management frameworks.