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首页> 外文期刊>Hydrobiologia >Responses of plankton and fish communities to mass removal of planktivorous fish in a two-basin lake in southern Finland
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Responses of plankton and fish communities to mass removal of planktivorous fish in a two-basin lake in southern Finland

机译：芬兰南部两流域湖泊中浮游生物和鱼类群落对大规模去除浮游鱼类的反应

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摘要

Responses of plankton and fish communities to mass removal of cyprinid fishes were studied in a two-basin lake,Aimajarvi,in southern Finland during 1997-2001.Fish were removed from the lake with fyke nets and seining.By spring 2001,the cumulative catches were 276 kg ha~(-1) in the northern and 226 kg ha~(-1) in the southern basin.Roach dominated the catches of both basins.From summer 1997 to 2001 the total biomass of phytoplankton decreased from 10-30 to 5-13 mg l~(-1) in the more eutrophic northern basin and from 5-19 to 2-4 mg l~(-1) in the southern basin,respectively.The occurrence of maximum biomass of blue-green algae moved from July to August towards autumn during the study period.The mean biomass of cladoceran crustaceans in July to August showed a slightly increasing trend from 100-150 to 150-200 mug C L~(-1).The biomasses of Daphnia spp.and Bosmina coregoni were higher in 2000 and 2001 compared to earlier years.The annual mean total catches of multimesh gillnets,dominated by roach,were 3.9-5.1 kg net~(-1) in the northern and 1.8-2.6 kg net~(-1) in the southern basin.A slight decrease took place in the gillnet catches in the southern basin but not in the northern.The increased growth of young perch and roach in the last years of the study period was attributed to the thermal conditions rather than to the fish removal.
机译：在1997-2001年期间，在芬兰南部的艾马耶尔维（Aimajarvi）两盆湖中研究了浮游生物和鱼类群落对大规模清除鲤科鱼类的反应。用钓网和围网将鱼从湖中捞出。到2001年春季，累计捕捞量北部盆地为276 kg ha〜（-1），南部盆地为226 kg ha〜（-1）.1997年夏季至2001年，浮游生物的总生物量从10-30下降至226 kg ha〜（-1）。富营养化程度较高的北部盆地为5-13 mg l〜（-1），南部盆地为5-19至2-4 mg l〜（-1）。蓝藻最大生物量的发生移动了研究期间从七月到八月到秋季到秋季，锁骨甲壳类甲壳动物的平均生物量从100-150马克杯CL〜（-1）略有增加趋势。水蚤和波斯尼亚的生物量在2000年和2001年，coregoni比往年要高。 ach鱼，北部盆地的净含量为3.9-5.1 kg〜（-1），南部盆地的净含量为1.8-2.6 kg〜（-1）。南部盆地的刺网渔获量略有下降，而北部则没有在研究期的最后几年，幼鲈和蟑螂的生长增加归因于高温条件而不是鱼的去除。

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