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首页> 外文期刊>Freshwater science >Secondary production of Chironomidae in a large eutrophic lake:implications for lake sturgeon production
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Secondary production of Chironomidae in a large eutrophic lake:implications for lake sturgeon production

机译：大型富营养化湖泊中ron科的二级生产：对st鱼生产的启示

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Most foodweb research in lentic systems has focused on pelagic primary (phytoplankton) and secondary (zooplankton) production as the primary energy sources for higher trophic-level production. Recent research has demonstrated that secondary production of benthic primary consumers can affect pelagic fish production and foodweb structure in lakes. We used the instantaneous growth method to calculate secondary production of chironomids in Lake Winnebago, Wisconsin (USA), where previous research has shown that lake sturgeon (Acipenser fulvescens) rely heavily on the benthos (chironomids) as a food source. We also used literature-derived data and the instantaneous growth method to calculate annual production of lake sturgeon to test whether chironomid production is sufficient to support the current lake sturgeon population in Lake Winnebago. We collected benthic samples with an Ekman grab at 4 profundal sites during ice-free conditions on 11 dates from spring 2008 through spring 2009. We measured instantaneous growth rates for 7 chironomid length classes at 5 thermal regimes in the laboratory. Mean annual density of Chironomidae was 2714 individuals/m~2, mean biomass was 2.75 g dry mass (DM)/m~2, and mean annual production of Chironomidae was 7.59 g DM m~(-2) y~(-1).Estimated annual production of lake sturgeon was 0.02 g DM m~(-2) y~(-1) in 2007. We concluded that in 2008-2009 chironomid secondary production was sufficient to support the lake sturgeon population in Lake Winnebago. The annual production rates for chironomids in Lake Winnebago are higher than rates in many other lakes in North America, presumably because of the eutrophic condition of Lake Winnebago.
机译：透镜系统的大多数食物网研究都集中在远洋初级（浮游植物）和次级（浮游植物）生产，作为高营养水平生产的主要能源。最近的研究表明，底栖初级消费者的次级生产可影响湖泊中上层鱼类的生产和食物网结构。我们使用瞬时生长方法来计算威斯康星州温尼巴哥湖（美国）的拟南芥的次级生产，先前的研究表明，st鱼（Acipenser fulvescens）在很大程度上依赖于底栖鱼类（chironomids）作为食物来源。我们还使用了源自文献的数据和瞬时增长方法来计算st鱼的年产量，以检验手足类动物的产量是否足以支持Winnebago湖目前的lake鱼种群。我们从2008年春季到2009年春季的11个日期，在无冰条件下的4个深部地点采集了底栖动物样本，并在实验室中测量了5种热工况下7种尺长的瞬时增长率。 Chironomidae的年平均密度为2714个/ m〜2，平均生物量为2.75 g干重（DM）/ m〜2，Chironomidae的年平均产量为7.59 g DM m〜（-2）y〜（-1） 。2007年估计湖st的年产量为0.02 g DM m〜（-2）y〜（-1）。我们得出的结论是，在2008-2009年，手足类次生产量足以支持温尼巴哥湖的湖st数量。温尼巴哥湖的尺虫的年生产率高于北美许多其他湖泊的年生产率，这可能是由于温尼巴哥湖的富营养化所致。

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