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首页> 外文期刊>Journal of great lakes research >Mussel-derived stimulation of benthic filamentous algae: The importance of nutrients and spatial scale
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Mussel-derived stimulation of benthic filamentous algae: The importance of nutrients and spatial scale

机译：贻贝对底栖丝状藻类的刺激：营养物质和空间尺度的重要性

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摘要

The reoccurrence of benthic filamentous algal (FA) blooms in the Great Lakes, without associated increases in phosphorus loading, has stimulated renewed interest in determining the causes of Great Lakes benthic algal blooms. We investigated the potential roles of invasive mussels and nutrient limitation with experimental substrata within inner Saginaw Bay. FA abundance on live mussel substrata was typically significantly greater than that on inert (empty shell or rock) substrata. Nutrient addition (from an artificial source) significantly increased FA abundance on inert substrata. These results suggest that: 1) mussel nutrient excretion could be a primary stimulatory mechanism; 2) mussel-mediated stimulation may be even stronger in other, more oligotrophic, Great Lakes nearshore zones; and 3) increased nutrient loading to inner Saginaw Bay may exacerbate existing FA blooms. FA abundance on inert substrata was not affected, even in close proximity to mussels, indicating that the observed stimulatory effect of mussel-derived P on live mussels attenuated at very small spatial scales, on the order of centimeters or less. (C) 2016 International Association for Great Lakes Research. Published by Elsevier B.V. All rights reserved.
机译：大湖中底栖丝状藻（FA）水华的再次发生，而磷含量却没有增加，激发了人们重新确定大湖底栖藻水华的原因的兴趣。我们调查了萨吉诺湾内部实验基质对侵袭性贻贝和营养限制的潜在作用。活贻贝基质上的FA丰度通常显着大于惰性（空壳或岩石）基质上的FA丰度。添加营养（来自人工来源）可显着增加惰性基质中FA的丰度。这些结果表明：1）贻贝营养物质的排泄可能是主要的刺激机制。 2）贻贝介导的刺激作用在其他营养较弱的大湖近岸地区可能更为强烈； 3）萨吉诺湾内部的营养物负荷增加可能会加剧现有的FA爆发。即使在接近贻贝的地方，FA对惰性基质的丰度也没有受到影响，这表明观察到的贻贝衍生的P对活贻贝的刺激作用在很小的空间尺度（厘米或以下）上减弱。 （C）2016年国际大湖研究协会。由Elsevier B.V.发布。保留所有权利。

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