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首页> 外文期刊>Marine ecology progress series >Benthic nutrient fluxes along an estuarine gradient: influence of the pinnid bivalve Atrina zelandica in summer
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Benthic nutrient fluxes along an estuarine gradient: influence of the pinnid bivalve Atrina zelandica in summer

机译：沿河口梯度的底栖养分通量：夏季双壳类双壳动物Atrina zelandica的影响

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Benthic nutrient fluxes (BNF) can supply 30 to 100% of the nutrient requirements of benthic and pelagic algae in an estuary, and can, thus, potentially sustain benthic and pelagic primary production within the estuarine food web. While BNF can be influenced by microbial processes, epibenthic suspension-feeding bivalves have the potential to alter fluxes by their influence on the community composition of surrounding macrofauna and benthic boundary conditions, and their feeding activities. In Mahurangi Harbour, New Zealand, the large suspension feeding pinnid Atrina zelandica (hereafter referred to as Atrina) occupies large areas of the harbour floor. Consequently, Atrina have the potential to substantially influence the BNF and, thus, primary production, and the food supply to the filter feeding community within the harbour, including the rack-farmed Pacific oyster aquaculture industry. Mahurangi Harbour is almost always isohaline, but exhibits a strong gradient in suspended sediment concentration, which declines from head to mouth. As Atrina increase their rate of pseudofaeces production with increases in suspended sediment concentration, we conducted in situ light and dark paired benthic chamber experiments with and without Atrina at 4 stations along this turbidity gradient, to determine their effect on BNF. Our results showed substantially greater BNF from Atrina beds than bare sediments. We also found greater net BNF (difference between Atrina beds and bare sediment) in the less turbid water under dark conditions, but enhanced water column nutrient supply in the more turbid water in light, due to Atrina excretion of ammoniacal nitrogen (NH_4-N). On an areal basis, we estimate that BNF from Atrina beds may account for up to 80% of the nutrient supply for pelagic primary production and, thus, they are of major importance to the sustainability of aquaculture in this harbour.
机译：底栖营养通量（BNF）可以满足河口底栖和浮游藻类营养需求的30％到100％，因此可以潜在地维持河口食物网中的底栖和浮游初级生产。虽然BNF可能受到微生物过程的影响，但表皮混养双壳类动物可能会通过影响周围大型动物群落和底栖边界条件以及它们的摄食活动而改变通量。在新西兰的马哈朗吉港，喂食pinnid Atrina zelandica（以下称为Atrina）的大型悬浮物占据了海底的大部分区域。因此，Atrina有可能对BNF产生重大影响，从而对初级生产产生重大影响，并有可能影响到港口内包括棚架养殖的太平洋牡蛎养殖业在内的过滤食户的食物供应。 Mahurangi港几乎总是等咸，但悬浮泥沙浓度表现出很强的梯度，从头到尾下降。随着Atrina随着悬浮沉积物浓度的增加而增加其假粪便的产生率，我们在沿该浊度梯度的4个站点进行了有无Atrina的原位明暗配对底栖室实验，以确定它们对BNF的影响。我们的结果表明，Atrina河床的BNF比裸露的沉积物大得多。我们还发现，在黑暗条件下，浊度较小的水中的净BNF（Atrina床层与裸露的沉积物之间的差异）更大，但由于浊度较高的Atrina排泄了氨氮（NH_4-N），因此在浊度较高的水中，水柱养分供应增加。 。从面积上看，我们估计来自Atrina床的BNF可能占中上层初级生产养分供应量的80％，因此，它们对该港口水产养殖业的可持续性至关重要。

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