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首页> 外文期刊>Estuarine Coastal and Shelf Science >Tight trophic association between benthic diatom blooms and shallow-water megabenthic communities in a rapidly deglaciated Antarctic fjord
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Tight trophic association between benthic diatom blooms and shallow-water megabenthic communities in a rapidly deglaciated Antarctic fjord

机译：急速南极冰河峡湾底栖硅藻水华与浅水大型底栖动物群落之间的紧密营养联系

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摘要

This study reports isotopic evidence of a unique and highly efficient trophic structure based on a rarely reported benthic diatom species in a rapidly warming Antarctic fjord (Marian Cove; MC). Recent surveys of MC revealed a very conspicuous feature, an intense, persistent benthic diatom bloom ('benthic diatom bush) overgrowing a variety of common megabenthic fauna, primarily filter feeders (bivalves, ascidians, and demosponges), which occurred widely at shallow depths. To ascertain if the benthic diatom bloom is consumed as a primary food source, delta C-13 and delta N-15 were analyzed in the associated filter feeders and other herbivores, as well as in the diatom bush and other potential food sources (microphytobenthos, sedimentary organic matter and macroalgae). The analysis showed that the delta C-13 values of all filter feeders (-23.5 to -25.2 parts per thousand) were very similar to those of the diatom bush (-23.1 to -23.6 parts per thousand), strongly suggesting that these benthic diatoms are the principal diet of the associated filter feeders. The isotopic signatures of the other food sources were very close to those of the diatom bush, indicating that the organic matter had the same origin, namely benthic diatoms. Given its quality, quantity and availability, the diatom bush could be regarded as the primary food source. The benthic diatom bush was predominated by the chain-forming centric diatom Paralia sp., which occurs in shallow coastal waters with a wide range of salinity in various geographic localities. Thus, the Paralia sp. bloom in this rapidly warming fjord also indicates its potential utility as an indicator of climate-induced environmental changes. Additional isotopic analysis of other common fauna showed that the benthic food web in this fjord comprised up to four trophic levels of consumers, with starfish and isopods at the apex. Given that filter feeders comprise the largest trophic group in the cove and many other Antarctic coastal waters, the results of this study strongly suggest that benthic diatoms are of prime importance in supporting the benthic food web in MC, and possibly other nearshore Antarctic waters. Further studies on the mechanism underlying benthic diatom blooms and their relevance to climate-induced processes would provide better project future scenarios for rapidly warming fjord ecosystems.
机译：这项研究报告了同位素的证据，该证据基于在快速升温的南极峡湾（Marian Cove； MC）中很少报道的底栖硅藻物种而建立的独特而高效的营养结构。最近对MC的调查显示出一个非常显着的特征，即强烈的，持续的底栖硅藻绽放（底栖硅藻灌木丛），生长在各种常见的大型底栖动物区系中，主要是滤食性动物（双壳类，海生动物和demo茎动物），广泛分布于浅层深度。为了确定底栖硅藻花是否被当作主要食物来源，在相关的滤食器和其他草食动物以及硅藻灌木丛和其他潜在食物来源（微型藻类，沉积有机质和大型藻类）。分析表明，所有滤嘴给料器的δC-13值（千分之-23.5至-25.2）与硅藻灌木丛的百分率C-13值（千分之-23.1至-23.6）非常有力地表明，这些底栖硅藻是相关过滤器喂食器的主要饮食。其他食物来源的同位素特征与硅藻丛的同位素特征非常接近，表明有机物质的来源相同，即底栖硅藻。鉴于其质量，数量和可获得性，硅藻灌木丛可被视为主要的食物来源。底栖硅藻灌木丛主要由成链的中心硅藻Paralia sp。形成，它发生在沿海浅水区，在不同的地理区域具有广泛的盐度。因此，Paralia sp。在这个迅速变暖的峡湾中的花朵还表明其潜在用途，可作为气候导致的环境变化的指标。对其他常见动物的同位素分析表明，该峡湾底栖食物网包括多达四个营养级别的消费者，顶点处有海星和等足动物。考虑到滤食性动物是海湾和许多其他南极沿海水域中最大的营养类群，这项研究的结果强烈表明，底栖硅藻对于支持MC以及可能的其他近岸南极水域的底栖食物网至关重要。对底栖硅藻开花的机理及其与气候诱发过程的相关性的进一步研究将为快速变暖的峡湾生态系统提供更好的未来方案。

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