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Linking Intertidal and Subtidal Food Webs: Consumer-Mediated Transport of Intertidal Benthic Microalgal Carbon

机译：链接潮间带和潮间带食物网：潮间底栖微藻碳的消费者介导运输

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摘要

We examined stable carbon and nitrogen isotope ratios for a large variety of consumers in intertidal and subtidal habitats, and their potential primary food sources [i.e., microphytobenthos (MPB), phytoplankton, and Phragmites australis] in a coastal bay system, Yeoja Bay of Korea, to test the hypothesis that the transfer of intertidal MPB-derived organic carbon to the subtidal food web can be mediated by motile consumers. Compared to a narrow δ13C range (−18 to −16‰) of offshore consumers, a broad δ13C range (−18 to −12‰) of both intertidal and subtidal consumers indicated that 13C-enriched sources of organic matter are an important trophic source to coastal consumers. In the intertidal areas, δ13C of most consumers overlapped with or was 13C-enriched relative to MPB. Despite the scarcity of MPB in the subtidal, highly motile consumers in subtidal habitat had nearly identical δ13C range with many intertidal foragers (including crustaceans and fish), overlapping with the range of MPB. In contrast, δ13C values of many sedentary benthic invertebrates in the subtidal areas were similar to those of offshore consumers and more 13C-depleted than motile foragers, indicating high dependence on phytoplankton-derived carbon. The isotopic mixing model calculation confirms that the majority of motile consumers and also some of subtidal sedentary ones depend on intertidal MPB for more than a half of their tissue carbon. Finally, although further quantitative estimates are needed, these results suggest that direct foraging by motile consumers on intertidal areas, and thereby biological transport of MPB-derived organic carbon to the subtidal areas, may provide important trophic connection between intertidal production and the nearshore shallow subtidal food webs.
机译：我们研究了潮间带和潮间带生境中各种消费者的稳定碳氮同位素比，以及他们在韩国Yeoja湾沿岸海湾系统中潜在的主要食物来源（例如，微底栖动物（MPB），浮游植物和南方芦苇）。 ，以检验一种假设，即潮汐性MPB衍生的有机碳向潮汐食物网的转移可以由运动消费者介导。与离岸消费者的δ 13 C窄范围（−18至-16‰）相比，两者的δ 13 C宽范围（−18至-12‰）潮间带和潮下带消费者表示，富含 13 C的有机物来源是沿海消费者的重要营养来源。在潮间带地区，大多数消费者的δ 13 C相对于MPB重叠或 13 C丰富。尽管潮间带缺少MPB，但潮间带高活动性消费者的δ 13 C范围几乎相同，且潮间带觅食者（包括甲壳类和鱼类）与MPB的范围重叠。相比之下，潮下带许多久坐的底栖无脊椎动物的δ 13 C值与离岸消费者相似，并且 13 C耗竭的多于活动觅食者，表明其依赖性强在浮游植物衍生的碳上。同位素混合模型的计算证实，大多数运动消费者以及潮间带久坐的消费者中，一半以上的组织碳依赖于潮间MPB。最后，尽管需要进一步的定量估计，但这些结果表明，运动消费者在潮间带进行直接觅食，从而将MPB衍生的有机碳生物运输到潮间带，可能在潮间带生产和近岸浅潮带之间提供重要的营养联系。食物网。

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