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首页> 外文期刊>American Zoologist >delta N-15 and delta C-13 measurements of Antarctic peninsula fauna:Trophic relationships and assimilation of benthic seaweeds
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delta N-15 and delta C-13 measurements of Antarctic peninsula fauna:Trophic relationships and assimilation of benthic seaweeds

机译：南极半岛动物区系的N-15和C-13增量测量：底栖海藻的营养关系和同化作用

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Measurements of delta C-13, delta N-15, and C/N for a variety of Antarctic peninsula fauna and flora were used to quantify the importance of benthic brown algae to resident organisms and determine food web relationships among this diverse littoral fauna. delta C-13 values ranged from -16.8 parts per thousand for benthic algal herbivores (limpets) to -29.8 parts per thousand for the krill, Euphausia superba; the average pooled value for brown macroalgae, including their attached filamentous diatoms, was-20.6 parts per thousand. There was no correlation between biomass delta C-13 or delta N-15 with ON content, and consequently both 6(13)C and delta N-15 values were useful in evaluating trophic relationships. delta N-15 values of the fauna ranged from 3.1 to 12.5 parts per thousand, with lowest values recorded in suspension feeders (e.g., bryozoans) and highest values in Adelie penguins (12.5 parts per thousand) collected in 1989. The comparatively lower delta N-15 value for a Chinstrap penguin (6.9 parts per thousand) collected in 1997 is attributed to the different dietary food sources consumed by these species as reflected in their respective delta C-13 values. Significant amounts of benthic macroalgal carbon Is incorporated into the tissues of invertebrates and fishes that occupy up to four trophic levels. For many benthic and epibenthic species, including various crustaceans and molluscs, assimilation of benthic algal carbon through detrital pathways ranges from 30 to 100%. Consequently, the trophic Importance of benthic brown algae may well extend to many pelagic organisms that are key prey species for birds, fishes, and marine mammals. These data support the hypothesis that benthic seaweeeds, together with their associated epiphytic diatoms, provide an important carbon source that is readily incorporated Into Antarctic peninsula food webs.
机译：测量了各种南极半岛动植物群的δC-13，δN-15和C / N，以量化底栖褐藻对居民生物的重要性，并确定这种多样的沿海动物之间的食物网关系。 C-13增量值范围从底栖藻类食草动物（帽贝）的千分之-16.8到磷虾Euphausia superba的千分之-29.8。棕色大型藻类（包括其附着的丝状硅藻）的平均合并值为20.6千分之几。生物量δC-13或δN-15与ON含量之间没有相关性，因此6（13）C和δN-15值都可用于评估营养关系。该动物区系的N-15值在3.1至1.25之间，每千份中有极低的值，在悬浮喂食器（例如，苔藓动物）中记录的最低值，在1989年收集的阿德利企鹅中则有最高值（12.5千分之一）。 1997年收集的Chinstrap企鹅（每千份中有6.9份）的-15值归因于这些物种消耗的不同饮食食物来源，如它们各自的C-13值所反映。大量底栖大型藻类碳被吸收到无脊椎动物和鱼类的组织中，它们占据了多达四个营养级。对于许多底栖和上栖物种，包括各种甲壳类和软体动物，通过碎屑途径对底栖藻类碳的吸收范围为30％至100％。因此，底栖褐藻的营养重要性很可能会扩展到许多远洋生物，这是鸟类，鱼类和海洋哺乳动物的主要猎物。这些数据支持这样的假设，即底栖海藻及其相关的附生硅藻提供了重要的碳源，可以很容易地将其掺入南极半岛的食物网中。

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