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首页> 外文期刊>Polar biology >Trophic relationships in the nearshore zone of Martel Inlet (King George Island, Antarctica):δ~(13)C stable-isotope analysis
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Trophic relationships in the nearshore zone of Martel Inlet (King George Island, Antarctica):δ~(13)C stable-isotope analysis

机译：Martel入口（南极乔治王岛）近岸带的营养关系：δ〜（13）C稳定同位素分析

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Carbon isotopic composition was used to assess the linkage between three different potential sources of energy and the community in the shallow coastal zone of Martel Inlet. Stable δ~(13)C ratios ranged from ―28.7per thousand for the zooplankton plus phytoplankton to ―14.4per thousand for the grazer Nacella concinna. Microphytobenthos (―16.7per thousand) was considerably more enriched in ~(13)C than were suspended particulate matter (SPM) (―25.6per thousand) and macroalgal fragments (―23.6per thousand and ―21.1per thousand), indicating that stable carbon isotope analysis might be used to discern the relative contribution of these sources of primary production. There is a benthic-pelagic coupling between plankton, benthic suspensivores, the ophiuroid Ophionotus victoriae and the icefish Chaenocephalus aceratus. Benthic grazers such as N. concinna, deposit feeders such as Yoldia eightsi and the nematodes showed a tight coupling with the microphytobenthos and the sediment. Some omnivorous/depositivorous polychae-tes, echinoids, amphipods and the fish Notothenia coriiceps showed values close to the ratios of the macroalgal fragments. Benthic carnivores and/or scavengers were generally enriched over suspensivores and depleted in relation to microphytobenthos grazers, showing a considerable overlap in δ~(13)C values throughout the food web, without any clear coupling with the primary sources of organic matter. The trophic web in the shallow zone of high benthic production and under seasonal ice cover in the Antarctic is more complex than it is in shelf areas, where SPM is the main food source. The soft-bottom community in the shallow zone of Martel Inlet is enriched in ~(13)C due to the significant input of carbon from the microphytobenthos and macroalgal fragments.
机译：碳同位素组成用于评估三种不同的潜在能源与Martel Inlet浅海沿岸社区之间的联系。稳定的δ〜（13）C比范围从浮游动物和浮游植物的每千人28.7到放牧的Nacella concinna的每千人14.4的比率。微型底栖鱼类（〜16.7 /千）比悬浮颗粒物（SPM）（〜25.6 /千）和大型藻类碎片（〜23.6 /千和〜21.1 /千）富含〜（13）C，表明碳稳定同位素分析可用于识别这些主要生产来源的相对贡献。浮游生物，底栖悬垂体，蛇形Ophionotus victoriae和冰鱼Chaenocephalus aceratus之间存在底栖-上层耦合。底栖放牧者（例如N. continna），沉积物喂食器（例如Yoldia Augustsi和线虫）显示出与微植物底栖动物和沉积物的紧密结合。一些杂食性/沉积性多糖，类固醇，两栖动物和鱼类Notothenia coriiceps的值接近大型藻类碎片的比率。底栖食肉动物和/或清道夫通常在悬栖动物中富集，相对于微噬菌性食草动物而言，它们被消耗掉了，整个食物网中的δ〜（13）C值有相当大的重叠，而与主要有机物没有明显的耦合。与底栖动物为主要食物来源的架子地区相比，南极底栖生物高产区和季节性冰盖下的营养网要复杂得多。由于来自微植物底栖动物和大型藻类碎片的大量碳输入，Martel Inlet浅区的软底群落富含〜（13）C。

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