Importance of Vascular Plant and Algal Production to Macro-invertebrate Consumers in a Southern California Salt Marsh
Importance of Vascular Plant and Algal Production to Macro-invertebrate Consumers in a Southern California Salt Marsh
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维管束植物和藻类生产对南加州盐沼大型无脊椎动物消费者的重要性
DOI：
10.1006/ecss.1997.0254
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发表时间：
1997
影响因子：
2.8
通讯作者：
H. Page
中科院分区：
文献类型：
--
作者：
H. Page
摘要在南加州Carpinteria盐沼，利用稳定的碳、氮同位素比率，研究了沼泽维管束植物(主要是海蓬子)、藻类和陆地颗粒对大型无脊椎动物消费者的饮食重要性。这片沼泽主要是海洋或高盐度系统，肉质植物是最常见的维管束植物种类。在植被繁茂的沼泽、潮滩和航道中采集的无脊椎动物中，只有植被湿地的有害动物(Traskorchstia traskiana，Melampus olivaceus)的同位素值(δ13C=−20‰)表明可能使用了盐角藻来源的碳。在实验室培养的分解维吉尼亚链霉菌或蓝绿色微藻垫上培养的T.traskiana具有明显的同位素特征，反映了该消费者同化来自这些来源的碳和氮的能力。潮滩和航道中物种的δ13C值(一般为−16‰至−15‰)与底栖藻类和浮游植物的值最接近。沿假定海洋影响增加的梯度的高山沼虾标本具有相似的同位素值，表明旱地径流对食物的贡献很小。目前的结果与公开发表的悬浮摄食者13C富集值最显著不同，这表明这些消费者在潮汐水道中使用再悬浮的富含13C的底栖微藻，并在部分沼泽边界的植物和消费者接受营养丰富的栖息地下水输入时使用13C耗竭和15N富集量。总体而言，大型无脊椎动物的同位素组成表明，沼泽食物网中并入的是藻类生产，而不是维吉尼亚螺旋藻或高地来源。
Abstract The dietary importance of marsh vascular plants (primarily Salicornia virginica ), algae and upland particulate inputs to macro-invertebrate consumers was studied in Carpinteria Salt Marsh, southern California, using stable carbon and nitrogen isotope ratios. This marsh is predominantly a marine or hypersaline system and succulents are the most common vascular plant species. Of invertebrates collected from the vegetated marsh, tidal flats and channels, only detritivores from the vegetated marsh ( Traskorchestia traskiana , Melampus olivaceus ) had isotope values (δ 13 C=−20‰) that suggested some use of Salicornia -derived carbon. T. traskiana cultured in the laboratory on decomposing S. virginica or blue-green micro-algal mat had distinctive isotopic signatures, reflecting the capability of this consumer to assimilate carbon and nitrogen derived from these sources. The δ 13 C values (generally −16‰ to −15‰) of species from tidal flats and channels (e.g. Cerithidea californica , Protothaca staminea , Mytilus galloprovincialis , Neotrypaea californiensis ) were most similar to values for benthic algae and phytoplankton. Specimens of M. galloprovincialis along a gradient of presumed increase in marine influence had similar isotope values, suggesting little contribution to diet from upland runoff. The present results differ most noticeably from published values in the 13 C enrichment of suspension-feeders, suggesting the use of resuspended 13 C-enriched benthic microalgae in tidal channels by these consumers, and in the 13 C depletion and 15 N enrichment of plants and consumers along a portion of the marsh boundary receiving inputs of nutrient-enriched perched groundwater. In general, the isotopic composition of macro-invertebrates indicated the incorporation of algal production rather than of S. virginica or upland sources into the marsh food web.