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首页> 外文期刊>Journal of the North American Benthological Society >Stream discharge and floodplain connections affect seston quality and stable isotopic signatures in a coastal plain stream
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Stream discharge and floodplain connections affect seston quality and stable isotopic signatures in a coastal plain stream

机译：溪流排放和洪泛区连接影响沿海平原溪流中的水质和稳定的同位素特征

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Connections of a stream to its floodplain are important ecological linkages that affect spatial and temporal dynamics of the basal resources available to primary consumers in streams. Suspended organic material and associated microorganisms (seston) vary in quality seasonally and interannually within streams because of changing inputs from riparian and floodplain sources. Researchers have investigated the quality of different size fractions of material, but these differences have not been assessed with respect to the hydrology and the geomorphic structure of streams. We investigated how quality, represented by the stoichiometric ratio C:N, and stable isotopic signature (δ~13C and δ~15N) of 3 seston size classes varied in Ichawaynochaway Creek, a 5th-order tributary of the lower Flint River in the Coastal Plain of southwestern Georgia, USA. Samples were collected throughout the basin during varying flow regimes to estimate the quality and source of materials available over different temporal and spatial scales. Our results indicate significant differences in quality and stable isotopic signature based on particle size, discharge, and geomorphic structure of the stream and floodplain (constrained vs unconstrained reaches). The constrained portions of this stream occur in the lower portions of the basin. During low flow conditions, seston had higher quality with less depleted 613C and more enriched 615N signatures in the constrained than in the unconstrained portions of the stream. However, during high flow conditions, higher quality seston entered the stream from the adjacent floodplain in all portions of the basin. Insights gained from our study indicate how terrestrial and aquatic linkages and the natural flow regime affect the dynamics of basal resources and their availability to primary consumers in streams.
机译：河流与其洪泛区之间的联系是重要的生态联系，影响河流中主要消费者可利用的基础资源的时空动态。由于河岸和洪泛区来源的投入物不断变化，河流中悬浮的有机物质和相关的微生物（seston）的质量在季节性和年度间有所不同。研究人员已经研究了不同大小的物料的质量，但是尚未就水文和溪流的地貌结构评估这些差异。我们调查了Ichawaynochaway Creek（沿海弗林特河下游的5阶支流）的3种尺寸大小的同位素（以化学计量比C：N和稳定的同位素特征（δ〜13C和δ〜15N）表示）的质量变化美国西南乔治亚平原。在不同的流态下，整个盆地都收集了样本，以估算不同时空尺度上可用物质的质量和来源。我们的结果表明，根据溪流和洪泛区的粒径，流量，地貌结构（受约束河段与不受约束河段），质量和稳定同位素特征存在显着差异。该水流的受约束部分出现在盆地的下部。在低流量条件下，与流的非约束部分相比，约束中的seston具有更高的质量，更少的613C损耗和615N签名更丰富。但是，在高流量条件下，更高质量的塞斯顿从盆地的所有部分中的相邻洪泛区进入河流。从我们的研究中得出的见解表明，陆地和水上的联系以及自然流态如何影响基础资源的动态及其对河流主要消费者的可利用性。

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