Stream foodweb &dgr;13C and geomorphology are tightly coupled in mountain drainages of northern Idaho
Stream foodweb &dgr;13C and geomorphology are tightly coupled in mountain drainages of northern Idaho
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流媒体食物网
DOI：
10.1899/12-101.1
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. Sulliván
中科院分区：
文献类型：
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作者：
S. Sulliván
抽象的。景观与当地流程的相对影响流C和能源的变化，以lotic消费者仍然没有得到解决，但通过流食物网的理解途径的一个关键组成部分。我调查了13 C签名的初级生产者（附着生物），陆地有机物（碎屑），和二级消费者（水生无脊椎动物和鱼类）的分布之间的潜在联系：1）流域面积和2）流达到地貌在北方爱达荷州，美国的3个山区流域。单独考虑时，排水面积解释的变化，在13 C签名的附着生物（R2 = 0.30）和杜父鱼（R2 = 0.15）。 随后的一般线性模型（GLM）表明，流形态解释显着变化的13 C的附着生物（79%），双翅目（93%），杜父鱼（51%），鳟鱼（63%）。在这些模型中，流域面积并不显着，结果表明，一旦13 C签名被解释为地貌类型的函数，流域面积的贡献变得不那么重要。总的来说，消费者13 C签名相关更强烈的附着生物13 C比碎屑13 C，虽然这种关系的地貌类型之间的变化。总的来说，结果表明，河流河段的形态（包括基质大小和存储元素，洪泛区发展等因素）。可能是一个重要的因素，在森林山溪食物网中的C的同化和分配。
Abstract. The relative influence of landscape vs local processes on variation in stream C and energy sources to lotic consumers remains unresolved, but is a key component in understanding pathways through stream food webs. I investigated potential linkages between the distribution of &dgr;13C signatures of primary producers (periphyton), terrestrial organic matter (detritus), and secondary consumers (aquatic invertebrates and fish) and: 1) drainage area and 2) stream reach geomorphology in 3 mountain watersheds of northern Idaho, USA. When considered alone, drainage area explained variation in the &dgr;13C signatures of periphyton (R2 = 0.30) and sculpin (R2 = 0.15) only. Subsequent General Linear Models (GLMs) showed that stream morphology explained significant variation in &dgr;13C of periphyton (79%), Diptera (93%), sculpin (51%), and trout (63%). Drainage area was not significant in these models, a result indicating that once &dgr;13C signatures are explained as a function of geomorphic type, the contribution of drainage area becomes less important. On the whole, consumer &dgr;13C signatures related more strongly to periphyton &dgr;13C than detrital &dgr;13C, though this relationship varied among geomorphic types. Collectively, results indicate that the morphology of a stream reach (including factors such as substrate size and storage elements, floodplain development, etc.) may be an important factor in the assimilation and distribution of C in food webs in forested mountain streams.