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• W4255194159 abstract "ABSTRACT Tropical stream food webs are thought to be based primarily on terrestrial resources (leaf litter) in small forested headwater streams and algal resources in larger, wider streams. In tropical island streams, the dominant consumers are often omnivorous freshwater shrimps that consume algae, leaf litter, insects, and other shrimps. We used stable isotope analysis to examine (1) the relative importance of terrestrial and algal‐based food resources to shrimps and other consumers and determine (2) if the relative importance of these food resources changed along the stream continuum. We examined δ 15 N and δ 13 C signatures of leaves, algae, macrophytes, biofilm, insects, snails, fishes, and shrimps at three sites (300, 90, and 10 m elev.) along the Río Espíritu Santo, which drains the Caribbean National Forest, Puerto Rico. Isotope signatures of basal resources were distinct at all sites. Results of two‐source δ 13 C mixing models suggest that shrimps relied more on algal‐based carbon resources than terrestrially derived resources at all three sites along the continuum. This study supports other recent findings in tropical streams, demonstrating that algal‐based resources are very important to stream consumers, even in small forested headwater streams. This study also demonstrates the importance of doing assimilation‐based analysis (i.e. , stable isotope or trophic basis of production) when studying food webs." @default.
• W4255194159 created "2022-05-12" @default.
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• W4255194159 date "2003-03-01" @default.
• W4255194159 modified "2023-10-14" @default.
• W4255194159 title "Food Web Structure and Basal Resource Utilization along a Tropical Island Stream Continuum, Puerto Rico" @default.
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• W4255194159 doi "https://doi.org/10.1111/j.1744-7429.2003.tb00265.x" @default.
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