Notes on the Distribution and Feeding Ecology of a Relict Population of the Cardinal Shiner,<i>Luxilus cardinalis</i>(Teleostei: Cyprinidae), in Kansas

Alexander, Amanda M.; Perkin, Joshuah S.

doi:10.1660/062.116.0103

Cited by 1 publication

(1 citation statement)

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“…September 2018 | 625 from the gut tract of fishes (Alexander and Perkin 2013). Furthermore, using fish diets to assess insect assemblage diversity might be confounded by prey selectivity of the focal fish (Goldstein and Meador 2004).…”

Section: Volume 37mentioning

confidence: 99%

The river continuum concept predicts prey assemblage structure for an insectivorous fish along a temperate riverscape

Curtis¹,

Gebhard²,

Perkin³

2018

Freshwater Science

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The river continuum concept (RCC) provides a framework for processes structuring lotic ecosystems by synthesizing sources and transport of C in streams. Considerable attention, refinement, and testing of the RCC has occurred since its inception >35 y ago, but few investigators have tested its predictions by explicitly linking consumer groups. We assessed insect assemblage structure in the diet of a broadly distributed insectivorous fish (Cottus carolinae) in the Roaring River continuum of Tennessee to test 3 predictions from the RCC: 1) longitudinal change in relative biomass of insect functional feeding groups (FFGs) including decrease for shredders, increase for collectors, intermediate maximum for grazers, and consistency for predators; 2) maximum taxonomic diversity at stream orders 3 to 5; and 3) temporal turnover in taxonomic composition across 1 y. We found that relative biomass of insect FFGs consumed by C. carolinae broadly matched predictions from the RCC. Maximum taxonomic diversity assessed at the family rank occurred at stream order 4 where diel and annual water temperature fluctuations were greatest, and monthly prey assemblages followed a sequence of turnover and a return to starting conditions across 1 y. Our novel approach illustrates proof of concept that RCC tenets are integrated into the diet of at least 1 higher-level consumer and, therefore, transcend assemblage boundaries in regulating the longitudinal (up-to downstream) and vertical (multiple consumer groups) flow of C in streams.

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Section: Volume 37mentioning

confidence: 99%