Macroinvertebrate prey availability and food web dynamics of nonnative trout in a Colorado River tributary, Grand Canyon

Autor:	Brian D. Healy, Daniel P. Whiting, Craig P. Paukert, Jonathan J. Spurgeon
Rok vydání:	2014
Předmět:	Canyon geography geography.geographical_feature_category Ecology biology Aquatic Science biology.organism_classification Food web Predation Fishery Trout Benthic zone Tributary Rainbow trout Ecology Evolution Behavior and Systematics Invertebrate
Zdroj:	Freshwater Science. 33:872-884
ISSN:	2161-9565 2161-9549
DOI:	10.1086/676915
Popis:	Nonnative fishes have been linked to the decline of native fishes and may affect aquatic food webs through direct and indirect pathways. These concerns have led to efforts to remove nonnative Brown and Rainbow Trout, which are abundant in tributaries of the Colorado River, to enhance native fish communities. We sampled fish, benthic, and drifting macroinvertebrates in November 2010, January 2011, June 2011, and September 2011 to assess resource availability and to evaluate the effects of nonnative Brown and Rainbow Trout in a tributary of the Colorado River in the Grand Canyon. We evaluated trout diets from stomach samples collected during macroinvertebrate sampling periods, and we estimated annual consumption with bioenergetics models. We used 13C and 15N stable isotopes to examine potential diet overlap between native and nonnative fishes. Contributions to benthic biomass varied among megalopterans (16–35%), trichopterans (19–28%), and ephemeropterans (9–32%), whereas ephemeropterans dominated b...
Databáze:	OpenAIRE
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