Potential Productivity of an Alpine Lake as Indicated by Removal and Reintroduction of Fish

Autor:	Carl J. Walters, Robert E. Vincent
Rok vydání:	1973
Předmět:	education.field_of_study Ecology fungi Population Zoology Aquatic Science Biology biology.organism_classification Zooplankton Predation Trout Productivity (ecology) Midge Periphyton education Ecology Evolution Behavior and Systematics Invertebrate
Zdroj:	Transactions of the American Fisheries Society. 102:675-697
ISSN:	1548-8659 0002-8487
DOI:	10.1577/1548-8659(1973)102<675:ppoaal>2.0.co;2
Popis:	Invertebrate population changes were traced during 1966–1968 in Emmaline Lake, Colorado, after removal in 1964 of a population of stunted brook trout. Species composition of the zooplankton changed greatly after fish removal; in the absence of fish predation, large species were dominant. Populations of mud dwelling midges increased after fish removal; in the absence of fish predation, population regulation appeared to occur through density-dependent larval mortality. Insect emergence over rocky areas was highest in the second summer after fish removal, following increases in periphyton production. In 1968, the lake was restocked with yearling cutthroat trout that fed primarily on midge pupae and Daphnia middendorffiana, and doubled in weight during the first summer in the lake. Growth efficiency of the trout was estimated to be 10–30%. Less than half of the daily ration was present in trout stomachs at any time, as judged from observed growth rate and potential growth efficiency. A computer simul...
Databáze:	OpenAIRE
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