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Effects of fish predation on invertebrates associated with a macrophyte in Lake Onalaska, Wisconsin

Journal of Freshwater Ecology

Abstract has subscript/superscript to be fixed
By:
and
DOI: 10.1080/02705060.1990.9665242

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Abstract

We tested the effects of fish predation on the macroinvertebrates associated with Vallisneria americana (Michx) by using enclosure/exclosure experiments in lake Onalaska, Wisconsin. Four treatments were used: open water (cageless) controls, cage-effect controls (partially enclosed cages), exclosures (all fish removed), and enclosures (cages stocked with a known density of bluegills Lepomis macrochirus, Rafinesque). Bluegill predation at the density tested (one 70 mm fish per 0.37m2) did not depress Vallisneria associated invertebrate density. Mean invertebrate abundance and biomass (number and dry weight of invertebrates per g dry plant weight) increased in both exclosures and enclosures relative to open water controls. The most likely explanation is that the cages excluded some vertebrate predator(s) from those two treatments and decreased predation pressure within the cages. Large invertebrates, such as Hyalella azteca, Enallagma sp., Gyraulus sp., and Physa sp., increased in abundance within cages, whereas, small invertebrates such as chironomid larvae decreased in abundance.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of fish predation on invertebrates associated with a macrophyte in Lake Onalaska, Wisconsin
Series title:
Journal of Freshwater Ecology
DOI:
10.1080/02705060.1990.9665242
Volume
5
Issue:
3
Year Published:
1990
Language:
English
Publisher:
Taylor & Francis
Publisher location:
Philadelphia, PA
Contributing office(s):
Upper Midwest Environmental Sciences Center
Description:
8 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Freshwater Ecology
First page:
289
Last page:
296
Country:
United States
State:
Wisconsin
Other Geospatial:
Lake Onalaska