| 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. |
| Genre: | Article |
| ProdID: | 70006745 |
| Citation Author: | Chilton, E. W., II; Margraf, F. J. |
| Citation Contributing Office: | Upper Midwest Environmental Sciences Center |
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| Citation End Page: | 296 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Freshwater Ecology |
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| Citation Month: | JUN |
| Citation No Pagination: | |
| Citation Number Of Pages: | 8 |
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| Citation Phsyical Description: | 8 p. |
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| Citation Public Comments: | Abstract has subscript/superscript to be fixed |
| Citation Publisher: | Taylor & Francis |
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| Citation Search Results Text: | Effects of fish predation on invertebrates associated with a macrophyte in Lake Onalaska, Wisconsin; 1990; Article; Journal; Journal of Freshwater Ecology; Chilton, E. W., II; Margraf, F. J. |
| Citation Start Page: | 289 |
| Citation Volume: | 5 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Effects of fish predation on invertebrates associated with a macrophyte in Lake Onalaska, Wisconsin; 1990; Article; Journal; Journal of Freshwater Ecology; Chilton, E. W., II; Margraf, F. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1080/02705060.1990.9665242 |
| Date Other: | Sun, 1 Jan 2012 11:03 -0600 |
| Publisher: | Taylor & Francis |
