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Food selectivity of perch (Perca fluviatilis L. ) in acidified lakes on the west coast of Sweden

Abstract

The objective of the present paper was to examine presumed changes in the food composition of perch in lakes subjected to recent acidification, which emanates from sulfuric acid in the precipitation. The material analyzed (825 preserved specimens from 49 different lakes) was collected by the Fishery Board. These lakes represent a great variability in terms of pH. The perch were divided into four size groups and the stomach contents of each specimen was analyzed qualitatively and quantitatively. The results indicate that fish, which make up the bulk of food for adult perch, are replaced by various invertebrates at a decreasing pH. With a moderate decrease the water hog-louse (Asellus aquaticus) appears of major importance, whereas its place is taken by Corixa bugs in the most acidified lakes. These latter invertebrates are normally absent in the food of adult perch. Also, plankton accounts for a substantial share of the stomach contents. The reasons for these changes are manifold, but two factors are primarily discussed in this paper, viz. the effect of the acidification on the prey populations and the elimination of certain species by selective predation in a normal lake.
Authors:
Publication Date:
Jan 01, 1972
Product Type:
Book
Reference Number:
EDB-85-141621
Resource Relation:
Related Information: Information No. 17
Subject:
54 ENVIRONMENTAL SCIENCES; 63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; ACID RAIN; ENVIRONMENTAL EFFECTS; FISHES; FOOD; POPULATION DYNAMICS; LAKES; ACIDIFICATION; SULFURIC ACID; TOXICITY; CHEMICAL ANALYSIS; INVERTEBRATES; PH VALUE; PREDATOR-PREY INTERACTIONS; SWEDEN; ANIMALS; AQUATIC ORGANISMS; ATMOSPHERIC PRECIPITATIONS; EUROPE; HYDROGEN COMPOUNDS; INORGANIC ACIDS; RAIN; SCANDINAVIA; SURFACE WATERS; VERTEBRATES; WESTERN EUROPE; 520200* - Environment, Aquatic- Chemicals Monitoring & Transport- (-1989); 560305 - Chemicals Metabolism & Toxicology- Vertebrates- (-1987)
OSTI ID:
5447103
Country of Origin:
Sweden
Language:
Swedish
Submitting Site:
HEDB
Size:
Pages: 22
Announcement Date:

Citation Formats

Andersson, B. Food selectivity of perch (Perca fluviatilis L. ) in acidified lakes on the west coast of Sweden. Sweden: N. p., 1972. Web.
Andersson, B. Food selectivity of perch (Perca fluviatilis L. ) in acidified lakes on the west coast of Sweden. Sweden.
Andersson, B. 1972. "Food selectivity of perch (Perca fluviatilis L. ) in acidified lakes on the west coast of Sweden." Sweden.
@misc{etde_5447103,
title = {Food selectivity of perch (Perca fluviatilis L. ) in acidified lakes on the west coast of Sweden}
author = {Andersson, B}
abstractNote = {The objective of the present paper was to examine presumed changes in the food composition of perch in lakes subjected to recent acidification, which emanates from sulfuric acid in the precipitation. The material analyzed (825 preserved specimens from 49 different lakes) was collected by the Fishery Board. These lakes represent a great variability in terms of pH. The perch were divided into four size groups and the stomach contents of each specimen was analyzed qualitatively and quantitatively. The results indicate that fish, which make up the bulk of food for adult perch, are replaced by various invertebrates at a decreasing pH. With a moderate decrease the water hog-louse (Asellus aquaticus) appears of major importance, whereas its place is taken by Corixa bugs in the most acidified lakes. These latter invertebrates are normally absent in the food of adult perch. Also, plankton accounts for a substantial share of the stomach contents. The reasons for these changes are manifold, but two factors are primarily discussed in this paper, viz. the effect of the acidification on the prey populations and the elimination of certain species by selective predation in a normal lake.}
place = {Sweden}
year = {1972}
month = {Jan}
}