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Do intruding predators and trap position affect the reliability of catches in activity traps?
Department of Wildlife Ecology, Swedish University of Agricultural Sciences, Umeå. (Akvatisk biologi och kemi)
Department of Applied Ecology, University of Helsinki.
Finnish Game and Fisheries Research Institute, Evo Game Research Station.
Department of Wildlife Ecology, Swedish University of Agricultural Sciences, Umeå.
1992 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 239, no 3, 187-193 p.Article in journal (Refereed) Published
Abstract [en]

Forty lakes in Sweden and Finland were sampled in 1990 with activity traps to evaluate the effects of trapped predators on invertebrate catch. Vertebrate (fish, newts) and invertebrate (leeches, dragonflies, water beetles, backswimmers and water scorpions) predators were considered separately. Invertebrate predators affected neither the abundance nor the taxonomic diversity of the catches. Vertebrate predators had no effect on the abundance but reduced the taxonomic diversity of the catches significantly. Thus, vertebrate predators are a possible source of bias in activity trap catches, but oily concerning taxonomic diversity. Within the depth gradient studied (0.25-0.75 m), trap position (suspended in mid-water versus on the bottom) did not affect the percentages of nektonic and benthic invertebrates in the catches. The relative abundance of all taxa was similar in the catches from different trap positions, but the relative abundance of the most numerous taxa as well as the diversity of the catches differed between trap positions. We conclude that both mid-water and bottom traps are suitable for monitoring aquatic invertebrates, and that bottom traps may be preferred for practical reasons.

Place, publisher, year, edition, pages
1992. Vol. 239, no 3, 187-193 p.
Keyword [en]
ACTIVITY TRAPS, DUCK FOOD, PREDATION, TRAP POSITION, ABUNDANCE, HABITATS, SWEDEN, LAKES, SIZE, FOOD
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:hkr:diva-5407DOI: 10.1007/BF00007676ISI: A1992JN83900007ISBN: 0018-8158 (print)OAI: oai:DiVA.org:hkr-5407DiVA: diva2:320508
Available from: 2010-05-25 Created: 2009-12-07 Last updated: 2014-08-01Bibliographically approved

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Elmberg, Johan

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