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Juvenile brown trout response to fine woody debris in experimental stream channels
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för miljö- och livsvetenskaper. (Naturresurs Rinnande Vatten)ORCID-id: 0000-0001-7160-1290
Karlstads universitet, Fakulteten för samhälls- och livsvetenskaper, Avdelningen för biologi.ORCID-id: 0000-0003-2220-1615
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Abstract [en]

Changes in riparian vegetation due to forest harvesting may affect the input of fine woody debris, an important structural element, to streams. Woody debris has been shown to benefit trout populations. In-stream fine woody debris (FWD) has not been studied as extensively as large woody debris, but is probably important to smaller-sized trout. In a laboratory stream experiment we tested young-of-the-year wild brown trout, Salmo trutta, responses to three densities of fine woody debris (FWD). The trout were tested as singletons and four together. Swimming activity increased with increasing fish density and decreasing FWD density. Foraging decreased and time spent in FWD increased with increasing FWD density. Aggressiveness was lowest in intermediate FWD density. Our study shows that FWD impact on trout is related to fish rank, fish density and FWD density, and that juvenile trout response to fine WD is different from the response to large WD reported by others.

Nyckelord [en]
fine woody debris, brown trout, juvenile, streams
Nationell ämneskategori
Naturvetenskap
Forskningsämne
Biologi
Identifikatorer
URN: urn:nbn:se:kau:diva-31671OAI: oai:DiVA.org:kau-31671DiVA, id: diva2:703935
Tillgänglig från: 2014-03-10 Skapad: 2014-03-10 Senast uppdaterad: 2017-12-06Bibliografiskt granskad
Ingår i avhandling
1. Effects of fine woody debris on juvenile brown trout (Salmo trutta) and drifting invertebrates
Öppna denna publikation i ny flik eller fönster >>Effects of fine woody debris on juvenile brown trout (Salmo trutta) and drifting invertebrates
2014 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In boreal forest streams, woody debris is an important habitat component. Stream invertebrates and salmonids such as brown trout benefit from in-stream wood. The studies presented in this thesis explore how drifting stream invertebrates respond to addition of fine woody debris, and how young-of-the-year (0+) brown trout behave in habitats with and without fine woody debris. The first paper reports results from a field experiment where fine woody debris was added to streams, and invertebrate drift was measured in order to detect impacts of the fine woody debris on drift density, biomass and taxon diversity. In the end of the season, the fine woody debris-affected drift samples showed higher density, biomass and taxon diversity than the control samples. In the second paper, I describe effects of fine woody debris on 0+ brown trout, studied in laboratory stream channels. Trout were tested in habitats without fine woody debris, with an intermediate fine woody debris density, and with a high fine woody debris density. Swimming activity and foraging time were significantly lower when fine woody debris was present than when it was absent. More time was spent sheltering at the high fine woody debris density than at the intermediate one. The increasing exploitation of fine woody debris for biofuel purposes should be considered in relation to the effects on brown trout and stream invertebrate habitat.

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstads universitet, 2014. s. 22
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2014:15
Nyckelord
brown trout, juvenile, stream, woody debris, invertebrates, fine woody debris
Nationell ämneskategori
Biologiska vetenskaper
Forskningsämne
Biologi
Identifikatorer
urn:nbn:se:kau:diva-31672 (URN)978-91-7063-545-8 (ISBN)
Presentation
2014-04-29, 11D227, Universitetsg 2, Karlstad, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

Artikel 1 ingick i avhandlingen som manuskript med titeln "Effects of fine wood addition on invertebrate drift in boreal forest streams". Nu publicerad.

Tillgänglig från: 2014-04-07 Skapad: 2014-03-10 Senast uppdaterad: 2020-06-18Bibliografiskt granskad

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Av författaren/redaktören
Enefalk, ÅsaBergman, Eva
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Institutionen för miljö- och livsvetenskaperAvdelningen för biologi
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