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Effekt av fin ved (Salix sp.) på drift i semi-naturliga bäckar
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
2015 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Effect of fine wood (Salix sp.) on drift in semi-natural streams (English)
Abstract [en]

In streams, wood provides protection, food and substrate for benthic macroinvertebrates, which leads a higher density and diversity of the benthic fauna compared to streams without wood. To examine wood and its effect on drift of macroinvertebrates an experiment was done in 18 sections of six semi-natural streams where fine woody debris (Salix sp.) was added to half of the sections (1-2 per stream). The purpose was to investigate possible differences in density and diversity of macroinvertebrates aswell as to investigate if there was any effect of location, upstream or downstream, in the streams. The results showed no significant effect of woody debris on total drift. The lack of an effect is probably related to the high abundance of predators (fish, brown trout) and the time of the day when the samples were taken. There was a significant effect of time on total drift; with more drift in September than in October. An effect of time was also found for the taxon Diptera (Chironomidae not included), with drift decreasing with temperature over the season.

Abstract [sv]

Ved i ett vattendrag ger skydd, föda och substrat åt bentiska makroevertebrater, vilket leder till en högre täthet och diversitet av makroevertebrater än i vattendrag utan ved. För att undersöka vedens inverkan på makroevertebraternas drift utfördes ett experiment i sammanlagt 18 inhägnader i semi-naturliga bäckar där hälften av inhägnaderna behandlades med fin ved (Salix sp.). Syftet var att undersöka eventuella skillnader i täthet och diversitet av makroevertebrater samt om det fanns en skillnad i läge, uppströms och nedströms i bäckarna. Resultatet visade ingen signifikant effekt av ved med avseende på den totala driften. Det fanns heller ingen signifikant effekt av ved på tätheten i enskilda på ved än utan. De bakomliggande faktorerna till varför ingen signifikant effekt av ved visades är troligtvis den höga tätheten av predatorer (öring) och tidpunkten då proverna togs. Det fanns dock en signifikant effekt av tid gällande den totala driften, i september var det mer drift än i oktober. Det fanns även en signifikant effekt av tiden på Diptera (alla Diptera taxa förutom Chironomidae). Detta tros vara på grund av den sjunkande temperaturen mellan månaderna.

Place, publisher, year, edition, pages
2015. , 12 p.
Keyword [en]
Benthos, brown trout, fresh water stream, macroinvertebrates
Keyword [sv]
Bentos, öring, rinnande vatten, makroevertebrater
National Category
Biological Sciences
URN: urn:nbn:se:kau:diva-37836OAI: diva2:851159
Subject / course
Educational program
Biology programme, 180 hp
Available from: 2015-09-10 Created: 2015-09-03 Last updated: 2015-09-10Bibliographically approved

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