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Effekter av dammutrivning på makroevertebrater och abiotiska förhållanden i svenska vattendrag
Karlstad University, Faculty of Health, Science and Technology (starting 2013).
2019 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Effects of dam removal on macroinvertebrates and abiotic conditions in Swedish streams (English)
Abstract [sv]

Rivning av dammar ökar globalt och fortsatta ökningar kan förväntas i framtiden. Trots det så är det fortfarande svårt att veta vilka effekter det kommer att få. Det gör det mycket viktigt att förstå hur organismer reagerar på borttagandet av en damm samt vilka faktorer som kontrollerar deras reaktion. Andra studier har visat på varierande resultat så syftet med den här studien att jämföra förändringar i total abundans, EPT, biodiversitet samt jämnhet (evenness) hos makroevertebrater i Nianån före och efter en dammutrivning, samt jämföra med ett kontrollvattendrag där ingen åtgärd gjorts. Provtagning skedde i tre lokaler som delades in i sex transekter vardera. Vid varje transekt mättes vattenhastighet, djup, substrattäckning och vid tre av transekterna samlades bentisk fauna in med sparkprover. Proverna nycklades till familjenivå och data analyserades. Resultatet visar inga signifikanta skillnader hos makroevertebrater gällande total abundans, EPT täthet, biodiversitet eller jämnhet före och efter att dammen revs, stora variationer i makroevertebrats index. Den fysisk livsmiljön såg förändringar före och efter avlägsnandet av dammen men förändringar hos makroevertebrater kan förväntas ske efter en längre tid.  Studier som denna är viktiga för att få ökad kunskap om effekterna av dammutrivningar på makroevertebrater och bidra som kunskapsunderlag vid förlag till avlägsnande av dammar.

Abstract [en]

Removal of dams in regulated rivers to restore natural flow regimes is increasing globally, and further increases can be expected in the future. Even so, it is difficult to quantify the biotic and abiotic effects of dam removal. That makes it very important to understand how organisms react to the removal of a dam and the factors that control their reaction. Previous  studies have yielded varying results, so the purpose of this study is to: 1) compare changes in total abundance, Ephemeroptera, Plecoptera, and Tricoptera (EPT), biodiversity and evenness of macrovertebrates in River Nianån, Sweden, before and after a dam removal, and 2) to compare it with a control stream where no action has been taken. Sampling took place at three locations each in the treatment and control streams, each divided into six transects. At each transect, water velocity, depth and substrate coverage were measured; in three of the transects, benthic fauna was collected by standardized kick samplimg. Macroinvertebrates were keyed to the family level and the data where analyzed. The result shows no significant differences in macroinvertebrates regarding total abundance, EPT density, biodiversity or evenness before and after the dam removal, high variability in macroinvertebrate indices. Physical habitat was found to differ before and after dam removal, however, so changes in macroinvertebrate indices might be expected over longer time scales. Studies like this are important for gaining increased knowledge of the effects of dam removal on macrovertebrates and as a basis for knowledge when considering a dam removal.

Place, publisher, year, edition, pages
2019. , p. 21
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:kau:diva-72637OAI: oai:DiVA.org:kau-72637DiVA, id: diva2:1326184
Subject / course
Biology
Educational program
Biology programme, 180 hp
Supervisors
Examiners
Available from: 2019-06-24 Created: 2019-06-17 Last updated: 2019-06-24Bibliographically approved

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Näsman, Svante
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CiteExportLink to record
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