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A test for suitable fish hosts for the threatened freshwater pearl mussel (Margaritifera margaritifera) prior to reintroduction
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för miljö- och livsvetenskaper (from 2013). (River Ecology and Management group)
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för miljö- och livsvetenskaper (from 2013). (River Ecology and Management group)ORCID-id: 0000-0002-8738-8815
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för miljö- och livsvetenskaper (from 2013). (River Ecology and Management group)ORCID-id: 0000-0001-6758-5857
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Nyckelord [en]
Unionoid mussels, infestation, encystment, glochidia, brown trout
Nationell ämneskategori
Ekologi
Forskningsämne
Biologi
Identifikatorer
URN: urn:nbn:se:kau:diva-65013OAI: oai:DiVA.org:kau-65013DiVA, id: diva2:1153322
Tillgänglig från: 2017-10-30 Skapad: 2017-10-30 Senast uppdaterad: 2018-06-27Bibliografiskt granskad
Ingår i avhandling
1. Habitat compensation in nature-like fishways: Effects on benthos and fish
Öppna denna publikation i ny flik eller fönster >>Habitat compensation in nature-like fishways: Effects on benthos and fish
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The construction of nature-like fishways has become an increasingly common measure to restore longitudinal connectivity in streams and rivers affected by hydroelectric development. These fishways also have the potential to function as habitat compensation measures when running waters have been degraded or lost. The habitat potential has however often been overlooked, and therefore the aim of this thesis was to examine the potential of nature-like fishways for habitat compensation, with special focus on the effect of added habitat heterogeneity.

This thesis examines the effects of habitat diversity on the macroinvertebrate family composition and functional organization in a nature-like, biocanal-type fishway. The biocanal contained four habitat types; riffle, pool, braided channel and floodplain. The effects of habitat diversity and large woody debris on brown trout habitat choice was also investigated in the biocanal. In addition, and prior to introduction of the threatened freshwater pearl mussel into the biocanal, the suitability of different brown trout strains as hosts for the mussel was examined.

The results show that the habitat heterogeneity in the biocanal contributed to an increased macroinvertebrate family diversity. The functional organization of the macroinvertebrate community suggests that it was a heterotrophic system and more functionally similar to the main river than to the small streams that it was created to resemble. Brown trout habitat choice studies showed that high densities of large woody debris increase the probability of fish remaining at the site of release. Testing of different brown trout strains as host for the freshwater pearl mussel revealed that both wild and hatchery-reared brown trout strains were suitable hosts. In summary, the results indicate that it is possible to create a fish passage with added value through its high habitat function and that nature-like fishways can be designed to reach multiple species restoration goals.

Abstract [en]

The construction of nature-like fishways has become an increasingly common measure to restore longitudinal connectivity in streams, but these fishways also have the potential to compensate for habitat degradation and loss associated with hydropower. The habitat potential of fishways has largely been overlooked, and therefore the aim of this dissertation was to examine the potential of nature-like fishways for habitat compensation, with special focus on the effect of added habitat heterogeneity.

I examined the effects of added habitat heterogeneity in a nature-like fishway on macroinvertebrate family composition and functional organization as well as on brown trout habitat choice. In addition, I studied the suitability of different strains of brown trout as hosts for the freshwater pearl mussel, one of the target species for this study.

I found that by relatively simple modifications to increase habitat diversity, including the addition of large woody debris, that one could not only accommodate specific target species, but also increase biodiversity in general. These results show that it is possible to build nature-like fishways with high habitat functionality that also include multiple species restoration goals.

Ort, förlag, år, upplaga, sidor
Karlstad: Karlstads universitet, 2017. s. 33
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2017:46
Nyckelord
Biocanal, biodiversity, brown trout, freshwater pearl mussel, functional feeding groups, habitat heterogeneity, large woody debris, macroinvertebrates, PIT-tag, salmonids
Nationell ämneskategori
Ekologi
Forskningsämne
Biologi
Identifikatorer
urn:nbn:se:kau:diva-65018 (URN)978-91-7063-823-7 (ISBN)978-91-7063-918-0 (ISBN)
Disputation
2017-12-15, 1B 306 Fryxellsalen, Karlstad, 13:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2017-11-24 Skapad: 2017-10-30 Senast uppdaterad: 2017-11-24Bibliografiskt granskad

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Gustafsson, StinaCalles, OlleÖsterling, Martin

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Gustafsson, StinaCalles, OlleÖsterling, Martin
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Institutionen för miljö- och livsvetenskaper (from 2013)
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