Journal ArticleDOI
Effects of artificial instream cover on the density of 0 + brown trout
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The results indicate that instream cover from submerged macrophytes may be important for maintaining high 0 + trout densities in small and medium-sized streams where other types of instREAM cover are in short supply.Abstract:
The effect of instream cover on the density of juvenile sea trout, Salmo trutta L., in two streams in southern Sweden was studied. One of the streams, Vallkarrabacken, was narrow (2–3 m) and had few sympatric species, whereas the other stream, Braan, was wider (6–8 m) and had many sympatric species. Three treatments were used: (1) addition of artificial vegetation; (2) an undisturbed control; and (3) removal of natural vegetation. Only the first two treatments were tested in Braan, whereas all three treatments were tested in Vallkarrabacken. The 0 + trout density was higher in sections containing artificial vegetation than in control sections, which in turn had higher densities than sections where natural vegetation was removed. Moreover, the effect of adding artificial vegetation on trout density was most pronounced at the end of the summer. The results indicate that instream cover from submerged macrophytes may be important for maintaining high 0 + trout densities in small and medium-sized streams where other types of instream cover are in short supply.read more
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Effect of a change in physical structure and cover on fish and fish habitat in freshwater ecosystems – a review and meta-analysis
TL;DR: To assess the weight of scientific evidence in support of management decisions, both the observational and experimental freshwater fish-habitat literature is summarized and data from experimental studies are extracted for inclusion in a meta-analysis.
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Searching for biodiversity indicators in running waters: do bryophytes, macroinvertebrates, and fish show congruent diversity patterns?
TL;DR: The regression models explained 23, 45, and 26% of the variation in species richness of bryophytes, macroinvertebrates, and fish, respectively, and suggest that indicator taxa may be of limited value in stream biodiversity inventories.
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The status of host fish populations and fish species richness in European freshwater pearl mussel (Margaritifera margaritifera) streams
TL;DR: It is suggested that 0+ host fish are not necessarily required to sustain functional pearl mussel populations, and low densities of host fish can be compensated by the higher glochidia carrying capacity of older host fish with limited previous contact with pearl mussels, by the long reproductive period of mussel, and by low mortality rates of juvenile mussels during their post-parasitic phase.
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Impact of channel bar form and grain size variability on estimated stranding risk of juvenile brown trout during hydropeaking
TL;DR: The results showed that point bar morphology, in particular, was less sensitive to the risk of stranding compared to, for example, alternating gravel bars, and the improvement of structural features due to bar formation and related self-forming processes is discussed as a possible alternative for future mitigation measures to reduce the negative impacts of hydropeaking.
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Effects of habitat rehabilitation on brown trout (Salmo trutta) in boreal forest streams
Teppo Vehanen,Ari Huusko,Aki Mäki-Petäys,Pauliina Louhi,Heikki Mykrä,Timo Muotka,Timo Muotka +6 more
TL;DR: In this article, the authors used a spatially and temporally replicated, balanced Before-After-Control-Impact design to assess the impact of stream habitat rehabilitation on the densities and growth of brown trout of three age-classes in North Finnish forest streams.