Coastal river connectivity and the distribution of ascending juvenile European eel (Anguilla anguilla L.): Implications for conservation strategies regarding fish-passage solutions

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Coastal river connectivity and the distribution of ascending juvenile European eel (Anguilla anguilla L.) : Implications for conservation strategies regarding fish-passage solutions

Tamario, Carl (author): Sveriges lantbruksuniversitet,Linnéuniversitetet,Institutionen för biologi och miljö (BOM),Swedish University of Agricultural Sciences, Sweden.;Linnaeus University, Sweden,Ctr Ecol & Evolut Microbial Model Syst EEMiS,Institutionen för akvatiska resurser,Department of Aquatic Resources,Linnaeus University

Calles, Olle, 1974- (author): Karlstads universitet,Institutionen för miljö- och livsvetenskaper (from 2013)

Watz, Johan, 1977- (author): Karlstads universitet,Institutionen för miljö- och livsvetenskaper (from 2013)

Nilsson, Per Anders, 1968- (author): Karlstads universitet,Institutionen för miljö- och livsvetenskaper (from 2013)

Degerman, Erik (author): Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för akvatiska resurser,Department of Aquatic Resources,Swedish University of Agricultural Sciences, Sweden

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2019-03-25
2019
English.
In: Aquatic conservation. - : John Wiley & Sons. - 1052-7613 .- 1099-0755. ; 29:4, s. 612-622

Related links:: https://doi.org/10.1...; show more...; https://onlinelibrar...; https://urn.kb.se/re...; https://doi.org/10.1...; https://res.slu.se/i...; https://urn.kb.se/re...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

Many diadromous fish populations are declining and at risk of collapse. Lack of river connectivity is a major contributor to these declines, as free migration routes between marine and freshwater habitats are crucial for life-history completion. For the conservation and ultimately recovery of such species, it is imperative that remedial measures aimed at increasing connectivity are effective. This study investigated the distribution patterns of ascending juvenile European eel (Anguilla anguilla L.) in rivers in south-western Sweden, with a focus on the effects of barriers and measures that aim to reduce the impact of barriers, i.e. fish-passage solutions (FPSs). Eel occurrence data were spatially and temporally integrated with the national databases of dams and FPSs in a Geographic Information System (GIS) environment to evaluate their effect on ascending eel distribution. The types of barriers assessed were: (i) dams with nature-like fishways; (ii) dams with eel ramps; (iii) dams with technical fishways; and (iv) dams without FPSs. Dams fitted with eel ramps or technical fishways, as well as dams without FPSs, produced a significant negative effect on the probability of eel occurrence upstream. This negative effect was not found for dams fitted with nature-like fishways, indicating that these solutions may function better than the other FPS types in this study. The probability of eel occurrence decreased with distance from the sea and increased with area sampled, number of electrofishing runs, water temperature, and with the size of the bottom substrate. We suggest that future conservation strategies for improving the natural immigration of juvenile eels should include optimizing FPS function (e.g. placement and design), the continued maintenance of FPSs, the construction of nature-like fishways, and preferably the removal of dams, which will also benefit the downstream migration of maturing eels as well as restoring other ecosystem services.

Subject headings

NATURVETENSKAP -- Biologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences (hsv//eng)
LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Fisk- och akvakulturforskning (hsv//swe)
AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Fish and Aquacultural Science (hsv//eng)
NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)

Keyword

barriers
dams
dispersal
eel ladders
eel management
electrofishing
fish passage
fishways
ramps
Akvatisk ekologi
Aquatic Ecology
Biology

Publication and Content Type

ref (subject category)
art (subject category)

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By the author/editor: Tamario, Carl; Calles, Olle, 19 ...; Watz, Johan, 197 ...; Nilsson, Per And ...; Degerman, Erik

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...

AGRICULTURAL SCIENCES: AGRICULTURAL SCI ...; and Agriculture Fore ...; and Fish and Aquacul ...

NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

Articles in the publication: Aquatic conserva ...

By the university: Linnaeus University; Swedish University of Agricultural Sciences; Karlstad University

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