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The impact of reintroduced Eurasian beaver (Castor fiber) dams on the upstream movement of brown trout (Salmo trutta) in upland areas of Great Britain — Europe PMC PMID:39946328

Source: Europe PMC (en)
Original: https://europepmc.org/article/MED/39946328
DOI: 10.1371/journal.pone.0313648
License (as archived): CC0-1.0
Archived: 2026-10-06T13:18:50.040Z
SHA-256 of the archived text: a4b4a2a5fc8a50fd94aa6c972b720803f6d6a949bed3b05690a8c2ba681a1e6d
Stable URL of this page: https://metraipolis.com/documento/dc_7a77bdccced8

How to cite

The impact of reintroduced Eurasian beaver (Castor fiber) dams on the upstream movement of brown trout (Salmo trutta) in upland areas of Great Britain — Europe PMC PMID:39946328 — Europe PMC (en), https://europepmc.org/article/MED/39946328 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_7a77bdccced8 (Metraipolis archive dc_7a77bdccced8, sha256 a4b4a2a5fc8a50fd94aa6c972b720803f6d6a949bed3b05690a8c2ba681a1e6d)

BibTeX

@misc{dc7a77bdccced8,
  title = {The impact of reintroduced Eurasian beaver (Castor fiber) dams on the upstream movement of brown trout (Salmo trutta) in upland areas of Great Britain — Europe PMC PMID:39946328},
  howpublished = {Europe PMC (en)},
  url = {https://europepmc.org/article/MED/39946328},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_7a77bdccced8; sha256 a4b4a2a5fc8a50fd94aa6c972b720803f6d6a949bed3b05690a8c2ba681a1e6d},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: Europe PMC (en), https://europepmc.org/article/MED/39946328. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The return of Eurasian beaver (Castor fiber) to large areas of Europe represents a conservation success with the current population estimated to be around 1.2 million individuals. Their reintroduction to many areas, including Great Britain, has in some cases been controversial. Despite numerous documented benefits to biodiversity, concerns relate to localised flooding, adverse impacts on land use and engineered structures (e.g. culvert blockage), disease transfer, and the influence of beaver habitat modifications on fisheries, particularly in relation to salmonids. This study investigated the impacts of a series of four beaver dams on the upstream movement of brown trout during the spawning period (October-December) at a field site in Scotland. The study site comprised two streams entering a common loch, one modified by a series of four beaver dams, the other remaining unaltered during the Study Period. Trout were captured using electric fishing, fyke nets and rod and line and were tagged with Passive Integrated Transponders (PIT) before release. PIT telemetry antennas were installed below and above each dam to establish successful passage of trout during the monitoring period that included trout spawning movements in 2015 (high flows) and 2016 (low flow). There was a distinct difference in passage success between years, with high flows (using prior rainfall as a proxy measure) and larger fish size being important positive predictors of upstream passage success. A combination of environmental (prior rainfall and water temperature) and biotic (fish size) factors influenced passage success with high flows being a significant covariate at all four dams in two models used to define trout passage dynamics (Weibull and exponential base models), providing the best explanatory variable for fish passage at two of the four dams. Survival analysis and associated modelling indicated that migratory delay was inversely related to previous passage success, whilst motivation was also a determinant of success, with greatest passage in highly motivated trout. Our findings indicate that given the right environmental and biotic factors, brown trout are adept at passing beaver dams, although under certain conditions, beaver dams can impede the movement of brown trout and the magnitude of impact is influenced by these factors. In particular, the barrier effects of beaver dams are exacerbated under low flow conditions, and this may become a greater challenge in the future due to shifting climatic conditions if periods of warmer and drier weather persist and coincide with peak migratory movements of fish.

Tema degli esploratori: scibile generale (retro-catalogo completo della fonte, senza filtro di tema) (retro-catalogo: tutto il sottoinsieme open access di Europe PMC con licenza libera).
Pubblicazione: PloS one, 2025 (prima pubblicazione 2025-02-13).
Identificativi: PMID 39946328 · PMCID PMC11825012 · DOI 10.1371/journal.pone.0313648.
Descrittori MeSH principali: Trout; Rodentia; Animal Migration; Conservation of Natural Resources.
Pagina: https://europepmc.org/article/MED/39946328 — https://doi.org/10.1371/journal.pone.0313648. Autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza dell'articolo dichiarata da Europe PMC: CC0 (la versione è indicata dall'editore sulla pagina). Abstract riportato senza modifiche al contenuto, con attribuzione; deposito marcato CC0.
Letto il 2026-10-06T11:32:36.163Z tramite l'API REST ufficiale di Europe PMC (EMBL-EBI), nel rispetto del robots.txt e del crawl-delay.