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Observing the Arctic: A comparison of environmental DNA (eDNA) and electrofishing for monitoring Arctic char and Atlantic salmon

Jacobsen, Magnus W. ; Nygaard, Rasmus ; Hansen, Brian K. ; Broberg, Mala ; Hansen, Michael M. ; Hedeholm, Rasmus ; Nielsen, Einar E.

Environmental DNA (Hoboken, N.J.), 2023-07, Vol.5 (4), p.782-795 [Periódico revisado por pares]

Hoboken: John Wiley & Sons, Inc

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  • Título:
    Observing the Arctic: A comparison of environmental DNA (eDNA) and electrofishing for monitoring Arctic char and Atlantic salmon
  • Autor: Jacobsen, Magnus W. ; Nygaard, Rasmus ; Hansen, Brian K. ; Broberg, Mala ; Hansen, Michael M. ; Hedeholm, Rasmus ; Nielsen, Einar E.
  • Assuntos: Abundance ; Anthropogenic factors ; Arctic monitoring ; Biodiversity ; Climate change ; Cold ; Complications ; electrofishing ; Environmental DNA ; Fish ; Geographical distribution ; Human influences ; Indigenous species ; Introduced species ; Invasive species ; Monitoring ; Native species ; Polar environments ; proportion analysis ; quantification ; Relative abundance ; Rivers ; Salmo salar ; Salmon ; Salvelinus alpinus ; Sampling ; Surveys
  • É parte de: Environmental DNA (Hoboken, N.J.), 2023-07, Vol.5 (4), p.782-795
  • Descrição: The current knowledge about fish biodiversity and species distributions in Arctic freshwater systems is generally limited. This contrasts the clear urgency for more accurate biodiversity data to assess the effects of future ecosystem challenges such as climate change and other anthropogenic effects. Here we compare traditional electrofishing surveys with environmental DNA (eDNA) for monitoring species distribution of Atlantic salmon (Salmo salar) and Arctic char (Salvelinus alpinus) in the West Greenlandic sub‐Arctic river system of Kapisillit, which contains the only known population of Atlantic salmon in Greenland. Overall, electrofishing and eDNA surveys show high compatibility in regard to species detection and quantification, with Arctic char confirming a significant relationship between eDNA concentration and observed fish abundance. Both methods confirm a shift in species occurrence and relative species abundance through the river system. Specifically, salmon is restricted to the lower warmer sections of the river system while Arctic char is found throughout the system but dominates the upper parts. In total, the study supports eDNA as a promising tool for fish community assessment, which may serve a wide array of applications for Arctic freshwater monitoring. These applications include analyzing species occurrence and distribution of native and invasive species, as well as documenting potential shifts in relative species abundance as shown here. Given the ease of sampling and high sensitivity of the method, eDNA provides a powerful cost‐effective approach capable of detecting species in remote areas as well as corroborating fish community monitoring programs. This may especially be valuable for monitoring in the Arctic where logistic complications with sampling and high operational costs so far constrains routine monitoring. In this study, we compare eDNA with electrofishing for detection and quantification of Arctic char and Atlantic salmon in the Greenlandic river system of Kapisillit. Overall, the two methods show high similarity and confirm a shift in species occurrence and species abundance up through the river system. Given the ease of sampling and high sensitivity of the method, eDNA may constitute a powerful cost‐effective alternative to traditional biodiversity surveys for documenting the fish community in the Arctic where logistic complications with sampling and high operational costs so far constrains routine monitoring.
  • Editor: Hoboken: John Wiley & Sons, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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