Peer-Reviewed Journal Details
Mandatory Fields
Kelly, S;Moore, TN;de Eyto, E;Dillane, M;Goulon, C;Guillard, J;Lasne, E;McGinnity, P;Poole, R;Winfield, IJ;Woolway, RI;Jennings, E
2020
November
Climatic Change
Warming winters threaten peripheral Arctic charr populations of Europe
Validated
WOS: 6 ()
Optional Fields
TROUT SALMO-TRUTTA SALVELINUS-ALPINUS POPULATIONS SPAWNING GROUNDS ATLANTIC SALMON CLIMATE-CHANGE FRESH-WATER EMBRYONIC-DEVELOPMENT TEMPERATURE WINDERMERE TRENDS
163
599
618
As the global climate warms, the fate of lacustrine fish is of huge concern, especially given their sensitivity as ectotherms to changes in water temperature. The Arctic charr (Salvelinus alpinusL.) is a salmonid with a Holarctic distribution, with peripheral populations persisting at temperate latitudes, where it is found only in sufficiently cold, deep lakes. Thus, warmer temperatures in these habitats particularly during early life stages could have catastrophic consequences on population dynamics. Here, we combined lake temperature observations, a 1-D hydrodynamic model, and a multi-decadal climate reanalysis to show coherence in warming winter water temperatures in four European charr lakes near the southernmost limit of the species' distribution. Current maximum and mean winter temperatures are on average similar to 1 degrees C warmer compared to early the 1980s, and temperatures of 8.5 degrees C, adverse for high charr egg survival, have frequently been exceeded in recent winters. Simulations of winter lake temperatures toward century-end showed that these warming trends will continue, with further increases of 3-4 degrees C projected. An additional 324 total accumulated degree-days during winter is projected on average across lakes, which could impair egg quality and viability. We suggest that the perpetuating winter warming trends shown here will imperil the future status of these lakes as charr refugia and generally do not augur well for the fate of coldwater-adapted lake fish in a warming climate.
DORDRECHT
0165-0009
10.1007/s10584-020-02887-z
Grant Details