Alternative equilibria and resilience in Arctic aquatic systems Arctic Frontiers ATP 2011 Tromsø Primicerio R, Amundsen P-A, Aschan M, Knudsen R, Planque

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Alternative equilibria and resilience in Arctic aquatic systems Arctic Frontiers ATP 2011 Troms Primicerio R, Amundsen P-A, Aschan M, Knudsen R, Planque B, Varpe BarEcoReATP Slide 2 Alternative equilibria in the Arctic Outline Bistability and resilience Mechanisms of bistability Managing metastable systems Slide 3 Bistability and resilience Alternative equilibria in Arctic aquatic systems Management challenges of tipping points Alternative equilibria in the Arctic Slide 4 Bistability and resilience Alternative equilibria in Arctic aquatic systems Management challenges of tipping points Lake Takvatn 2009 TREE Alternative equilibria in the Arctic Slide 5 Bistability and resilience Lake Takvatn Culling experiment - removed 31 tons (660000 individuals) of Arctic charr in the period 1984 to 1989 Alternative equilibria in the Arctic 2007 Science Slide 6 Bistability and resilience Lake Takvatn Alternative equilibria in the Arctic Slide 7 Bistability and resilience Lake Takvatn Alternative equilibria in the Arctic Tipping point Slide 8 Bistability and resilience Lake Takvatn Alternative equilibria in the Arctic Tipping point Slide 9 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 10 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 11 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Tipping point Slide 12 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Tipping point Slide 13 Mechanisms of bistability Lake Takvatn Juveniles Adults Alternative equilibria in the Arctic Slide 14 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 15 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 16 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 17 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 18 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 19 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 20 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 21 Mechanisms of bistability Emergent Allee effect Alternative equilibria in the Arctic Slide 22 Mechanisms of bistability Lake Takvatn Alternative equilibria in the Arctic Slide 23 Bistability and resilience Regime shifts variable vs parameter change Resilience ecological vs engineering Slide 24 Fishing induced evolution in salmonids Maturation schedules Arctic charr in Lake Takvatn Fish removal Suspended harvest