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Writing in Nature Climate Change, Dúran Vinent and Moore1 suggest that barrier islands are intrinsically bistable, existing in one of two equilibrium states, and that the state can be used
to predict island response to climate change. Bistability exists when any system can exist in two distinct states of equilibrium2. Applied to barrier islands, Dúran Vinent and Moore claim
that extrinsic variable changes (that is, reduced sediment supply) alter system parameters (dune-building) and can push entire islands across a threshold from one equilibrium state to an
alternate equilibrium state, from high to low, for example. This results in fundamental changes to system properties and affects island resilience. However, barrier islands do not function
within a dichotomous framework of bistability where 'low' islands are simply an alternate equilibrium state.
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