FN Archimer Export Format PT J TI Modelling chance and necessity in natural systems BT AF Planque, Benjamin Mullon, Christian AS 1:1;2:2; FF 1:;2:; C1 Institute of Marine Research, Ecosystem Processes Research Group, Tromsø, Norway MARBEC, IRD; Université de Montpellier; IFREMER; CNRS; Sète, France C2 INST MAR RES, NORWAY IRD, FRANCE UM MARBEC IN WOS Cotutelle UMR copubli-europe IF 3.593 TC 10 UR https://archimer.ifremer.fr/doc/00585/69686/67759.pdf LA English DT Article DE ;chaos theory;constraints;nonlinear systems;participatory modelling;uncertainty;viability theory AB Nearly 30 years ago, emerged the concept of deterministic chaos. With it came sensitivity to initial conditions, nonlinearities, and strange attractors. This constituted a paradigm shift that profoundly altered how numerical modellers approached dynamic systems. It also provided an opportunity to resolve a situation of mutual misunderstanding between scientists and non-scientists about uncertainties and predictability in natural systems. Our proposition is that this issue can be addressed in an original way which involves modelling based on the principles of chance and necessity (CaN). We outline the conceptual and mathematical principles of CaN models and present an application of the model to the Barents Sea food-web. Because CaN models rely on concepts easily grasped by all actors, because they are explicit about knowns and unknowns and because the interpretation of their results is simple without being prescriptive, they can be used in a context of participatory management. We propose that, three decades after the emergence of chaos theories, CaN can be a practical step to reconcile scientists and non-scientists around the modelling of structurally and dynamically complex natural systems, and significantly contribute to ecosystem-based fisheries management. PY 2020 PD JUN SO Ices Journal Of Marine Science SN 1054-3139 PU Oxford University Press (OUP) VL 77 IS 4 UT 000582718700026 BP 1573 EP 1588 DI 10.1093/icesjms/fsz173 ID 69686 ER EF