Assembly rules for aggregate-species production models: simulations in support of management strategy evaluation

Marine Ecology Progress Series

Jason Link¹  Michael Fogarty¹  Hugues Beno#xeet¹  Tim Essington¹  Caihong Fu¹  Robert Gamble¹  Mariano Koen-Alonso¹  Sarah Gaichas¹ 

关键词: Ecosystem-based fishery management;    Multiple objectives;    Surplus production models;    Biological reference points;    Predation;    Competition;    Species complexes;   

DOI  :  10.3354/meps09650

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: Ecosystem-based fisheries management (EBFM) emphasizes sustainability at multiple levels of organization beyond single target species. Therefore, biological reference points (BRPs) for aggregated groups are required, which optimize yields while preventing overexploitation of individual species. We evaluate the tradeoffs between yield and biodiversity objectives for a wide range of aggregation strategies using multispecies surplus production models and comparing 2 simulated fish communities. We simulated population trajectories with an operating model detailing predation and competitive interactions for all individual species within each community, and with additional stochastic environmental variability for one community. Species trajectories were then aggregated by functional feeding guild, taxonomy, habitat association, size class, and at the entire community level. We estimated production parameters and BRPs (e.g. maximum sustainable yield, MSY) using a simple assessment model applied to each aggregated time series, then we applied the MSY fishing rates to each simulated community as alternative fishing strategies and compared equilibrium biomass and yield under each strategy. We were able to define multi-species reference points to meet both yield and biodiversity objectives across full system, taxonomic, habitat, feeding, and size-based aggregations. Species complexes were best able to meet both objectives when species with broadly similar productivity, environmental sensitivity and species interactions were aggregated into the complex. The impacts of simulated environmental variability on BRPs were substantial for certain species and aggregates, so including the combined impacts of environmental variation and species interactions in precautionary reference points appears critical to EBFM.

【 授权许可】

Unknown