Equilibrium reference point calculations for the next generation of spatial assessments
Type | Article | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Date | 2021-12 | ||||||||||||
Language | English | ||||||||||||
Author(s) | Kapur M. S.1, Siple M. C.2, Olmos Maxime3, Privitera-Johnson K. M.1, Adams G.1, Best J.4, Castillo-Jordan C.5, Cronin-Fine L.4, Havron A. M.6, Lee Q.1, Methot R. D.7, Punt Andre E.1 | ||||||||||||
Affiliation(s) | 1 : School of Aquatic and Fisheries Sciences, University of Washington, Seattle, WA 98195, USA 2 : Resource Assessment and Conservation Engineering Division, Alaska Fisheries Science Center, National Oceanic and Atmospheric Administration, 7600 Sand Point Way N.E., Seattle, WA 98115, USA 3 : College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97330, USA 4 : Quantitative Ecology and Resource Management, University of Washington, Ocean Teaching Building, Suite 300, Seattle, WA, Box 357941, 98195, USA 5 : Oceanic Fisheries Programme, The Pacific Community (SPC), B.P. D5, 98848 Nouméa, New Caledonia 6 : ECS Federal in Support of National Oceanic and Atmospheric Administration Office of Science & and Technology, 1315 East-West Boulevard, Silver Spring, MD 20910, USA 7 : National Marine Fisheries Service, Silver Spring, MD, USA |
||||||||||||
Source | Fisheries Research (0165-7836) (Elsevier), 2021-12 , Vol. 244 , P. 106132 (13p.) | ||||||||||||
DOI | 10.1016/j.fishres.2021.106132 | ||||||||||||
WOS© Times Cited | 9 | ||||||||||||
Keyword(s) | Fisheries assessment, Fisheries management, Recruitment, Spatial dynamics | ||||||||||||
Abstract | Fish populations with spatial structure inherently violate the assumption of a single well-mixed stock, necessitating the use of spatially-structured population dynamics models. Accounting for spatial structure accurately and easily is a major goal for the next generation of stock assessment software development. Reference points (e. g., limit or target harvest rates and their associated biomass) are inherent to stock assessments and are often calculated under equilibrium conditions. However, the calculation process can be challenging for spatiallystructured population dynamics models. We outline how to calculate equilibrium quantities within spatiallystructured models where density-dependence in recruitment is local. We compare those values to equivalent situations when density-dependence in recruitment is global, thereby extending the set of population dynamics models on which spatially-structured stock assessments could be based. Results suggest that our method for calculating reference points under the assumption of local density-dependence can be performed using a straightforward optimization routine, and provide clearer understanding of the effects of fishing on a spatiallystructured population. Finally, we address areas of research and development needed to integrate spatiallystructured population dynamics models within existing management systems. |
||||||||||||
Full Text |
|