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Dynamic enforcement of bycatch via reproductive value can increase theoretical efficiency


Michael, PE and Wilcox, C and Barbraud, C and Delord, K and Sumner, M and Weimerskirch, H, Dynamic enforcement of bycatch via reproductive value can increase theoretical efficiency, Marine Policy, 132 Article 104684. ISSN 0308-597X (2021) [Refereed Article]

Copyright Statement

2021 Elsevier Ltd. All rights reserved.

DOI: doi:10.1016/j.marpol.2021.104684


Managing marine systems is challenging, as many marine species are highly mobile. Albatross exemplify this paradigm, overlapping multiple threats at sea, including bycatch. The typical characterization of bycatch, the number of individuals, ignores the long-term, population-wide repercussions of bycatch. Including an estimate of the reproductive value (RV, the loss of future reproductive contributions, given bycatch) is a complementary tool, incorporating the population-wide repercussions of bycatch. While bycatch management via dynamic spatial management allows management boundaries to move, it requires monitoring and enforcement to be effective. We provide a proof of concept to optimize bycatch enforcement activities by dynamically targeting areas of concentrated future productivity characterized by RV. This paper examined a population of black-browed albatross (Thalassarche melanophris) as a case study. We calculate RV and apply it to at-sea distributions. This creates spatiotemporally explicit surfaces used to prioritize times and locations for bycatch mitigation enforcement. Dynamic enforcement has greater theoretical efficiency than static enforcement, but this difference decreases with increasing population-wide RV subject to enforcement. Though there are implementation challenges, many can be reduced with existing tools providing various opportunities. Incorporating RV when characterizing the impacts of bycatch on a population and strategically applying dynamic bycatch enforcement based on RV can be a powerful, efficient component of dynamic ocean management.

Item Details

Item Type:Refereed Article
Keywords:bycatch, dynamic enforcement, dynamic ocean management, monitoring, reproductive value, albatross
Research Division:Environmental Sciences
Research Group:Environmental management
Research Field:Environmental assessment and monitoring
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Marine systems and management not elsewhere classified
UTAS Author:Michael, PE (Ms Pamela Michael)
UTAS Author:Sumner, M (Mr Michael Sumner)
ID Code:146051
Year Published:2021
Deposited By:Oceans and Cryosphere
Deposited On:2021-08-19
Last Modified:2021-11-25

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