Post-harvest recovery dynamics depend on predator specialization in size-selective fisheries
| Autor: | Marissa L. Baskett, Emilius A. Aalto |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Biomass (ecology) Ecology biology Obligate 010604 marine biology & hydrobiology Marine reserve Haddock Aquatic Science Generalist and specialist species biology.organism_classification 010603 evolutionary biology 01 natural sciences Predation Fishery Abundance (ecology) Predator Ecology Evolution Behavior and Systematics |
| Zdroj: | Marine Ecology Progress Series. 564:127-143 |
| ISSN: | 1616-1599 0171-8630 |
| DOI: | 10.3354/meps11987 |
| Popis: | Author(s): Aalto, EA; Baskett, ML | Abstract: Fisheries typically truncate target species' size distributions through an increase in mortality, especially if harvest is size-selective. Such truncation can push a harvested species' size distribution into classes most vulnerable to gape-limited predation, such that predator-prey dynamics might affect the rate of recovery from fishing. Understanding this rate of recovery is crucial to adaptive management of no-take reserves and fisheries closures. We used a 2-species size-structured model to examine how gape-limited predation alters post-harvest recovery for 3 example prey species, viz. cod, haddock, and whiting. We found little difference in recovery patterns of prey abundance and size structure between systems with gape-limited generalist predation and those with no size-dependent predation. However, gape-limited obligate predation can lead to fluctuations, with transient declines, that delay recovery to the pre-harvest equilibrium for both biomass and mean size due to a time lag in predator recovery. Fluctuating recovery dynamics under obligate predation were most likely for predators that experienced greater declines due to prey loss during harvest and for slow-growing prey with an adult size refuge. We conclude that through these delays, the presence of a strong dynamically linked predator can alter the expec - tations of the time scale for different recovery metrics used in adaptive management. |
| Databáze: | OpenAIRE |
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