Abstract
Fish face many anthropogenic stressors. Authorities in marine, estuarine, and freshwater realms often share interdependent fisheries management goals, but address singular stressors independently. Here, we present a case study suggesting that coordinating stressor relief across management realms may synergize conservation efforts, especially to actualize restoration benefits. Major efforts are underway to restore juvenile salmon habitat across California’s Central Valley landscape, but it is unclear how fisheries and flow management will influence juvenile salmon occupancy of restored sites. Leveraging monitoring data, we find that for juvenile salmon (<55 mm) to actualize benefits of restored habitats will likely require maintaining spawner abundances and flows at or above intermediate values, especially in less-connected portions of the landscape. Furthermore, restoration efforts may prioritize more connected regions to promote use of restored areas, considering that less connected areas are often uninhabited when water and spawners are scarcer. This ecosystem-based framework that evaluates interdependencies of management decisions may be applied to realize natural productivity and enhance conservation in many systems.
Highlights
In April 2008 the Pacific Fishery Management Council (PFMC) adopted the most restrictive salmon fisheries in the history of the west coast of the U.S, in response to the sudden collapse of Sacramento River fall Chinook (SRFC) salmon and the poor status of many west coast coho salmon populations
What caused the observed general pattern of low salmon escapement? For the SRFC stock, which is an aggregate of hatchery and natural production (but probably dominated by hatchery production (Barnett-Johnson et al, 2007)), freshwater withdrawals, unusual hatchery events, pollution, elimination of net-pen acclimatization facilities coincident with one of the two failed brood years, and large-scale bridge construction during the smolt outmigration along with many other possibilities have been suggested as prime candidates causing the poor escapement (CDFG, 2008)
Marine mammals and birds which migrate to the coastal waters of northern California in spring and summer, expecting to find high numbers of energeticallyrich zooplankton and small pelagic fish upon which to feed, were impacted
Summary
An organizational element within NOAA, the Office of Fisheries is responsible for fisheries policy and the direction of the National Marine Fisheries Service (NMFS). In addition to its formal publications, the NMFS uses the NOAA Technical Memorandum series to issue informal scientific and technical publications when complete formal review and editorial processing are not appropriate or feasible. Documents within this series, reflect sound professional work and may be referenced in the formal scientific and technical literature. Secretary National Oceanic and Atmospheric Administration Jane Lubchenco, Undersecretary for Oceans and Atmosphere National Marine Fisheries Service James W. Weight and condition factor of juvenile Chinook over the Maximum autocorrelation factor analysis (MAFA) of Central Val-
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