Dynamics of Marine Fish Populations

MacCall, Alec D.; Rothschild, Brian J.

doi:10.2307/1445688

Cited by 75 publications

(115 citation statements)

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“…During periods of high cod population size, its main pelagic food resource in the MB (i.e., the fish sprat) is depressed (17), and thus cod may search for alternative foraging habitats, as the GoR. This response would conform to the density-dependent ideal free-distribution theory (32), which suggests that as population size increases, individuals spread into less-favorable habitats. Also under these circumstances, however, some backmigration of cod individuals from the GoR to the MB also occurs, especially related to spawning (21), potentially stabilizing the source population and hence the source-sink dynamic (10).…”

Section: Resultsmentioning

confidence: 95%

Predator transitory spillover induces trophic cascades in ecological sinks

Casini

Blenckner²,

Möllmann³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

103

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Understanding the effects of cross-system fluxes is fundamental in ecosystem ecology and biological conservation. Source-sink dynamics and spillover processes may link adjacent ecosystems by movement of organisms across system boundaries. However, effects of temporal variability in these cross-system fluxes on a whole marine ecosystem structure have not yet been presented. Here we show, using 35 y of multitrophic data series from the Baltic Sea, that transitory spillover of the top-predator cod from its main distribution area produces cascading effects in the whole food web of an adjacent and semi-isolated ecosystem. At varying population size, cod expand/contract their distribution range and invade/retreat from the neighboring Gulf of Riga, thereby affecting the local prey population of herring and, indirectly, zooplankton and phytoplankton via top-down control. The Gulf of Riga can be considered for cod a "true sink" habitat, where in the absence of immigration from the source areas of the central Baltic Sea the cod population goes extinct due to the absence of suitable spawning grounds. Our results add a metaecosystem perspective to the ongoing intense scientific debate on the key role of top predators in structuring natural systems. The integration of regional and local processes is central to predict species and ecosystem responses to future climate changes and ongoing anthropogenic disturbances.ecosystem regulation | predator distribution | landscape ecology | exploited resources | cross-system management

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Section: Resultsmentioning

confidence: 95%

Predator transitory spillover induces trophic cascades in ecological sinks

Casini

Blenckner²,

Möllmann³

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

103

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show abstract

“…A coalition of fishermen, may benefit from specialization with one or more members carrying out search activities while others specialize in harvesting fish. Another motive for coordinating fishing activities is to avoid congestion costs that arise when multiple fishermen visit the same fishing site (MacCall (1990)). …”

Section: Introductionmentioning

confidence: 99%

Information Sharing and Cooperative Search in Fisheries

Evans

Weninger

2013

Environ Resource Econ

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We present a dynamic game of search and learning by fishermen who seek the true location of a partially observable fish stock. Bayesian Nash equilibrium search patterns for non-cooperating fishermen and members of an information sharing cooperative are compared with first-best outcomes. Independent fishermen do not internalize the full value of information and do not replicate first-best search. A fishing cooperative faces a free-riding problem as each member prefers another undertake costly search for information. Contractual agreements among coop members may mitigate, but not likely eliminate free-riding. Our results explain why information sharing is rare in fisheries and offer guidance for improving fishery management.

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“…An analysis in terms of catchability, following McCall [2] provides an alternative set of sufficient conditions. Suppose that as stock decreases, the area over which it is distributed decreases proportionally, but schooling behavior is unaffected, so that the concentration of fish within the area in which fish are present remains constant.…”

Section: How To Set Catch Quotas: a Note On The Superiority Of Constamentioning

confidence: 99%

“…However, it may be of interest to consider some simple dynamic extensions of the results derived above. Consider a simple dynamic model such as that of Scott [2] in which future stocks depend on current stocks, by a way of a simple concave increasing function (that is, the proportional growth rate of stocks is a diminishing function of current stocks). Then the first-order condition (1) must be modified to include a term for the marginal effect of increased current catch on future stocks.…”

Section: How To Set Catch Quotas: a Note On The Superiority Of Constamentioning

confidence: 99%

How to set catch quotas: A note on the superiority of constant effort rules

Quiggin

1992

Journal of Environmental Economics and Management

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Dynamics of Marine Fish Populations

Cited by 75 publications

References 0 publications

Predator transitory spillover induces trophic cascades in ecological sinks

Predator transitory spillover induces trophic cascades in ecological sinks

Information Sharing and Cooperative Search in Fisheries

How to set catch quotas: A note on the superiority of constant effort rules

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