FishBase: a database and fisheries management-orientated tool for the 21<sup>st</sup>century

Zyl, Burné van; Willemse, NE

doi:10.2989/160859100780177703

African Journal of Aquatic Science

2000

DOI: 10.2989/160859100780177703

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FishBase: a database and fisheries management-orientated tool for the 21^stcentury

Burné van Zyl¹,

NE Willemse²

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Environmental controls on marine productivity near Cape St. Francis, South Africa

Jury

2019

Ocean Sci.

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This study considers ocean-atmosphere influences on marine productivity over the shelf near Cape St. Francis, South Africa. Multiday estimates of chlorophyll fluorescence in the period 2006-2017 with an area outlined by 34.5-33.75 • S and 24-26.5 • E provide the basis for evaluation using data from high-resolution reanalyses.Correlations with the mean annual cycle of chlorophyll fluorescence were significant for salinity, linking marine productivity and the coastal hydrology. A strengthened Agulhas Current induces cyclonic shear that lifts water at the shelf edge. Composite high-chlorophyll-fluorescence events were dominated by a large-scale midlatitude atmospheric ridge of high pressure. The resultant easterly winds caused offshore transport and the upwelling of cool nutrient-rich water in multiday events at the beginning and end of austral summer. Environmental controls on interannual fluctuations of the commercial fishery were also explored. Southwestward currents and diminished heat fluxes favored the squid catch, while anchovy and sardine catches were linked with upper northerly wind, consistent with large-scale weather patterns that underpin coastal upwelling and river discharge. Productivity lags a few days behind cyclonic wind and current shear and the upstream coastal hydrology, which shares a common atmospheric driver.Published by Copernicus Publications on behalf of the European Geosciences Union.

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Environmental controls on marine productivity near Cape St. Francis, South Africa

Jury

2019

Ocean Sci.

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FishBase: a database and fisheries management-orientated tool for the 21^stcentury

Cited by 1 publication

References 0 publications

Environmental controls on marine productivity near Cape St. Francis, South Africa

Environmental controls on marine productivity near Cape St. Francis, South Africa

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FishBase: a database and fisheries management-orientated tool for the 21stcentury

Cited by 1 publication

References 0 publications

Environmental controls on marine productivity near Cape St. Francis, South Africa

Environmental controls on marine productivity near Cape St. Francis, South Africa

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Product

Resources

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FishBase: a database and fisheries management-orientated tool for the 21^stcentury