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Due
to the circulation gyre, the residence time of water over the Bank is long
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relative
to biological time scales so that in situ growth rather than lateral
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exchange
is the dominant process controlling population abundance on the
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Bank
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Fine-scale
horizontal exchange causes significant leakage of nutrients,
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plankton
and fish larvae across the frontal boundaries of the Bank, thus
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causing
a chronic input and exchange/loss of nutrients, plankton and fish
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larvae
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Secondary
circulation associated with the tidal mixing fron causes a surface
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convergence
near the well-mixed area boundary, providing a mechanism for
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concentrating
target species in the tidal front zone. Transport towards the
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center
of the Bank should be greatest for plankton in the upper layer of the
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water
column in this zone, or for those species that undertake vertical
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migrations.
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Periodic
vertical migration of zooplankton and juvenile fish into and out of the
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sheared
bottom-boundary layer can lead to horizontal movement against the
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mean
flow
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