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The importance
of environmental and climate variability to biological and fish production in the
Scotia-Maine region is being investigated through collaborations in the U.S. and
Canada GLOBEC programs. The 3-d finite-element hydrodynamics model and
associated bio-physical models are being used, together with retrospective data
analyses, to interpret observational information on the physical environment, nutrients,
plankton and fish for key trophic linkages and hydrodynamic influences. Variability on
seasonal, interannual and decadal time scales is being examined.
The U.S.
GLOBEC applications are focused on cod and haddock ichthyoplankton retention on,
and zooplankton supply to Georges Bank. For model-based studies of advective
influences on ichthyoplankton distributions, see
Werner et al. (1993) and Lough et al. (1994).
For a model-based study of the supply of Calanus from the Gulf of Maine to Georges
Bank, see Hannah et al. (1996a) for a
poster paper and
Hannah et al. (1998a) for a manuscript.
For example displays from model applications to plankton drift in the Georges Bank
region, see the Click-On Table below. For further information on
the finite-element model applications to Georges Bank in U.S. GLOBEC, see
Dartmouth College homepage .
The Canada
GLOBEC applications will focus on gadoid production and stock structure on the
Scotian Shelf, drawing on observational data from the Fisheries Ecology Program, the
Scotian Shelf Ichthyoplankton Program, GLOBEC field studies, fisheries surveys, and
other sources. The importance of both direct environmental influences (e.g.,
temperature, circulation) and indirect influences (e.g., nutrient and plankton supply)
affecting lower-trophic-level production will be examined.
For work on early life stage modeling of haddock on Browns bank
Shackell et al. (1999),
Brickman et al. (2000),
Brickman et al. (2001a) and
Brickman et al. (2001b).
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Example Particle-Tracking Experiments: |
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Winter |
Spring |
Summer |
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Calanus Drift from Gulf of Maine |
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Calanus Drift from Georges Basin |
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Calanus Drift from Scotian Shelf |
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Larval Drift on Georges Bank (1m vs 40m) |
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Larval Drift on Georges Bank (gyral recirculation) |
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Larval Drift on Browns Bank |
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Calanus Drift from Scotian Shelf |
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