Can Georges Bank larval cod survive on a calanoid diet?

Lynch, Daniel R.; Lewis, Craig V.W.; Werner, Francisco E.

doi:10.1016/s0967-0645(00)00129-6

Cited by 30 publications

(29 citation statements)

References 27 publications

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“…Detailed simulations of the anti-clockwise circulation around the Bank describe the transport of cod and haddock larvae from spawning sites on the north-east peak to potentially rich food on the southern flank of the Bank, Fig. 1 (Werner et al 1996;Lynch et al 2001). Larval growth rates are correlated with copepod abundance, particularly Pseudocalanus spp.…”

Section: A Case Study: Georges Bankmentioning

confidence: 99%

Reconciling end-to-end and population concepts for marine ecosystems

Steele

Gifford

2010

Journal of Marine Systems

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The inherent complexities in the structure and dynamics of marine food webs have led to two major simplifying concepts, a species-centric approach focused on physical processes driving the population dynamics of single species and a trophic-centric approach emphasizing energy flows through broad functional groups from nutrient input to fish production. Here we review the two approaches and discuss their advantages and limitations. We suggest that these concepts are complementary: their applications involve different time scales and distinct aspects of population and community resilience, but their integration is necessary for ecosystem-based management

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Section: A Case Study: Georges Bankmentioning

confidence: 99%

Reconciling end-to-end and population concepts for marine ecosystems

Steele

Gifford

2010

Journal of Marine Systems

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“…are dominant on the Bank during the GLOBEC surveys. We take their weights, 70 and 7 μg C respectively (Lynch et al, 2001), to represent the principal size categories of mesozooplankton. A range of values is given in Table 1.…”

Section: Mesozooplanktonmentioning

confidence: 99%

“…are dominant on the crest and C. finmarchicus near the shelf edge (Lynch et al, 2001;Meise and O'Reilly, 1996). We formalize this by assigning "small" (7 μg C) mesozooplankton to the Mixed region and "large"…”

Section: Mesozooplanktonmentioning

confidence: 99%

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Balancing end-to-end budgets of the Georges Bank ecosystem

Steele

Collie

Bisagni

et al. 2007

Progress in Oceanography

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Oceanographic regimes on the continental shelf display a great range in the time scales of physical exchange, biochemical processes and trophic transfers. The close surface-to-seabed physical coupling at intermediate scales of weeks to months means that the open ocean simplification to a purely pelagic food web is inadequate. Top-down trophic depictions, starting from the fish populations, are insufficient to constrain a system involving extensive nutrient recycling at lower trophic levels and subject to physical forcing as well as fishing. These pelagicbenthic interactions are found on all continental shelves but are particularly important on the relatively shallow Georges Bank in the northwest Atlantic. We have generated budgets for the 1 lower food web for three physical regimes (well mixed, transitional and stratified) and for three seasons (spring, summer and fall/winter). The calculations show that vertical mixing and lateral exchange between the three regimes are important for zooplankton production as well as for nutrient input. Benthic suspension feeders are an additional critical pathway for transfers to higher trophic levels. Estimates of production by mesozooplankton, benthic suspension feeders and deposit feeders, derived primarily from data collected during the GLOBEC years of 1995-1999, provide input to an upper food web. Diets of commercial fish populations are used to calculate food requirements in three fish categories, planktivores, benthivores and piscivores, for four decades, 1963-2002, between which there were major changes in the fish communities.Comparisons of inputs from the lower web with fish energetic requirements for plankton and benthos indicate that we obtained reasonable agreement for the last three decades, 1973 to 2002.However, for the first decade, the fish food requirements were significantly less than the inputs. This decade, 1963This decade, -1972, corresponds to a period characterized by a strong Labrador Current and lower nitrate levels at the shelf edge, demonstrating how strong bottom-up physical forcing may determine overall fish yields.

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“…Its numerical abundance is extremely high, and in many regions it dominates the mesoplanktonic biomass (Head et al 2003). Through grazing on phytoplankton it contributes substantially to oceanic secondary production (Aksnes & Blindheim 1996), and it is a major species of prey for a wide range of commercially exploited fish (Dalpadado et al 2000, Lynch et al 2001). On account of its key status, there is now a considerable body of laboratory and field data on C. finmarchicus, and there have been numerous attempts to understand its demography through modelling studies.…”

Section: Introductionmentioning

confidence: 99%

Ocean-scale modelling of the distribution, abundance, and seasonal dynamics of the copepod Calanus finmarchicus

Speirs¹,

Gurney²,

Heath³

et al. 2006

Mar. Ecol. Prog. Ser.

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The copepod Calanus finmarchicus is widely distributed over the sub-polar Atlantic and dominates the mesozooplanktonic biomass in that region. Despite this, all previous C. finmarchicus population modelling studies have been spatially and temporally limited. In this paper we present results from a fully stage-resolved model in a domain spanning the entire geographic range of the species (30 to 80°N and 80°W to 90°E. The model was driven by temperature and transport from the Ocean Circulation and Climate Advanced Modelling project (OCCAM) and phytoplankton food derived from satellite (SeaWiFS) sea-surface colour observations. The resulting quasi-stationary yearly cycle was assessed against seasonally resolved maps of continuous plankton recorder observations, winter cruise data on the distribution of diapausers, and time series from locations distributed over the North Atlantic. The model's high computational efficiency permitted its free parameters to be selected to yield a good correspondence with the field data. We were also able to explore the effects of changing the assumptions regarding diapause and mortality. By falsifying alternative models we conclude that (1) a fixed fraction of each surface generation enters diapause, (2) overwintering individuals enter diapause at the end of the fifth copepodite stage, and (3) mortality is an increasing function of temperature. Finally, we demonstrate that the demographic impact of transport is limited, except in shelf seas and at the edges of the distribution; nevertheless, there is a very high level of population connectivity over the whole domain.

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Can Georges Bank larval cod survive on a calanoid diet?

Cited by 30 publications

References 27 publications

Reconciling end-to-end and population concepts for marine ecosystems

Reconciling end-to-end and population concepts for marine ecosystems

Balancing end-to-end budgets of the Georges Bank ecosystem

Ocean-scale modelling of the distribution, abundance, and seasonal dynamics of the copepod Calanus finmarchicus

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