Should we expect a relationship between primary production and fisheries? The role of copepod dynamics as a filter of trophic variability

Runge, Jeffrey A.

doi:10.1007/bf00026294

Cited by 164 publications

(116 citation statements)

References 39 publications

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“…Warm-water blooms also may result in a larger biomass of zooplankton than cold-water blooms or blooms in which new production is confined to a brief, intense early pulse. The lack of tight coupling between zooplankton production and primary production makes difficult the detection of the responses of zooplankton (and fish recruitment) to variations in primary production (Runge, 1988). (4) Copepod production is fully or nearly fully consumed by planktivores (fish, euphausiids and gelatinous zooplankton).…”

Section: Conceptual Modelsmentioning

confidence: 99%

Climate change and control of the southeastern Bering Sea pelagic ecosystem

Hunt

Stabeno

Walters

et al. 2002

Deep Sea Research Part II: Topical Studies in Oceanography

496

385

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We propose a new hypothesis, the Oscillating Control Hypothesis (OCH), which predicts that pelagic ecosystem function in the southeastern Bering Sea will alternate between primarily bottom-up control in cold regimes and primarily top-down control in warm regimes. The timing of spring primary production is determined predominately by the timing of ice retreat. Late ice retreat (late March or later) leads to an early, ice-associated bloom in cold water (e.g., 1995, 1997, 1999), whereas no ice, or early ice retreat before mid-March, leads to an open-water bloom in May or June in warm water (e.g., 1996, 1998, 2000). Zooplankton populations are not closely coupled to the spring bloom, but are sensitive to water temperature. In years when the spring bloom occurs in cold water, low temperatures limit the production of zooplankton, the survival of larval/juvenile fish, and their recruitment into the populations of species of large piscivorous fish, such as walleye pollock (Theragra chalcogramma), Pacific cod (Gadus macrocephalus) and arrowtooth flounder (Atheresthes stomias). When continued over decadal scales, this will lead to bottom-up limitation and a decreased biomass of piscivorous fish. Alternatively, in periods when the bloom occurs in warm water, zooplankton populations should grow rapidly, providing plentiful prey for larval and juvenile fish. Abundant zooplankton will support strong recruitment of fish and will lead to abundant predatory fish that control forage fish, including, in the case of pollock, their own juveniles. Piscivorous marine birds and pinnipeds may achieve higher production of young and survival in cold regimes, when there is less competition from large piscivorous fish for coldwater forage fish such as capelin (Mallotus villosus). Piscivorous seabirds and pinnipeds also may be expected to have high productivity in periods of transition from cold regimes to warm regimes, when young of large predatory species of fish are numerous enough to provide forage. The OCH predicts that the ability of large predatory fish populations to sustain fishing pressure will vary between warm and cold regimes.The OCH points to the importance of the timing of ice retreat and water temperatures during the spring bloom for the productivity of zooplankton, and the degree and direction of coupling between zooplankton and forage fish. in the biomass of large piscivorous fish and a concurrent decline in the biomass of forage fish, including age-1 walleye pollock, particularly over the southern portion of the shelf. Populations of northern fur seals (Callorhinus ursinus) and seabirds such as kittiwakes (Rissa spp.) at the Pribilof Islands have declined, most probably in response to a diminished prey base. The available evidence suggests that these changes are unlikely the result of a decrease in total annual new primary production, though the possibility of reduced post-bloom production during summer remains. An ecosystem approach to management of the Bering Sea and its fisheries is of great importance if all o...

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Section: Conceptual Modelsmentioning

confidence: 99%

Climate change and control of the southeastern Bering Sea pelagic ecosystem

Hunt

Stabeno

Walters

et al. 2002

Deep Sea Research Part II: Topical Studies in Oceanography

496

385

View full text Add to dashboard Cite

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“…The hypothesis proposes that, for species with complex life histories, populations are considered to be regulated, to a large degree, by physical oceanographic processes. Copepods in other marine ecosystems show life cycles tuned to the physical characteristics of that system (Man'n 1986, 1988, Conover 1988.…”

Section: Life Cycle O F Calanus Chilensis and Centropages Brachiatusmentioning

confidence: 99%

“…They are particularly important in marine ecosystems dominated by large zooplankton species, e.g. Calanusdominated systems (Runge 1988). There they act as an efficient and direct path for energy transfer to higher trophic levels (Bond 1994, Williams et al 1994.…”

Section: Introductionmentioning

confidence: 99%

Distribution and life cycle of Calanus chilensis and Centropages brachiatus (Copepoda) in Chilean coastal waters:a GIS approach

González¹,

Marı́n²

1998

Mar. Ecol. Prog. Ser.

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Calanus chilensis and Centropages brachiatus are 2 of the most abundant species of copepods (Crustacea) off the Chilean coast. However, knowledge of their life cycle and distribution is fragmentary. We have analysed the distnbution of both species in Chilean coastal waters by means of a Geographic Information System (ARC/INFO). We studied vertically integrated (0 to 100 m) zooplankton samples and ancdlary physical oceanographic data collected during 1989 by the Instituto de Fomento Pesquero, Chlle. Point estimates of abundance and physical data were transformed to a grid format in ARCANFO. We show that both species are abundant within 10 km from shore, and that high abundances further offshore may be interpreted as the result of advection. We also show that both species remain year-round in the upper water column with no evidence of seasonal vertical nugration. We then discuss potential Me cycle mechanisms that might explain their dominance in the coastal area of the Humboldt Current ecosystem.

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“…Copepods play an important role in the vitality of fish populations (Runge, 1988). Discerning the various biological, physical and chemical factors that affect temporal and spatial variations in abundance and distribution, as well as the fecundity, growth, survival and mortality rates of copepods, is thus a basic objective of zooplankton ecology (Poulet et al, 1995;Miralto et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Üstün¹,

Bat²

2014

Turk. J. Fish. Aquat. Sci.

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The egg production rate (EPR) of Acartia (Acartiura) clausi was measured between January and December 2008 in Sinop Inner Harbor (southern Black Sea). During the study period, EPR were found to be generally low varying between 2.04±0.43 (20 October) and 19.41±1.73 eggs/female.day (26 March). The mean EPR was recorded 8.62±1.02 eggs/female.day. The results have shown that water temperature and chlorophyll-a concentration are factors that affect the EPR of A. clausi; however, these factors are not always sufficient alone to explain the EPR in Sinop Inner Harbor.

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Should we expect a relationship between primary production and fisheries? The role of copepod dynamics as a filter of trophic variability

Cited by 164 publications

References 39 publications

Climate change and control of the southeastern Bering Sea pelagic ecosystem

Climate change and control of the southeastern Bering Sea pelagic ecosystem

Distribution and life cycle of Calanus chilensis and Centropages brachiatus (Copepoda) in Chilean coastal waters:a GIS approach

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