Abundance and distribution of Calanus finmarchicus on the Georges Bank during 1995 and 1996

Durbin, Edward G.; Garrahan, Peter; Casas, Maria C.

doi:10.1006/jmsc.2000.0974

Cited by 59 publications

(63 citation statements)

References 32 publications

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“…The GOM serves as an important source for seed populations of zooplankton advected onto GB (Durbin et al , 2000. Thus, zooplankton production processes during the winter in the GOM will have effects on GB.…”

Section: Discussionmentioning

confidence: 99%

“…Bigelow 1926, Fish & Johnson 1937, Sherman et al 1983, Meise et al 1990, Meise & O'Reilly 1996, Jossi & Kane 2000. The dominant copepod in the GOM during winter and spring, Calanus finmarchicus, returns to the surface after a resting period in early winter and begins reproduction , Durbin et al 2000. Based on studies in other regions and in the laboratory (Campbell et al 2001a,b) we would expect growth and reproduction of C. finmarchicus to be limited by the low food concentrations normally present at this time prior to the spring bloom.…”

Section: Introductionmentioning

confidence: 99%

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Interannual variation in phytoplankton blooms and zooplankton productivity and abundance in the Gulf of Maine during winter

Durbin¹,

Campbell²,

Casas³

et al. 2003

Mar. Ecol. Prog. Ser.

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An anomalous winter phytoplankton bloom was observed across the central Gulf of Maine during a winter cruise in late February 1999, but not during a similar mission to the same region in late February 2000. During the cruise in 1999, 0 to 40 m mean chl a concentrations were >2 µg l -1 , while in 2000 total chl a concentrations were <1.0, and > 5 µm size fractions were < 0.5 µg l -1. The presence of the bloom in 1999 could not be explained in terms of the critical depth hypothesis given conditions present at the time of the bloom. The large amount of colder, lower-salinity Scotian Shelf water present at the surface of the central Gulf of Maine in 1999 may have provided conditions suitable for the initiation of the bloom earlier during the winter. The presence of the winter bloom had a major effect on higher trophic levels. Zooplankton were >10 × more abundant in 1999 and included species typically not present in the central Gulf during winter. All developmental stages of planktonic copepods were present, including large numbers of older copepodid stages of species such as Calanus finmarchicus, indicating that the bloom had been proceeding for some time. RNA:DNA ratios of surface C. finmarchicus stage C5 and adult females were at or near maximum temperature-dependent values in 1999, but were considerably reduced in 2000. Egg production rates of C. finmarchicus were high in1999 but reduced in 2000. Both showed a curvilinear relationship with chl a. Analysis of gonads of females of other copepod species indicate similar between-year differences in reproductive rates. We suggest that the presence of the winter bloom in the central Gulf of Maine allows an extra generation of C. finmarchicus and other copepods to develop, leading to a buildup of the population during winter. This will have significant effects on downstream regions such as Georges Bank, which depend on re-supply from the Gulf of Maine.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interannual variation in phytoplankton blooms and zooplankton productivity and abundance in the Gulf of Maine during winter

Durbin¹,

Campbell²,

Casas³

et al. 2003

Mar. Ecol. Prog. Ser.

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“…A pump system with 0.035 to 0.050 mm nets was used to sample nauplii (Durbin et al, 2000). Analyses for dry weights were made at 12 stations on the…”

Section: Mesozooplanktonmentioning

confidence: 99%

“…From data on copepod nauplii densities (E.G. Durbin, unpublished; see also Durbin et al, 2000;Lynch et al, 2001) the mean values (ranges) for winter (Jan-April) and spring (May-June) are 2.1 μg C.l -1…”

Section: Carnivorous Zooplanktonmentioning

confidence: 99%

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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“…The ecological success of C. finmarchicus is facilitated by its ability to avoid adverse seasonal conditions and high predation risk (Kaartvedt, 1996) by vertically migrating to depth and entering a facultative diapause during the last juvenile stages (typically stage C5) (Hirche, 1996). In the Gulf of Maine, a portion of the C. finmarchicus population enters into this diapause period during the warm spring and summer months and exits during mid to late winter to molt into adults; however, some C5 juveniles skip diapause and proceed to molt into adults, reproduce, and spawn another generation (Durbin et al, 2000;Durbin et al, 1997). The appropriate translation of environmental cues into the physiological changes required for diapause in C. finmarchicus suggests the involvement of complex but flexible internal regulatory processes.…”

Section: Introductionmentioning

confidence: 99%

Heat shock protein expression during stress and diapause in the marine copepod Calanus finmarchicus

Aruda

Baumgartner

Reitzel

et al. 2011

Journal of Insect Physiology

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Graphical Abstract Research HighlightsWe identified 8 heat shock proteins (3 small Hsps, 4 Hsp70's, Hsp90). Hsp70a (cytosolic clade) and Hsp21, and Hsp22 were induced by handling stress. Hsp70a expression was elevated in shallow, active animals. Hsp22 expression was elevated in deep, diapausing animals. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 *Research highlights

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Abundance and distribution of Calanus finmarchicus on the Georges Bank during 1995 and 1996

Cited by 59 publications

References 32 publications

Interannual variation in phytoplankton blooms and zooplankton productivity and abundance in the Gulf of Maine during winter

Interannual variation in phytoplankton blooms and zooplankton productivity and abundance in the Gulf of Maine during winter

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

Heat shock protein expression during stress and diapause in the marine copepod Calanus finmarchicus

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