Distribution of dominant calanoid copepod species in the Greenland sea during late fall

Hirche, Hans-Jiirgen

doi:10.1007/bf00239687

Cited by 164 publications

(103 citation statements)

References 31 publications

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“…C. sinicus (Huang et al 1993) have a continuous reproduction cycle and do not go into diapause, whereas a proportion of C. pacificus californicus does rest at these latitudes. However, in C. finmarchicus from the Greenland Sea, with a supposed annual generation (McLelland 1967, Hirche 1991, a proportion of 38% quadritheks was found in March, similar to observations in North Norwegian fjords.…”

Section: Distribution Of Quadrithek Femalessupporting

confidence: 77%

Sex change and female dimorphism in Calanus finmarchicus

Svensen¹,

Tande²

1999

Mar. Ecol. Prog. Ser.

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ABSTRACT. Adult females were examined from November until spring in northern Norway (30" N) to determine the fraction with the quadrithek and the fraction with the trithek setal pattern on the antennule. The quadrithek (Q) pattern is a male characteristic in which odd numbered, proximal segments carry 2 aesthetascs and 2 setae; the trithek (T) pattern has 1 aesthetics on all antennular segments. The frequency of quadrithek females (%Q = 100 X [Q/T]) varied with season. It peaked at 38% in February, declining to 25 % in March. Higher proportions appeared early, consistently between years, i.e. higher proportions were found among the first females emerging from the stock of resting copepodids. In light of the hypothesis of Fleminger (1985; Mar Biol 88:273-294) that females w t h the quadrithek pattern result from sex switching by genetic males, we tested whether %Q in newly moulted females could be altered by separate exposure of the maturing CVs to adult males or females. The experiments were run with specimens from Gratsund during the last 3 wk prior to moulting of CVs in the field. Of females not exposed to adults as CVs, 35% had quadrithek patterns, while those exposed to adult males or females produced 33 and 37% quadritheks respectively. In these experiments, presence of adult Calanus finmarchicus (Gunnerus) did not influence the proportion of females with male characteristics. No evidence for sex specific pheromones was found and therefore the stimulus for sex change was not revealed. A possible influence of the environment on C. finmarchicus sex determination (ESD) is suggested and discussed.

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Section: Distribution Of Quadrithek Femalessupporting

confidence: 77%

Sex change and female dimorphism in Calanus finmarchicus

Svensen¹,

Tande²

1999

Mar. Ecol. Prog. Ser.

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“…3. Numerals adjacent to pie charts refer to sample numbers in Table 1 that water of at least 100 m depth may be required (see Hirche 1991, Conover & Sieferd 1993, Ashjian et al 2003. If this is the case, the Chukchi shelf, which is <100 m deep, does not provide suitable overwintering habitat.…”

Section: Discussionmentioning

confidence: 99%

“…Egg production begins in spring as animals ascend from depth to graze on ice algae and phytoplankton (Conover 1988, Hirche 1998. Observations suggest that water of at least 100 m depth may be required for overwintering (see Hirche 1991, Conover & Sieferd 1993, Ashjian et al 2003, and it is not known whether overwintering can occur successfully in water <100 m deep.…”

Section: Flow Through Bering Strait Into the Western Arcticmentioning

confidence: 99%

Penetration of Pacific zooplankton into the western Arctic Ocean tracked with molecular population genetics

Nelson¹,

Carmack²,

McLaughlin³

et al. 2009

Mar. Ecol. Prog. Ser.

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“…200 µm) has lead to overestimation of the importance of large species like Calanus. We sampled the copepod community with small mesh size nets (50 µm), and still species of Calanus comprised up to 99% of the biomass, which is typical for Arctic areas during spring (Hirche 1991, Madsen et al 2008a. The copepods remained abundant in the upper 100 m throughout the study and did not decrease until early July.…”

Section: Hydrography and Plankton Successionmentioning

confidence: 99%

Succession and fate of the spring diatom bloom in Disko Bay, western Greenland

Dünweber¹,

Swalethorp²,

Kjellerup³

et al. 2010

Mar. Ecol. Prog. Ser.

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Phytoplankton and copepod succession was investigated in Disko Bay, western Greenland from February to July 2008. The spring phytoplankton bloom developed immediately after the breakup of sea ice and reached a peak concentration of 24 mg chl a m -3 2 wk later. The bloom was analyzed during 3 phases: the developing, the decaying, and the post-bloom phases. Grazing impact by the copepod community was assessed by 4 methods; gut fluorescence, in situ faecal pellet production, and egg and faecal pellet production from bottle incubations. Calanus spp. dominated the mesozooplankton community. They were present from the initiation of the bloom but only had a small grazing impact on the phytoplankton. Consequently, there was a close coupling between the spring phytoplankton bloom and sedimentation of particulate organic carbon (POC). Out of 1836 ± 180 mg C m -2 d -1 leaving the upper 50 m, 60% was phytoplankton based carbon (PPC). The composition and quality of the sedimenting material changed throughout the bloom succession from PPC dominance in the initial phase with a POC/PON ratio close to 6.6 to a dominance of amorphous detritus with a higher POC/PON ratio (>10) in the postbloom phase. The succession and fate of the phytoplankton spring bloom was controlled by nitrogen limitation and subsequent sedimentation, while grazing-mediated flux by the Calanus-dominated copepod community played a minor role in the termination of the spring bloom of Disko Bay.

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Distribution of dominant calanoid copepod species in the Greenland sea during late fall

Cited by 164 publications

References 31 publications

Sex change and female dimorphism in Calanus finmarchicus

Sex change and female dimorphism in Calanus finmarchicus

Penetration of Pacific zooplankton into the western Arctic Ocean tracked with molecular population genetics

Succession and fate of the spring diatom bloom in Disko Bay, western Greenland

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