Zooplankton Dynamics During FLEX ‘76

Krause, Michael; Trahms, J.

doi:10.1007/978-3-642-68838-6_42

Cited by 30 publications

(27 citation statements)

References 46 publications

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“…Furthermore, although water bottle samples might reflect small-scale patchiness in the ocean, vertically integrated values from 4 profiles per day were averaged here, serving to considerably reduce the effects of small-scale variability. Krause & Trahms (1983) give a detailed account of zooplankton sampling at the central station during FLEX 1976.…”

Section: Methodsmentioning

confidence: 99%

“…We digitized naupliar data from published figures (Krause & Trahms 1983). Zooplankton abundance data were integrated over depth and pooled into daily averages.…”

Section: Methodsmentioning

confidence: 99%

“…This study sought to understand spring bloom dynamics in the northern North Sea, in a region where the influence of horizontal advection is relatively small. Some of the important topics that have been addressed include spring succession of the plankton community (Krause & Radach 1980, Williams & Lindley 1980a, temporal activity and feeding patterns of zooplankton (Daro 1980, Fransz & van Arkel 1980, horizontal distribution of zooplankton biomass (Solow & Steele 1995), habitat choice and patterns of vertical migrations (Krause & Trahms 1982, Krause & Radach 1989, and aspects of zooplankton population dynamics (Lindley & Williams 1980, Williams & Lindley 1980b, Krause & Trahms 1983. Reliable techniques for estimating zooplankton mortality rates were not available to these authors; hence, it has not been possible to include quantitative considerations about mortality until now.…”

Section: Introductionmentioning

confidence: 99%

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Stage-specific mortality of Calanus finmarchicus, Pseudocalanus elongatus and Oithona similis on Fladen Ground, North Sea, during a spring bloom

Eiane

Ohman²

2004

Mar. Ecol. Prog. Ser.

110

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We used Woods Population Surface Method to estimate stage-specific mortality rates for populations of Calanus finmarchicus, Pseudocalanus elongatus, and Oithona similis from abundance data obtained during the Fladen Ground Experiment (FLEX 1976) in the northern North Sea. Temperatures from the day and night depth distributions of each developmental stage were used to force temperature functions for the duration of developmental stages. In addition, we considered the influence of potential food-limitation of development, which had only minor effects on the mortality estimates. We show that the risk of mortality changes substantially over the life span of the animals, with notable differences among species. O. similis, in particular, shows negligible losses after naupliar stages 1 and 2, which may account for its numerical dominance in many ocean regions. Differences among taxa are poorly explained by allometry alone and are instead related to species-and stagespecific differences in behavior. The vertical migration behavior of late developmental stages of C. finmarchicus (i.e. their choice of habitat) might help to reduce mortality risk.

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Section: Methodsmentioning

confidence: 99%

“…We digitized naupliar data from published figures (Krause & Trahms 1983). Zooplankton abundance data were integrated over depth and pooled into daily averages.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stage-specific mortality of Calanus finmarchicus, Pseudocalanus elongatus and Oithona similis on Fladen Ground, North Sea, during a spring bloom

Eiane

Ohman²

2004

Mar. Ecol. Prog. Ser.

110

View full text Add to dashboard Cite

show abstract

“…The phytoplankton bloom had not yet developed in the northern North Sea during the present study. However, due to the large overwintering population of Calanus finmarchius in this region (Krause & Thrams 1983) which mature several months before the spring bloom ( Tande & Hopkins 1981 and Table 4) and the higher temperature, we expect a large grazing impact on the bloom as shown by Williams & Lindley (1980). This would result in an input of carbon to the benthos of about one third of that in the southern region, assuming the same primary production during the bloom and that about 33 O/O (Kimboe et al 198513) of the ingested carbon is channelled to the bottom as faeces.…”

Section: May/june Cruisementioning

confidence: 99%

“…These species form large overwintering populations which can efficently exploit the spring bloom (Krause & Thrams 1983).…”

Section: Copepod Grazing Impact On the Spring Bloommentioning

confidence: 99%