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Plankton of the Fladen Ground during FLEX 76. 2. Population dynamics and production of Thysanoessa inermis (Crustacea: Euphausiacea) Lindley, J.A.; Williams, R. (1980). Plankton of the Fladen Ground during FLEX 76. 2. Population dynamics and production of Thysanoessa inermis (Crustacea: Euphausiacea). Mar. Biol. (Berl.) 57(2): 79-86. https://dx.doi.org/10.1007/BF00387373 In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793

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Beschikbaar in	Auteurs
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Trefwoorden

Aquatic communities > Plankton Chemical elements > Nonmetals > Carbon Distribution > Geographical distribution > Vertical distribution Population dynamics Reproduction > Sexual reproduction Crustacea [WoRMS]; Euphausiacea [WoRMS]; Thysanoessa Brandt, 1851 [WoRMS]; Thysanoessa inermis (Krøyer, 1846) [WoRMS] Marien/Kust

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Auteurs		Top
Lindley, J.A. Williams, R.

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Abstract

Samples taken in the northern North Sea with the Continuous Plankton Recorder (CPR), the Undulating Oceanographic Recorder (UOR) and the Longhurst-Hardy Plankton Recorder (LHPR) during the Fladen Ground Experiment in 1976 (FLEX 76) are used to describe the vertical distribution and population dynamics of Thysanoessa inermis (Krøyer) and to provide estimates of the production and carbon budget of the population from 19th March to 3 June 1976. Spawning occurred in late April and early May, in near synchronisation with the start of the spring bloom of phytoplankton. Eggs, nauplii and calyptopes reached maximum abundance in succession, and furciliae were numerous when sampling ceased in early June. Adults increased in length from a mean of 12.1 mm in mid-March to 17.5 mm in early June and the estimated production was 2.40 mg m-3 over the 74 d period. Total carbon ingested by the population of T. inermis was estimated to be 10 mg C m-2 d-1 in the upper 100m which was only 1.5% of the daily primary production of 0.68 gC m-2 measured over the FLEX period 26 March to 4 June 1976. The grazing by T. inermis on the phytoplankton population was assumed to have little effect on the control and depletion of the spring phytoplankton bloom during FLEX 77.

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