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  • 1
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    Possible processes of nutritive adaptations for zooplankton : a demonstration on Artemia (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-25
    Description: The ingestion rate and the resulting assimilation calculated by means of a law taking into account activities of the digestive enzymes (amylase and trypsin) on the carbohydrates and proteins ingested, are determined in two experiments on Artemia. They are fed the same species of phytoplankton (Tetraselmis suecica), at the same concentration but with two chemical compositions. In one experiment, the cells are rich in carbohydrates and poor in proteins, and in the second one they are poor in carbohydrates, rich in proteins. Different observed ingestion rates induce a balance in proteins, and a large difference in the carbohydrates ingested. When digestive enzymes are taken into account, the assimilated carbohydrates and proteins are similar (explaining the similitude of the growth rate observed). The assimilation yield study shows that digestive enzymes induce a better digestion of chemical compounds in low concentrations in the food. That could correspond to a regulation of assimilation as a function of requirements of Artemia. Requirements would be the first internal factor that regulates the nutritional behavior. So two processes are possible for Artemia to obtain the sufficient quantity of food: regulation of ingestion rate, probably depending also on olfactory mechanisms, and regulation of assimilation by the way of digestive enzymes. The importance of these processes is discussed as a function of environmental conditions.
    Type: Article , NonPeerReviewed
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  • 2
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    POSEIDON Reise 72 [POS72] Fahrtbericht (1981)
    Institut für Meereskunde
    In:  Institut für Meereskunde , Kiel, 20 pp.
    Details
    Publication Date: 2015-07-20
    Description: Die 72. Reise der FS Poseidon fand zwischen dem 9. und 13. März 1981 im Skagerrak statt.
    Type: Report , NonPeerReviewed
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  • 3
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    Eulerian current measurements from the North East Atlantic : march 1982 - october 1983 ; a data report (1984)
    Institut für Meereskunde
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 127 . Institut für Meereskunde, Kiel, Germany, 99 pp.
    Details
    Publication Date: 2012-10-09
    Type: Report , NonPeerReviewed
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  • 4
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    Some Eulerian current measurements and XBT-sections from the North East Atlantic October 1980 - March 1982 : a data report (1983)
    Institut für Meereskunde
    In:  Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel, 114 . Institut für Meereskunde, Kiel, Germany, 145 pp.
    Details
    Publication Date: 2017-05-05
    Type: Report , NonPeerReviewed
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  • 5
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    Maximal enzyme activities in certain polychaetes in relation to their behaviour and ecology (1981)
    Institut für Meereskunde
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    Publication Date: 2022-05-23
    Type: Article , NonPeerReviewed
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  • 6
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    A study of nitrogen excretion in the marine copepod Temora longicornis (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-23
    Description: Frequent collections were made of the marine planktonic copepod Temora longicornis and a series of measurements made to determine the level of nitrogen excretion in this copepod. An algal diet consisting of the marine diatoms Skeletonema and Thalassiosira labelled with 14C was provided in the laboratory. Both excreted ammonia nitrogen and amino nitrogen were measured, as was the total nitrogen in the copepods. The copepods were kept for a maximum of one day and excretion measured one hour after feeding. Oxygen consumption was measured as an indicator of metabolic rate and as a basis for calculations of the O:N ratio and estimations of the efficiency of nitrogen utilisation.
    Type: Article , NonPeerReviewed
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  • 7
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    The composition and bacterial utilization of DOC released by phytoplankton (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-23
    Description: The primary production, quantity and molecular weight distribution of DOC released by phytoplankton, and the subsequent utilization and transformation of these compounds by bacteria in an estuary was studied. High primary production rate and DOC release was observed. The amount and composition of DOC released by phytoplankton aried with time and changing algal population. Low molecular weight products with MW less than 500, fraction with MW 10000 - 30000, and high molecular weightcompounds greater than 300000 dominated in the algal DOC. Bacteria utilized a significant portion of released DOC. The role of bacteria in the transformation of released DOC by algae is discussed.
    Type: Article , NonPeerReviewed
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  • 8
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    Effects of epibenthic macropredators on community structure in an eutrophicated shallow water area, with special reference to food consumption by the common goby Pomatoschistus microps (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-23
    Description: Field manipulative cage experiments were performed on an unvegetated shallow water mudflat in the eutrophicated inner Oslo fjord. Exclosure and enclosure cages each covering an area of 0.6 m2, were maintained on the mudflat to protect infauna from epibenthic macropredators in general and for exposing the infauna to different densities of the common goby, Pomatoschistus microps, a common predator in the area. Predation effects were determined by comparing faunal composition and abundance inside and outside the cages after 2 1/2 months. Irrespective of the number of gobies in the cages only minor differences in faunal composition and abundance were found between cage and control. lt is therefore concluded that epibenthic macropredators in general and P. microps in particular do not crop infauna to an extent sufficient to alter faunal composition and to reduce abundance discernibly.
    Type: Article , NonPeerReviewed
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  • 9
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    Diel variations in some important phytoplankton parameters during a 24 hours sampling period in Balsfjorden, Tromsø and Skjomentfjorden, Nordland, North Norway (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-23
    Description: Every fourth hour in 24 h periods measurements were made of temperature, salinity, plant nutrients, incident radiation at three m depth, sub-surface light extinction, chlorophyll a, phaeophytin, particulate carbon and nitrogen, cell counts, zooplankton dry weight biomass, in situ primary production (14C), incubator carbon assimilation (14C), heterotrophic activity (14C glucose assimilation), and horizontal variation in chlorophyll a over one nautical mile. The marked variations in all parameters were probably generated by the combined effects of wind-driven circulation of water masses in the fjord and phytoplankton patches. This study stresses the presence of spatial and temporal changes in fjords, and that data conducted from one or few stations should be interpreted with care.
    Type: Article , NonPeerReviewed
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  • 10
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    Digestive enzymes of copepodids and adults of Calanus finmarchicus and C. helgolandicus in relation to particulate matter (1981)
    Institut für Meereskunde
    Details
    Publication Date: 2022-05-24
    Description: During spring and in summer the digestive enzymes trypsin and amylase of copepodids and adults of Calanus finmarchicus and C. helgolandicus were studied in a Swedish fjord in relation to various parameters of particulate matter. Regulation mechanisms of digestive enzymes varied with stage of development and physiological condition. In the stages studied three types of regulation were found: In copepodid stages Cl/II trypsin remained constant at a rather high activity irrespective of variations in amylase activity; in CIII-CV and males trypsin and amylase were strongly correlated; in females both enzymes varied independently of each other. Digestive enzymes of CV, females and males of the overwintering generation, were generally very low and did not correlate with any of the food parameters. The digestive enzyme activities were compared with concentrations of chlorophyll a, particulate carbon, nitrogen and carbohydrates at different depths. Amylase of stages CI-CV and adult males and trypsin of CIII-CV and males correlated significantly with carbohydrate concentrations. On the other hand amylase of adult females gave significant correlations with chlorophyll a and carbon. It is suggested that this difference between females and the other stages indicates different food selection.
    Type: Article , NonPeerReviewed
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