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  • Other Sources  (9)
  • Articles (OceanRep)  (9)
  • IFM-GEOMAR
  • ASLO (Association for the Sciences of Limnology and Oceanography)
  • American Meteorological Society
  • Springer Nature
  • 1990-1994  (9)
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  • Other Sources  (9)
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  • Articles (OceanRep)  (9)
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  • 1
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    Factors controlling the formation of marine snow and its sustained residence in surface waters (1992)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 37 (1). pp. 63-76.
    Details
    Publication Date: 2014-01-30
    Description: The formation of large marine snow macroflocs and stringers was monitored at a fixed station in the southern North Sea. During an 18-month investigation, large marine snow floes occurred in the water column on nine occasions for periods lasting between 5 and 16 d. Their formation coincided with both high phytoplankton biomass and low windspeeds. Retention of marine snow in the surface layer was related to slow sinking, neutral buoyancy, and rising of the large floes. Applying a specially developed instrument showed buoyancy to be caused by gas bubbles incorporated in the floes. Marine snow flotation coincided with periods of oxygen supersaturation in the water column, suggesting that oxygen production could be responsible for gas bubble formation within the floes. Disappearance of the large marine snow floes from the surface layer coincided with drastic increases in windspeed, indicating that enhanced wind-induced turbulent mixing in the surface layer could have resulted in the breakup of these floes. Formation and disappearance of marine snow had a marked influence on the light regime in the water.
    Type: Article , PeerReviewed
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  • 2
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    Nitrate use by plankton in the eastern subtropical North Atlantic, March-April 1989 (1990)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 35 . pp. 1781-1788.
    Details
    Publication Date: 2018-06-25
    Description: Nitrate concentration was measured in seawater samples from the euphotic zone at the beginning and end of 12-h, daytime, in situ incubations. The changes in concentration are considered to be measurements of new production. During periods of 2-3 weeks in March-April 1989, important time scales for NO3- input to the euphotic zone (i.e. residence times) and new production were approximately 26 d at 18-degrees-N, 31-degrees-W and approximately 10 d near 33-degrees-N, 21-degrees-W. The average rate of NO3- use in the two areas was 2.63 and 0.62 mmol N m-2 (12 h)-1, or, in carbon equivalents 209 and 49 mg C m-2 d-1, respectively. These values bracket the large-scale estimate by Jenkins of new production in the nearby beta triangle of 150 mg C m-2 d-1.
    Type: Article , PeerReviewed
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  • 3
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    Phosphorus-limited Daphnia: Intraspecific facilitation instead of competition (1992)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 37 (5). pp. 966-973.
    Details
    Publication Date: 2018-06-25
    Description: P-limited chemostat cultures of the green alga Scenedesmus acutus were inoculated with the herbivorous zooplankter Daphnia galeata after steady state had been reached. At low dilution rates (up to 0.5 d-l) and consequently low P content of the food algae (P: C 〈 0.0011) Daphnia could not grow. At higher dilution rates (from 0.55 d-l upward) and higher P content ofthe food, Daphnia developed dense populations which were able to reduce algal biomass more than IO-fold. This reduction was accompanied by an increase in the P content of the algae which gave rise to increased birth rates of Daphnia. The birth rates of P-limited Daphnia depended on algal cell quotas in a saturating fashion which was mathematically similar to Droop’s growth equation. During P limitation the birth rates of Daphnia were positively correlated to population density, which suggests intraspecific facilitation instead of competition.
    Type: Article , PeerReviewed
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  • 4
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    Foraging behaviour of emperor penguins as a resource detector in winter and summer (1992)
    Springer Nature
    In:  Nature, 360 (6402). pp. 336-339.
    Details
    Publication Date: 2021-04-22
    Description: The emperor penguin (Aptenodytes forsteri), which feeds only at sea, is restricted to the higher latitudes of the antarctic sea-ice habitat1–3. It breeds on the winter fast ice when temperatures are−30 °C and high winds are frequent3. Assuming entirely the task of incubating the single egg, the male fasts for about 120 days in the most severe conditions. When it is relieved by the female around hatching time, the distance between the colony and the open sea may be 100km or more4,5, but where emperors go to forage at that time or during the summer is unknown. The polynias are areas of open water in sea-ice and during winter, with the under-ice habitats at any time of the year, they are among the most difficult of all Antarctic areas to sample. Here we monitor by satellite the routes taken by emperor penguins for foraging and compare them with satellite images of sea-ice. Winter birds walking over fast ice travelled up to 296 km to feed in polynias, whereas those swimming in light pack-ice travelled as far as 895km from the breeding colony. One record of diving showed that although most dives are to mid-water depths, some are near the bottom. Obtaining such detailed information on foraging in emperor penguins means that this bird now offers a unique opportunity to investigate the Antarctic sea-ice habitat.
    Type: Article , PeerReviewed
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  • 5
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    The relationships between resource ratios and phytoplankton composition during the spring period in five North German lakes (1993)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 38 . pp. 846-856.
    Details
    Publication Date: 2019-07-29
    Description: Phytoplankton species composition and the availability of potentially limiting resources were investigatcd in five northern German lakes (Suhrer See, Kellersee, Behler See, PluBsee, and Krummsee) during spring 1988. Species composition was related to resource ratios to test Tilman’s resource-ratio hypothesis. The clearest results were obtained for Aulacoseira spp. Both the time-courses within the lakes and the comparison among the lakes suggest a strong tendency of this genus to become dominant at high Si : light ratios. Fragilariaceae occupied the next position on the Si : light gradient. Such conditions permitted them to become important even when Si : P ratios were quite low. With the onset of stratification diatoms were replaced by flagellates.
    Type: Article , PeerReviewed
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  • 6
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    The impact of light intensity and daylength on silicate and nitrate competition among marine phytoplankton (1994)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 39 (7). pp. 1680-1688.
    Details
    Publication Date: 2018-06-25
    Description: I tested the extent to which differences in light supply could influence the outcome of nutrient (Si and N) competition between marine phytoplankton. Competition experiments were performed with 11 species of marine phytoplankton at Si: N ratios from 16 to 124 : 1, light intensities from 28 to 225 µmol quanta m−2 s−1, and three different daylengths. Thus, light supply was the composite result of two components: photoperiod and intensity. Diatoms were dominant competitors at higher Si: N ratios, nonsiliceous flagellates at lower ones. Light had no impact on the transition from flagellate to diatom dominance along the Si: N gradient. However, species within those groups were separated along the light gradient. Contrary to theoretical expectations, changes in light intensity and changes in daylength led to similar shifts in species dominance. Therefore, it was possible to describe the light climate by the integral parameter “daily light dose.”
    Type: Article , PeerReviewed
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  • 7
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    Phytoplankton competition in Plußsee: a field test of the resource-ratio hypothesis (1993)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 38 (4). pp. 838-845.
    Details
    Publication Date: 2018-06-25
    Description: During a 10-month study in Plusssee Si, N, and light were found as potentially limiting resources for phytoplankton growth rates. Therefore, three ratios of essential resources (Si : N, Si : light, N : light) and one ratio of substitutable resources (nitrate: ammonium) were compared to changes in species composition to test the hypothesis that the seasonal change of phytoplankton species composition was a response to changing resource ratios. The relationship was analyzed by a rank correlation analysis between the relative contribution of individual species to total biomass and resource ratios. Allowance was made for time lags between changes in resource ratios and changes in relative biomass. Of 16 species, 14 showed a significant response to at least one resource ratio. Time lags ranged from 0 to 6 weeks. Most species seemed to be favored either by minimal or maximal ratios; optimal ratios in the middle of the range were rare.
    Type: Article , PeerReviewed
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  • 8
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    A comment on "Nutrient status and nutrient competition of phytoplankton in a shallow, hypertrophic lake" (Sommer) (1990)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 35 (3). pp. 778-779.
    Details
    Publication Date: 2018-06-25
    Type: Article , NonPeerReviewed
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  • 9
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    Resource ratios or absolute concentrations: a reply to the comment by Prairie (1990)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 35 . pp. 779-780.
    Details
    Publication Date: 2018-06-25
    Type: Article , PeerReviewed
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