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  • 1
    Online Resource
    Online Resource
    Temperature and stable isotope variations in different water masses from the Alboran Sea (Western Mediterranean) between 250 and 150 ka (2008)
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    In: Geochemistry, geophysics, geosystems, Hoboken, NJ : Wiley, 2000, 9(2008), 10, 1525-2027
    In: volume:9
    In: year:2008
    In: number:10
    In: extent:14
    Description / Table of Contents: Mg/Ca, Sr/Ca, and stable isotope measurements have been performed on tests from the planktonic foraminifers Globigerinoides ruber (white), Globigerina bulloides, and Neogloboquadrina pachyderma (right coiling) in samples from Ocean Drilling Program site 977A in the Alboran Sea (Western Mediterranean). The evolution of different water masses between 250 and 150 ka is described. Warm substages were characterized by strong seasonality and thermal stratification of the water column. By contrast, less pronounced seasonality and basin stratification seem to prevail during cold substages. Several periods of stratification due to the low salinity of the upper water mass occurred during the formation of organic-rich layers and also during a possible Heinrich-like event at 220 ka. The three foraminifer species studied show a common and large shell Sr/Ca variability in short timescales, suggesting changes in the global ocean Sr/Ca ratio as one of the main causes of variations in shell composition.
    Type of Medium: Online Resource
    Pages: 14 , graph. Darst
    ISSN: 1525-2027
    DOI: 10.1029/2007GC001906
    Language: English
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  • 2
    Online Resource
    Online Resource
    Foraminiferal test abnormalities in the western Baltic Sea (2008)
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    In: Journal of foraminiferal research, Alexandria, Va. : GeoScienceWorld, 1971, 38(2008), 4, Seite 318-336, 0096-1191
    In: volume:38
    In: year:2008
    In: number:4
    In: pages:318-336
    Description / Table of Contents: Abnormal tests were commonly found in recent benthic foraminiferal assemblages in two fjords of the Kiel Bay, the western Baltic Sea. We assessed 18 different types of abnormalities, which were classified into five groups: chamber, apertural, umbilical, coiling and test abnormalities. In both fjords, test abnormalities are over-represented in Ammonia beccarii and under-represented in Elphidium excavatum subspecies compared to their average proportions in the living assemblages. We found two species-specific abnormality types that occurred only in Ammonia beccarii: a bulla-like chamber covering the umbilicus and spiroconvex tests. In the outer Kiel and Flensburg Fjords, the highest frequencies of abnormal tests were associated with occasional salt-rich, bottom-water inflows from the Belt Sea. Based on the predominance of megalospheric specimens of living foraminifera, it is suggested that coincidence of salinity changes with a reproduction period might be harmful, especially for young individuals, leading to development of abnormal tests. On the other hand, pollution by heavy metals led to higher percentages of abnormal tests in the inner parts of both fjords. Our data show different relationships between abnormal tests and heavy metals in both fjords due to different hydrographical conditions. Tests of Ammonia beccarii found in the Gelting Bay, the Flensburg Fjord, showed traces of dissolution and development of double tests. Such specific abnormal tests mirror the peculiar environmental setting characterized by changes in salinity and enhanced sediment redeposition. It is concluded that abnormal tests as an indicator of environmental pollution have to be used cautiously in areas with strong environmental instability.
    Type of Medium: Online Resource
    ISSN: 0096-1191
    DOI: 10.2113/gsjfr.38.4.318
    Language: English
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  • 3
    Online Resource
    Online Resource
    Memorial to Gerhard Friedrich Lutze (1932 - 2009) (2009)
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    In: Journal of foraminiferal research, Alexandria, Va. : GeoScienceWorld, 1971, 39(2009), 4, Seite 361-363, 0096-1191
    In: volume:39
    In: year:2009
    In: number:4
    In: pages:361-363
    Type of Medium: Online Resource
    Pages: Ill
    ISSN: 0096-1191
    URL: http://jfr.geoscienceworld.org/cgi/content/extract/39/4/361
    Language: English
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  • 4
    Article
    Article
    Foraminiferal response to environmental changes in Kiel Fjord (SW Baltic Sea) (2008)
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    In: Polovodova, Irina, 1980 -, Benthic foraminifera & environmental change in the south-western Baltic Sea, 2008, (2008), Seite 4-20
    In: year:2008
    In: pages:4-20
    Type of Medium: Article
    Pages: Ill., Kt.
    Language: English
    Note: Auch in: eEarth Discussions, 2.2007, p. 191 - 217 u.d.T.: Environmental response of living benthic foraminifera in Kiel Fjord, SW Baltic Sea
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  • 5
    Article
    Article
    Foraminiferal response to environmental changes in Kiel Fjord, SW Baltic Sea (2008)
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    In: Nikulina, Anna, 1980 -, The imprint of anthropogenic activity versus natural variability in the Fjords of Kiel Bight; evidence from sediments, Kiel, 2008, (2008), Seite 5-22
    In: year:2008
    In: pages:5-22
    Type of Medium: Article
    Pages: Ill. Kt.
    Language: English
    Note: Auch in: eEarth, 3.2008, p. 37 - 49
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  • 6
    Article
    Article
    Test abnormalities of recent benthic foraminifera in the western Baltic Sea (2008)
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    In: Polovodova, Irina, 1980 -, Benthic foraminifera & environmental change in the south-western Baltic Sea, 2008, (2008), Seite 39-62
    In: year:2008
    In: pages:39-62
    Type of Medium: Article
    Pages: Ill., Kt.
    Language: English
    Note: Submitted to Journal of foraminiferal research
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  • 7
    Article
    Article
    The benthic foraminiferal response to the 2004 spring bloom in the western Baltic Sea (2007)
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    In: Marine micropaleontology, Amsterdam [u.a.] : Elsevier Scientific Publ. Co., 1976, 65(2007), 1/2, Seite 78-95, 0377-8398
    In: volume:65
    In: year:2007
    In: number:1/2
    In: pages:78-95
    Type of Medium: Article
    Pages: graph. Darst., Kt
    ISSN: 0377-8398
    Language: English
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  • 8
    Online Resource
    Online Resource
    The benthic foraminiferal response to the 2004 spring bloom inthe western Baltic Sea (2007)
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    In: Marine micropaleontology, New York, NY [u.a.] : Elsevier, 1976, 65(2007), 1/2, Seite 78-95
    In: volume:65
    In: year:2007
    In: number:1/2
    In: pages:78-95
    Description / Table of Contents: The diatom spring bloom and response of the benthic foraminifera was monitored between January and July 2004 in the Kiel Bight, western Baltic Sea. Phytoplankton production, the deposition of organic detritus, and feeding of Elphidium excavatum clavatum and Reophax dentaliniformis were monitored by pigment concentrations and pigment composition in water samples, surface sediments, and foraminiferal protoplasm. The population dynamics of the dominant species, Elphidium e. clavatum, was assessed by using their size distributions. The main spring bloom was triggered by a sudden rise in the three-day average insolation to above 170 W m- 2 d- 1 and took place during late February. Chlorophyll a concentrations in the protoplasm of Elphidium e. clavatum followed those in the surface water. The chlorophyll a / fucoxanthin ratio was the same as in bacillariophycean diatoms suggesting a bloom-feedingʺ behaviour of Elphidium e. clavatum. Alternatively, the pigment composition in Reophax dentaliniformis only occasionally mirrored that of diatoms, indicating prochlorophycean and cyanophycean algae as this species' preferred food source. The size distributions and the abundances of living Elphidium e. clavatum revealed two reproduction events, which were 17 days apart. Both events coincided with an increase in sedimentary chlorophyll a concentrations. The reproduction was preceded by growth and feeding of adult specimens and it was followed by distinct growth phases of young specimens, which lasted a few days only. One reproductive cycle covered the spring bloom and produced many more offspring than the subsequent cycle. The light carbon isotopic signal from diatoms was only transiently recorded in foraminiferal calcite and with a low offset during the spring bloom. The oxygen isotopic composition of foraminiferal calcite mirrors seasonal Delta18 O-seawater-salinity relationships rather than temperature.
    Type of Medium: Online Resource
    Pages: graph. Darst.
    DOI: 10.1016/j.marmicro.2007.06.003
    Language: English
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  • 9
    Article
    Article
    Recent benthic foraminifera in Flensburg Fjord : distribution and response to environmental change (2008)
    Associated volumes
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    In: Polovodova, Irina, 1980 -, Benthic foraminifera & environmental change in the south-western Baltic Sea, 2008, (2008), Seite 21-38
    In: year:2008
    In: pages:21-38
    Type of Medium: Article
    Pages: Ill., Kt.
    Language: English
    Note: Submitted to Journal of micropaleontology
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  • 10
    E-Resource
    E-Resource
    Foraminiferal response to environmental changes in Kiel Fjord, SW Baltic Sea (2008)
    Associated volumes
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    In: eEarth, Katlenburg-Lindau : EGU, 2006, 3(2008), Seite 37-49, 1815-3828
    In: volume:3
    In: year:2008
    In: pages:37-49
    Description / Table of Contents: The living benthic foraminiferal assemblages in Kiel Fjord (SW Baltic Sea) were investigated in the years 2005 and 2006. The faunal studies were accomplished by geochemical analyses of surface sediments. In general, sediment pollution by copper, zinc, tin and lead is assessed as moderate in comparison with levels reported from other areas of the Baltic Sea. However, the inner Kiel Fjord is still exposed to a high load of metals and organic matter due to enhanced accumulation of fine-grained sediments in conjunction with potential pollution sources as shipyards, harbours and intensive traffic. The results of our survey show that the dominant environmental forcing of benthic foraminifera is nutrients availability coupled with human impact. A comparison with faunal data from the 1960s reveals apparent changes in species composition and population densities. The stress-tolerant species Ammonia beccarii invaded Kiel Fjord. Ammotium cassis had disappeared that reflects apparently the changes in salinity over the last 10 years. These changes in foraminiferal community and a significant increase of test abnormalities indicate an intensified environmental stress since the 1960s.
    Type of Medium: Electronic Resource
    Pages: graph. Darst.
    ISSN: 1815-3828
    Language: English
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