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  • Baltic Sea  (2)
  • 14C  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Observations of Ebria tripartita (Schumann) Lemmermann in Baltic sediments (1999)
    Springer
    Journal of paleolimnology 21 (1999), S. 1-8 
    Details
    ISSN: 1573-0417
    Keywords: Ebria triparita ; Baltic Sea ; sediments ; reconstruction ; dissolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Sediment finds of Ebria tripartita (Schumann) Lemmermann in the Baltic Sea are reported and light and electron micrographs of the remains of the taxon are presented. Stratigraphic ebriid analysis performed on two sediment cores (one from the deep Gotland Basin and the other from the shallow Töölö bay, central Helsinki) provided clear indications of frequency changes of E. tripartita. These changes are apparently related to the variations in trophic status and salinity, yet competition and degree of preservation may also have contributed to the distributions. Due to identification problems, the species may actually be more common in the sediment material of the Baltic Sea than has hitherto been recognized. E. tripartita may have a significant potential as an indicator species in paleolimnological research as more information is gathered about its present-day ecological requirements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008019504122
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  • 2
    Electronic Resource
    Electronic Resource
    Shoreline displacement of Lake Ladoga — new data from Kilpolansaari (1996)
    Springer
    Hydrobiologia 322 (1996), S. 205-215 
    Details
    ISSN: 1573-5117
    Keywords: Lake sediments ; diatom flora ; 14C ; Holocene ; River Neva ; Lake Ladoga
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Dating of sediments sampled from small lakes in the Kilpolansaari region, in the NW part of Lake Ladoga, indicate that the River Neva, which is the present outlet of Lake Ladoga, originated at 3,100 radiocarbon years BP This is in agreement with some earlier estimations but no consensus concerning the age of the River Neva has previously been reached. New diatom data provide information concerning salinity and nutrient conditions in northern Lake Ladoga prior to the formation of the River Neva, when the Litorina Sea occupied the Baltic basin and approached the level of the ancient Lake Ladoga. Some slightly brackish water diatom species may indicate occasional saline water incursions into the Ladoga basin but, on the other hand, slightly brackish water species also occur in the present Lake Ladoga.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00031829
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  • 3
    Electronic Resource
    Electronic Resource
    Diatoms in surface sediments of the Gotland Basin in the Baltic Sea (1993)
    Springer
    Hydrobiologia 269-270 (1993), S. 235-242 
    Details
    ISSN: 1573-5117
    Keywords: diatom flora ; ebridians ; marine sediments ; eutrophication ; Baltic Sea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A sediment core, 55 cm long, from station F81 in the Gotland Basin of the Baltic Sea was analysed for diatoms and ebridians. Chrysophyte stomatocysts found in the core were also counted but not identified. The aim was to trace environmental changes, e.g. eutrophication and salinity variations. There is evidence that eutrophication has been increasing in the Baltic Sea in recent decades. Brackish-marine plankton diatoms dominate the entire core and reflect the local planktonic taxa rather well. The dominant taxon is the polyhalobous Actinocyclus octonarius. The main biostratigraphical change within the core analysed takes place at a depth of about 22 cm, where the abundance of diatoms, and especially of Chaetoceros spp., Thalassiosira hyberborea var. pelagica and T. baltica start to increase. This may reflect eutrophication which can be estimated to have started c. 200 years ago.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028022
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