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Index Foraminifera in Chalk Marl Smaers at the Brodtener Ufer (Coast of the Western Baltic Sea)

  • November 2017
Authors:
Michael Hesemann at Foraminifera.eu Lab
Michael Hesemann
  • Foraminifera.eu Lab
Dieter Ketelsen
Dieter Ketelsen
Dieter Ketelsen
  • This person is not on ResearchGate, or hasn't claimed this research yet.
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Abstract and Figures

Seven index foraminifera from chalk marl smaers of the Brodtener Ufer on the western Baltic coast, appearing for a couple of months are described. They allow to place the smears stratigraphically into the upper Upper Campanian.
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2017 Hesemannn Ketelsen Brodtener Ufer
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Hesemann and Ketelsen Index Foraminife
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All content in this area was uploaded by Michael Hesemann on Feb 03, 2018
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           
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
             
         
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     -     
  
             


-             
      -   
         -  
                



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



         
           
             
    -         



           
          
          


          


            

             -  




-

    
            
  - 




    
         

         

   -    


-
-

      
















-




-


-

        

  

         

     
          
    
          
            
     
-
         
 





  
          
           










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
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
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
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
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
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

             -
 

-


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
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
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


-
-
  --
-
-           
-



--

         -  
--
-

- - -


 - -

-
--
      -
–
-
     -   -     -


-–-

    –   

... For the foraminiferal study, a volume of 10 cm 3 of the first centimetre of surface sediment was immediately fixed using 4% formaldehyde in sea water (neutralized with sodium bicarbonate) and stained with Rose Bengal (2 g/l). Quantification and identification of sorted foraminiferans were done under an Olympus stereo zoom binocular microscope (Martins et al., 2017) and the morphological characteristics described and illustrated by Loeblich and Tappan (1988), Hesemann et al. (2014), Hesemann (2015) and Hesemann and Ketelsen (2017) were followed. A semi-automated digital microphotographic approach was used to measure the biomass of Foraminifera (Thomsen, 1991). ...
Inter fjord variations as a key contributor in the meiobenthic faunal distribution in the Arctic Kongsfjord, Svalbard
Article
  • Aug 2019
The community pattern of meiobenthos in an inner and outer glacial fjord of Kongsfjord was analysed during this study. This study examined the hypothesis that there is a significant difference in the distribution of total meiofauna and the major meiofaunal groups between the inner and outer fjords and it also looked into the effect of environmental variables on their distribution. Meiofaunal abundance and diversity was higher in the inner fjord, indicating that meiofauna can be less sensitive to sediment disturbances caused by glacial activity. Average abundance and biomass of the major meiofaunal groups, namely nematodes (54%) and foraminiferans (37%) were higher in the outer region. 45 species of nematodes representing 20 families were identified during the study, in which Dorylaimopsis sp. (39.55%) and Terschellingia longicaudata (12.53%) had the highest relative abundance. Out of the 56 foraminiferan species belonging to 5 suborders, Nonionellina labradorica (18.30%) and Cassidulina teretis (8.85%) had the highest relative abundance. There are clear and significant changes (ANOSIM) in the assemblage of meiofauna with increasing distance from the glacial front which correlates to environmental variables. Species contributing to differences between inner and outer basins (SIMPER) were also determined. Among nematodes, Chromadorids and Araeolaimids had a tendency to distribute in the inner fjord while Enoplids and Monhysterids were more prevalent in the outer fjord. Sediment organic matter, silt content and pH were the best matching variables (BEST) for the distribution of both nematodes and foraminiferans. The Principal Component Analysis (PCA) revealed that environmental variations have significant patterns in the faunal distribution in Kongsfjord. From this study it can be inferred that the inner fjord has the maximum numerical abundance of meiofauna but the foraminiferans and nematodes were numerically abundant in the outer fjord and there is also significant difference in the distribution of species between the two fjords.
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