Tree of the sea: The use of the internal growth lines in the shell of Arctica islandica (Bivalvia, Mollusca) for the retrospective assessment of marine environmental change

Witbaard, R., 1997, s.n.. 149 p.

Research output: ThesisThesis fully internal (DIV)Academic

Copy link to clipboard


  • titlecon.pdf

    Final publisher's version, 23 KB, PDF document

  • c1.pdf

    Final publisher's version, 373 KB, PDF document

  • c2.pdf

    Final publisher's version, 198 KB, PDF document

  • c3.pdf

    Final publisher's version, 273 KB, PDF document

  • c4.pdf

    Final publisher's version, 130 KB, PDF document

  • c5.pdf

    Final publisher's version, 131 KB, PDF document

  • c6.pdf

    Final publisher's version, 359 KB, PDF document

  • c7.pdf

    Final publisher's version, 192 KB, PDF document

  • c8.pdf

    Final publisher's version, 68 KB, PDF document

  • referenc.pdf

    Final publisher's version, 69 KB, PDF document

  • thesis.pdf

    Final publisher's version, 1 MB, PDF document

  • Rob Witbaard
Within the North Sea the southernmost distribution limit of Arctica follows the 30 m depth contour. This border is most likely set by the maximum bottom water temperature of 16 graden. Densities of 16 individuals/m2 were found in the northern North Sea. In the south-eastern North Sea the maximum density of 0.1 ind./m2 is low, especially compared to those around Iceland or the western Atlantic. In the south-eastern North Sea the densities decreased between the 1970s and the early 1990s. Both the percentage of sampling stations and the corresponding densities decreased. The mortality rate in the south-eastern North Sea is twice as high as that in the northern North Sea. ... Zie: Summary
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Wilde, P, Supervisor
Award date30-May-1997
Publication statusPublished - 1997


  • Proefschriften (vorm), Ecologische aspecten, Groei, Bivalvia, 42.73

Download statistics

No data available

ID: 1451844