Divergence and adaptive capacity of marine keystone species

Fietz, K. 2017 [Groningen]: Rijksuniversiteit Groningen. 157 p.

Research output: ScientificDoctoral Thesis

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  • Title and contents

    Final publisher's version, 243 KB, PDF-document

  • Chapter 1

    Final publisher's version, 395 KB, PDF-document

  • Chapter 2

    Final publisher's version, 4 MB, PDF-document

  • Chapter 3

    Final publisher's version, 4 MB, PDF-document

    Embargo ends: 14/07/2018

  • Chapter 4

    Final publisher's version, 9 MB, PDF-document

    Embargo ends: 14/07/2018

  • Chapter 5

    Final publisher's version, 42 KB, PDF-document

  • References

    Final publisher's version, 115 KB, PDF-document

  • Personal Biography

    Final publisher's version, 2 MB, PDF-document

  • Complete thesis

    Final publisher's version, 20 MB, PDF-document

    Embargo ends: 14/07/2018

  • Propositions

    Final publisher's version, 9 KB, PDF-document

  • Katharina Fietz
Anthropogenic actions and environmental alterations today execute pressure on marine organisms. An understanding of population divergence patterns, population sizes, and local adaptive capacities is an important baseline for the design of sustainable management measures. In this thesis, I took a population genetic approach to shed light on the above features of three keystone organisms in the North Atlantic and Baltic Sea ecosystems.

Chapter 1 investigated the processes that drove colonization, extinction, and re-colonization of two grey seal subspecies in the Baltic and North Sea. This work revealed e.g. that historic subspecies divergence between the Baltic and North Sea was likely driven by a combination of environmental and anthropogenic impacts.

Chapter 2 focused on North Atlantic humpback whales and revealed that the Cape Verde breeding population today may be at or below a minimum viable population size. In addition, the amount of long-term average gene flow between Cape Verde and the only other known breeding ground in the West Indies is very limited, indeed of the same level of magnitude as genetic differentiation in humpback whales between ocean basins.

Chapter 3 shed light on the genome-wide population divergence patterns in two sand lance species in the Baltic and North Sea. This study took one step beyond focusing on the genome alone, and additionally drew on information about the associated fish gut and environmental water bacterial communities. It may serve as a benchmark for future work aiming to integrate population genomic with gut microbial data to investigate an organism’s ecological adaptive potential.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Palsboll, Per, Supervisor
  • Gilbert, M.T.P., Supervisor, External person
  • Olsen, M.T., Co-supervisor, External person
  • Limborg, M.T., Co-supervisor, External person
  • Bunce, M., Assessment committee, External person
  • Elsas, van, Jan Dirk, Assessment committee
  • Jarman, S., Assessment committee, External person
  • Lorenzen, E., Assessment committee, External person
  • Wertheim, Bregje, Assessment committee
Award date14-Jul-2017
Place of Publication[Groningen]
StatePublished - 2017

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