Preliminary PhD workplan
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Preliminary PhD workplan Magnus Aune Wiedmann. Myself. Magnus Aune Wiedmann 27 years old, married to Ingrid, no children Master in Marine Ecology, University of Tromsø, spring 2010. Supervisors: Ole Petter Pedersen & Kurt Tande Worked as research assistant at UiT autumn 2010

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Preliminary PhD workplan Magnus Aune Wiedmann

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Preliminary phd workplan magnus aune wiedmann

Preliminary PhD workplan

Magnus Aune Wiedmann


Myself

Myself

  • Magnus Aune Wiedmann

  • 27 years old, married to Ingrid, no children

  • Master in Marine Ecology, University of Tromsø, spring 2010. Supervisors: Ole Petter Pedersen & Kurt Tande

  • Worked as research assistant at UiT autumn 2010

  • Spare time interests: diving and ocean sailing


Status paper 1

Status Paper 1

  • Title: Capelin larvae in the Barents Sea: multiple enemies or mainly threatened by herring?

  • Focus: Spatio-temporally modelled survival of capelin larvae preyed upon by young herring.

  • Conclusion: - Herring is important, but

    - Capelin larvae are also threatened by numerous other factors.

  • Status: Submitted to the Canadian Journal of Fisheries and Aquatic Sciences

  • Relates to BarEcoRe: - Feeding relationship

    - Ecosystem fluctuations


Paper 2

Paper 2

  • Title: Vulnerable species in the Barents Sea

  • Background: - Increased temperatures  decreased organism size (Daufresne et al. 2009)

    - fisheries modifies age compositions and increase fish abundance variability (Hsieh et al. 2006)

  • Approach: - Study fish length distributions through time.

    - Study the number of species vs. the number of individuals at specific areas through time.

  • Goal: - Any changes in length structure?

    - Establish a ”vulnerable species list”

    - Are we ”fishing down the foodweb” in the Barents Sea?

  • Submission: Autumn 2011?


Paper 3

Paper 3

  • Title: Functional redundancy in the Barents Sea fish community

  • Background: Species interacting with many other species might be destabilizing for the ecosystem network (Wilmers 2007), and can be unrobust (Wilmers et al. 2002).

  • Approach:- Study the degree of ecological /trophic overlap. - Will use cluster and multivariate analyses. - Based on information that soon will be available from a fish life trait matrix.

  • Aim: - Identify the food web structure of the Barents Sea by means of ecological overlap between species.

    - This will be connected to their redundancy.

  • Submission: Late spring 2012?


Paper 4

Paper 4

  • Title: BS fish communities: resilience and early warning signals

  • Approach: - Identify possibly reduced BS ecosystem resilience - Identify possibly approaching critical transitions (Scheffer et al. 2009).

    - Study early warning signals by means of potential changes in fish abundance variance and autocorrelation

  • Aim: - Assess how the results from the latter two papers (Paper 2+3) in combination can explain changes in fish abundance.

    - Estimate engineering resilience

  • Submission: Spring 2013


Other possible papers

Other possible papers

  • Barents Sea food web compartmentalization

  • ?


Deliverables barecore

Deliverables - BarEcoRe

  • Paper 1: Feeding relationship, ecosystem fluctuations

  • Paper 2: Vulnerable species list

  • Paper 3: Functional redundancy/diversity

  • Paper 4: Resilience, early warning signals


Progression

Progression

  • Literature study

  • Started on a fish life history table

  • This spring: much focus on university courses


References

References

Daufresne, M., Lengfellner, K. and Sommer, U. 2009. Global warming benefits the small in aquatic ecosystems. Proc. Nat. Ac. Sci. 106: 12788-12793.

Hsieh, C., Reiss, C.S., Hunter, J.R., Beddington, J.R., May, R.M. and Sugihara, G. 2006. Fishing elevates variability in the abundance of exploited species. Nature 443: 859-862.

Levin, S.A. and Lubchenco, J. 2008. Resilience, robustness and marine ecosystem-based management. Bioscience 58: 27-32.

Scheffer, M. et al. 2009. Early-warning signals for critical transitions. Nature 461: 53-59.

Wilmers, C.C. 2007. Understanding ecosystem robustness. TREE 22: 504-506.

Wilmers, C.C., Sinha, S. and Brede, M. 2002. Examining the effects of species richness on community stability: an assembly model approach. OIKOS 99: 363-367.


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