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Preliminary PhD workplan Magnus Aune Wiedmann

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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  1. Preliminary PhD workplan Magnus Aune Wiedmann

  2. 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

  3. 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

  4. 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?

  5. 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?

  6. 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

  7. Other possible papers • Barents Sea food web compartmentalization • ?

  8. Deliverables - BarEcoRe • Paper 1: Feeding relationship, ecosystem fluctuations • Paper 2: Vulnerable species list • Paper 3: Functional redundancy/diversity • Paper 4: Resilience, early warning signals

  9. Progression • Literature study • Started on a fish life history table • This spring: much focus on university courses

  10. 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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