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Measuring the vulnerability of a community to a given pressure:

Spatial workshop outputs: Annual meeting Paris 3-7 Dec 2012. Measuring the vulnerability of a community to a given pressure: Benthos species and bottom trawl in the Barents Sea. Jørgensen, LL, Certain G, Thangstad T, Planque B   . How environmental disturbance affects a community of species.

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Measuring the vulnerability of a community to a given pressure:

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  1. Spatial workshop outputs: Annual meeting Paris 3-7 Dec 2012 Measuring the vulnerability of a community to a given pressure: Benthos species and bottom trawl in the Barents Sea. Jørgensen, LL, Certain G, Thangstad T, Planque B   

  2. How environmental disturbance affects a community of species Divers benthic community delivering ecosystem goods and services Benthic end member community with few number of opportunistic species Mixture where S, A and B increase Bioturbating, filtrating, Habitat structuring Modified after Pearson & Rosenberg 1978 Disturbance

  3. Classical, experimental approach to measure disturbance effect on biodiversity: Directed disturbance (”Pressure a, b or c”) Environmental noise Benthic community Need to identify “fingerprints” from a given pressure

  4. Trawling impact 6 Traits 293 Barents Sea Species A theoretically super-vulnerable species

  5. From an given community sample, we can measure the community vulnerability V = community vulnerability v= species vulnerability P = frequency i=1...S species j=1...L locations

  6. Application to Benthic communities in the Barents Sea (1) Robust communities in trawled area All types of communities in untrawled area Low Vulnerability High

  7. Conclusions • This general method estimate the community vulnerability toward a given pressure (given that species vulnerability to a given pressure can be assessed) Way forward Define manageable units (polygons) based on biota, climate, bottomtop,sed, drivers. Identify LTDS of manageable pressures and natural drivers Use 1 and 2 to follow fixed polygons over time? Look into recovery rates by the use of “protected areas” controlled experiments with vulnerable keyspecies

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