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MUMM Bivalves adaptation in the BCS: a trait-based approach E. Martini, X. Desmit, G. Lacroix, F. Kerckhof, S. Degraer Liége Colloquium May 15, 2013.

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Presentation on theme: "MUMM Bivalves adaptation in the BCS: a trait-based approach E. Martini, X. Desmit, G. Lacroix, F. Kerckhof, S. Degraer Liége Colloquium May 15, 2013."— Presentation transcript:

1 MUMM Bivalves adaptation in the BCS: a trait-based approach E. Martini, X. Desmit, G. Lacroix, F. Kerckhof, S. Degraer Liége Colloquium May 15, 2013

2 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Introduction Species distribution + Environmental factors distribution Correlation No mechanistic link Macoma balthicaAbra alba Degraer et al. 2008 Hypothesis: bivalves growth and survival depends on TSM

3 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM The bigger the organs the better their function TSM Food for bivalves: algae + detritus Gradient in the BCS Palps Compton et al. 2007 © Barbara Harmon

4 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Hypothesis and conceptual model Hypothesis: bivalve communities in the BCS are structured by food availability and quality, and the traits determining the fittest species are gills and palps masses.

5 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Bivalves model equations

6 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Measuring traits - Methods Campaign on board Belgica In the lab Burned in the muffle furnace at 500° C for 4 hours Weighted to the 0.1 mg dissection of gills and palps within the 24 h 8 m beam trawl on several transects

7 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Measurements results Remote sensing TSM (g m -3 )

8 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Measurements results Compton et al. 2007

9 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Palp: 4.3 mg Gill/palp : 2.9 Measurements results 2 1 Palp: 5.9 mg Gill/palp : 2.4 Remote sensing TSM (g m -3 )

10 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Preliminary model results

11 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Preliminary model results

12 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Data show that in the BCS gills and palps masses respond to TSM and food concentration in line with our hypothesis Size of the feeding apparatus (gills+palps) seems to play a role (feeding time) Lack of parameters for model rates Physiological plasticity to adapt to different conditions can widen the range of values for the traits. Final thoughts For the future Refine model parameters, also through experiments that measure the rates Extend the measurements to more conditions and species To summarize: Improve the model

13 Liège Colloquium 2013May 15, 2013http://www.mumm.ac.be Management Unit of the North Sea Mathematical Models MUMM | BMM | UGMM Acknowledgments TRIPS. Assessing macrobenthos adaptation with a trait-based model in the Southern bight of the North Sea Thank you for your attention!

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