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CRESH project 2 nd Meeting of the CRESH project Plymouth, October 28-30 2009 Task 2: In situ observation of natural substratum where spawning females attach.

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Presentation on theme: "CRESH project 2 nd Meeting of the CRESH project Plymouth, October 28-30 2009 Task 2: In situ observation of natural substratum where spawning females attach."— Presentation transcript:

1 CRESH project 2 nd Meeting of the CRESH project Plymouth, October Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations 2 complementary techniques : – walking observations – diving observations (at LWST) (sub-tidal)

2 CRESH project 2 nd Meeting of the CRESH project Plymouth, October Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations 2 pilot study sites : - West-Cotentin (Agon-Coutainville) (Marine Dehail) - Bay of Seine (Langrune-sur-mer) (Stéphanie Linsale)

3 CRESH project 2 nd Meeting of the CRESH project Plymouth, October Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations Summary of field work: Eggs + Differences between pilot sites (even without quantitative assessment)

4 CRESH project 2 nd Meeting of the CRESH project Plymouth, October Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations Summary of field work: + Additional observations in July (eggs for task 4) (Do not change the general picture) + In the West Cotentin inter-annual differences (between 2008 and 2009) This requires some estimation of the density of egg masses

5 CRESH project 2 nd Meeting of the CRESH project Plymouth, October Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations Summary of field work: Types of substratum where eggs are attached (West Cotentin) In the intertidal area : lower diversity than in 2008 In the subtidal area: observations extended to a wider range of types

6 CRESH project 2 nd Meeting of the CRESH project Plymouth, October Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations Summary of field work: + additional data collected : bathymetry temperature (better time series available in the West-Cotentin) + outputs and display of bottom types ( examples of maps prepared with ArcGIS)

7 CRESH project 2 nd Meeting of the CRESH project Plymouth, October Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations + outputs and display of bottom types ( examples of maps prepared with ArcGIS) can we use GIS to compute sampled distances?

8 CRESH project 2 nd Meeting of the CRESH project Plymouth, October Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations + outputs and display of bottom types ( examples of maps prepared with ArcGIS) can we use GIS to compute sampled distances?

9 CRESH project 2 nd Meeting of the CRESH project Plymouth, October Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations Thank you


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