Task 2: In situ observation of natural substratum where spawning females attach their eggs

1. 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) 2nd Meeting of the CRESH project Plymouth, October 28-30 2009

2. 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) 2nd Meeting of the CRESH project Plymouth, October 28-30 2009

3. Eggs Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations Summary of field work: + Differences between pilot sites (even without quantitative assessment) 2nd Meeting of the CRESH project Plymouth, October 28-30 2009

4. 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 2nd Meeting of the CRESH project Plymouth, October 28-30 2009

5. 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 2nd Meeting of the CRESH project Plymouth, October 28-30 2009

6. 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) 2nd Meeting of the CRESH project Plymouth, October 28-30 2009

7. 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? 2nd Meeting of the CRESH project Plymouth, October 28-30 2009

8. 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? 2nd Meeting of the CRESH project Plymouth, October 28-30 2009

9. Task 2: In situ observation of natural substratum where spawning females attach their eggs University of Caen 2009 observations Thank you 2nd Meeting of the CRESH project Plymouth, October 28-30 2009