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Task 2: Observations of natural spawning substrates

Task 2: Observations of natural spawning substrates. INTERREG IVA Project. Background photo by kind permission of Paul Naylor. Task 2: UK Sites. Selsey. Torbay. Task 2:Stratification of Habitats. E.g. Habitat Maps (Torbay). E.g. Biotope Points (Torbay).

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Task 2: Observations of natural spawning substrates

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  1. Task 2: Observations of natural spawning substrates INTERREG IVA Project Background photo by kind permission of Paul Naylor

  2. Task 2: UK Sites Selsey Torbay

  3. Task 2:Stratification of Habitats

  4. E.g. Habitat Maps (Torbay)

  5. E.g. Biotope Points (Torbay)

  6. Task 2: Site Stratification (Torbay)

  7. Task 2: Site Stratification (Torbay)

  8. Task 2: Site Stratification (Torbay)

  9. Task 2: May & July Site Selection

  10. Task 2: Site Stratification (Selsey)

  11. Task 2: Diving Methodology (UK) • Circular belt transect (4m Radius) • An area of 50m2 surveyed • 4 replicates completed on each dive

  12. Task 2: Diving Methodology (UK) • Line Transects (12.5m in length) • An area of 50m2 surveyed • 4 replicates completed during each dive

  13. Task 2: Results and Analysis * The collection of eggs for Task 4 were recorded and collected from two sites (468 eggs) indicates the large discrepancy that may exist between estimated sampling and actual figures (1577 eggs) –Solutions?

  14. Task 2: Results and Analysis

  15. 2.1 Diving observations- Problems encountered • A lack of habitat maps for both sides of the Channel • A non standardised methodology for conducting surveys on both sides of the Channel • Issues with UK Site 2 (Selsey) seagrass restricted to Chichester Harbour. • Problems with variable estimates of eggs • Problems of variability between surveyors • Problems with data analysis of results

  16. Intertidal Natural Substrate Observations

  17. Artificial Substrate Observations

  18. Artificial substrates

  19. Artificial Substrate Deployment

  20. Monitoring • Deployed on April 20th 2010 • Monitored: • 1st July 2010 by Volunteer divers • 10th August 2010 by HSE divers • Substrates are currently still deployed to allow for all eggs to hatch prior to retrieval

  21. Preliminary Results

  22. Preliminary Results • Multifactor ANOVA shows, the factors of Time (P= 0.001) and Substrate Type (P= 0.000) and the interaction between Time and Substrate Type (P=0.000) were significant for both the number of eggs and clutches laid on each array. • Significantly more eggs were laid April-June than June-August, and in the first time period significantly more eggs were laid on the pot structures than the other substrates. • However, the factor of Site (P=0.922) and its interactions were not significant in the number of eggs and clutches laid.

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