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The biodiversity and abundance of algal species in rock pools

The biodiversity and abundance of algal species in rock pools. Introduction. The rocky shore is an environment subjected to frequent variation and increasing physical stresses as the distance up shore increases.

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The biodiversity and abundance of algal species in rock pools

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  1. The biodiversity and abundance of algal species in rock pools

  2. Introduction The rocky shore is an environment subjected to frequent variation and increasing physical stresses as the distance up shore increases. “The manifestation of tidal movement is zonation of most plants and animals. The limits of these zones are set by the ability of the seaweed/animals to tolerate the particular and specific conditions of that zone. These zones lie parallel to the edge of the water and contain characteristic species.” (Fincham, 1984)

  3. ProjectAims • The project was to investigate: • The abundance and species diversity. • The effects of salinity, temperature and pH on the presence of species. • Adaptations that the algal species display. • Hypothesis: There will be a gradual increase in algal diversity, from the upper shore zone to the lower shore zone. • Null Hypothesis: There will no significant increase in algal diversity

  4. Method The project was undertaken at two sites; Salcombe and Gorah Rocks. The shores were split into three areas; high, middle and low shore and four rock pools were surveyed for increased consistency. Each alga was recorded by percentage cover. Measurements of the salinity, pH and temperature were taken in each rock pool as well as the type of substrate.

  5. The Simpsons Index D = 1 / ∑ p2

  6. The Simpsons Index Examples: 70% = 7/10 7/102 = 0.49 30% = 3/10 3/102 = 0.09 Total value = 0.58 D = 1/0.58 = 1.72 20% = 2/10 2/102 = 0.04 20% = 2/10 2/102 = 0.04 40% = 4/10 4/102 = 0.4 20% = 2/10 2/102 = 0.04 Total value = 0.52 D = 1/0.52 = 1.92

  7. Simpsons Index – Gorah Rocks

  8. Simpsons Index – Salcombe

  9. Gorah Rocks Results

  10. Gorah Rocks Results

  11. Gorah Rocks Results

  12. Salcombe Results

  13. Salcombe Results

  14. Salcombe Results

  15. Anova Test Salcombe Gorah Rocks

  16. Discussion • Gorah- had some dominant species including E.intestinalis on the upper shore, C.officinalis on the middle shore and S.muticum on the lower shore. • Salcombe- had some dominant species including S.muticum on the upper shore, and L.digitata on the lower shore. The middle shore had a high diversity of species, but no dominant species.

  17. Conclusion... • The biodiversity in algae increased from high to low shore rock pools, but this was not seen as significant. • Dominant species were present, reducing the diversity in some rock pools.

  18. Credits This project was undertaken by: Alex Braddock Adam Drew Christopher Dean Rhiannon Mechem Emily Walker Holly Waterman Many thanks for listening!

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