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PhD by: Niels Brouwers (Bournemouth University)

Analyses of the spatial distribution of wood cricket (Nemobius sylvestris) on the Isle of Wight (UK). PhD by: Niels Brouwers (Bournemouth University) Supervised by: Dr. Adrian Newton (Bournemouth University) Dr. Sallie Bailey (Forestry Commission)

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PhD by: Niels Brouwers (Bournemouth University)

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  1. Analyses of the spatial distribution of wood cricket (Nemobius sylvestris) on the Isle of Wight (UK) PhD by: Niels Brouwers (Bournemouth University) Supervised by: Dr. Adrian Newton (Bournemouth University) Dr. Sallie Bailey (Forestry Commission) Dr. Kevin Watts (Forest Research)

  2. Index • Introduction • Objective • Research Questions • Study Area • Method • Results • Discussion

  3. Introduction • Background • Woodland conservation • Restoration and expansion • Forest Habitat Networks

  4. 1 cm Objective • To determine what factors influence wood cricket (Nemobius sylvestris) distribution on a landscape and local scale.

  5. Research Questions: • Where is wood cricket situated on the Isle of Wight? • Is wood cricket presence related to the factors: woodland type, age, area, shape and nearest neighbour distance?

  6. Surface Area: 381 km² Study Area

  7. Method • Summer 2005 (Mid-July/Mid-September) • Walk survey • Woodlands

  8. 46% Results: Distribution 13%

  9. Results: Woodland Type • Pearson Chi-Square: χ² = 1.146, n = 215, P = 0.564

  10. Results: Woodland Age • Pearson Chi-Square: χ² = 4.585, n = 144, P=0.032

  11. vs. Results: Woodland Area • Mann-Whitney test, Z = -3.175, n = 215, P = 0.001

  12. vs. Results: Woodland Shape • Mann-Whitney test: Z = -3.254, n = 215, P = 0.001

  13. Results: N. N. Distance • Mann-Whitney test: Z = -6.478, n = 215, P = 0.000

  14. Results: Logistic Regression Spearman rank correlation: _____________________________________ Area vs. Shape: r = 0.604, P = 0.000 Area vs. Distance: r = 0.139, P = 0.041 Distance vs. Shape: r = 0.098, P = 0.153

  15. Discussion • Summary: • Type (ns) • Age (s) • Area (s) • Shape (s) • N. N. Distance (s) • Logistic regression

  16. better than Discussion • Distance and Area • Unexplained variation • Habitat variables • Conservation effort • Landscape scale planning • Target • Large fragments • Aggregations

  17. Thank you for your attention

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