Analyses of the spatial distribution of wood cricket (Nemobius sylvestris) on the Isle of Wight (UK) - PowerPoint PPT Presentation

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Analyses of the spatial distribution of wood cricket (Nemobius sylvestris) on the Isle of Wight (UK)

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Analyses of the spatial distribution of wood cricket (Nemobius sylvestris) on the Isle of Wight (UK) PhD by: Niels Brouwers (Bournemouth University) – PowerPoint PPT presentation

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Title: Analyses of the spatial distribution of wood cricket (Nemobius sylvestris) on the Isle of Wight (UK)


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

8
Results Distribution
13
9
Results Woodland Type
  • Pearson Chi-Square ?² 1.146, n 215, P 0.564

10
Results Woodland Age
  • Pearson Chi-Square ?² 4.585, n 144, P 0.032

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

12
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
Variables Wald df Significance (P) R² adjusted R² adjusted
Area 3.158 1 0.076 n.s. 0.037 0.037
Shape 10.003 1 0.002 0.072 0.072
Distance 18.100 1 0.000 0.291
Logistic regression models          
Distance Area 16.086 1 0.000 0.380 0.380
Distance Shape 11.181 1 0.001 0.367 0.367
Distance Area Shape 4.305 2 0.038 0.404 0.404
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
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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