Title: Analyses of the spatial distribution of wood cricket (Nemobius sylvestris) on the Isle of Wight (UK)
1Analyses 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)
2Index
- Introduction
- Objective
- Research Questions
- Study Area
- Method
- Results
- Discussion
3Introduction
- Background
- Woodland conservation
- Restoration and expansion
- Forest Habitat Networks
4Objective
- To determine what factors influence wood cricket
(Nemobius sylvestris) distribution on a
landscape and local scale. -
5Research 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?
6Study Area
7Method
- Summer 2005
- (Mid-July/Mid-September)
- Walk survey
- Woodlands
8Results Distribution
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9Results Woodland Type
- Pearson Chi-Square ?² 1.146, n 215, P 0.564
10Results Woodland Age
- Pearson Chi-Square ?² 4.585, n 144, P 0.032
11Results Woodland Area
- Mann-Whitney test, Z -3.175, n 215, P 0.001
12Results Woodland Shape
- Mann-Whitney test Z -3.254, n 215, P 0.001
13Results N. N. Distance
- Mann-Whitney test Z -6.478, n 215, P 0.000
14Results 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
15Discussion
- Summary
- Type (ns)
- Age (s)
- Area (s)
- Shape (s)
- N. N. Distance (s)
- Logistic regression
16Discussion
- Distance and Area
- Unexplained variation
- Habitat variables
- Conservation effort
- Landscape scale planning
- Target
- Large fragments
- Aggregations
-
17Thank you for your attention