School of Conservation Sciences Analyses of the spatial distribution of wood cricket (Nemobius sylvestris) on the Isle of Wight (UK) PhD by: Niels Brouwers.

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Presentation transcript:

School of Conservation Sciences 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)

School of Conservation Sciences Index Introduction Objective Research Questions Study Area Method Results Discussion

School of Conservation Sciences Introduction Background –Woodland conservation –Restoration and expansion –Forest Habitat Networks

School of Conservation Sciences Objective To determine what factors influence wood cricket (Nemobius sylvestris) distribution on a landscape and local scale. 1 cm

School of Conservation Sciences 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?

School of Conservation Sciences Study Area Surface Area: 381 km²

School of Conservation Sciences Method Summer 2005 (Mid-July/Mid-September) Walk survey Woodlands

School of Conservation Sciences 13% 46% Results: Distribution

School of Conservation Sciences Results: Woodland Type Pearson Chi-Square: χ² = 1.146, n = 215, P = 0.564

School of Conservation Sciences Results: Woodland Age Pearson Chi-Square: χ² = 4.585, n = 144, P = 0.032

School of Conservation Sciences Results: Woodland Area Mann-Whitney test, Z = , n = 215, P = vs.

School of Conservation Sciences Results: Woodland Shape Mann-Whitney test: Z = , n = 215, P = vs.

School of Conservation Sciences Results: N. N. Distance Mann-Whitney test: Z = , n = 215, P = 0.000

School of Conservation Sciences Results: Logistic Regression VariablesWalddfSignificance (P)R² adjusted Area n.s Shape Distance Logistic regression models Distance + Area Distance + Shape Distance + Area + Shape Spearman rank correlation: _____________________________________ Area vs. Shape: r = 0.604, P = Area vs. Distance: r = 0.139, P = Distance vs. Shape:r = 0.098, P = 0.153

School of Conservation Sciences Discussion Summary: –Type (ns) –Age (s) –Area (s) –Shape (s) –N. N. Distance (s) –Logistic regression

School of Conservation Sciences Discussion Distance and Area –Unexplained variation –Habitat variables Conservation effort –Landscape scale planning –Target Large fragments Aggregations better than

School of Conservation Sciences Thank you for your attention