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Thresholds In Songbirds In Relation To Early Seral Forest At Stand And Landscape Scales
- 1. Matt Betts, Tana Ellis Forest Ecosystems and Society, OSU Collaborators: Joan Hagar, Brenda McComb, Kevin McGarigal, Jim Rivers Thresholds in songbirds in relation to early seral forest at stand and landscape scales
- 3. Area decrease = ~40% Mean patch size decrease = ~35% Kennedy and Spies 2005 Biol. Cons. (1939)
- 8. Orange-crowned warbler Rufous hummingbird
- 11. ~
- 13. Habitat variable ‘x’(Stand or landscape scale) Betts and Villard 2009 – Cons. Targets. Betts et al. 2007 – Cons. Biol. Population size/ occurrence/ density
- 16. 4375 sample points 127,164 bird detections 110 species
- 17. Gradient Nearest Neighbor (GNN) method for predictive vegetation mapping Regional forest survey + Remote sensing data + Imputation = spatial data
- 18. Coastal Oregon Oregon Attribute table (joined to ArcGIS grid) Each pixel, or ArcGIS grid cell
- 21. 2 km 0.5 km
- 22. p = exp (β0 + β1 x + β2( x – ψ)+) / 1 + exp (β0 + β1 x + β2( x – ψ)+) Segmented logistic regression: Muggeo (2003) Statistics in Medicine Threshold Detection
- 26. GNN Species distribution performance: Mean AUC = 0.83 ± 0.002 s.e. Best spatial scale = 2000 m
- 28. Betts et al. Ecol. Apps. In Press
- 31. Tana Ellis and Matt Betts Oregon State University Forest Ecosystems & Society
- 39. Full model R 2 = 0.45 Foliage gleaners= 12.8% (SE=3.5) Model Wi AIC Δ AIC THRESHOLD SE Segmented 0.98 2.19 0.00 6.456 1.709 Linear 0.02 10.18 8.00 - - Hardwood threshold at 6.7 % (SE=1.6)
- 40. Adult orange-crowned warbler HY (juvenile) orange-crowned warbler
- 41. β SE t P (Intercept) -2.09 0.06 -35.44 0.000 Log(Hardwood) 0.08 0.03 2.84 0.009 β SE t P (Intercept) -2.017 0.077 -26.143 0.000 logHWD 0.058 0.037 1.586 0.125 AGE-HY -0.139 0.097 -1.429 0.165 logHWD:AGEHY 0.043 0.046 0.926 0.363
- 42. Migrant Bird Demography Nest success Juvenile survival Migratory survival Adult survival Overwinter survival Faaborg et al 2010 Ecol. Monogr.
- 47. SWTH nest
- 49. SWTH nest
- 50. Fledgling SWTH with transmitter
- 52. What happened to fledgling #150.781?
- 56. THANKS!
Editor's Notes
- Early seral (Whimbery et al.) included high AND moderate severity disturbance
- Previous proposal tests effects of intensive forest management at stand level. However, it is well known that many species respond to forest structure at larger (landscape) scales. Scales larger than the home range.
- Hardwood. 60% prediction success at pixel scale. 96% within one class.
- Used an exploratory approach where we looked
- Previous proposal tests effects of intensive forest management at stand level. However, it is well known that many species respond to forest structure at larger (landscape) scales. Scales larger than the home range.