If you go down to the woods today:
spatially explicit models of black bears in Alaska

David L Miller (CREEM)

CREEM Seminar, 18 December 2013

Susitna-Watana dam

Problems

Survey area

Aerial line transects

1238 transects

Survey protocol

Spatial modelling using DSM

Spatial modelling using DSM

Spatial modelling using DSM

Spatial modelling using DSM

Distance sampling

Detection function

Black bears

Detection function

Search distance: distance from line to the furthest location.

Pilot search type: 2 groups, with one group searching further out.

Spatial modelling

\[ \mathbb{E}(\hat{N}_j) = A_j \exp \left( \sum_k f_k(\zeta_{jk}) \right) \]

where \(f_k\) are smooths of covariates \(\zeta_k\), segment area \(A_j\)

and

\[ \hat{N}_j = \sum_{i \in \text{ transect } j}\frac{s_i}{p_i} \]

Other modelling details

Randomised quantile residuals

gam.check

rqgam.check

Selecting smooth terms

Final model

Abundance estimate for GMU13E

Abundance map

CV map

Conclusion

Future work

References

Talk available at http://dill.github.com/talks/akbears/talk.html

Thanks