Report on activities of center associate Ottar Bjornstad

This is the report on my activities at NCEAS during the period December 2, 1997 to April 30, 1998 on the project entitled 'Statistical models for fluctuations in age- and stage-structured populations' funded as a post-doctoral fellowship from the Norwegian National Science Foundation (grant 119117/410). The following papers have been submitted (and if indicated been accepted) during my stay at NCEAS:

1. Bjornstad, O. N., J.-M. Fromentin, N. C. Stenseth and J. Gjos E6ter. Cycles and trends in cod population. Proceedings of the National Academy of Science USA, submitted.

2. Bjornstad, O. N., J.-M. Fromentin, N. C. Stenseth and J. Gjos E6ter. A new test for density-dependent survival: juvenile age-classes of cod. Ecology, submitted.

3. Bjornstad, O. N., N. C. Stenseth and T. Saitoh. Synchrony and scaling in dynamics of voles and mice in northern Japan. Ecology, in press.

4. Bjornstad, O. N., N. C. Stenseth, T. Saitoh and O. C. Lingj E6re. Mapping regional transitions in dynamics of Clethrionomys rufocanus: spectral densities and functional analysis. Researches on Population Ecology, submitted.

5. Kaneko, Y., K. Nakata, T. Saitoh, N. C. Stenseth and O. N. Bjornstad. The biology of the grey-sided vole: a review. Researches on Population Ecology, submitted.

6. Saitoh, T., O. N. Bjornstad and N. C. Stenseth. Density-dependence in voles and mice: a comparative analysis. Ecology, in press.

7. Saitoh, T., N. C. Stenseth and O. N. Bjornstad. The Population Dynamics of the Grey-sided Vole in Hokkaido, Japan. Researches on Population Ecology, submitted.

The following projects have been initiated:

1) Spatial population dynamics: causes and consequences of spatial synchrony in density fluctuations (with Rolf A. Ims at the University of Oslo Norway and Xavier Lambin at the Departement of Zoology, University of Aberdeen, Scotland)

2) Spatial covariance and ecological interaction (with Jordi Bascompte, Bruce Kendall and Tim Keitt, all at NCEAS)

I am currently in the process writing a post-doctoral proposal on Amplification and regulation of recruitment variability in fish populations to be submitted to NCEAS prior to my departure.