I should have also mentioned in my previous post that we now have a publication out on our sandeel-kittiwake work. This showed that sandeels aggregated close to the surface during maximum ebb tidal currents, and this was associated with maximum kittiwake feeding. However this only occurred in limited locations, especially those locations with high sub-surface chlorophyll levels, thus creating localised foraging 'hotspots'.
Embling et al (2012) Investigating fine-scale spatio-temporal predator-prey patterns in dynamic marine ecosystems: a functional data analysis approach. Journal of Applied Ecology
This is a nice follow on from another paper from the same survey also showing the very patchy nature of these foraging hotspots:
Scott et al (2010) Sub-surface hotspots in shallow seas: fine scale limited locations of top predator foraging habitat indicated by tidal mixing and sub-surface chlorophyll. Marine Ecology Progress Series.