Long-term high-density occupation of a site by Octopus tetricus and possible site modification due to foraging behavior: Marine and Freshwater Behaviour and Physiology: Vol 45, No 4

We report observations of wild octopuses (Octopus tetricus) living in close proximity at a site centered on a single den that has been occupied since at least November 2009. Numbers observed on survey dives range from 2 to 11 (average of 5.48). We hypothesize that long-term occupation of the site has led to its physical modification through the accumulation of shells brought in during foraging, and that this "ecosystem engineering" has in turn resulted in higher densities being viable at the site.

Keywords:

octopus cephalopod Octopus tetricus population structure ecosystem engineering reproductive behavior

Acknowledgments

Eliza Jewett-Hall assisted with Figure 1B. Gavin Swan filmed additional Video Record 1. Peter Adams and Gavin Swan assisted with diving. We are grateful to Roger Hanlon, Christine Huffard, Stefan Linquist, Jennifer Mather, Jane Sheldon, and three anonymous referees for helpful comments on drafts.