Present address: Monterey Bay Aquarium Research Institute (MBARI), 7700 Sandholdt Road, Moss Landing, CA 95039, USA.
The island rule and the evolution of body size in the deep sea
Article first published online: 29 JUN 2006
Journal of Biogeography
Volume 33, Issue 9, pages 1578–1584, September 2006
How to Cite
McClain, C. R., Boyer, A. G. and Rosenberg, G. (2006), The island rule and the evolution of body size in the deep sea. Journal of Biogeography, 33: 1578–1584. doi: 10.1111/j.1365-2699.2006.01545.x
- Issue published online: 29 JUN 2006
- Article first published online: 29 JUN 2006
- food availability;
- resource limitation;
- size constraints
Aim Our goal is to test the generality of the island rule – a graded trend from gigantism in small-bodied species to dwarfism in large-bodied species – in the deep sea, a non-insular but potentially analogous system.
Location Shallow-water and deep-sea benthic habitats in the western Atlantic Ocean from the North to South Poles.
Methods We conducted regression analyses of body size of deep-sea gastropods species relative to their shallow-water congeners using measurements from the Malacolog ver. 3.3.3 database.
Results Our results indicate that, consistent with the island rule, gastropod genera with small-bodied, shallow-water species have significantly larger deep-sea representatives, while the opposite is true for genera that are large-bodied in shallow water. Bathymetric body size clines within the deep sea are also consistent with predictions based on the island rule.
Main conclusions Like islands, the deep sea is characterized by low absolute food availability, leading us to hypothesize that the island rule is a result of selection on body size in a resource-constrained environment. The body size of deep-sea species tends to converge on an optimal size for their particular ecological strategy and habitat.