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The island rule and the evolution of body size in the deep sea

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Abstract 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.
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Keywords: Bathymetric; Malacolog; depth; dwarfism; food availability; gastropods; gigantism; macroecology; miniaturization; resource limitation; size constraints

Document Type: Research Article

Affiliations: 1: Department of Biology, University of New Mexico, Albuquerque, NM 87131 2: Department of Malacology, Academy of Natural Sciences, Philadelphia, PA 19103, USA

Publication date: 01 September 2006

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