Water temperature and season length interact to explain a rare non‐linear ecogeographic cline in body size

S. Barry,Matthew D. Smith,Berlynna Heres,Travis M. Thomas,Brittany J. Hall‐Scharf,H. J. Brockmann

Published 2023 in Journal of Biogeography

ABSTRACT

Adult body size often exhibits patterns across large‐scale environmental gradients, creating ecogeographic clines. However, the form of body size clines varies across taxonomic groups, with linear and non‐linear patterns in body size observed in nature. Non‐linear body size clines have received less study, and questions remain about how environmental gradients interact to produce non‐linear clines. We examined the body size of the American horseshoe crab (Limulus polyphemus), a widely distributed marine arthropod, and evaluated the hypothesis that temperature and active season length can interact multiplicatively to result in a dome‐shaped distribution.

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