Ecological plasticity is a well-known phenomenon in the animal kingdom, whereby different populations of a species, living in ecologically distinct habitats, exist in different forms but are not genetically distinct. Ecotypes often differ in essential life history characteristics like growth rate or age at sexual maturity, which creates body size or shape differences (Pfenning et al. 2010). Studies have shown that having alternate ecotypes can be critical to the evolutionary survival of a species, especially in unstable environments (Keeley et al. 2007; Smith and Skúlason 1996)