Morphological data of Littorina obtusata populations from reciprocal transplant experiments in the Gulf of Maine conducted 20 years apart

<p>This dataset is part of a broader study conducted in the Gulf of Maine to investigate&nbsp;phenotypic plasticity of prey species in response to predator invasion and warming oceans:</p>

<ol>
<li>Green crab surveys plus historical crab density data (dataset 990378)&nbsp;</li>
<li>Green crab density from field studies at rocky intertidal sites from April 2019 to December 2021&nbsp;(dataset 911365)&nbsp;</li>
<li>Latitudinal (clinal) variation in <em>Littorina obtusata</em> shell thickness and tissue mass (dataset 990839)</li>
<li>Field experiment outplanting&nbsp;<em>Littorina obtusata&nbsp;</em>with predators (green crabs) to examine local and regional geographic variation in inducible defenses&nbsp;conducted from April to August 2021 (dataset&nbsp;911221)</li>
<li>Morphological data from reciprocal transplant experiment in the field <strong>(this dataset<strong>)</strong></strong></li>
</ol>

<p><strong><strong>​</strong></strong>See Related Datasets section below for links and additional details.</p>