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2 results for “Oreohelix”
Geology constrains biomineralization expression and functional trait distribution in the Mountainsnails (Oreohelix)
<p><strong>Aim</strong>: Geographic variation in metabolic resources necessary for functional trait expression can set limits on species distributions. For species that need to produce and maintain biomineralized traits for survival, spatial variation in mineral macronutrients may constrain species' distributions by limiting the expression of biomineralized traits. Here, we examine whether threatened, heavily biomineralized <em>Oreohelix</em> land snails are restricted to CaCO<sub>3</sub> rock regions, if they incorporate greater amounts of CaCO<sub>3</sub> rock carbon in their shell than less biomineralized smooth forms, and if ornamentation increases shell strength.</p> <p><strong>Location</strong>: Western United States</p> <p><strong>Methods</strong>: We used random forest (RF) classification models at multiple spatial resolutions to evaluate the contribution of topographic, vegetation, climate, and geologic variables in predicting the presence of heavily biomineralized shell ornaments. We then measured and compared shell biometric variables, <sup>14</sup>C/<sup>12</sup>C ratios, and peak force for fracture for ornamented and smooth forms from calcareous and non-calcareous substrates.</p> <p><strong>Results</strong>: Distance to CaCO<sub>3</sub> rock was the most important variable in all trait distribution models and was highly associated with local ornamentation classification and forecasted distribution. Pairwise comparisons of <sup>14</sup>C/<sup>12</sup>C ratios in closely occurring ornamented vs. smooth population pairs revealed ornamented forms incorporate greater CaCO<sub>3</sub> rock carbon than smooth forms. Ornamented types measured in this study were generally heavier and required greater peak force for fracture than smooth snails, except when compared to smooth forms sampled from CaCO<sub>3</sub> rock.</p> <p><strong>Main</strong> <strong>conclusions</strong>: Biomineralization expression, species distribution, and trait function appear to be constrained by mineral supply in a highly diverse group of land snails. This trait-environment relationship suggests similar CaCO<sub>3</sub> macronutrient constraints may modulate biomineralization expression and restrict species distribution in other terrestrial molluscs and has a direct impact on the management of <em>Oreohelix</em> species.</p>
Geology constrains biomineralization expression and functional trait distribution in the Mountainsnails (Oreohelix)
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