ALT Exploring population-level feeding as a function of population-specific feeding parameters and size structures. (A) Size structure of Littoraria irrorata from three sites that exhibit different size structure but similar densities. Predicted population-level thermal performance curves (TPCs) for feeding based on the best-fitting Gaussian model (without mass or temperature dependencies but with site-specific estimates of Topt [temperature at which feeding rate is maximal], bmax [an individual’s peak rate of feeding occurring at Topt], c [controls the width of the thermal performance curve], and α [mass-scaling exponent]) for populations from Virginia, South Carolina, and Florida and applied to the size structure of three populations that span a range of size distributions: (B) small, (C) intermediate, and (D) large size structures. Confidence intervals (95%) were bootstrapped using 500 runs and were based on uncertainty in the TPC parameters (not the size structure).

ALT Creating site-specific regressions for Littoraria irrorata. (A) Diagram of Littoraria irrorata depicting shell height (H). Shell height-dry mass regressions for L. irrorata for three study sites: (B) Florida, (C) South Carolina, and (D) Virginia. Dry mass (mg) is measured with the shell removed but operculum intact.