Changes in pteropod distributions and shell dissolution across a frontal system in the California Current System

We tested the sensitivity of the vertical distributions and shell dissolution patterns of thecosome pteropods to spatial gradients associated with an eddy-associated front in the southern California Current System. The aragonite saturation horizon ($Ømega$arag = 1.0) shoaled from \textgreater200 to \textless75 m depth across the front. The vertical distribution of thecosome pteropods tracked these changes, with all 5 species showing reduced occurrence at depths below 100 m where waters were less saturated with respect to aragonite. Shell dissolution patterns of the numerically dominant thecosome Limacina helicina corresponded to the cross-frontal changes in $Ømega$arag saturation state. Severe shell dissolution (categorized here as Type II and Type III) was low in near-surface waters where $Ømega$arag \textgreater 1.4, while peak dissolution occurred in depths where $Ømega$arag = 1.0 to 1.4. Vertical habitat compression and increased shell dissolution may be expected to accompany future shoaling of waters that are undersaturated with respect to aragonite.

Data and Resources

This dataset has no data

Additional Info

Creator
  • Bednaršek N
  • Ohman M D
Identifier
Source