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

Marine Ecology Progress Series

N. Bednar#x161ek¹  M. D. Ohman¹ 

关键词: Pteropoda;    Ocean fronts;    Vertical distribution;    Shell dissolution;   

DOI  :  10.3354/meps11199

学科分类：海洋学与技术

来源: Inter-Research

【 摘 要 】

ABSTRACT: 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 (Ω_arag = 1.0) shoaled from >200 to <75 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 Ω_arag saturation state. Severe shell dissolution (categorized here as Type II and Type III) was low in near-surface waters where Ω_arag > 1.4, while peak dissolution occurred in depths where Ω_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.

【 授权许可】

Unknown