Pteropod assemblages in the oceanic waters of the southern Gulf of Mexico (June 2015)

Deep Sea Research Part I Oceanographic Research Papers, Год журнала: 2024, Номер unknown, С. 104431 - 104431

Опубликована: Дек. 1, 2024

Язык: Английский

Assessing annual variability in the shell thickness of the pteropod <i>Heliconoides inflatus</i> in the Cariaco Basin using micro-CT scanning

Опубликована: Окт. 10, 2019

Abstract. Pteropods have been nicknamed the canary in coal mine for ocean acidification because they are predicted to be among first organisms affected by future changes chemistry. This is due their fragile, aragonitic shells and high abundances polar sub-polar regions where impacts of will manifest first. For pteropods used most effectively as indicators acidification, natural variability modern needs quantified understood. Here, we measured shell condition (i.e., degree which a has dissolved) characteristics, including size, number whorls, thickness, volume amount material) nearly fifty specimens pteropod species Heliconoides inflatus from sediment trap Cariaco Basin, Venezuela sampled over an 11-month period. The water Basin supersaturated with respect aragonite year-round, hydrographic chemical properties vary seasonally movement Inter Tropical Convergence Zone (ITCZ). Shell was assessed using two methods: Limacina Dissolution Index (LDX) opacity method. method captured only early stages dissolution, whereas LDX recorded dissolution much larger range. did not deteriorate length time trap. Instead, altered occurred samples collected September October when temperatures were warmest, organic matter degradation column likely greatest. Shells H. varied thickness throughout year. whorls correlate diameter, suggesting that growth plastic. formed 40 % thicker 20 diameter nutrient concentrations during times upwelling, compared oligotrophic rainy season. study produces baseline dataset characteristics establishes methodology generating similar records populations globally.

Язык: Английский

Sea butterflies in a pickle: Reliable biomarkers and seasonal sensitivity of pteropods to ocean acidification in the Gulf of Maine

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2023, Номер unknown

Опубликована: Авг. 2, 2023

Abstract The passive dissolution of anthropogenically produced CO 2 into the ocean system is reducing pH and changing a suite chemical equilibria, with negative consequences for some marine organisms, in particular those that bear calcium carbonate shells. Although our monitoring these changes has improved, we have not developed effective tools to translate observations, which are typically saturation state, ecologically relevant predictions biological risks. One potential solution develop bioindicators: variables clear relationship environmental risk factors can be used assessment management. Thecosomatous pteropods, group pelagic shelled gastropods, whose responses been suggested as bioindicators OA owing their sensitivity acidification both laboratory natural environment. Using five exposure experiments, occurring across 4 seasons running up 15 days, describe consistent between shell transparency, duration exposure, well identify genes could monitoring. We clarify variations thecosome due seasonality, resolving prior uncertainties demonstrating range phenotypic plasticity. These biomarkers stress implemented ecosystem models programs regions where pteropods found, while approach will serve an example other on how bridge gap point-based biologically assessments health. Summary Statement Despite seasonal variability, exposed over multiple reveal patterns gene expression condition stress.

Язык: Английский