English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Among current methods used to esti- mate calcification rates, the alkalinity anomaly tech- nique has been widely used for short-term incu - bations as it is nondestructive and is based on a parameter that is easily and accurately measured. However, total alkalinity is also influenced by other processes such as nutrient consumption and release, and may also require corrections. The calcium anom- aly technique has been little used because calcium is notoriously difficult to measure precisely and several species precipitate calcite with varying contents of magnesium. In this study, calcification rates of ben- thic calcifiers—a crustose coralline alga, a coral, a sea urchin, and a mussel—were estimated with these 2 approaches. Rates derived using the 2 methods were well correlated for all species and did not sig- nificantly differ from each other for corals incubated in the light and dark, and for coralline algae when incubated in the dark. Coralline algae appear to pro- duce magnesian calcite in the light. Sea urchins and mussels released relatively large amounts of am - monia, and a correction of the alkalinity anomaly method was necessary. For urchins, calcification rates based on total alkalinity were higher than rates based on calcium as these organisms incorporate magnesium. For mussels, the corrected alkalinity anomaly technique provided values close to those based on calcium anomaly at low incubation densi- ties, but values were significantly lower at high calci- fication and excretion rates, suggesting that ammo- nium con centrations were underestimated or another process affected total alkalinity. The results demon- strate that the alkalinity and calcium anomaly tech- niques are not robustly applicable to all calcifiers without careful consideration of organism physiology and mineralogy.

Comparison of the alkalinity and calcium anomaly techniques to estimate rates of net calcification