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

We assessed picoand nanoplankton grazing rates as well as dissolved free amino acid (DFAA) uptake rates by the symbiotic coral Stylophora pistillata exposed to thermal and photo stress with concomitant bleaching. The aim was to determine whether these types of food sources could maintain the daily energetic requirements of this coral species. Moreover, the total organic carbon (TOC) flux was measured to quantify bulk C loss or gain. Under control conditions (27°C and 200 μmol photons m−2 s−1), autotrophic C acquisition covered more than 90% of the respiratory needs of non-bleached corals. Another 10.6% of the respiratory needs were covered by picoand nanoplankton grazing. Net TOC flux rates were negative, indicating substantial TOC uptake by the corals. After the stress (31°C and 300 μmol photons m−2 s−1), the contribution of autotrophic C to the respiratory demand decreased to 64% in bleached corals. Picoand nano plankton grazing covered only 2 and 7% of the respiratory needs during and after the stress, respectively. These findings demonstrate a substantial stress-induced impact on autoand heterotrophic capacities for energy acquisition in this species. Although no significant change occurred in the DFAA uptake rates, a significant change in the TOC flux direction was observed, which resulted in TOC net release. Consequently, autotrophy and heterotrophy were less efficient in sustaining the respiratory needs of bleaching and bleached S. pistillata, suggesting that this coral species, and possibly other related species, can be severely endangered by reoccurring and widespread bleaching events.

Experimental assessment of organic carbon fluxes in the scleractinian coral Stylophora pistillata during a thermal and photo stress event