Herdís G. R. Steinsdóttir

Abstract Coral reefs are dynamic ecological hotspots, yet their influence on surrounding microbial plankton remains poorly studied. High-frequency diel sampling of Red Sea reef waters during mesotrophic winter and oligotrophic summer conditions revealed distinct prokaryotic and microeukaryotic communities compared to nonreef waters, along with previously undescribed diel cycles.

Abstract We investigated methane oxidation in the oxygen minimum zone (OMZ) of the eastern tropical North Pacific (ETNP) off central Mexico. Methane concentrations in the anoxic core of the OMZ reached ~ 20 nmol L−1 at off shelf sites and 34 nmol L−1 at a shelf site. Rates of methane oxidation were determined in ship‐board incubations with 3H‐labeled methane at O2 concentrations 0–75 nmol L−1.