The polymetallic nodules lying on the seafloor of Clarion-Clipperton Fracture Zone (CCFZ) represent over 30 billion metric tons manganese. A single mining operation has potential to directly impact approximately 200 km 2 seabed per year. Yet, biodiversity and functioning bentho-demersal ecosystem in CCFZ remain poorly understood. Recent studies indicate a high species diversity food-poor enviro...

Abstract. In low-nutrient low-chlorophyll areas, such as the Mediterranean Sea, atmospheric fluxes represent a considerable external source of nutrients likely supporting primary production, especially during periods stratification. These areas are expected to expand in future due lower nutrient supply from sub-surface waters caused by climate-driven enhanced stratification, further increasing ...

Greater emphasis has been attached to aquatic ecosystems in recent decades, as these are associated with indicators determinant of sustainability indices. The environmental impacts potential risk human health the semi-arid region state Rio Grande do Norte have frequently observed. This study aimed at evaluating cyanobacteria density, and indices that indicate Piancó-Piranhas-Açu Watershed quali...

Abstract. Ice-nucleating particles (INPs) have a large impact on the climate-relevant properties of clouds over oceans. Studies shown that sea spray aerosols (SSAs), produced upon bursting bubbles at ocean surface, can be an important source marine INPs, particularly during periods enhanced biological productivity. Recent mesocosm experiments using natural seawater spiked with nutrients reveale...

We investigated bacterial responses to variations in dissolved organic carbon (DOC) and nutrient availability by a comparative analysis of bacterial metabolism in lakes ranging from oligotrophic to eutrophic. Bacterial growth, respiration, and growth efficiency were quantified in lake water dilution cultures performed in 20 lakes located in eastern Quebec, Canada, which varied with respect to b...

-Pyramid Lake, a salt lake in Nevada, has undergone a 30~ reduction in volume over the past 100 yr due to diversion of river inflow for irrigation of farmland. This has altered the depositional-benthic environment and possibly has changed the overall aquatic environment of Pyramid Lake as indicated by changes in the hydrocarbon and monocarboxylic acid content in a sediment core. In the top 30 c...

Ambient irradiance levels determine the rate of carbon influx into zooxanthellae at any given time, and thereby the energy available for the whole coral symbiotic association. Long-term photoacclimation of zooxanthellae to the time-averaged light regime at which the host coral grows results in optimization of light harvesting and utilization. Under high irradiance light harvesting is reduced, t...

Cyanobacteria thrive in every illuminated aquatic environment known, contributing at least 25% of primary productivity worldwide. Given their importance in carbon and nutrient cycles, cyanobacteria are essential geochemical agents that have shaped the composition of the Earth’s crust, oceans and atmosphere for billions of years. The high diversity of cyanobacteria is reflected in the panoply of...