Lake Bonney is one of several permanently ice-covered lakes in the McMurdo Dry Valleys, Antarctica, which maintain the only year-round biological activity on the Antarctic continent. Vertically stratified populations of autotrophic microorganisms occupying the water columns are adapted to numerous extreme conditions, including very low light, hypersalinity, ultra-oligotrophy and low temperature...

Nutrient availability and ratios can play an important role in shaping microbial communities of freshwater ecosystems. The Cuatro Ciénegas Basin (CCB) in Mexico is a desert oasis where, perhaps paradoxically, high microbial diversity coincides with extreme oligotrophy. To better understand the effects of nutrients on microbial communities in CCB, a mesocosm experiment was implemented in a stoic...

The oligotrophy of the southern Adriatic Sea is characterized by seasonal stratification which enables nutrient supply to euphotic layer. A set interdisciplinary methods was used elucidate diversity and co-dependency bacterio- phytoplankton water column during period July 2021. total 95 taxa were determined microscopy: 58 diatoms, 27 dinoflagellates, 6 coccolithophores, 4 other autotrophs, incl...

The Mediterranean Sea is particularly sensitive to climate oscillations and represents a key location study past climatic oceanographic changes. One valuable source of paleoceanographic information through molecular biomarkers in deep sea sediments. This approach has been applied number studies this basin, but only covering the most recent glacial/interglacial cycles. Here we present, for first...

The Ria Formosa, Southern Portugal (Algarve) is a mesotidal lagoon with restricted exchange Atlantic Ocean. Due to arid Mediterranean climate and absence of large freshwater inputs, the remains hypersaline relative adjacent ocean (≥37 psu). Generally, fecal coliforms land-derived bacteria do not survive long in seawater due UV, osmotic shock, oligotrophy competition marine bacteria. However, su...

Wildfire and burn severity influence soil microbial communities during post-fire recovery. If differences in affect carbon (C) pool dynamics, altered could the transition of forests from C sources to sinks ecosystem For example, fire may change abundance copiotrophic oligotrophic bacteria, influencing kinetic rates pools due C-acquisition strategies nutrient requirements. We assessed bacterial ...

aim. To monitor changes in the microbial component of gray forest soil under influence traditional and modern types fertilizers used agriculture. Methods. Microbiological, laboratory-analytical, statistical. Results. It has been established that use organo-mineral fertilization system allows to intensify development organic matter by 56.3%, mineralization nitrogen compounds 14.7%, increases oli...

Using light (LM, including plastid characterization on fresh material) and scanning electron microscopy (SEM), as well a thorough morphological, physical, chemical, biological of the habitats, present study aims at describing three species new to science. They belong genera Eunotia Ehrenb., Planothidium Round L. Bukht., Delicatophycus M.J. Wynne, were found in two contrasting spring types north...

Because the nature of the main resource that limits bacterioplankton (e.g. organic carbon [C] or phosphorus [P]) has biogeochemical implications concerning organic C accumulation in freshwater ecosystems, empirical knowledge is needed concerning how bacteria respond to these two resources, available alone or together. We performed field experiments of resource manipulation (2×2 factorial design...