Abstract Molecular studies of sphagnicolous arrhenias in Newfoundland and Labrador (NL) revealed four clades Arrhenia , three obligate (two scaly capped one smooth-capped) facultative (smooth-capped) sphagnophiles. Critical nomenclatural review 16 names used for omphalinoid taxa the past left five suitable to apply this group. One sphagnophilic clade contained type Arr. gerardiana other, Clitoc...

En el Monte Urko hay una sección sin interrupciones sedimentarias que comprende paso Cretácico-Terciario (K/T). El estudio de la nanoflora realizado cuantitativamente sobre un total 500 ejemplares por muestra, escogidos al azar, pone manifiesto asociación típica Zona Mictila murus, con Watznaueria barnesae (Black), Micula decussata Vekshina, Prediscosphaera cretacea (Arkhangelski), Arkhangelski...

Current carbon dioxide emissions are an assumed threat to oceanic calcifying plankton (coccolithophores) not just due to rising sea-surface temperatures, but also because of ocean acidification (OA). This assessment is based on single species culture experiments that are now revealing complex, synergistic, and adaptive responses to such environmental change. Despite this complexity, there is st...

Caribou (Rangifer tarandus) rely on the short Arctic growing season to restore body condition, support demands of lactation, and prepare for long arctic winter, making them susceptible even small changes in forage availability or quality. Body condition summer autumn is linked winter survival rates fecundity cows, critical factors productivity caribou populations. Climate change predictions war...

Marine nitrogen (N2) fixation is important in the global biogeochemical cycling of N, and interlinked carbon (C). Understanding predicting marine N2 requires information on diazotroph species specific rates growth fixation, their biogeography, physiology nutrient limitation diazotrophs nondiazotrophs (for basis competition models). Because many are not easily visualized or quantified yet uncult...

The results of vegetation monitoring from 1999 to 2020 on 12 plots laid out in different types communities Cape Bolvansky Nos the northwest Bolshezemelskaya tundra are presented (Fig. 1). area is located border between southern and typical subzones.
 On five long-term with clay-loam patches bare ground sparse shrubby willowsedge-dwarf shrub-moss were formed. They belong zonal ass. Dryado o...