Zooplankton has a non-random distribution in the pelagic community and exhibits various levels of patchiness (HAURY et al., 1978). Recently, particular attention has been focused on investigating the small-scale vertical and horizontal distribution of zooplankton assemblages which are important for monitoring marine processes and disturbances to marine ecosystems (PAFFENAn investigation into th...

The Guaymas Basin (Gulf of California) is a hydrothermal vent site where thermal alteration of deposited planktonic and terrestrial organic matter forms petroliferous material which supports diverse sulfate-reducing bacteria. We explored the phylogenetic and functional diversity of the sulfate-reducing bacteria by characterizing PCR-amplified dissimilatory sulfite reductase (dsrAB) and 16S rRNA...

Effects of habitat and acclimation temperature on cholesterol contents were examined in oceanic and inshore species of copepods. The cholesterol content of five species of thermally acclimated copepods was determined, and nine species (representing six families) were sampled to assess the role of habitat temperature. The species selected have maximum habitat temperatures (and temperature tolera...

Biocrusts are major contributors to dryland nutrient cycling by regulating C, N and P inputs fluxes. However, our understanding about how the decomposition of biocrust constituents contributes soil in drylands is virtually unknown. We conducted a microcosm experiment to: i) evaluate litter dynamics two common biocrust-forming species with contrasting tissue chemistry growth form (the lichen Cla...

Abstract The traditional view is that the Arctic polar night a quiescent period for marine life, but recent reports of high levels feeding and reproduction in both pelagic benthic taxa have challenged this. We examined zooplankton community present Svalbard fjords, coastal waters, shelf break north Svalbard, during night. focused on population structure abundant copepods ( Calanus finmarchicus ...

Most global analysis on the role of copepods in food web efficiency or carbon sequestration ignore harpacticoid poecilostomatoid that are under-estimated traditional zooplankton surveys and under-studied with respect to their ecology behavior. Nevertheless, when small-mesh-size nets used these groups appear dominate abundance sometimes even biomass from Arctic tropical seas. We studied seasonal...

Krill represent a major link between primary producers and higher trophic levels in polar marine food webs. Potential links to lower levels, such as heterotrophic microorganisms, are less well documented. Here, we studied the kinetics of microbial degradation sinking carcasses two dominant krill species Thysanoessa raschii Meganyctiphanes norvegica from Southwest Greenland. Degradation experime...

Based on revision of large recent collections of the authors, the following five species are first recorded from the Czech Republic: Fannia collini d'Assis-Fonseca, 1966 (simultaneously first record in Central Europe), Fannia lugubrina (Zetterstedt, 1838), Fannia melania (Dufour, 1839), Fannia slovaca Gregor & Rozkošný, 2005, and Fannia brinae Albuquerque, 1951 (simultaneously first record from...