نتایج جستجو برای: fresh and sea water
تعداد نتایج: 16968306 فیلتر نتایج به سال:
Tardi-what? Tardigrades, also known as water bears, are a littlestudied phylum of animals. First discovered 230 years ago, there are at least 700 different species living on land, in fresh water and in the sea. The tardigrades represent a successful group of animals — in flourishing existence after about 600 million years of evolution — that could hold keys to the patterns and mechanisms by whi...
the objective of this study was to compare growth performance and feed conversion ratios of rainbow trout (oncorhynchus mykiss) and brook trout (salvelinus fontinalis) juveniles in monoculture and duo-culture in freshwater and seawater under aquarium conditions. the fish were about 2-months old hatchery-reared brook and rainbow trout with initial weights of 0.934±0.033 (n=360) and 1.014±0.019 (...
Energy transfer in microbial food webs is partly quantified by the relationship between bacterial and algal biomass. Tight spatial relationships suggest active bacterial assimilation of dissolved photosynthate in temperate marine and fresh waters. However, studies in the Antarctic suggest that bacterial biomass generation from algal-derived dissolved organic matter is highly variable across sea...
The thermodynamic balance of the Weddell Gyre is assessed from an inverse estimate of the circulation across the gyre’s rim. The gyre experiences a weak net buoyancy gain that arises from a leading-order cancelation between two opposing contributions, linked to two cells of water mass transformation and diapycnal overturning. The lower cell involves a cooling-driven densification of 8.4± 2.0 Sv...
The deep ocean is the largest and least known ecosystem on Earth. It hosts numerous pelagic organisms, most of which are able to emit light. Here we present a unique data set consisting of a 2.5-year long record of light emission by deep-sea pelagic organisms, measured from December 2007 to June 2010 at the ANTARES underwater neutrino telescope in the deep NW Mediterranean Sea, jointly with syn...
The life cycle of the sea lamprey, Petromyzon marinus, includes two metamorphoses. At the end of a period spent as a blind larva, buried in the mud of streams, a first metamorphosis prepares it to migrate downstream to the sea or a lake for its growth phase. Then, following a second metamorphosis, it migrates upstream as a sexually mature adult to spawn and die. The downstream migrants have a v...
Two natural directions of saline sea water intrusion have been registered in the lower reaches of the Neretva River: the first direction of intrusion is through the Neretva riverbed, and the second one through deeper underground layers. The numerical model of stratified flow is described, and its application in the analysis of the Neretva River salination via the first direction of intrusion is...
OBJECTIVES Fish is rich in nutrients that are favorable to bone health, but limited data are available regarding the relationship between fish intake and hip fractures. Our study examined the association between habitual fish intake and risk of hip fractures. METHODS A case-control study was performed between June 2009 and June 2012 in Guangdong Province, China. Five hundred and eighty-one hi...
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