نتایج جستجو برای: freshwater ecosystem

تعداد نتایج: 107604  

Journal: :Revue scientifique et technique 2010
F Gherardi

After habitat destruction, invasive alien species are the second leading cause of biodiversity loss, particularly in freshwater ecosystems. They also alter the structure and functioning of ecosystems, lead to biotic homogenisation, and eventually threaten human economies and health. This review aims to synthesise some of the existing information about the world distribution, vectors of spread, ...

2005
Dan Seidov Ronald J. Stouffer Bernd J. Haupt

Using an atmosphere–ocean coupled model, the climate response to an idealized freshwater input into the Southern Ocean is studied. In response to the freshwater input, the surface waters around Antarctica freshen and cool. As the addition of freshwater continues, the fresh, surface anomalies spread throughout the world ocean in contrast to ocean-only experiments and North Atlantic experiments u...

2013
E. - M. Kyrö V. - M. Kerminen A. Virkkula M. Dal Maso J. Parshintsev J. Ruı́z - Jimenez L. Forsström H. E. Manninen M. - L. Riekkola P. Heinonen M. Kulmala

Over Antarctica, aerosol particles originate almost entirely from marine areas, with minor contribution from long-range transported dust or anthropogenic material. The Antarctic continent itself, unlike all other continental areas, has been thought to be practically free of aerosol sources. Here we present evidence of local aerosol production associated with melt-water ponds in continental Anta...

2016
Darren L. Ficklin Scott M. Robeson Jason H. Knouft

Characterizing the impacts of climatic change on hydrologic processes is critical for managing freshwater systems. Specifically, there is a need to evaluate how the two major components of streamflow, baseflow and stormflow, have responded to recent trends in climate. We derive baseflow and stormflow for 674 sites throughout the United States from 1980 to 2010 to examine their associations with...

2001
Jeff Albert

Proposed resolutions to the Arab-Israeli water conflict that fail to consider the introduction of alternative freshwater sources in the not-too-distant future cannot be taken seriously. Each of three major forms of freshwater supply augmentation (the “unconventional supplies”) is likely to be implemented on a widespread basis in the region, thereby substantially altering the regional water bala...

2003

Agriculture currently consumes 70% of the world's developed fresh water supplies. By improving the productivity of water used for agriculture by 40%, it is possible to reduce the amount of additional freshwater withdrawals needed to feed the world's growing population to 0.

2014
Lauren Hartnett Bernard Fried Joseph Sherma

This review examines the methods used to study carboxylic acids and the results of such studies on certain acids in freshwater snails. The three areas of carboxylic acid interest considered in this review involve their roles as metabolites, phagostimulants, and biomarkers. The chromatographic and non-chromatographic methods used to study the carboxylic acids in the snails are considered herein....

2016
Lovisa Wennerström

List BLOCKINof BLOCKINpapers I. (2016). Genetic landscape with sharp discontinuities shaped by complex demographic history in moose (Alces alces). stable, weak genetic structuring in brackish water Northern pike (Esox lucius) in the Baltic Sea indicates a contrasting divergence pattern relative to freshwater populations. (2016). Canadian Jour‐ nal BLOCKINof BLOCKINFisheries BLOCKINand BLOCKINAq...

2005
David N Thomas Thomas Mock

The Biochemist — February 2005. © 2005 Biochemical Society 12 of metres thick. The majority of the ice in the Southern Ocean lasts only less than 1 year, and the average Antarctic sea ice thickness is 1 m. In contrast, in the Arctic Ocean sea ice can last several years and the average thickness is generally 2 m. When ice forms from freshwater, the result is a hard brittle solid with the primary...

2004
Gennady G. Matishov Vladimir V. Denisov Sergey L. Dzhenyuk Oleg V. Karamushko Dag Daler

Fisheries in the North Atlantic, southeast Atlantic, and eastern central Atlantic reached their maximum production levels one or two decades ago and are now showing a declining trend in total catches (1). The declining catches are consistent with observations that these areas have the highest incidence of overexploited stocks, depleted stocks or slowly recovering stocks that have been depleted ...

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