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      Rise and fall of jellyfish in the eastern Bering Sea in relation to climate regime shifts

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          Climate-driven trends in contemporary ocean productivity.

          Contributing roughly half of the biosphere's net primary production (NPP), photosynthesis by oceanic phytoplankton is a vital link in the cycling of carbon between living and inorganic stocks. Each day, more than a hundred million tons of carbon in the form of CO2 are fixed into organic material by these ubiquitous, microscopic plants of the upper ocean, and each day a similar amount of organic carbon is transferred into marine ecosystems by sinking and grazing. The distribution of phytoplankton biomass and NPP is defined by the availability of light and nutrients (nitrogen, phosphate, iron). These growth-limiting factors are in turn regulated by physical processes of ocean circulation, mixed-layer dynamics, upwelling, atmospheric dust deposition, and the solar cycle. Satellite measurements of ocean colour provide a means of quantifying ocean productivity on a global scale and linking its variability to environmental factors. Here we describe global ocean NPP changes detected from space over the past decade. The period is dominated by an initial increase in NPP of 1,930 teragrams of carbon a year (Tg C yr(-1)), followed by a prolonged decrease averaging 190 Tg C yr(-1). These trends are driven by changes occurring in the expansive stratified low-latitude oceans and are tightly coupled to coincident climate variability. This link between the physical environment and ocean biology functions through changes in upper-ocean temperature and stratification, which influence the availability of nutrients for phytoplankton growth. The observed reductions in ocean productivity during the recent post-1999 warming period provide insight on how future climate change can alter marine food webs.
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            Empirical evidence for North Pacific regime shifts in 1977 and 1989

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              Generalized linear and generalized additive models in studies of species distributions: setting the scene

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                Author and article information

                Journal
                Progress in Oceanography
                Progress in Oceanography
                Elsevier BV
                00796611
                May 2008
                May 2008
                : 77
                : 2-3
                : 103-111
                Article
                10.1016/j.pocean.2008.03.017
                © 2008

                http://www.elsevier.com/tdm/userlicense/1.0/

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