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Marine ecosystems abundance

Oviatt, C.A., Lane, P., French, F., and Donaghay, P. (1989) Phytoplankton species and abundance in response to eutrophication in coastal marine ecosystems. J. Plankton Res. 11, 1223-1244. [Pg.641]

Due to the paucity of reports, we can only speculate on the importance of marine fungi in biogeochemical cycling. Also, because of the dependence of fungi on carbon, it can be expected that their abundance will be determined mostly by the availability of carbon, which increases from the open oceans to coastal seas, to coastal and estuarine ecosystems, such as salt marshes. No doubt partly due to their relative accessibility, salt marshes are the most studied marine ecosystems in relation to fungi. [Pg.451]

The increasing availabihty of mass spectrometers and on-Hne interfaces for sample preparation has made natural abundance measurements accessible to a broad community of biological oceanographers, and stable isotope measurements are becoming a routine tool in studies of marine ecosystems. In general, measurements are now carried out with continuous flow systems that integrate a... [Pg.1286]

In vitro incubations differ from acmal ocean conditions in important ways that limit the applicability of their results to marine ecosystems. The fixed light intensity used in these experiments is a poor mimic of the variable conditions in the ocean mixed layer, while the walls of the incubation bottles themselves may provide unnatural growth surfaces. Bottle experiments cannot hope to accurately represent that nature or scale of the community response [151]. The artificial restriction on the abundance of grazers in bottle incubations, for instance, has been offered as an alternative (and confounding) explanation for the phytoplankton blooms observed in these experiments [221-223]. In an effort to overcome the limitations of bottle experiments, researchers have conducted a series of mesoscale in situ Fe enrichment experiments, in which large areas of the surface ocean were seeded with iron and the ecosystem response measured over many days. [Pg.172]

NITROGEN GAS (N2) is the most abundant compound in the earth s atmosphere (78.1% by volume). Uptake of N2 by nitrogen-fixing organisms is the primary natural source of nitrogen for terrestrial and marine ecosystems however, from a chemical kinetics point of view, reactions... [Pg.252]

Many herbivorous fishes are found on coral reefs (Horn 1989 Choat 1991) and their grazing activities are commonly the dominant factor affecting the distribution and abundance of macroalgae (e.g., Morrison 1988 Hixon and Brostoff 1996 Marques et al. 2006) as well as the structure and function of marine communities and ecosystems in general (Duffy and Hay 2001). For example, the exclusion of... [Pg.30]

Lakes, rivers, swamps, and marshes - common in temperate areas - contribute little to the diversity of natural products. Abundant dull-green grass and dull-colored fish and moUusks characterize lakes and rivers, in contrasts with the vivid colors of tropical fish and seaweeds. Haplosclerid sponges are occasionally abundant in freshwater, but their secondary metabolism is limited to demospongic acids (Dembisky 1994), in contrast with the variety of metabolites from marine sponges in the same order. Where not for cyanobacteria (which are as rich of unusual metabolites as the marine strains), tropical amphibians, and aquatic fimgi, freshwater ecosystems would have passed unnoticed in this book. [Pg.27]

All the alien species entered the Sea of Azov from the Black Sea via the Kerch Strait with currents or with ships. Selected species negatively affected the ecosystem, while the others enrich its flora and fauna [22,26,27]. Selected Black Sea fish make their seasonal migrations to the Sea of Azov for spawning and fatting. In the years with enhanced supply of the Black Sea waters, purely marine species of Mediterranean and Atlantic origins invaded the Sea of Azov. Some of them spread over the entire sea and even featured outbursts of their abundance. [Pg.81]


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Ecosystems marine

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