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Ecological controls

Verity and Smetacek (1996) have argued that predation or top-down trophic effects are as important as resource-driven or bottom-up factors in structuring planktonic ecosystems. However, grazing control of phytoplankton floristic composition will only occur if secondary consumers are selective for particular algal types. Initial evidence was against such selection. Marshall (1973) reviewed the evidence for dietary restriction in copepods  [Pg.312]

It is clear that copepods can and do select particular foods but they do not do so all the time, and their preferences may change... On the whole the gut contents of a filter-feeding copepod are a good reflection of the microplankton present in the sea at the time it was feeding.. .. most copepods are neither purely herbivorous nor purely carnivorous but can change from one mode of feeding to another. [Pg.313]

This observation remains valid, as does the view (Parsons LeBrasseur, 1970 Sheldon etal., 1977) that the main variable in determining what eats what is the relative size of predator and prey. However, there have been major changes in the understanding of trophic relations since the 1970s. [Pg.313]


Current emphasis on ecological controls of the environment has prompted a number of studies of waste w disposal in RDX manuf (as well as in the manuf of other expls). The various approaches tried have been flocculation, microbiological and chemical degradation, filtration thru activated siudge, photolysis, and photolysis... [Pg.165]

Hood, E. W., M. W. Williams, and N. Caine. (2002) Ecological controls on organic and inorganic nitrogen leaching across an alpine-subalpine ecotone, Green Lakes Valley, Colorado Front Range. Ecosystems, in press. [Pg.94]

Gulyaev Yu.V. Rogalsky V.I. Krapivin V.F. Novitchikhin E.P. and Yushkov V.P. (1991). Mathematical Modeling of Natural Objects in Global Space System of Ecological Control. Institute of Radioengineering and Electronics, Russian Academy of Sciences, Report No. 2(553), Moscow, 33 pp. [in Russian]. [Pg.529]

WA Dept of Ecology. 1998. Washington State Department of Ecology. Controls for new sources of toxic air pollutants. Ch. 173-460 WAC. http //www.wa.gov/ecology/leg/ecywac.html. [Pg.297]

Apparently the number and kind of essential elements in producers is controlled and eventually Umited by their grazers , so there is some kind of ecological control. [Pg.139]

Lotze, H. K., and Worm, B. (2002). Complex interactions of climatic and ecological controls on macroalgal recmitment. Limnol. Oceanogr. 47, 1734—1741. [Pg.1066]

Ecological Controls on Alkenone Production and Downward Flux... [Pg.3248]

Sinden, J.W., 1971 "Ecological Control of Pathogens and Weed Molds In Mushroom Cuh ture" Annual Review of Phytopathology 9. [Pg.285]

Busier J. L., Moore T., Bellisario L., Comer N. and Crill P. (1995) Ecological controls on methane emissions from a northern peatland complex in the zone of discontinuous permafronst, Manitoba, Canada. Global Biogeochem. Cycles 9, 455-470. [Pg.406]

Fig. 14. Example of the ecological control of the restoration of a cave. The BTC function is available to evaluate the proposed opening of a cave after the comparison of the previewed restoration actions with the natural growth of the area and the thresholds indicating the main self-organisation structure of the ecocoenotope, from bush to forest. Fig. 14. Example of the ecological control of the restoration of a cave. The BTC function is available to evaluate the proposed opening of a cave after the comparison of the previewed restoration actions with the natural growth of the area and the thresholds indicating the main self-organisation structure of the ecocoenotope, from bush to forest.
Foote, M. (1996) Ecological controls on the evolutionary recovery of post-Paleozoic crinoids. Science, 274 1492-1495. [Pg.202]

For these purposes, systems of chemical analysis are used for ecological monitoring of the environment and ecological control over CW destruction. The appropriate analytical methods are defined by both the physico-chemical properties of chemicals and the character of the environmental factor of interest. [Pg.88]


See other pages where Ecological controls is mentioned: [Pg.3247]    [Pg.3254]    [Pg.312]    [Pg.3]    [Pg.158]    [Pg.391]    [Pg.184]    [Pg.225]    [Pg.164]    [Pg.203]    [Pg.88]   


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