Ecological significance

Oxidation-rednction reactions of iron and manganese on nntrient release/retention can occur as follows  

---

The Institute for Environment and Health, The Ecological Significance of Endocrine Disruption Effects on Reproductive Ennction and Consegnences for Natural Populations, lEH, Leieester, 1999. B. Marehetti, M. C. Morale, E. Gallo, N. Baitieone, Z. Earinellaand M. Cioni, Endocrine, 1995,3,845. 

Allochthonous flora Organisms that are not indigenous to the soil but that enter soil by precipitation, diseased tissues, manure, and sewage. They may persist for some time but do not contribute in a significant way to ecologically significant transformations or interactions. 

Immediately report by telephone to the EPA regional office any spill of a hazardous chemical that seriously threatens humans with cancer, birth defects, mutation, death, or serious prolonged incapacitation, or seriously threatens the environment with large-scale or ecologically significant population destruction. A written follow-up report is required within 15 days. 

Kershaw, K.A. (1972). The relationship between moisture content and net assimilation rate of lichen thalli and its ecological significance. Canadian Journal of Botany, 50, 543-55. 

As discussed earlier (see Chapter 6, Section 6.2.5), several studies have linked the presence of high PAH levels in the marine enviromnent with a high incidence of tumors in fish. The ecological significance of these observations, however, is not known. 

D. Cries and M. Runge, The ecological significance of iron mobilization in wild-grasses. J. Plant Nutr. 75 1727 (1992). 

P. Bossier and W. Verstraete, Ecological significance of siderophores in soil. Adv. Microb. Ecol. /0 385 (1988). 

Johannes RE (1980) The ecological significance of the submarine discharge of groundwater. Mar Ecol Prog Ser 3 365-373... 

Spring, S. Schulze, R. Overmann, J. Schleifer, K. H. Identification and characterization of ecologically significant prokaryotes in the sediment of freshwater lakes Molecular and cultivation studies. FEMS Microbiol. Rev. 2000, 24, 573-590. 

Gallet, C., Nilsson, M.C. and Zackrisson, O. (1999). Phenolic metabolites of ecological significance in Empetrum hermaphroditum leaves and associated humus. Plant and Soil 210 1-9. 

Shore, R.F. and P.E.T. Douben. 1994. The ecological significance of cadmium intake and residues in terrestrial small mammals. Ecotoxicol. Environ. Safety 29 101-112. 

McArthur, M.L.B., G.A. Fox, D.B. Peakall, and B.J.R. Philogene. 1983. Ecological significance of behavioral and hormonal abnormalities in breeding ring doves fed an organochlorine mixture. Arch. Environ. Contam. Toxicol. 12 343-353. 

Giddings JM, Solomon KR, Maund SJ (2001) Probabilistic risk assessment of cotton pyrethroids in aquatic ecosystems 2. Aquatic mesocosm and field studies observed effects and their ecological significance. Environ Toxicol Chem 20 660-668... 

Nannipieri P, Grego S, Ceccanti B (1990) Ecological significance of the biological activity in soil. In Bollag J-M, Stotzky G (eds) Soil Biochemistry, Vol 6. Marcel Dekker, New York, pp 293-355... 

Hand in hand with the declining ecological significance of tetraorganolead compounds, the interest in such molecules is also decreasing, and comprises now mostly purely academic aspects. Most results in this field have been summarized in COMC(1982) and COMC(1995), as well as the five volumes of the Gmelin series Organoelement Compounds that appeared between 1987 and 1996.14 18... 

Filion-Myklebust C, Norton TA (1981) Epidermis shedding in the brown seaweed Ascophyllum nodosum (L) Lejolis, and its ecological significance. Mar Biol Lett 2 45-51 Foster KR, Kokko H (2006) Cheating can stabilize cooperation in mutualisms. Proc R Soc B Biol Sci 273 2233-2239... 

This acclimation phase may be of considerable public health or ecological significance because the compound is not destroyed. Hence, the period of exposure of humans, animals, or plants is prolonged, and the possibility of an undesirable effect increased. Furthermore, if the pollutant is present in flowing waters above or below ground, it may be widely disseminated laterally or vertically because of the lag of detectable biodegradation. In the case of toxicants, such increased dispersal may result in the exposure of susceptible species at distant sites before the harmful substance is destroyed. 

Structure of quaternary amines and related compounds of ecological significance. 

Blytt, H. J., Guscar, T. K., and Butler, L. G. (1988). Antinutritional effects and ecological significance of dietary condensed tannins may not be due to binding and inhibiting digestive enzymes. Journal ofChemicalEcology 14,1455. 

Lequette, B., Verheyden, C., and Jouventin, P. (1989). Olfaction in subantarctic sea-birds its phylogenetic and ecological significance. Condor91,732-735. 

Whereas a wide range of potential allelopathic agents has been identified from soil micro-organisms, it has seldom been proven that they are of true ecological significance. The minimum necessary criterion for this is that the product should occur in the form and... 

All the present evidence points to phytotoxic steam-volatile fatty acids/ particularly acetic, being a major microbiological factor responsible for the crop damage, and the conditions of ecological significance referred to earlier have been satisfied. However, the toxin is produced only in the straw tissue and its concentration declines exponentially with distance from the straw (13). A correlation of soil acetic acid content with phytotoxicity is therefore neither expected nor found. 

---