STREAM ECOLOGY & SELF PURIFICATION: An Introduction - Chapter 14 (end) pptx

... a 14. 39 d 14. 40 b 14. 41 b 14. 42 a 14. 43 b 14. 44 c 14. 45 b 14. 46 c 14. 47 b 14. 48 c 14. 49 a 14. 50 b 14. 51 c 14. 52 c 14. 53 c 14. 54 b 14. 55 c 14. 56 c 14. 57 d 14. 58 a 14. 59 ... 14. 59 b 14. 60 d 14. 61 Food web 14. 62 Sulfur 14. 63 b 14. 64 a 14. 65 b 14. 66 Carbon dioxide 14. 67 Saltation 14. 68 Precipitation 14. 69 Objectives 14. 70 Diss...

Ngày tải lên: 12/08/2014, 04:22

... flow, and the speed of flow changes to form a river. As it changes speed and slows, the river bot- tom changes from rock and stone to silt and clay. Plants begin to grow, stems thicken, and ... shape channels, or move signifi- cant quantities of sediment in all but sand-bed streams, which can experience change more rapidly. During extreme events, the greatest scour occurs, and the ......

Ngày tải lên: 12/08/2014, 04:22

... Sediments Animal 'N' Excretion I Ammonia ++ Organic Nitrogen as Amino Acids Figure 3.3 Nitrogen cycle. the topic of stream ecology and self- purification, it is important to ... compounds. However, an important distinction between cycling of sulfur and cycling of ni- trogen and carbon is that sulfur is "already fixed." That is, plenty of sulfate an-...

Ngày tải lên: 12/08/2014, 04:22

... Community ecology- the study of the structure and dynamics of animal and plant commu- nities. Population ecology provides modeling tools that can be used for predicting corn- munity structure and ... abandonment, the climax oak-hickory forest was restored. 5.6 POPULATION RESPONSE TO STRESS AND STREAM ECOLOGY It is important to understand that the dynamic balance of the stre...

Ngày tải lên: 12/08/2014, 04:22

... the major determinant of stream water chem- istry locally as well. These "determinants" of stream water chemistry are actu- ally the stream& apos;s "DNA." More specifically, ... and very basic form. The intent has been to lay a foundation upon which the focus of this text, stream ecology and self- purification, can be built. Beginning with an introductio...

Ngày tải lên: 12/08/2014, 04:22

... suspended or- ganisms, the plankton, such as phytoplankton (plants) and zooplankton (ani- mals), and some consumers such as insects and fish. Plankton are small organ- isms that can feed and reproduce ... species present in any one part of the stream. Such balance ensures that there is never an overabundance of one species. Nature structures the stream environment so that plant and...

Ngày tải lên: 12/08/2014, 04:22

... pesticides, cleaning sol- vents, and many others-organic chemicals (6) Insoluble particles of soil, silt, and other inorganic and organic materials that can remain suspended in water-sediment ... salts, toxic metals, and their compounds-water-soluble inorganic chemicals (4) Water-soluble nitrate and phosphate salts-inorganic plant nutrients (5) Insoluble and water-soluble oil, gasolin...

Ngày tải lên: 12/08/2014, 04:22

... purification of or- ganic matter only. In this chapter, organic stream pollution and the self- purifi- cation process will be discussed. 12.2 SOURCES OF STREAM POLLUTION Sources of stream pollution ... Company, Inc. Sources of Stream Pollution 159 the "aquarium." However, if the stream biota are not capable of self- purifying, then the stream may become a lif...

Ngày tải lên: 12/08/2014, 04:22

... the left and right stream banks separately. Define the "left" and "right" banks by standing at the downstream end of the study stretch and look up- stream. Each bank is evaluated ... time of day and seasons. There are three fundamental sizes of plankton: nannoplankton, microplankton, and macroplankton. The smallest are nannoplankton that range in size from 5-6...

Ngày tải lên: 12/08/2014, 04:22

... process- and system-level research (Swift et al., 1994a) and between farmer-led and scientist-led investigation creates a con- tinuous and integrated process of technology development and adoption ... organisms mediate both the synthesis and decomposition of soil organic matter (SOM) and therefore influence cation exchange capacity; the soil N, S, and P reserve; soil acidity and toxicity; and...

Ngày tải lên: 11/08/2014, 15:20