04:19 Jan 4, 2009 |
English language (monolingual) [PRO] Tech/Engineering - Fisheries | |||||||
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| Selected response from: Kathryn Litherland United States Local time: 08:14 | ||||||
Grading comment
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standard quantity of scales according to the local habitat or environment Explanation: Note the meaning of "scale" from the Merriam-Webster monolingual English dictionries, one of the best: 3scale Function: noun Etymology: Middle English, from Anglo-French escale, eschale, of Germanic origin; akin to Old English scealu shell, husk — more at shell Date: 14th century 1 a: a small, flattened, rigid, and definitely circumscribed plate forming part of the external body covering especially of a fish b: a small thin plate suggesting a fish scale <scales of mica> <the scales on a moth's wing> c: the scaly covering of a scaled animal And, of course, "unit" in the scientific sense is the standard measurement, and "habitat" is the environment. Hence, I assume this is what is meant. Mike :) |
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"habitat-unit scale" Explanation: Scale is a fundamental concept in mapping any habitat. (http://www.csc.noaa.gov/benthic/mapping/analyzing/scale.htm) Habitat is described by a combination of physical, chemical, and biological conditions, in which organisms can live. Habitat is spatially heterogeneous and temporally variable. In flowing water ecosystems, habitat is primarily dependent on the flow stage and channel geomorphology. In any reach of channel, features of importance to aquatic organisms can be, and usually are, delineated as a mosaic of habitat units, where a habitat unit is defined in terms of the specific environmental needs of an organism and related to features of the environment. (http://www.iisgcp.org/research/projects/coast/rcp0404.htm) -------------------------------------------------- Note added at 4 hrs (2009-01-04 08:41:01 GMT) -------------------------------------------------- Habitat variables are generally measured at the habitat unit scale (e.g. pool, riffle, or glide), they should also be assessed at the stream reach scale of ... http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6T... |
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statistical measurements for specific types of fish habitats Explanation: "scale" here refers to a type of statistical measurement A "habitat unit" is a specific type of environmental condition within an animal's overall habitat that is used when making statistical samples in wildlife studies. "A Timber, Fish and Wildless habitat unit is defined as a variation in hydraulic conditions, such as velocity and water depth. Dominant habitat segments were assigned a unique identification number and placed in one of the following habitat unit classifications: (1) Riffle, (2) Riffle/Shallow pool, (3) Riffle/Pool, (4) Pool/Riffle, (5) Deep Glide, (6)Shallow Glide, (7)Pond, and (8) Dry Channel." http://www.washingtontrout.org/islandco/fishhabitat.html So in sum, it is talking about specific statistical measurements (such as population densities of various species of fish) for different types of fish habitat. |
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