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Titlebook: Ecological Methods; With Particular Refe T. R. E. Southwood Book 1978 T. R. E. Southwood 1978 biomass.biome.ecology.ecosystem.energy.fauna.

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書目名稱Ecological Methods
副標(biāo)題With Particular Refe
編輯T. R. E. Southwood
視頻videohttp://file.papertrans.cn/302/301259/301259.mp4
圖書封面Titlebook: Ecological Methods; With Particular Refe T. R. E. Southwood Book 1978 T. R. E. Southwood 1978 biomass.biome.ecology.ecosystem.energy.fauna.
描述the virtual impossibility of extracting the many different species from a habitat with equal efficiency by a single method (e.g. Nef, 1960). 1.1 Population estimates Population estimates can be classified into a number of different types; the most convenient classification is that adopted by Morris (1955), although he used the terms somewhat differently in a later paper (1960). 1.1.1 Absolute and related estimates The animal numbers may be expressed as a density per unit area of the ground of the habitat. Such estimates are given by nearest neighbour and related techniques (Chapter 2), marking and recapture (Chapter 3), by sampling a known fraction of the habitat (Chapter 4-6) and by removal sampling and random walk techniques (Chapter 7). Absolute population The number of animals per unit area (e.g. hectare, acre). It is almost impossible to construct a budget or to study mortality factors without the conversion of population estimates to absolute figures, for not only do insects often move from the plant to the soil at different developmental stages, but the amount of plant material is itself always changing. The importance of obtaining absolute estimates cannot be overemphasized
出版日期Book 1978
關(guān)鍵詞biomass; biome; ecology; ecosystem; energy; fauna; fertility; growth; insects; plankton; soil; vegetation
版次1
doihttps://doi.org/10.1007/978-94-009-5809-8
isbn_softcover978-94-009-5811-1
isbn_ebook978-94-009-5809-8
copyrightT. R. E. Southwood 1978
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The Estimation of Productivity and the Construction of Energy Budgets,ements in the field (Pearson, 1954; Stiven, 1961), although the quality of the food in terms of specific amino-acids, vitamins and other constituents will also be important (Boyd & Goodyear, 1971; Iversen, 1974; Schroeder, 1977; Onuf ., 1977; McNeill & Southwood, 1978).
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