Ecological Methods

Name: Ecological Methods
Brand: Chapman and Hall
SKU: 9780412307102
Price: 682.21 PLN
Availability: InStock

With Particular Reference to the Study of Insect Populations

Autor: T.R. Southwood

Język:

Oprawa: Miękka

Wydawca: Chapman and Hall

Dostępność: Dostępna u dostawcy w małych ilościach

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the virtual impossibility of extracting the many different species from a habitat with equal efficie...

Informacje o książce

Autor

T.R. Southwood

Język

Angielski

Oprawa

Książka - Miękka

Data wydania

1987

strony

548

EAN

9780412307102

ISBN

0412307103

Enbook ID

02166280

Wydawca

Chapman and Hall

Waga

910

Wymiary

155 x 235 x 31

Pełny opis

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.

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Ecological Methods

With Particular Reference to the Study of Insect Populations

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