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Author: T.R. Southwood
Publisher: Springer Science & Business Media
ISBN: 9401572917
Category : Science
Languages : en
Pages : 548
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Book Description
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.
Author: T.R. Southwood
Publisher: Springer Science & Business Media
ISBN: 9401572917
Category : Science
Languages : en
Pages : 548
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Book Description
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.
Author: Paul W. Murphy
Publisher:
ISBN:
Category : Soil animals
Languages : en
Pages : 416
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Book Description
Methods of sampling and analysis - statistical aspects; Extraction processes and accessory techniques; Site characteristics with particular reference to pedological aspects.
Author: T. R. E. Southwood
Publisher: John Wiley & Sons
ISBN: 1444312308
Category : Science
Languages : en
Pages : 594
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Book Description
This classic text, whose First Edition one reviewer referred to as"the ecologists' bible," has been substantially revised andrewritten. Not only have the advances made in the field since theSecond Edition been taken into account, but the scope has beenexplicitly extended to all macroscopic animals, with particularattention being paid to fish as well as other vertebrates. Ecological Methods provides a unique synthesis of themethods and techniques available for the study of populations andecosystems. Techniques used to obtain both absolute and relativepopulation estimates are described, and approaches to the directmeasurement of births, deaths, migration and the construction andinterpretation of life tables are reviewed. The text is extensively illustrated, clearly describing a widerange of equipment and methods of analysis. Comprehensive andup-to-date bibliographies to each chapter fully cover the relevantliterature, and references are given to available computer programsand internet addresses. The book has an active web site providingadditional illustrations, details of equipment and programs, andreferences to work published since the revision was completed. Likethe earlier editions, this book will be an indispensable source ofreference to researchers and students at all levels in the fieldsof ecology, entomology and zoology. Completely revised and rewritten edition of a classic. Scope extended to all macroscopic animals, notably fish andother vertebrates. Active web site displaying additional material. References to computer programmes and internet addressesthroughout the text. Affordable paperback.
Author: Sir Richard Southwood
Publisher: Springer
ISBN:
Category : Juvenile Nonfiction
Languages : en
Pages : 556
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Book Description
Introduction to the study of animal populations; The sampling programme and the measurement and description of dispersion; Absolute population estimates using marking techniques; Absolute population estimates by sampling a unit of habitat - air, plants, plant products and vertebrate hosts; Absolute population estimates by sampling a unit of habitat - soil and litter; Absolute population estimates by sampling a unit of habitat - fresh-water habitats; Relative methods of populations measurement and te derivation of absolute estimates; Estimates based on products and effects of insects; Observational and experimental methods for the estimation of natality, mortality and dispersal; The construction, description and analysis of age-specific life-tables; Age-grouping of insects, time-specific life-tables and predictive population models; Systems analysis and modelling in ecology; Diversity, species packing and habitat description; The estimation of productivity and the construction of energy budgets.
Author: University of California (System). Institute of Library Research
Publisher:
ISBN:
Category : Library catalogs
Languages : en
Pages : 876
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Book Description
Author: Paul Russell Day
Publisher:
ISBN:
Category : Soil science
Languages : en
Pages : 166
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Book Description
Author:
Publisher:
ISBN:
Category : Union catalogs
Languages : en
Pages :
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Book Description
Includes entries for maps and atlases.
Author: Arthur James Wells
Publisher:
ISBN:
Category : Bibliography, National
Languages : en
Pages : 1388
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Book Description
Author: International Association of Agricultural Librarians and Documentalists
Publisher:
ISBN:
Category : Agricultural libraries
Languages : en
Pages : 402
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Book Description
Author: Vincent Schultz
Publisher: Springer Science & Business Media
ISBN: 1468440349
Category : Medical
Languages : en
Pages : 303
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Book Description
During the twenty years the authors have been associated with the field of radiation ecology, there has been a diversified and increasing use of radionuclides in applied and basic biological research. Prior to the advent of the atomic age in the 1940s the use of radionuclides as tracers was initiated, and following that period one observed a dramatically increased use in many disciplines. Concurrent with this increase there appeared many books and articles on radionuclide tech niques useful to biologists in general. Although only a few ecological applications were evident in these early years, ecologists were quick to see the opportunities available in their field. In the United States, major centers for such activities included Oak Ridge National Laboratory and the U. S. Atomic Energy Com mission's Savannah River Plant. At Oak Ridge National Laboratory Dr. Stanley I. Auerbach, director of ecological activities, encouraged with remarkable suc cess the use of tracers by his associates. Dr. Eugene P. Odum had the foresight to see that radionuclide tracers provided the means to solve many problems of interest to ecologists. Consequently, his research included some unique radio tracer applications at the Savannah River Plant. In addition he encouraged others involved in ecological activities at the Savannah River Plant to do likewise. Ecologists such as Dr. Robert C. Pendleton at the U. S. Atomic Energy Com mission's Hanford Works applied radionuclides in their research. To these early investigators and to those who followed we owe the oppportunity to write this book.
