T.R. Southwood's Books

Ecological Methods

With Particular Reference to the Study of Insect Populations

By: T.R. Southwood

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Ecological Methods

With Particular Reference to the Study of Insect Populations

By: T.R. Southwood

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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Page Count

548

Publisher

Springer Science & Business Media

Published Date

ISBN 10

9401572917

ISBN 13

9789401572910

Invertebrate Conservation and Agricultural Ecosystems

By: T. R. New

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Invertebrate Conservation and Agricultural Ecosystems

By: T. R. New

Invertebrate Conservation and Agricultural Ecosystems explores the diverse interests of invertebrate conservation and agricultural production. It is both an introduction to invertebrate conservation biology for agriculturists and an introduction to crop protection for conservation biologists, demonstrating how these two disparate fields may draw on each other for greater collective benefit. It draws on recent literature to show how invertebrate conservation in highly altered landscapes may be promoted and enhanced. The book deals with problems of, and approaches to, invertebrate conservation in highly managed agricultural ecosystems, and how biodiversity may be promoted without compromising agricultural production. It draws attention to the importance of invertebrates in agricultural systems and their role in ecosystem functions.

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Page Count

369

Publisher

Cambridge University Press

Published Date

ISBN 10

0521825032

ISBN 13

9780521825030

Hymenoptera and Conservation

By: T. R. New

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Hymenoptera and Conservation

By: T. R. New

Hymenoptera, the bees, wasps and ant, are one of the largest insect orders, and have massive ecological importance as pollinators and as predators or parasitoids of other insects. These roles have brought them forcefully to human notice , as governors of some key ecological services that strongly influence human food supply. Recent declines of pollinators and introductions of alien pests or biological control agents are only part of the current concerns for conservation of Hymenoptera, and of the interactions in which they participate in almost all terrestrial ecosystems. Both pests and beneficial species abound within the order, sometimes closely related within the same families. Many taxa are both difficult to identify, and very poorly known. This global overview, the first such account for the whole of the Hymenoptera, discusses a broad range of themes to introduce the insects and their conservation roles and needs, and how their wellbeing may be approached. The book is intended as a source of information for research workers, students, conservation managers and naturalists as an introduction to the importance of this dominant insect order.

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Page Count

186

Publisher

John Wiley & Sons

Published Date

ISBN 10

1118381327

ISBN 13

9781118381328

Insect Species Conservation

By: T. R. New

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Insect Species Conservation

By: T. R. New

This book brings together scattered information on insect conservation, providing a robust foundation for future progress, using examples from around the world.

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Page Count

273

Publisher

Cambridge University Press

Published Date

ISBN 10

0521510775

ISBN 13

9780521510776

Lepidoptera and Conservation

By: T. R. New

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Lepidoptera and Conservation

By: T. R. New

The third in a trilogy of global overviews of conservation of diverse and ecologically important insect groups. The first two were Beetles in Conservation (2010) and Hymenoptera and Conservation (2012). Each has different priorities and emphases that collectively summarise much of the progress and purpose of invertebrate conservation. Much of the foundation of insect conservation has been built on concerns for Lepidoptera, particularly butterflies as the most popular and best studied of all insect groups. The long-accepted worth of butterflies for conservation has led to elucidation of much of the current rationale of insect species conservation, and to definition and management of their critical resources, with attention to the intensively documented British fauna ‘leading the world’ in this endeavour. In Lepidoptera and Conservation, various themes are treated through relevant examples and case histories, and sufficient background given to enable non-specialist access. Intended for not only entomologists but conservation managers and naturalists due to its readable approach to the subject.

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Page Count

231

Publisher

John Wiley & Sons

Published Date

ISBN 10

1118409256

ISBN 13

9781118409251

Beetles in Conservation

By: T. R. New

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Beetles in Conservation

By: T. R. New

Beetles, the most diverse group of insects, are often abundant in terrestrial and freshwater ecosystems. Many species are under threat from human changes to natural environments, and some are valuable tools in conservation, because they respond rapidly to changes that occur. Knowledge of these responses, of both abundance and composition of assemblages, enable use of some beetles to monitor environmental changes. Beetles impinge on humanity on many ways: as cultural objects, desirable collectables, major pests and competitors for resources need by people, as beneficial consumers of other pests, and by ensuring the continuity of vital ecological processes. This book is the first major global overview of the importance of conservation of beetles, and brings together much hitherto scattered information to demonstrate the needs for conservation, and how it may be approached. It is a source of value to students, research workers, conservation biologists and ecosystem managers as an introduction to the richness and importance of this predominant component of invertebrate life.

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Page Count

261

Publisher

John Wiley & Sons

Published Date

ISBN 10

1444332597

ISBN 13

9781444332599

Book's by T.R. Southwood

Ecological Methods

Ecological Methods

Invertebrate Conservation and Agricultural Ecosystems

Invertebrate Conservation and Agricultural Ecosystems

Hymenoptera and Conservation

Hymenoptera and Conservation

Insect Species Conservation

Insect Species Conservation

Lepidoptera and Conservation

Lepidoptera and Conservation

Beetles in Conservation

Beetles in Conservation

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