A Closer Look at the Animal Kingdom (Introduction to Biology - download pdf or read online

By Sherman Hollar

ISBN-10: 1615305807

ISBN-13: 9781615305803

Age variety: eight - 12 Years

Table of Contents

Introduction 6

Chapter 1 the diversity of Animal lifestyles 12

Chapter 2 category and behaviour 33

Chapter three Animals with no Backbones 50

Chapter four Animals with Backbones 61

Conclusion 75

Glossary 77

For additional info 80

Bibliography 83

Index 84

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Additional resources for A Closer Look at the Animal Kingdom (Introduction to Biology - Britannica Digital Learning) (1st Edition)

Sample text

Why must a plant or animal be of direct economic benefit to humans to have worth? Economic value alone is not the only reason to preserve biodiversity. Another reason often given (but not universally accepted) to conserve biodiversity is that organisms, as components of ecosystems, provide services, and their interactions with other organisms contribute to the overall healthy functioning of ecosystems. 23 On a practical level, biologists want to know just how much the loss of a few species will reduce the quality of services within a specific ecosystem.

Few field methods have been tested for sampling caecilians, baseline distribution data for most species are poor or nonexistent, and caecilian taxonomy is inadequate. Gower and Wilkinson reported that although unequivocal declines have not been documented, some claims of caecilian declines have been made. In most cases the main cause of perceived declines is thought to be habitat destruction, although these reports are anecdotal and lack clear evidence. ” Baseline studies currently are being conducted; quantitative field studies are badly needed to assess whether or not populations of these amphibians are declining.

Harlequin frogs (genus Atelopus) range from Costa Rica south to Bolivia and eastward through the Amazon Basin into the Guyanas. Thirty of 53 species for which sufficient data are available to decipher population trends have disappeared entirely from their known Declining Amphibian Populations and the Biodiversity Crisis 8. 9. 10. 11. 12. 13. 14. 15. 16. 17 localities. Many other species have declined. 55 Populations of at least 24 species of anurans from the Andes of Ecuador have declined or gone extinct since the late 1980s.

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A Closer Look at the Animal Kingdom (Introduction to Biology - Britannica Digital Learning) (1st Edition) by Sherman Hollar


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