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Desert invertebrates live in an environment where resources alternate unpredictably between brief periods of plenty and prolonged scarcity. This book describes the adaptive strategies of desert invertebrates in acquiring energy and sustaining life under such vicissitudes. Some cooperate in foraging; others compete for resources. Some are nomadic and migrate to more favorable sites as conditions change. Others conserve energy by going into a deep dormancy until better conditions return. Still others store food during plenty and retreat underground during less favorable times.
The adaptive modes of husbanding scarce energy resources are diverse and lead to an appreciation of the intricate interactions of animals living near their environmental limits.
Sommario
1 Introduction.- 1.1 Energetics.- 1.2 Deserts and Their Environments.- 1.3 The Deserts of the World.- 1.4 Desert Invertebrates.- 2 Foraging: The Acquisition of Energy.- 2.1 Introduction.- 2.2 Optimal Foraging.- 2.3 Sit-and-Wait Foragers.- 2.4 Patterns of Active Foraging.- 2.5 Factors Influencing Foraging.- 2.6 Biotic Interactions and Foraging.- 2.7 Interactions of Factors.- 2.8 Differences Among Ant Colonies in Foraging Activity.- 2.9 Role of Learning and Memory in Foraging and Food Processing.- 2.10 Apportionment of Foraging and other Activities.- 2.11 Foraging Success.- 3 Metabolism: The Expenditure of Energy.- 3.1 Introduction.- 3.2 Metabolism and Temperature.- 3.3 Metabolism and Water.- 3.4 Metabolism and Activity.- 3.5 Metabolism and Body Size.- 3.6 Metabolism and Sex.- 3.7 Metabolism and Life-History Stage.- 3.8 Metabolism and Biological Rhythm.- 3.9 Metabolism and Depth in Ground.- 3.10 Group Effects on Metabolism.- 3.11 Depressed Metabolism as a Desert Adaptation.- 4 Budgeting of Energy.- 4.1 Introduction.- 4.2 Ingestion.- 4.3 Digestion.- 4.4 Assimilation.- 4.5 Maintenance and Activity.- 4.6 Respiratory Quotients.- 4.7 Growth.- 4.8 Reproduction.- 4.9 Egestion.- 4.10 Energy Budgets.- 4.11 Energetics of Different Life-History Stages.- 4.12 Energy Expended in Desert Adaptation.- 5 Storage: The Hoarding of Energy.- 5.1 Introduction.- 5.2 Food Storage.- 5.3 Body Reserves.- 5.4 Agriculture and Animal Husbandry.- 6 Quiescence and Dormancy: Waiting Out Energy Shortages.- 6.1 Introduction.- 6.2 Quiescence and Dormancy.- 6.3 Diapause.- 6.4 Anhydrobiosis.- 6.5 Encystment of Protozoans.- 6.6 Risks of Dormancy.- 7 Migration and Nomadism: Tracking Energy Sources.- 7.1 Introduction.- 7.2 Orthopteran Movements.- 7.3 Other Nomadic Insects in Deserts.- 7.4 Migration on a Microscale.- 8 Community Dynamics: The Flow of Energy.- 8.1 Introduction.- 8.2 Community Structure.- 8.3 Food Webs: Pathways of Energy Flow.- 8.4 Trophic Structure.- 8.5 Quantitative Cycling of Energy and Nutrients.- 8.6 Interaction of Climatic and Biotic Factors in Cycling.- 9 Overview.- References.
