Evolutionary Biogeography

Evolutionary Biogeography - Evolutionary Biogeography •...

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Evolutionary Biogeography
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What is Biogeography? Geographic distribution of organisms. Describe and understand patterns. Interprets aspects of both ecology and evolutionary biology.
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Why is it important? Need to understand a species’ ecological requirements. Biotic Abiotic
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Questions explored in this chapter: How did a species come to occupy its present range? How have geological events shape distribution? Why are some closely related species confined and others widely separated?
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Ecological Factors Affecting Distributions of Marine Mammals Water temperature Patterns of food distribution Other factors discussed in later chapters: Buoyancy Resistance Osmotic challenges Heat loss
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Water Temperature and Sea Ice Sea water colder than core body temperature. Adaptations of large body size and fusiform shape serve to reduce heat loss. Heat loss still ~25X that of air. SST highest at equator and decrease with increasing latitude toward both poles. SST used to establish marine climate zones (see Plate 2a in text at back of book).
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Sea ice forms in polar and subpolar zones and reaches maximum extent in winter. Cycles limits most marine mammals to
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This note was uploaded on 10/13/2008 for the course BIOL 4865 taught by Professor X during the Spring '08 term at University of New Brunswick.

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Evolutionary Biogeography - Evolutionary Biogeography •...

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