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BIOL 4150 (48)
Lecture 18

Lecture 18

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Department
Biology
Course
BIOL 4150
Professor
Andrew Mac Dougall
Semester
Fall

Description
Population Ecology Lecture NotesLecture 18Case Study Pacific SalmonHabitat requirements coldwater streams moderate to high velocity flow low sedimentation coarse gravel beds aquatic invertebrate availability for feedingOptions There are thousands of viable streams and small rivers that fit these criteriaChoices they choose the same spawning bed where they were born after leaving as a juvenile and being absent for yearswhy Because the benefits outweigh the costsBenefitsoReduced gene flow avoids outbreeding depression or the dilution of local adaptation and of specialized traitsoMaintains a winning strategy fitness consistencyoRisk what if other areas are suboptimalCostsoReduced gene flow risk of inbreeding depressionoIncreased interspecificintraspecific competitionoOther areas may be more suitableCase Study ElkMigratorysea
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