Freshwater Fragmentation Effects on Brown Trout By Rowena Humphrey October 19, 2006.

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Presentation transcript:

Freshwater Fragmentation Effects on Brown Trout By Rowena Humphrey October 19, 2006

Life History Two life-history tactics: Stay in “home” freshwater stream Migrate downstream to the sea Distribution Salmo trutta L.

Habitat

Dams

Consequences of Fragmentation Water Characteristics Mobility Vegetation Genetic Diversity Habitat Components

Water Characteristics Water level Depth Temperature Velocity Discharge Turbidity Substrate

Mobility Obstructions effect: Isolation of the watershed Accessibility of tributaries Migration Difficulty depending on water level, location, and structure.

Fish Ladders

Vegetation Dramatically shifting vegetation Fluctuation between high production and mortality for terrestrial and aquatic plants

Genetic Diversity Reproductive Isolation Within Watersheds Irregular Gene Flow

Genetic Diversity Reproductive Isolation Within Watersheds Irregular Gene Flow Decreased Diversity

Ineffective Single species Localized Individual obstructions Effective Multi-species Encompass all life-stages Movement Reconstruct the sequence and structure Conservation and Restoration

Ineffective Single species localized individual obstructions Effective Multi-species encompass all life-stages Movement reconstruct the sequence and structure Conservation and Restoration Temporary solutions Long-term solutions

Sustainability Initial design Materials of construction Physical characteristics of the water systems Appropriate monitoring and maintenance programs

Global effects on biodiversity

Questions?

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