Sea Grass Communities Vegetated, sandy substrates Vegetated, sandy substrates Shallow, clear water Shallow, clear water Tropical and subtropical habitats.

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Presentation transcript:

Sea Grass Communities Vegetated, sandy substrates Vegetated, sandy substrates Shallow, clear water Shallow, clear water Tropical and subtropical habitats Tropical and subtropical habitats Food webs often include large grazers Food webs often include large grazers –turtles –dugongs or manatees Coastal locations increase exposure to impacts from terrestrial land use Coastal locations increase exposure to impacts from terrestrial land use

Shark Bay, Australia Western Australia Western Australia Isolated Isolated World Heritage Area World Heritage Area Rare example of an “intact” seagrass ecosystem Rare example of an “intact” seagrass ecosystem

Shark Bay overview: beds and channels

Diverse algae

Anemone in seagrass

Mega Grazers

Mesograzers

Top Predator Tiger Shark

Predator effects

What regulates sea grass?

Contrast a Seagrass system near people e.g., southern Florida e.g., southern Florida Near extinction of Near extinction of –manatees –large sharks –sea turtles Addition of Addition of –coastal development –altered hydrology –increased nutrient input

Problems in Florida Bay seagrass

Changes in seagrass beds

Complexity in habitats: e.g., Big Pine Key

Complexity in distributions of organisms

Heterogeneous communities

Changes in local development

Regional Patterns: Sampling Levels

Fresh water & nutrient inputs increase chlorophyll concentrations in water

P or N nutrient limitation varies

Dry season patterns of chlorophyll

Wet season patterns of chlorophyll

Larry Brand An Evaluation of the Scientific Basis for "Restoring" Florida Bay by Increasing Freshwater Runoff from the Everglades An Evaluation of the Scientific Basis for "Restoring" Florida Bay by Increasing Freshwater Runoff from the Everglades “Taken together, these data suggest that nutrients from Everglades- agriculture runoff are being transported to not just Florida Bay, but also the Florida Keys and coral reefs, and contributing to their eutrophication.” “Taken together, these data suggest that nutrients from Everglades- agriculture runoff are being transported to not just Florida Bay, but also the Florida Keys and coral reefs, and contributing to their eutrophication.”