2.9 Major Aquatic Ecosystems Pages 60-62

Freshwater Ecosystems salt concentration below 1% Puddles Ponds Rivers Streams Lakes

Rivers and Streams Run from high elevations to low elevations

Animals that live in rivers and streams Organisms must swim or anchor themselves to the bottom

Plants

Freshwater Ecosystems Oligotrophic lake Deep Cold Nutrient poor Clear

Plants that live in oligotrophic lakes Few algae Few rooted plants

Animals that live in oligotrophic lakes Lake troutsmall mouth bass crayfish

Eutrophic Lakes High in nutrients Many plants and algae Cloudy with microscopic plankton

Eutrophic Lakes Lots of algae and rooted water plants

Eutrophic Lake Animals Very biodiverse

Wetlands and Bogs Shallow water Saturated soils Nutrient rich Filters water Huge biodiversity

Marsh

Bog

Wetlands

Watershed An area of land through which all water drains into a single river or lake.

Marine Ecosystems Important part of water cycle 3% salt concentration Produce oxygen Absorbs carbon dioxide

Oceans Support little life Open ocean is nutrient poor and deep ocean is too dark for plants

Oceans Continental shelves Rich in nutrients Huge biodiversity

Oceans Cover 70% of Earth’s surface

Coral Reefs Warm shallow oceans Huge biodiversity Tourism Sensitive

Estuaries Fresh water and saltwater environments mix Shellfish Rich in nutrients

Mangroves Along tropical and semitropical sandy shorelines Prevent erosion

The Intertidal Zone The area between high tide and low tide 2 tides a day Summer and winter extremes and wave action Seaweeds Barnacles Sea stars urchins

Intertidal zones