Section 3 Aquatic Ecosystems K What I Know W What I Want to Find Out L What I Learned Essential Questions What are the major abiotic factors that determine the aquatic ecosystems What are transitional aquatic ecosystems and why are they important ID: 778000
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Slide1
Aquatic ecosystems are grouped based on abiotic factors such as water flow, depth, distance from shore, salinity, and latitude.
Section 3: Aquatic Ecosystems
K
What I Know
W
What I Want to Find Out
L
What I Learned
Slide2Essential Questions
What are the major abiotic factors that determine the aquatic ecosystems?What are transitional aquatic ecosystems and why are they important?What are the zones of marine ecosystems?
Aquatic Ecosystems
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Slide3Review
salinityNewsedimentlittoral zonelimnetic zoneplanktonprofundal zone
New
continued
wetlands
estuary
intertidal zone
photic zone
aphotic zone
benthic zone
abyssal zone
Aquatic Ecosystems
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Vocabulary
Slide4The Water on Earth
Aquatic environments are divided into freshwater and marine ecosystems.Only about 2.5 percent of the water on Earth is freshwater.
Aquatic Ecosystems
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Slide5Freshwater Ecosystems
Rivers and streamsWater in rivers and streams flow in one direction.The slope of the landscape determines the direction and speed of the water.Sediment is the material that is deposited by water, wind, or glaciers.
Aquatic Ecosystems
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Slide6Freshwater Ecosystems
Rivers and streamsInteractions between land and water result in differences in erosion, nutrient availability, and species composition and diversity along the course of the water.Fast moving water: less sediment and organic matter; fewer species
Slow moving water: sediment is deposited as mud, silt, and sand; supports a diversity of plant and animal species
Aquatic Ecosystems
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Slide7Freshwater Ecosystems
Lakes and pondsAn inland body of standing water is called a lake or pond.The temperature of lakes and ponds varies depending on the season.Turnover in lake water circulates nutrients and oxygen between water depths
Aquatic Ecosystems
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Slide8Freshwater Ecosystems
Lakes and pondsLakes and ponds are divided into three zones based on the amount of sunlight that penetrates the water.The littoral zone is closest to shore, shallow, and sunlight reaches the bottom.
The littoral zone is a highly productive area, with numerous producers.
Aquatic Ecosystems
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Slide9Aquatic Ecosystems
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Freshwater Ecosystems
Lakes and ponds
The
limnetic zone
is an open water area that is well lit.
Production is dominated by phyto
plankton
, free-floating autotrophs
Home to many freshwater fish
Slide10Aquatic Ecosystems
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Freshwater Ecosystems
Lakes and ponds
The
profundal zone
is the deepest part of a lake or pond.
Little light penetrates through the limnetic layer
Colder and lower in oxygen
Slide11Transitional Aquatic Ecosystems
WetlandsAreas of land such as marshes, swamps, and bogs that are saturated with water and that support aquatic plants are called wetlands.Wetlands have high levels of species diversity.
Aquatic Ecosystems
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Slide12Transitional Aquatic Ecosystems
EstuariesAn estuary is where freshwater from a stream or river meets saltwater from the ocean. Estuaries can support a variety of habitats, such as mangrove forests or salt marshes.
Aquatic Ecosystems
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Slide13Marine Ecosystems
Intertidal zoneThe intertidal zone is a narrow band where the ocean meets land.Organisms must adapt to daily changes in tides and wave action.The intertidal zone is further divided into vertical zones.
Aquatic Ecosystems
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Slide14Marine Ecosystems
Open ocean ecosystemsThe open ocean is divided into three zones: pelagic, abyssal, and benthic.The pelagic zone is further divided into two zonesThe photic zone
is shallow enough that sunlight is able to penetrate.The
aphotic zone is an area that sunlight is unable to penetrate.
Aquatic Ecosystems
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Slide15Marine Ecosystems
Open ocean ecosystemsThe benthic zone is the area along the ocean floor.In shallow areas, the benthic zone receives sunlight, as depth increases, light and temperature decrease.
Aquatic Ecosystems
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Slide16Marine Ecosystems
Open ocean ecosystemsThe deepest region of the ocean is called the abyssal zone.Water is very cold, and there is no light penetrationOrganisms depend on food materials that sink from the surface
Aquatic Ecosystems
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Slide17Marine Ecosystems
Coastal ocean and coral reefsCoral reefs are one of the most diverse ecosystems on Earth.Widely distributed in warm shallow marine waters
Aquatic Ecosystems
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Slide18Communities and Biomes
Aquatic Ecosystems
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Virtual Lab
Slide19Aquatic Ecosystems
Copyright © McGraw-Hill Education
Review
Essential Questions
What are the major abiotic factors that determine the aquatic ecosystems?
What are transitional aquatic ecosystems and why are they important?
What are the zones of marine ecosystems?
Vocabulary
photic
zone
aphotic zone
benthic zoneabyssal zone
sedimentlittoral zonelimnetic zoneplankton
profundal zonewetlandsestuary
intertidal zone