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34.4 Aquatic Ecosystems

34.4 Aquatic Ecosystems. Objectives. Compare and contrast ponds, streams, and estuaries. Compare conditions and typical organisms in the intertidal, neritic, and oceanic zones. Describe the abiotic and biotic factors that characterize coral reefs and hydrothermal vent communities. Vocabulary.

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34.4 Aquatic Ecosystems

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  1. 34.4Aquatic Ecosystems

  2. Objectives • Compare and contrast ponds, streams, and estuaries. • Compare conditions and typical organisms in the intertidal, neritic, and oceanic zones. • Describe the abiotic and biotic factors that characterize coral reefs and hydrothermal vent communities.

  3. Vocabulary • intertidal zone • neritic zone • oceanic zone • zooplankton • hydrothermal vent • photic zone • phytoplankton • aphotic zone • benthic zone • estuary • pelagic zone

  4. Ponds and Lakes • freshwater • standing, not flowing • divided into zones based on water depth and distance from shore

  5. Photic Zone • shallow, close to shore • upper area further from shore • sunlight • photosynthesis • phytoplankton • algae • cyanobacteria • water plants vague definitions eukaryotic, photosynthetic Prokaryotic, photosynthetic bacteria

  6. Aphotic Zone • deep, murky areas • not enough light for photosynthesis • video

  7. Benthic Zone • bottom of any aquatic ecosystem • rock, sand, sediment • organisms feed on waste from photic zone • soft, squishiness between your toes

  8. Streams and Rivers • freshwater • flowing • stream smaller than river • near source: cold, clear, small, empty • downstream: wider, deeper, wetlands nearby, warmer, murky, more organisms

  9. Estuaries • streams/rivers merge with ocean • change in salt concentration and temperature • nutrient-rich soil • one of most productive ecosystems • breeding, nesting • crabs, oysters, mangroves

  10. Ocean Zones • depth: benthic (floor), pelagic (open water above floor) • photic and aphotic • distance from shore: • intertidal • neritic • oceanic

  11. Intertidal Zone video • between high tide an low tide lines • pounded by waves • exposed to sun and wind • special adaptations of organisms • barnacles

  12. Neritic Zone • from low-tide line out to edge of continental shelf • fairly shallow • some sunlight • seaweed • phytoplankton • coral reefs • mollusks, sponges, sea turtles, seals

  13. Oceanic Zone • open ocean from continental shelf outward • phytoplankton • zooplankton • dolphins • whales • squid

  14. Coral Reefs video • beautiful • biologically diverse • colonies of coral polyps, animals that secrete hard exoskeletons

  15. Deep-sea Vents video • hydrothermal vents: spots on the ocean floor where hot gases and minerals escape from Earth’s interior • no sunlight • chemical energy • producers: prokaryotes that use energy from sulfur • tube worms • clams • video

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