Transcript Ocean Zones
Do Now Sit SILENTLY, stay silent, and answer the following questions in your notes please. Describe estuaries and explain their importance. What part of the water cycle can cause an estuary to become polluted? Explain the process of upwelling and explain why it is essential to life. How is upwelling increased in estuaries? In Ocean Zones Lifestyles Ocean Zones (shoreline to open ocean) Intertidal Zone Neritic Zone Oceanic Zone Benthic Zone Intertidal Neritic Zone Zone Continental Shelf Oceanic Zone Sunlight Benthic Zone Intertidal Zone Intertidal Zone Continental Shelf Area between high tide line and low tide line Organisms adapted to harsh, changing environments Neritic Zone Neritic Zone Continental Shelf Area over the continental shelf Continental shelf – The outer edge of a continent Area of greatest density and diversity of marine life Oceanic Zone Oceanic Zone Continental Shelf From the end of the continental shelf out to open ocean Benthic Zone The Ocean Floor Underlies all the other zones Benthic Zone Stop and Check #1 Which zone has the biggest diversity of life? Why do you think that is? Ocean Zones from Surface to Floor Now we are going to look at ocean zones from the surface to the floor and the ocean life that lives in them. Epipelagic Zone Mesopelagic Zone 0 200 1000 Bathypelagic Zone 4000 Abyssopelagic Zone 6000 Hadopelagic Zone 11,000 Ocean Zones (surface to ocean floor) Epipelagic Zone • Photic Zone or Sunlight Zone Mesopelagic Zone • Disphotic Zone or Twilight Zone Bathypelagic Zone • Aphotic zone or Midnight Zone Abyssopelagic Zone • Aphotic Zone or Midnight Zone Hadopelagic Zone • Aphotic Zone or Midnight Zone Epipelagic Zone Epipelagic Zone Sunlight Zone 0m 200m Photic Zone Photic Zone Enough sunlight for photosynthesis Primary area of food production From surface down to about 200 meters Stop and check #2 Why would this be the best place for food production to take place? Mesopelagic Zone Mesopelagic Zone 200m 1,000m Dysphotic Zone Not enough sunlight to support photosynthesis From about 200 m down to 1,000 m Stop and check #3 Would you find more or less life in this level? Why? Midnight Zones 1,000m Midnight Zone 11,000m No sunlight From 1,000 m down to ocean floor, or around 11,000 m Low density and diversity of marine life Bathypelagic Zone Bathypelagic Zone 1,000m 4,000m No sunlight From 1,000 m down to 4,000 m Low density and diversity of marine life Abyssopelagic Zone Abyssopelagic Zone 4,000m 6,000m No sunlight From 4,000 m down to 6,000 m Low density and diversity of marine life Hadopelagic Zone Hadopelagic Zone 6,000m 11,000m No sunlight From 6,000 m down to ocean floor, or around 11,000 m Low density and diversity of marine life Stop and check #4 In the midnight zones, why is there less abundance and diversity of life? What process by microbes has to occur for the food chain to be productive at these depths? Where do they get their nutrients from? Lifestyles in the Zones 3 Basic Lifestyles: •Plankton •Nekton •Benthos Plankton Floaters or very poor swimmers Plankton divided into 2 groups: •Phytoplankton – producers, photosynthesizers •Zooplankton – consumers Stop and check #5 Where do the 2 types of plankton get their energy from? Phytoplankton Must live in the photic zone Most abundant in shallow coastal areas or in upwelling zones The basis of the oceanic food web Nekton (swimmers) Free swimmers Maneuver actively in the water column Found in the water column from surface to ocean floor Nekton (swimmers) 5 Categories: • Reptiles • Mammals • Fish • Arthropods • Mollusks Nekton (swimmers) Marine Reptiles: •Turtles •Snakes •Crocodiles •Iguanas Nekton (swimmers) Marine Mammals: • Whales • Seals • Otters • Manatees • Dolphins Nekton (swimmers) Bony Fish: •Tuna •Barracuda •Eels •Angler Fish Nekton (swimmers) Cartilaginous Fish •Sharks •Rays •Skates Nekton (swimmers) Marine Arthropods •Shrimp Mollusks •Squid •Octopi Benthos (bottom dwellers) Live either on or attached to the bottom Primarily filter feeders or scavengers Benthos (bottom dwellers) 2 Basic Types: •Sessile - Live attached to the bottom •Vagrant - Able to move about Benthos (bottom dwellers) Sessile: • Barnacles • Sponges • Corals • Sea Anemones • Oysters • Clams Benthos (bottom dwellers) Vagrant: • Crabs • Sea Stars • Sea Cucumbers • Sea Urchins • Brittle Stars Exit Ticket Why is the biggest diversity of life located in shallow water or close to the shore? How do the creatures living in the deeper benthos layers get their food? Why are phytoplankton essential to life in the ocean?