Presentation on theme: "Sara Painter and Vanessa Thulsiraj"— Presentation transcript:
1Sara Painter and Vanessa Thulsiraj Stay in the ZoneSara Painter and Vanessa Thulsiraj
2Ocean Zones Categorized by light, depth and distance
3Photic versus Aphotic zone Sunlight Availability Euphotic zone- portion of photic zone where photosynthesis occurs0-200 metersThe sunlit zoneCritters:Aphotic zone:200 meters to ocean floorLittle to no sunlit zone
4Intertidal, Neritic and Oceanic Zones Distance from coastal shoreline Intertidal zone = area between high and low tideNeritic zone = area between the low tide and continental shelfOceanic zone = area beyond the continental shelf (open ocean)CrittersIntertidal zone= harsh area to live because of constantly changing environment due to crashing waves, periodic dry periods, and rapidly changing temperatures, salinity and oxygen levels. The tidepools reside in the intertidal zone showing that some species are well adapted to this constantly changing environment.Critters: Sea anemome, mussels, barnacles, crabs,Neritic zone= rich in biomass and species, only 5% of ocean but supports 90% of commercial fisheries. Ideal habitat due to light, photosynethesis can occur, nutrients are available from land masses, shallow bottom provides shelter and habitats. The neritic zone lies entirely within the photic zone. Bacteria, bluefin tuna, mackarel, algae, sea turtles, dophins, plankton, eelsOceanic zone= known as open ocean, it lacks nutrients, resulting in smaller populations as compared to the neritic zone.
5Pelagic, Benthic and Abyssal Zones Water Depth Pelagic zone = all depths of the open ocean.Benthic zone = all sea bottom surfacesAbyssal zone = part of benthic zone in deep ocean floor (abyssal plains)Critters
6Benthos Benthos means “bottom” Any organisms living on or in the ocean bottomMost found in shallow costal ocean floorExamples include sea stars, corals, crabs, seaweeds, snails, sea cucumbers, and sea squirts
7Nekton Nekton means “swimming” Any organisms that is strong enough to move against the ocean currents, by swimming or propulsionCan determine their position in environment and some are capable of migrating long distancesInclude many adult fish, adult squid, marine mammals and marine reptiles
8Plankton Plankton means “drifter” or “wanderer” Any organisms that is not strong enough to swim against the currentsPhytoplankton = plants which need light for photosynthesisZooplankton = small animals that feed on other plankton
9The Sinking Problem All plankton must stay in the photic zone Either they need sunlight for photosynthesisOr they are part of a food chain who’s foundation is phytoplanktonPhytoplankton are the basis of the marine food chain
10Phytoplankton produce half of the worlds oxygen! Kinda a “why should you care” slide
11Form and Function Plankton avoid sinking by: increasing their surface areaor decreasing their densitySpines and flattened bodiesThis could be used to review after the activity:You can make a worksheet to go with this lesson, if desired. Students could also do a lab write up or some follow up questions. An example follow up question would be:1. estimate the time it would take the slowest and fastest plankton you observed to sink below the photic zone given their sinking rate. This requires that students actually time the sinking rate of their plankton using a stopwatch.