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Aquatic Ecosystems

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Aquatic Ecosystems

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  1. Freshwater Ponds & Lakes Streams & Rivers Wetlands Marine Oceans Coral Reefs Estuaries Aquatic Ecosystems

  2. Ponds & Lakes Streams & Rivers Wetlands Freshwater

  3. Freshwater is defined as having a low salt concentration—usually less than 1% Plants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt concentration (i.e, ocean) Freshwater

  4. Ponds and Lakes • range in size from just a few square meters to thousands of square kilometers • ponds may be seasonal, lasting just a couple of months (such as sessile pools) • lakes may exist for hundreds of years or more • may have limited species diversity since they are often isolated from one another and from other water sources like rivers and oceans

  5. Ponds and Lakes • divided into three different “zones” determined by depth and distance from the shoreline • littoral zone • limnetic zone • profundal zone

  6. Littoral Zone • warmest since it is shallow and can absorb more of the Sun’s heat • sustains a fairly diverse community, which can include several species of algae (like diatoms), rooted and floating aquatic plants, grazing snails, clams, insects, crustaceans, fishes, and amphibians • the egg and larvae stages of some insects are found in this zone • vegetation and animals living in the littoral zone are food for other creatures such as turtles, snakes, and ducks

  7. Limnetic Zone • near-surface open water surrounded by the littoral zone • well-lighted (like the littoral zone) and is dominated by plankton, both phytoplankton and zooplankton • plankton are small organisms that play a crucial role in the food chain – most life would not be possible without them • variety of freshwater fish also occupy this zone

  8. Profundal Zone • Plankton have short life spans—when they die, they fall into the deep-water part of the lake/pond • much colder and denser than the other two • little light penetrates all the way through the limnetic zone into the profundal zone • animals are decomposers

  9. Ponds and Lakes Temperature • varies seasonally. • Summer • from 4° C near the bottom to 22° C at the top • Winter • from 4° C while the top is 0° C (ice) • between the two layers is a narrow zone called the thermocline where the temperature of the water changes rapidly with depth

  10. Ponds and Lakes • during the spring and fall seasons is a mixing of the top and bottom layers resulting in a uniform water temperature of around 4° C • mixing also circulates oxygen throughout the lake • many lakes and ponds do not freeze during the winter resulting in the top layer being a little warmer

  11. Ponds and Lakes • ice can develop on the top of lakes during winter • blocks out sunlight and can prevent photosynthesis • oxygen levels drop and some plants and animals may die • called "winterkill."

  12. Ponds and Lakes

  13. Streams & Rivers • bodies of flowing water moving in one direction • found everywhere—they get their start at headwaters, which may be springs, snowmelt or even lakes • travel all the way to their mouths, usually another water channel or the ocean

  14. Watershed • describes an area of land that contains a common set of streams and rivers • drains into a single larger body of water, such as a larger river, a lake or an ocean

  15. Streams & Rivers • characteristics change during the journey from the source to the mouth • temperature is cooler at the source than it is at the mouth • water is also clearer, has higher oxygen levels, and freshwater fish such as trout and heterotrophs can be found there

  16. Streams & Rivers • Towards the middle part of the stream/river, the width increases, as does species diversity—numerous aquatic green plants and algae can be found

  17. Streams & Rivers • toward the mouth the water becomes murky from all the sediments that it has picked up upstream • decreasing the amount of light that can penetrate through the water • less light • less diversity of flora • lower oxygen levels • fish that require less oxygen, such as catfish and carp, can be found

  18. Streams & Rivers

  19. Wetlands • Wetlands are areas of standing water that support aquatic plants • Marshes, swamps, and bogs are all considered wetlands

  20. Wetlands Plants • adapted to the very moist and humid conditions are called hydrophytes Pond lilies Cattails Sedges Tamarack Black Spruce Gum Cypress

  21. Wetlands • highest species diversity of all ecosystems • many species of amphibians, reptiles, birds (such as ducks and waders), and furbearers can be found in the wetlands • not considered freshwater ecosystems as there are some, such as salt marshes, that have high salt concentrations—these support different species of animals, such as shrimp, shellfish, and various grasses

  22. Wetlands River Otter Damselfly Dragonfly Mayfly Crayfish Snails Leech Bluegill Bass Catfish Sculpin Minnow Snakes Frog Turtle Great Blue Heron Canadian Goose

  23. Marine Oceans Coral Reefs Estuaries Aquatic Ecosystems

  24. Marine • cover about three-fourths of the Earth’s surface and include oceans, coral reefs, and estuaries • algae supply much of the world’s oxygen supply and take in a huge amount of atmospheric carbon dioxide • evaporation of the seawater provides rainwater for the land

  25. Oceans • largest of all the ecosystems • dominate the Earth’s surface • separate zones • Intertidal • Pelagic • Abyssal • Benthic • great diversity of species • richest diversity of species even though it contains fewer species than there are on land

  26. Oceans

  27. Intertidal Zone • where the ocean meets the land • sometimes submerged and at other times exposed • waves and tides come in and out • communities are constantly changing

  28. Intertidal Zone • rocky coasts • stratified vertically • Where only highest tides reach • a few species of algae and mollusks • submerged during high tide • more diverse array of algae and small animals, such as herbivorous snails, crabs, sea stars, and small fishes • bottom of the intertidal zone • only exposed during the lowest tides, many invertebrates, fishes, and seaweed can be found

  29. Intertidal Zone • sandier shores • not as stratified • waves keep mud and sand constantly moving • very few algae and plants can establish themselves—the fauna include worms, clams, predatory crustaceans, crabs, and shorebirds.

  30. Wave Regions • much stronger than wind • decide what grows where • shores classified by amount of wave action • Exposed shores – receive full brunt of the ocean for most or at least some of the time • Semi-exposed shores – sheltered by barrier islands but still have to cope with waves • Sheltered shores – shelter of peninsulas and inshore islands • Enclosed shores • river mouths and estuaries • completely sheltered by either a protective rocks or a sand bar

  31. Pelagic – Open Ocean • waters further from the land, basically the open ocean • generally cold though it is hard to give a general temperature range since, just like ponds and lakes, there is thermal stratification with a constant mixing of warm and cold ocean currents

  32. Epipelagic – Open Ocean • extends down to around 200m • lowest depth that light can penetrate • flora in the epipelagic zone include surface seaweeds • fauna include many species of fish and some mammals, such as whales and dolphins • many feed on the abundant plankton

  33. Mesopelagic Zone • "twilight zone" of the ocean • photic zone above • darkness below • food becomes scarce – some animals • migrate up to the surface at night to feed • rely on food that falls down from above • eat each other • sometimes the only things to eat may be bigger than the hunter • developed long sharp teeth, • expandable jaws and stomachs

  34. ctenophore – related to jellyfish Big Scale - ambush predator cilia can be illuminated Firefly squid three kinds of photophores Hatchet Fish only a few inches long Viperfish specially adapted hinged skull Dragonfish - stomachs hold big meals Snipeel up to 1.2m Siphonophores are colonies of animals related to jellyfish best known is Portugese Man of War

  35. Bathypelagic Zone • extends down from 1000 to 4000m • only light is from bioluminescent organisms • only food is what trickles down from above, or from eating other animals • water pressure at this depth is considerable (~100 – 400 atmospheres) • most animals are either black or red in color • very little blue/green light penetrates this deep – red is not reflected and looks black

  36. Narcomedusa Vampire Squid Snake Dragon Angler Fish Amphi - crustacean Ctenophore – voracious predator Deepstaria very slow swimmers, no tentacles, close flexible bells (up to a meter across) around their prey Big Red grows to over a meter across

  37. Abyssopelagic Zone - the Abyss • 4000m to the sea floor • only zone deeper than this is the hadal zone • areas found in deep sea trenches and canyons • home to pretty inhospitable living conditions • near- freezing temperatures • crushing pressures

  38. Deep Water Squid Basketstar Sea Pig Sea Spider Shrimp Winged Sea Cucumber Medussa Deep Sea Smoker - 648°F Deep-sea AnemoneHydrothermal Vent

  39. Ballina Angelfish • Beaked Salmon • A deepsea anglerfish (no common name) • Duckbilled Eel • A fanfin anglerfish • Fangtooth • Gilbert's Halosaur • Gulper Eel • Hammerjaw • Largescale New Laternfish • Longray Spiderfish • Portuguese Dogfish • Sharpnose Sevengill Shark • Short-tail Torpedo Ray • Silver Lighthouse Fish • A snaggletooth (no common name) • Snubnosed Eel • Southern Spineback • Sparkling Slickhead • Spiky Oreo • Stoplight Loosejaw • Triplewart Seadevil • Viperfish •

  40. The Coral Reef Biome A Look at a Marine Biome Created by Terri Street

  41. What Is a Coral Reef? • A structure formed by coral polyps, tiny animals that live in colonies. • Coral polyps form a hard, stony, branching structure made of limestone. • New polyps attach to old coral and gradually build the reef.

  42. Types of Coral Reefs • Fringing reefs • Submerged platforms of living coral extending from the shore into the sea • Barrier reefs • Follow the shore but are separated from it by water • Great Barrier Reef is world’s largest

  43. Types of Coral Reefs • Atolls • Ring-shaped islands of coral in open sea • Form on submerged mud banks or volcano craters • Surround a seawater lagoon • Channels connect lagoon to the sea