Anonymous asked in Science & MathematicsBiology · 1 decade ago

How do these aquatic ecosystems work? (details inside)?

Stream, river, water, and pond. It's for a powerpoint presentation, and I need to do an overview on how all four work. This is for a Biology course in High School, so it doesn't have to be overly complicated. If you don't want to explain it, you can give me a link to a site that does. I spent a fair amount of time looking for diagrams and such, but I haven't found anything...

Thanks in advance.

1 Answer

  • 1 decade ago
    Favorite Answer

    Fresh bodies of water come in classes.

    Lacustrine inland lakes that are formed in local depressions. They are long term with no trees and shrubs suviving periodic submergence. They have less than 30% vegetation cover, and have an outlet so water flows through the system. They are large enough to not be seasonal, at least 20 acres.

    Palustrine are nontidal, so they are freshwater inland marshes, swamps, river flood lands or bog lands with permanent or seasonal water. They are typified by the emergent plants emerge that grow such as reeds, papyrus, and rice. However even temporary playas, mudflats and salt pans that may be devoid of both water & vegetation much of the time are considered palustrine. A floodplain that retained areas of still water can be classed this way but so can lake or pond shores. Palustrine includes shallow ponds, ephemeral ponds, peatland, ground water spring oases, and bogs.

    Prairie grasslands have wet localities with palustrine potholes or marshes. They form in old glacier basins scoured out in the ice ages. Glaciers leave dams of soil then retreat. Water carries soil & silt in to fill in the dammed basin. Most marshes are about 1 acre or less in area in the South Dakota, Minnesota, Saskatchewan and Alberta Prairies. In all there is some 780,000 sq K of interspersed marshes and prairie that support this ecosystem.

    Migratory birds rely on the presence of these water sources along their routes and as breeding grounds. It is thought some 75% of waterfowl rely on prairie wetlands: mallard, canvasback, lesser scaup, pintail, grebe, rail, killdeer, godwit, black tern, marsh wren, various types of blackbird and savannah sparrow can be found. Beaver, mice, shrews, mink, weasels, foxes, coyotes, and deer will live there or use then as water sources.

    Cattails, bulrush, sedges, and arrowhead are emergent water plants that grow rooted in the water logged soil. Floating and submerged plants include water lilies, watermeal and wild rice.

    Plant communities

    Wet meadows, marshes & fens

    Restoring prairie wetlands-

    Other areas rich in grassland and marshes includes Florida. These have a very different water system than prairie grasslands. Prairies receive limited, seasonal precipitation. Tallgrass prairie receives slightly more than 20” rain/year while shortgrass receives less but the everglades receives about 60"/year.

    Florida grasslands have a larger number of invertebrate primary consumers of the dense plant life that the American prairie or African savannah. Florida grasslands can support more small carnivores that live on insects and other invertebrates as a result. The largest carnivore in the Florida grassland ecosystem is the native panther (Felis concolor coryi). The majority of heterotrophs are small amphibians, owls and other birds of prey, snakes, rodents, bobcats, foxes and raccoons as well as an array of invertebrates including beetles, ants, spiders, and tree snails as part of the ecology.

    Florida’s Felis concolor

    Grassland systems

    Floridian fossil evidence for climate

    ‘Wetlands’ by Dennison

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