Aquatic Ecology Course Zoo 374 Again Marine Life Forms Marine Bacteria Nekton fish & mammals Plankton Phytoplankton Zooplankton PhytoBenthos& Macro-algae Benthos Zoo-benthos Invertebrate animals Benthos & Nekton • Benthos Benthic Flora Seagrass Red Algae Benthic Fauna Megafauna Green Algae Brown Algae Macrofauna Kelp Bed Microfauna Meiofauna Kelp bed Prof.Dr.Hanan M Mitwally, Marine Biology Marsh grass Aquatic Vegetations Seagrass Bed Montaza Bay, Alexandria, By Prof., Hesham Mostafa Kelp bed Prof.Dr.Hanan M Mitwally, Marine Biology Again Marine Life Forms Marine Bacteria Nekton fish & mammals Plankton Phytoplankton Zooplankton PhytoBenthos& Macro-algae Benthos Zoo-benthos Invertebrate animals Nekton in Open Ocean Nekton Ecosystems Nekton are pelagic animals that swim freely, independent of water motion or wind, (the active swimmers of the oceans) and are often the best-known organisms of marine waters. Nekton (Cont.) - Plankton and herbiverous nekton live in photic zone, some graze on plant material throughout the water column. - Carnivorous nekton live mostly below the photic zone, move vertically in search of food. - Omnivorous nekton are most common at bathyl depths. - Detritus feeders tend to occur at depths greater than carnivores. Nekton (Cont.) Most nekton are chordates, animals with bones or cartilage. This category of nekton includes: * Bony fish (most common) * Cartilaginous fish (sharks and rays) * Mammals (whales, seals, porpoises and dolphins) * Reptiles (Turtles, snakes, iguana and saltwater crocodiles) * Sea birds (Penguins)
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