Portal:Rivers

Image 1New Zealand longfin eels can weigh over 50 kilograms. (from River ecosystem)

Image 2Leaf litter is an allochthonous energy source. (from River ecosystem)

Image 3Different biofilm components in streams. Principal components are algae and bacteria. (from River ecosystem)

Image 4A pensive Cooplacurripa River, )

Image 5In )

Image 6The cave of )

Image 7Castle Geyser, Yellowstone National Park (from River ecosystem)

Image 8A forest stream in the winter near Erzhausen, Germany (from River ecosystem)

Image 9Pondweed is an autochthonous energy source. (from River ecosystem)

Image 10Common water hyacinth in flower (from River ecosystem)

Image 11Periphyton (from River ecosystem)

Image 12The brook trout is native to small streams, creeks, lakes, and spring ponds. (from River ecosystem)

Image 13A subterranean river in the Cross Cave system of Slovenia. (Scale shown by people in photograph.) (from Subterranean river)

Image 14Flowing rivers can act as dispersal vectors for plant matter and invertebrates. (from River ecosystem)

Image 15Cascade in the )

Image 16Example of a river food web. Bacteria can be seen in the red box at the bottom. Bacteria (and other decomposers, like worms) decompose and recycle nutrients back to the habitat, which is shown by the light blue arrows. Without bacteria, the rest of the food web would starve, because there would not be enough nutrients for the animals higher up in the food web. The dark orange arrows show how some animals consume others in the food web. For example, lobsters may be eaten by humans. The dark blue arrows represent one complete food chain, beginning with the consumption of algae by the water flea, Daphnia, which is consumed by a small fish, which is consumed by a larger fish, which is at the end consumed by the great blue heron. (from River ecosystem)

Image 17Co-occurrence network of a bacterial community in a stream (from River ecosystem)

Image 18This stream operating together with its environment can be thought of as forming a river ecosystem. (from River ecosystem)

Image 19Rapids in Mount Robson Provincial Park (from River ecosystem)

Image 20Whitewater at Yosemite (from Whitewater)

Image 22The Puerto Princesa cave can be entered by boat. (from Subterranean river)

Image 23Devil's Throat Cave subterranean river from above (from Subterranean river)

Image 24The Effra is one of the subterranean rivers of London. It empties into the Thames by Vauxhall Bridge, from which this photograph was taken. (from Subterranean river)

Image 25A weir on the River Calder, West Yorkshire (from River ecosystem)

Image 26Anthropogenic influences on river systems. Examples are mainly from settings with a modest technological influence, especially in the period of about 10,000 to 4000 cal yr BP. (from River ecosystem)