allochthonous - significado y definición. Qué es allochthonous
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Qué (quién) es allochthonous - definición

TYPE OF AQUATIC ECOSYSTEM WITH FLOWING FRESHWATER
Stream ecology; River ecology; Lotic; Lotic ecology; Allochthonous; Lotic System Ecology; Lotic system ecology; River ecosystems; Streamland ecology; Lotic ecosystems; Lotic systems; Lotic ecosystem; Stream ecosystem; Invasive species in river ecosystems; Riverine ecosystem; Riverine Ecosystem
  • 50px]] Material was copied from this source, which is available under a [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License].</ref>
  • Different biofilm components in streams.<ref name=Sabater2016 /> Principal components are algae and bacteria.
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  • [[Castle Geyser]], [[Yellowstone National Park]]
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  • A pensive Cooplacurripa River, [[NSW]]
  • Pondweed]] is an autochthonous energy source.
  • Cascade in the [[Pyrénées]]
  • 50px]] Material was copied from this source, which is available under a [https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International License].</ref> Examples are mainly from settings with a modest technological influence, especially in the period of about 10,000 to 4000 cal yr BP.
  • [[New Zealand longfin eel]]s can weigh over 50 kilograms.
  • Rapids in [[Mount Robson Provincial Park]]
  • Periphyton
  • River Calder]], [[West Yorkshire]]
  • The [[brook trout]] is native to small streams, creeks, lakes, and spring ponds.
  • Leaf litter is an allochthonous energy source.
  • This stream operating together with its environment can be thought of as forming a river ecosystem.
  • Flowing rivers can act as [[dispersal vector]]s for plant matter and invertebrates.
  • A forest stream in the winter near [[Erzhausen]], Germany

allochthonous         
[?'l?k??n?s]
¦ adjective Geology denoting a deposit or formation that originated at a distance from its present position. Often contrasted with autochthonous.
Origin
early 20th cent.: from allo- + Gk khthon 'earth' + -ous.
River ecosystem         
River ecosystems are flowing waters that drain the landscape, and include the biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions of its many parts.Angelier, E.

Wikipedia

River ecosystem

River ecosystems are flowing waters that drain the landscape, and include the biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions of its many parts. River ecosystems are part of larger watershed networks or catchments, where smaller headwater streams drain into mid-size streams, which progressively drain into larger river networks. The major zones in river ecosystems are determined by the river bed's gradient or by the velocity of the current. Faster moving turbulent water typically contains greater concentrations of dissolved oxygen, which supports greater biodiversity than the slow-moving water of pools. These distinctions form the basis for the division of rivers into upland and lowland rivers.

The food base of streams within riparian forests is mostly derived from the trees, but wider streams and those that lack a canopy derive the majority of their food base from algae. Anadromous fish are also an important source of nutrients. Environmental threats to rivers include loss of water, dams, chemical pollution and introduced species. A dam produces negative effects that continue down the watershed. The most important negative effects are the reduction of spring flooding, which damages wetlands, and the retention of sediment, which leads to the loss of deltaic wetlands.

River ecosystems are prime examples of lotic ecosystems. Lotic refers to flowing water, from the Latin lotus, meaning washed. Lotic waters range from springs only a few centimeters wide to major rivers kilometers in width. Much of this article applies to lotic ecosystems in general, including related lotic systems such as streams and springs. Lotic ecosystems can be contrasted with lentic ecosystems, which involve relatively still terrestrial waters such as lakes, ponds, and wetlands. Together, these two ecosystems form the more general study area of freshwater or aquatic ecology.

The following unifying characteristics make the ecology of running waters unique among aquatic habitats: the flow is unidirectional, there is a state of continuous physical change, and there is a high degree of spatial and temporal heterogeneity at all scales (microhabitats), the variability between lotic systems is quite high and the biota is specialized to live with flow conditions.