Stream capture

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Stream capture by headward erosion, leaving a wind gap Stream capture.png
Stream capture by headward erosion, leaving a wind gap

Stream capture, river capture, river piracy or stream piracy is a geomorphological phenomenon occurring when a stream or river drainage system or watershed is diverted from its own bed, and flows instead down the bed of a neighbouring stream. This can happen for several reasons, including:

Contents

The Maumee River basin. The Maumee, flowing north-east, has broken into part of the Wabash River basin, capturing west-flowing streams and reversing their flow direction on entering it. Maumeerivermap.png
The Maumee River basin. The Maumee, flowing north-east, has broken into part of the Wabash River basin, capturing west-flowing streams and reversing their flow direction on entering it.

The additional water flowing down the capturing stream may accelerate erosion and encourage the development of a canyon (gorge).

The now-dry valley of the original stream is known as a wind gap.

Capture mechanisms

Sea level rise

Tectonic uplift

Glacial damming

The River Thames as it passes through the Goring Gap GoringGap01.JPG
The River Thames as it passes through the Goring Gap

Headward erosion

Karst

Glacier retreat

The Slims River was previously fed by meltwater from the Kaskawulsh Glacier in the St. Elias Mountains in the Yukon and its waters flowed into Kluane Lake and on to the Bering Sea. Because of climate change, the glacier has rapidly receded and the meltwater no longer feeds the Slims. The water instead now feeds the Kaskawulsh River which is a tributary to the Alsek River and drains into the Gulf of Alaska. [7] [8]

Effect on freshwater life

River capture is a shaping force in the biogeography or distribution of many freshwater fish species. [9] [10]

New Zealand freshwater fish

Geological uplift in the southern South Island led to the divergence of freshwater galaxiid populations isolated by river capture. [11] [12] [13]

Australian freshwater fish

The formerly massive Great Dividing Range runs the length of the eastern coastline of Australia and has isolated native freshwater fish populations east and west of the range for millions of years. In the last two million years erosion has reduced the Great Dividing Range to a critical point where west-to-east river capture events have been possible. A number of native fish species that originated in the Murray–Darling river system to the west are (or were) found naturally occurring in a number of coastal systems spanning almost the entire length of the range.

None of the river capture events that allowed native fish of the Murray-Darling system to cross into and colonise these East Coast river systems seem to have formed permanent linkages. The colonising Murray-Darling fish in these East Coast river systems have therefore become isolated from their parent species, and due to isolation, the founder effect, genetic drift and natural selection, have become separate species (see allopatric speciation).

Examples include:

Olive perchlet (Ambassis agassizii), western carp gudgeon (Hypseleotris klungzingeri), pygmy perch (Nannoperca australis) and Australian smelt (Retropinna semoni) also appear to have made crossings into coastal systems, the last two species seemingly many times as they are found in most or all coastal streams in south eastern Australia as well as the Murray-Darling system.

Unfortunately, with the exception of eastern freshwater cod and Mary River cod, it has not been widely recognised that these coastal populations of Murray–Darling native fish are separate species and their classifications have not been updated to reflect this. Many are threatened and two, the Richmond River cod and the Brisbane River cod, have become extinct.

See also

Related Research Articles

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<span class="mw-page-title-main">Eastern freshwater cod</span> Species of fish

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<span class="mw-page-title-main">Trout cod</span> Species of fish

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Barmah is a town in the state of Victoria, Australia.

<span class="mw-page-title-main">Macquarie perch</span> Species of fish

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<i>Bidyanus bidyanus</i> Species of fish

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<span class="mw-page-title-main">Australian smelt</span> Species of fish

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<span class="mw-page-title-main">River</span> Natural flowing watercourse

A river is a natural flowing watercourse, usually a freshwater stream, flowing on the surface or inside caves towards another waterbody at a lower elevation, such as an ocean, sea, bay, lake, wetland, or another river. In some cases, a river flows into the ground or becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to by names such as creek, brook, and rivulet. There are no official definitions for the generic term river as applied to geographic features, although in some countries or communities, a stream is defined by its size. Many names for small rivers are specific to geographic location; examples are "run" in some parts of the United States, "burn" in Scotland and Northeast England, and "beck" in Northern England. Sometimes a river is defined as being larger than a creek, but not always; the language is vague.

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<span class="mw-page-title-main">Cadell Fault</span>

The Cadell Fault is a north-south trending intra-plate geological fault in the Riverina area of New South Wales and Victoria, in Australia. It straddles the Murray River and, in quite recent geological times, has affected its course, as well as the courses of the Edward River, Wakool River, Goulburn River and Campaspe River. The Cadell Fault is notable due to that impact and has been described as one of the most significant examples of seismic activity changing the course of rivers. The fault is visible as a continuous earthen ridge along the Cobb Highway between Deniliquin and Echuca, and extends further south into Victoria. The fault is likely named after Francis Cadell, an early European pioneer of the Murray River and river trader.

References

  1. Department of Geology. "River Capture". www.otago.ac.nz. University of Otago. Retrieved 1 April 2023.
  2. K.N. Dikshit, 2013, Origin of Early Harappan Cultures in the Sarasvati. Valley: Recent Archaeological Evidence and Radiometric Dates, Journal of Indian Ocean Archaeology, pp88-
  3. Williams, G.E. and Goode, A.D.T. (1978). Possible western outlet for an ancient Murray River in South Australia. Search 9: 442-447.
  4. McLaren, S., Wallace, M.W. and Reynolds, T. (2012). The Late Pleistocene evolution of palaeo megalake Bungunnia, southeastern Australia: A sedimentary record of fluctuating lake dynamics, climate change and the formation of the modern Murray River. Palaeogeography, Palaeoclimatology, Palaeoecology 317-318: 114-127.
  5. Tom L. McKnight; Darrel Hess (2005). "16, "The Fluvial Processes"". Physical Geography: A Landscape Appreciation (8th ed.). Upper Saddle River, New Jersey: Pearson, Prentice Hall. p. 462. ISBN   0-13-145139-1.
  6. Stokes, Maya; Goldberg, Samuel; Perron, J. Taylor (2018). "Ongoing River Capture in the Amazon". Geophysical Research Letters. 45 (11): 5545–5552. Bibcode:2018GeoRL..45.5545S. doi: 10.1029/2018GL078129 .
  7. Retreating Yukon glacier makes river disappear, CBC News Posted: Jun 17, 2016
  8. Shugar, Dan, H.; et al. (2017). "River piracy and drainage basin reorganization led by climate-driven glacier retreat". Nature Geoscience. 10 (5): 370–375. Bibcode:2017NatGe..10..370S. doi:10.1038/ngeo2932.
  9. Albert, J. S., & Crampton, W. G. (2010). The geography and ecology of diversification in Neotropical freshwaters. Nature Education Knowledge, 1, 13–19
  10. Albert, J. S., Schoolmaster, D. R., Tagliacollo, V., & Duke-Sylvester, S. M. (2016). Barrier displacement on a neutral landscape: Towards a theory of continental biogeography. Systematic Biology, syw080
  11. Waters, Jonathan M.; Craw, Dave; Youngson, John H.; Wallis, Graham P. (September 2001). "GENES MEET GEOLOGY: FISH PHYLOGEOGRAPHIC PATTERN REFLECTS ANCIENT, RATHER THAN MODERN, DRAINAGE CONNECTIONS". Evolution. 55 (9): 1844–1851. doi: 10.1111/j.0014-3820.2001.tb00833.x .
  12. Craw, Dave; Campbell, Ciaran; Waters, Jonathan M. (8 September 2022). "Miocene-Holocene river drainage evolution in Southland, New Zealand, deduced from fish genetics, detrital gold and geology". New Zealand Journal of Geology and Geophysics: 1–14. doi:10.1080/00288306.2022.2121289.
  13. Campbell, Ciaran S. M.; Dutoit, Ludovic; King, Tania M.; Craw, Dave; Burridge, Christopher P.; Wallis, Graham P.; Waters, Jonathan M. (October 2022). "Genome‐wide analysis resolves the radiation of New Zealand's freshwater Galaxias vulgaris complex and reveals a candidate species obscured by mitochondrial capture". Diversity and Distributions. 28 (10): 2255–2267. doi:10.1111/ddi.13629.