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Salmon run

salmon run mall movies, salmon run
The salmon run is the time when salmon, which have migrated from the ocean, swim to the upper reaches of rivers where they spawn on gravel beds After spawning, all Pacific salmon and most Atlantic salmon die, and the salmon life cycle starts over again The annual run can be a major event for grizzly bears, bald eagles and sport fishermen Most salmon species migrate during the fall September through November

Salmon spend their early life in rivers, and then swim out to sea where they live their adult lives and gain most of their body mass When they have matured, they return to the rivers to spawn Usually they return with uncanny precision to the natal river where they were born, and even to the very spawning ground of their birth It is thought that, when they are in the ocean, they use magnetoception to locate the general position of their natal river, and once close to the river, that they use their sense of smell to home in on the river entrance and even their natal spawning ground

In northwest America, salmon is a keystone species, which means the impact they have on other life is greater than would be expected in relation to their biomass The death of the salmon has important consequences, since it means significant nutrients in their carcasses, rich in nitrogen, sulfur, carbon and phosphorus, are transferred from the ocean to terrestrial wildlife such as bears and riparian woodlands adjacent to the rivers This has knock-on effects not only for the next generation of salmon, but to every species living in the riparian zones the salmon reach The nutrients can also be washed downstream into estuaries where they accumulate and provide further support for estuarine breeding birds

Contents

  • 1 Background
  • 2 Return from the ocean
  • 3 Obstacles to the run
  • 4 The spawning
  • 5 Keystone species
  • 6 Prospects
  • 7 Notable runs
  • 8 See also
  • 9 References
  • 10 Cited sources
  • 11 Further reading
  • 12 External links

Background

Adult ocean phase and spawning phase pink salmon male Sac fry remain in the gravel habitat of their redd nest until their yolk sac, or "lunch box" is depleted After depleting their yolk sac nutrients, the young salmon emerge from the gravel habitat as parr to feed

Most salmon are anadromous, a term which comes from the Greek anadromos, meaning "running upward" Anadromous fish grow up mostly in the saltwater in oceans When they have matured they migrate or "run up" freshwater rivers to spawn in what is called the salmon run

Anadromous salmon are Northern Hemisphere fish that spend their ocean phase in either the Atlantic Ocean or the Pacific Ocean They do not thrive in warm water There is only one species of salmon found in the Atlantic, commonly called the Atlantic salmon These salmon run up rivers on both sides of the ocean Seven different species of salmon inhabit the Pacific see table, and these are collectively referred to as Pacific salmon Five of these species run up rivers on both sides of the Pacific, but two species are found only on the Asian side In the early 19th century, Chinook salmon were successfully established in the Southern Hemisphere, far from their native range, in New Zealand rivers Attempts to establish anadromous salmon elsewhere have not succeeded

Species of anadromous salmon
Oceans Coasts Species Maximum Comment
length weight life span
North Atlantic Both sides Atlantic salmon 150 cm 468 kg 13 years
North Pacific Both sides Chinook salmon 150 cm 614 kg 9 years Also established in New Zealand
Chum salmon 100 cm 159 kg 7 years
Coho salmon 108 cm 152 kg 5 years
Pink salmon 76 cm 68 kg 3 years
Sockeye salmon 84 cm 77 kg 8 years
Asian side Masu salmon 79 cm 100 kg
Biwa salmon 44 cm 13 kg

The life cycle of an anadromous salmon begins and, if it survives the full course of its natural life, usually ends in a gravel bed in the upper reaches of a stream or river These are the salmon spawning grounds where salmon eggs are deposited, for safety, in the gravel The salmon spawning grounds are also the salmon nurseries, providing a more protected environment than the ocean usually offers After 2 to 6 months the eggs hatch into tiny larvae called sac fry or alevin The alevin have a sac containing the remainder of the yolk, and they stay hidden in the gravel while they feed on the yolk When the yolk has gone they must find food for themselves, so they leave the protection of the gravel and start feeding on plankton At this point the baby salmon are called fry At the end of the summer the fry develop into juvenile fish called parr Parr feed on small invertebrates and are camouflaged with a pattern of spots and vertical bars They remain in this stage for up to three years

As they approach the time when they are ready to migrate out to the sea the parr lose their camouflage bars and undergo a process of physiological changes which allows them to survive the shift from freshwater to saltwater At this point salmon are called smolt Smolt spend time in the brackish waters of the river estuary while their body chemistry adjusts their osmoregulation to cope with the higher salt levels they will encounter in the ocean Smolt also grow the silvery scales which visually confuse ocean predators When they have matured sufficiently in late spring, and are about 15 to 20 centimetres long, the smolt swim out of the rivers and into the sea There they spend their first year as a post-smolt Post-smolt form schools with other post-smolt, and set off to find deep-sea feeding grounds They then spend up to four more years as adult ocean salmon while their full swimming and reproductive capacity develops

Then, in one of the animal kingdom's more extreme migrations, the salmon return from the saltwater ocean back to a freshwater river to spawn afresh

Return from the ocean

Salmon jumping a fall

After several years wandering huge distances in the ocean, most surviving salmon return to the same natal rivers where they were spawned Then most of them swim up the rivers until they reach the very spawning ground that was their original birthplace

There are various theories about how this happens One theory is that there are geomagnetic and chemical cues which the salmon use to guide them back to their birthplace The fish may be sensitive to the Earth's magnetic field, which could allow the fish to orient itself in the ocean, so it can navigate back to the estuary of its natal stream

Salmon have a strong sense of smell Speculation about whether odours provide homing cues go back to the 19th century In 1951, Hasler hypothesised that, once in vicinity of the estuary or entrance to its birth river, salmon may use chemical cues which they can smell, and which are unique to their natal stream, as a mechanism to home onto the entrance of the stream In 1978, Hasler and his students convincingly showed that the way salmon locate their home rivers with such precision was indeed because they could recognise its characteristic smell They further demonstrated that the smell of their river becomes imprinted in salmon when they transform into smolts, just before they migrate out to sea Homecoming salmon can also recognise characteristic smells in tributary streams as they move up the main river They may also be sensitive to characteristic pheromones given off by juvenile conspecifics There is evidence that they can "discriminate between two populations of their own species"

The recognition that each river and tributary has its own characteristic smell, and the role this plays as a navigation aid, led to a widespread search for a mechanism or mechanisms that might allow salmon to navigate over long distances in the open ocean In 1977, Leggett identified, as mechanisms worth investigating, the use of the sun for navigation, and orientation to various possible gradients, such as temperature, salinity or chemicals gradients, or geomagnetic or geoelectric fields

There is little evidence salmon use clues from the sun for navigation Migrating salmon have been observed maintaining direction at nighttime and when it is cloudy Likewise, electronically tagged salmon were observed to maintain direction even when swimming in water much too deep for sunlight to be of use

In 1973, it was shown that Atlantic salmon have conditioned cardiac responses to electric fields with strengths similar to those found in oceans "This sensitivity might allow a migrating fish to align itself upstream or downstream in an ocean current in the absence of fixed references" In 1988, researchers found iron, in the form of single domain magnetite, resides in the skulls of sockeye salmon The quantities present are sufficient for magnetoception

Tagging studies have shown a small number of fish don't find their natal rivers, but travel instead up other, usually nearby streams or rivers It is important some salmon stray from their home areas; otherwise new habitats could not be colonized In 1984, Quinn hypothesized there is a dynamic equilibrium, controlled by genes, between homing and straying If the spawning grounds have a uniform high quality, then natural selection should favour the descendants that home accurately However, if the spawning grounds have a variable quality, then natural selection should favour a mixture of the descendants that stray and the descendants that home accurately

The kype of a spawning male salmon

Prior to the run up the river, the salmon undergo profound physiological changes Fish swim by contracting longitudinal red muscle and obliquely oriented white muscles Red muscles are used for sustained activity, such as ocean migrations White muscles are used for bursts of activity, such as bursts of speed or jumping As the salmon comes to end of its ocean migration and enters the estuary of its natal river, its energy metabolism is faced with two major challenges: it must supply energy suitable for swimming the river rapids, and it must supply the sperm and eggs required for the reproductive events ahead The water in the estuary receives the freshwater discharge from the natal river Relative to ocean water, this has a high chemical load from surface runoff Researchers in 2009 found evidence that, as the salmon encounter the resulting drop in salinity and increase in olfactory stimulation, two key metabolic changes are triggered: there is a switch from using red muscles for swimming to using white muscles, and there is an increase in the sperm and egg load "Pheromones at the spawning grounds a second shift to further enhance reproductive loading"

The salmon also undergo radical morphological changes as they prepare for the spawning event ahead All salmon lose the silvery blue they had as ocean fish, and their colour darkens, sometimes with a radical change in hue Salmon are sexually dimorphic, and the male salmon develop canine-like teeth and their jaws develop a pronounced curve or hook kype Some species of male salmon grow large humps

Obstacles to the run

A fish ladder makes it easier for salmon to negotiate a weir An extended bypass

Salmon start the run in peak condition, the culmination of years of development in the ocean They need high swimming and leaping abilities to battle the rapids and other obstacles the river may present, and they need a full sexual development to ensure a successful spawn at the end of the run All their energy goes into the physical rigours of the journey and the dramatic morphological transformations they must still complete before they are ready for the spawning events ahead

The run up the river can be exhausting, sometimes requiring the salmon to battle hundreds of miles upstream against strong currents and rapids They cease feeding during the run Chinook and sockeye salmon from central Idaho must travel 900 miles 1,400 km and climb nearly 7,000 feet 2,100 m before they are ready to spawn Salmon deaths that occur on the upriver journey are referred to as en route mortality

Salmon negotiate waterfalls and rapids by leaping or jumping They have been recorded making vertical jumps as high as 365 metres 12 ft The height that can be achieved by a salmon depends on the position of the standing wave or hydraulic jump at the base of the fall, as well as how deep the water is

Fish ladders, or fishways, are specially designed to help salmon and other fish to bypass dams and other man made obstructions, and continue on to their spawning grounds further upriver

The black fur of black bears is easily spotted by salmon in daylight, and the bears fish more successfully using auditory clues at night White-coated spirit bears have more success fishing in daylight

Skilled predators, such as bears, bald eagles and fishermen can await the salmon during the run Normally solitary animals, grizzly bears congregate by streams and rivers when the salmon spawn Predation from Harbor seals, California sea lions, and Steller sea lions, can pose a significant threat, even in river ecosystems

Black bears also fish the salmon Black bears usually operate during the day, but when it comes to salmon they tend to fish at night This is partly to avoid competition with the more powerful brown bears, but it is also because they catch more salmon at night During the day, salmon are very evasive and attuned to visual clues, but at night they focus on their spawning activities, generating acoustic clues the bears tune into Black bears may also fish for salmon during the night because their black fur is easily spotted by salmon in the daytime In 2009, researchers compared the foraging success of black bears with the white-coated spirit bear, a morphed subspecies of the black bear They found the spirit bear had no more success catching salmon at night time, but had greater success than the black bears during the day

Otters are also common predators In 2011, researchers showed that when otters predate salmon, the salmon can "sniff them out" They demonstrated that once otters have eaten salmon, the remaining salmon could detect and avoid the waters where otter faeces was present

The spawning

See also: Juvenile salmon Salmon redds Spawning salmon building redds on a riffle The white areas on the river bottom are completed redds

The term prespawn mortality is used to refer to fish that arrive successfully at the spawning grounds, and then die without spawning Prespawn mortality is surprisingly variable, with one study observing rates between 3% and 90% Factors that contribute to these mortalities include high temperatures, high river discharge rates, and parasites and diseases However, "at present there are no reliable indicators to predict whether an individual arriving at a spawning area will in fact survive to spawn"

The eggs of a female salmon are called her roe To lay her roe, the female salmon builds a spawning nest, called a redd, in a riffle with gravel as its streambed A riffle is a relatively shallow length of stream where the water is turbulent and flows faster She builds the redd by using her tail caudal fin to create a low-pressure zone, lifting gravel to be swept downstream, and excavating a shallow depression The redd may contain up to 5,000 eggs, each about the size of a pea, covering 30 square feet 28 m2 The eggs usually range from orange to red One or more males will approach the female in her redd, depositing his sperm, or milt, over her eggs The female then covers the eggs by disturbing the gravel at the upstream edge of the depression before moving on to make another redd The female will make as many as seven redds before her supply of eggs is exhausted

Male pink salmon and some sockeye salmon develop pronounced humps just before they spawn These humps may have evolved because they confer species advantages The humps make it less likely the salmon will spawn in the shallow water at margins of the streambed, which tend to dry out during low water flows or freeze in winter Further, riffles can contain many salmon spawning simultaneously, as in the image on the right Predators, such as bears, will be more likely to catch the more visually prominent humped males, with their humps projecting above the surface of the water This may provide a protective buffer for the females

Dominant male salmon defend their redds by rushing at and chasing intruders They butt and bite them with the canine-like teeth they developed for the spawning event The kypes are used to clamp around the base of the tail caudal peduncle of an opponent

The condition of the salmon deteriorates the longer they remain in fresh water Once the salmon have spawned, most of them deteriorate rapidly and die This programmed senescence is "characterized by immunosuppression and organ deterioration" The Pacific salmon is the classic example of a semelparous animal It lives for many years in the ocean before swimming to the freshwater stream of its birth, spawning, and then dying Semelparous animals spawn once only in their lifetime Semelparity is sometimes called "big bang" reproduction, since the single reproductive event of semelparous organisms is usually large and fatal to the spawners Most Atlantic salmon also die after spawning, but not all About 5 to 10%, mostly female, return to the ocean where they can recover and spawn again

Spawning male sockeye salmon The pea-sized eggs are laid in redds All Pacific salmon pictured and most Atlantic salmon die after spawning

Keystone species

Grizzly bears tend to carry salmon carcass into adjacent riparian areas Salmon subsidy to the nitrogen cycle in a hypothetical stream system

In the Pacific Northwest and Alaska, salmon is a keystone species, supporting wildlife from birds to bears and otters The bodies of salmon represent a transfer of nutrients from the ocean, rich in nitrogen, sulfur, carbon and phosphorus, to the forest ecosystem

Grizzly bears function as ecosystem engineers, capturing salmon and carrying them into adjacent wooded areas There they deposit nutrient-rich urine and faeces and partially eaten carcasses It has been estimated that bears leave up to half the salmon they harvest on the forest floor, in densities that can reach 4,000 kilograms per hectare, providing as much as 24% of the total nitrogen available to the riparian woodlands The foliage of spruce trees up to 500 m 1,600 ft from a stream where grizzlies fish salmon have been found to contain nitrogen originating from fished salmon

Salmon continue to surprise us, showing us new ways in which their oceanic migrations eventually permeate entire terrestrial ecosystems In terms of providing food and nutrients to a whole food web, we like to think of them as North America's answer to the Serengeti's wildebeest

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Wolves normally hunt for deer However, a 2008 study shows that, when the salmon run starts, the wolves choose to fish for salmon, even if plenty of deer are still available "Selecting benign prey such as salmon makes sense from a safety point of view While hunting deer, wolves commonly incur serious and often fatal injuries In addition to safety benefits we determined that salmon also provides enhanced nutrition in terms of fat and energy"

The upper reaches of the Chilkat River in Alaska has particularly good spawning grounds Each year these attract a run of up to half a million chum salmon As the salmon run up the river, bald eagles arrive in their thousands to feast at the spawning grounds This results in some of the world's largest congregations of bald eagles The number of participating eagles is directly correlated with the number of spawning salmon

Residual nutrients from salmon can also accumulate downstream in estuaries A 2010 study showed the density and diversity of many estuarine breeding birds in the summer "were strongly predicted by salmon biomass in the autumn" Anadromous salmon provide nutrients to these "diverse assemblages ecologically comparable to the migrating herds of wildebeest in the Serengeti

Prospects

In 2009, NOAA advised that continued runoff into North American rivers of three widely used pesticides containing neurotoxins, will "jeopardize the continued existence" of endangered and threatened Pacific salmon Global warming could see the end of some salmon runs by the end of the century, such as the Californian runs of Chinook salmon A 2010 United Nations report says increases in acidification of oceans means shellfish such as pteropods, an important component of the ocean salmon diet, are finding it difficult to build their aragonite shells There are concerns that this too may endanger future salmon runs

Notable runs

External video
Bears Catching Salmon Video on YouTube – Nature's Great Events: The Great Salmon Run
Eagle catches salmon Video on YouTube – BBC Nature's Great Events - The Great Salmon Run
The Great Salmon Run Video on YouTube – BBC Nature's Great Events
Nimbus Hatchery Fish Ladder on YouTube
Cycle of Salmon Video on YouTube
Cycle of Salmon Video on YouTube – Discovery Channel
The Salmon's Lifecycle Atlantic Salmon Trust
Sockeye Salmon Run 2010 on YouTube
Spawning salmon constructing a redd on YouTube
Raising salmon on YouTube
life cycle song Video on YouTube
  • Adams River British Columbia
  • Chilkat River Alaska
  • Columbia River British Columbia, United States
  • Copper River Alaska
  • Fraser River British Columbia
  • River Spey Scotland
  • River Tay Scotland
  • River Tweed border of Scotland and England
  • River Tyne England
  • Snake River United States
  • Yukon River Alaska, Yukon, British Columbia

See also

  • Animal navigation
  • Environmental impact of reservoirs
  • June hogs
  • Natal homing
  • Olfactory navigation
  • Pre-spawn mortality in coho salmon
  • Sardine run

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  69. ^ Environment News Service 21 April 2009 Three Common Pesticides Toxic to Salmon
  70. ^ Thompson LC, Escobar MI, Mosser CM, Purkey DR, Yates D and Moyle PB 2012 "Water Management Adaptations to Prevent Loss of Spring-Run Chinook Salmon in California under Climate Change" Journal of Water Resources Planning and Management 138 5: 465 doi:101061/ASCEWR1943-54520000194  CS1 maint: Multiple names: authors list link
  71. ^ ScienceDaily 1 September 2011 Warming Streams Could Be the End for Spring-Run Chinook Salmon in California
  72. ^ UNEP 2010 Environmental Consequences of Ocean Acidification: A Threat to Food Security
  73. ^ The Telegraph 3 December 2010 Cancun climate summit: Britain's salmon at risk from ocean acidification

Cited sources

  • Moyle PB and Cech JJ 2004 Fishes, An Introduction to Ichthyology 5th ed Benjamin Cummings ISBN 978-0-13-100847-2 

Further reading

  • Froese, Rainer and Pauly, Daniel, eds 2011 "Oncorhynchus mykiss" in FishBase December 2011 version
  • USDA Forest Service, Salmon/Steelhead Pacific Northwest Fisheries Program Retrieved 30 December 2011
  • Knapp G, Roheim CA and Anderson JL 2007 The Great Salmon Run: Competition Between Wild and Farmed Salmon World Wildlife Fund
  • Lackey, Robert Salmon 2100 Project Oregon State University
  • Mozaffari, Ahmad and Alireza Fathi 2013 "A natural-inspired optimization machine based on the annual migration of salmons in nature" arXiv preprint: 13124078 PDF
  • Quinn, Thomas P 2005 The Behavior and Ecology of Pacific Salmon and Trout UBC Press ISBN 978-0-7748-1128-6
Magnetoception and natal homing
  • Bandoh H, Kida I, Ueda H 2011 "Olfactory Responses to Natal Stream Water in Sockeye Salmon by BOLD fMRI" PLoS ONE 6 1: e16051 doi:101371/journalpone0016051 PMC 3022028 PMID 21264223  CS1 maint: Multiple names: authors list link
  • Bracis, Chloe 2010 A model of the ocean migration of Pacific salmon University of Washington
  • Johnsen S and Lohmann KJ 2005 "The physics and neurobiology of magnetoreception" Nature Reviews, Neuroscience, 6: 703–712
  • Johnsen S and Lohmann KJ 2008 "Magnetoreception in animals" Physics Today, Feature article, 61 3: 29–35
  • KJ Lohmann, CMF Lohmann and Endres CS 2008 "The sensory ecology of ocean navigation" J Exp Biol,211: 1719–1728
  • Mann S, Sparks NH, Walker MM, Kirschvink JL 1988 "Ultrastructure, morphology and organization of biogenic magnetite from sockeye salmon, Oncorhynchus nerka: implications for magnetoreception J Exp Biol 140: 35–49
  • Metcalfe J, Arnold G and McDowall R 2008 "Migration" pp 175–199 In: John D Reynolds, Handbook of fish biology and fisheries, Volume 1, John Wiley & Sons ISBN 978-0-632-05412-1
  • Moore A, Privitera L and Riley WD 2013 "The behaviour and physiology of migrating Atlantic salmon" In: H Ueda and K Tsukamoto eds,Physiology and Ecology of Fish Migration, CRC Press, pp 28–55 ISBN 9781466595132
  • Ueda, Hiroshi 2013 "Physiology of imprinting and homing migration in Pacific salmon" In: H Ueda and K Tsukamoto eds,Physiology and Ecology of Fish Migration, CRC Press, pp 1–27 ISBN 9781466595132
  • Walker M M, Diebel C E, Haugh C V, Pankhurst P M, Montgomery J C, Green C R 1997 "Structure and function of the vertebrate magnetic sense" Nature 390 6658: 371–6 doi:101038/37057 PMID 20358649  CS1 maint: Multiple names: authors list link
  • Wired Hacking Salmon’s Mental Compass to Save Endangered Fish 2 December 2008
Nitrogen
  • Cederholm CJ, Kunze MD, Murota T AND Sibatani T 1999 "Pacific salmon carcasses: essential contributions of nutrients and energy for aquatic and terrestrial ecosystems" Fisheries, 24 10: 6–15
  • Gresh T, Lichatowich J, Schoonmaker P 2000 "Salmon Decline Creates Nutrient Deficit in Northwest Streams" Fisheries, 15 1:15–21
  • Hocking MD and Reynolds JD 2011 "Impacts of salmon on riparian plant diversity Science, 331: 1609–1612
  • Naiman RJ, Bilby RE, Schindler DE and Helfield JM 2002 "Pacific salmon, nutrients, and the dynamics of freshwater and riparian ecosystems" PDF Ecosystems 5 4: 399 doi:101007/s10021-001-0083-3  CS1 maint: Multiple names: authors list link
  • Ruckelshaus MH, Levin P, Johnson JB and Kareiva PM 2002 "The Pacific salmon wars: what science brings to the challenge of recovering species" Annu Rev Ecol Syst, 33: 665–706
Resilience
  • Bottom DL, Jones KK, Simenstad CA and Smith CL 2009 "Reconnecting social and ecological resilience in salmon ecosystems" Ecology and Society, 14 1: 5
  • Bottom DL, Jones KK, Simenstad CA and Smith CL Eds 2010 Pathways to Resilient Salmon Ecosystems Ecology and Society, Special Feature

External links

  • Putting a Price on Salmon True Slant, 9 July 2009
  • Fish passage at dams Northwest Power and Conservation Council Retrieved 17 December 2011
  • Mystery Disease Found in Pacific Salmon Wired, 13 January 2011
  • Pacific Salmon: Anadromous Lifestyles US National Park Service
  • Study takes long-term, diversified view of salmon issues Mount Shasta News, 30 September 2009

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