Wikipedia

Estuary

(Redirected fromInverse estuary)
For other uses, seeEstuary (disambiguation).

Anestuaryis a partially enclosedcoastalbody ofbrackish waterwith one or more rivers or streams flowing into it, and with a free connection to the opensea.[1]Estuaries form a transition zone betweenriverenvironments and maritime environments and are an example of anecotone.Estuaries are subject both to marine influences such astides,waves,and the influx ofsaline water,and to fluvial influences such as flows of freshwater and sediment. The mi xing ofseawaterandfreshwaterprovides high levels of nutrients both in the water column and insediment,making estuaries among the most productive natural habitats in the world.[2]

Río de la Plataestuary

Most existing estuaries formed during theHoloceneepoch with the flooding of river-eroded or glacially scoured valleys when the sea level began to rise about 10,000–12,000 years ago.[3]Estuaries are typically classified according to theirgeomorphologicalfeatures or to water-circulation patterns. They can have many different names, such asbays,harbors,lagoons,inlets,orsounds,although some of these water bodies do not strictly meet the above definition of an estuary and could be fully saline.

Many estuaries sufferdegenerationfrom a variety of factors includingsoil erosion,deforestation,overgrazing,overfishingand the filling of wetlands.Eutrophicationmay lead to excessive nutrients from sewage and animal wastes; pollutants includingheavy metals,polychlorinated biphenyls,radionuclidesandhydrocarbonsfrom sewage inputs; and diking or damming forflood controlor water diversion.[3][4]

Definition

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New York–New Jersey Harbor Estuary
River Exeestuary
Estuary mouth located inDarwin,Northern Territory,Australia
A crowded estuary mouth inParavurnear the city ofKollam,India
Estuary mouth of theYachats RiverinYachats, Oregon
Amazon Riverestuary

The word "estuary" is derived from the Latin wordaestuariummeaning tidal inlet of the sea, which in itself is derived from the termaestus,meaning tide. There have been many definitions proposed to describe an estuary. The most widely accepted definition is: "a semi-enclosed coastal body of water, which has a free connection with the open sea, and within which seawater is measurably diluted with freshwater derived from land drainage".[1]However, this definition excludes a number of coastal water bodies such as coastal lagoons andbrackishseas.

A more comprehensive definition of an estuary is "a semi-enclosed body of water connected to the sea as far as thetidal limitor the salt intrusion limit and receiving freshwater runoff; however thefreshwater inflowmay not be perennial, the connection to the sea may be closed for part of the year and tidal influence may be negligible ".[3]This broad definition also includesfjords,lagoons,river mouths,andtidal creeks.An estuary is a dynamicecosystemhaving a connection to the open sea through which thesea waterenters with the rhythm of thetides.The effects of tides on estuaries can shownonlineareffects on the movement of water which can have important impacts on the ecosystem and waterflow. The seawater entering the estuary is diluted by thefresh waterflowing from rivers and streams. The pattern of dilution varies between different estuaries and depends on the volume of freshwater, the tidal range, and the extent of evaporation of the water in the estuary.[2]

Classification based on geomorphology

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Drowned river valleys

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Main article:Ria

Drowned river valleys are also known as coastal plain estuaries. In places where the sea level is rising relative to the land, sea water progressively penetrates into river valleys and the topography of the estuary remains similar to that of a river valley. This is the most common type of estuary in temperate climates. Well-studied estuaries include theSevern Estuaryin theUnited Kingdomand theEms Dollardalong the Dutch-German border.

The width-to-depth ratio of these estuaries is typically large, appearing wedge-shaped (in cross-section) in the inner part and broadening and deepening seaward. Water depths rarely exceed 30 m (100 ft).Examples of this type of estuaryin the U.S. are theHudson River,Chesapeake Bay,andDelaware Bayalong theMid-Atlanticcoast, andGalveston BayandTampa Bayalong theGulf Coast.[5]

Lagoon-type or bar-built

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See also:Mouth bar

Bar-built estuaries are found in a place where the deposition of sediment has kept pace with rising sea levels so that the estuaries are shallow and separated from the sea by sand spits or barrier islands. They are relatively common in tropical and subtropical locations.

These estuaries are semi-isolated from ocean waters by barrier beaches (barrier islandsand barrierspits). Formation of barrier beaches partially encloses the estuary, with only narrow inlets allowing contact with the ocean waters. Bar-built estuaries typically develop on gently sloping plains located along tectonically stable edges of continents and marginal sea coasts. They are extensive along the Atlantic and Gulf coasts of the U.S. in areas with active coastal deposition of sediments and where tidal ranges are less than 4 m (13 ft). The barrier beaches that enclose bar-built estuaries have been developed in several ways:

  • building up of offshore bars by wave action, in which sand from the seafloor is deposited in elongated bars parallel to the shoreline,
  • reworking of sediment discharge from rivers by a wave, current, and wind action into beaches, overwash flats, and dunes,
  • engulfment of mainland beach ridges (ridges developed from the erosion of coastal plain sediments around 5000 years ago) due tosea level riseand resulting in the breaching of the ridges and flooding of the coastal lowlands, forming shallow lagoons,
  • elongation of barrier spits from the erosion of headlands due to the action oflongshore currents,with the spits growing in the direction of the littoral drift.[citation needed]

Fjord-type

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Fjords were formed where Pleistocene glaciers deepened and widened existing river valleys so that they become U-shaped in cross-sections. At their mouths there are typically rocks, bars orsillsofglacial deposits,which have the effects of modifying the estuarine circulation.

Fjord-type estuaries are formed in deeply eroded valleys formed byglaciers.These U-shaped estuaries typically have steep sides, rock bottoms, and underwater sills contoured by glacial movement. The estuary is shallowest at its mouth, where terminal glacialmorainesor rock bars form sills that restrict water flow. In the upper reaches of the estuary, the depth can exceed 300 m (1,000 ft). The width-to-depth ratio is generally small. In estuaries with very shallow sills, tidal oscillations only affect the water down to the depth of the sill, and the waters deeper than that may remain stagnant for a very long time, so there is only an occasional exchange of the deep water of the estuary with the ocean. If the sill depth is deep, water circulation is less restricted, and there is a slow but steady exchange of water between the estuary and the ocean. Fjord-type estuaries can be found along the coasts ofAlaska,thePuget Soundregion of westernWashington state,British Columbia,eastern Canada,Greenland,Iceland,New Zealand, and Norway.

Tectonically produced

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These estuaries are formed by subsidence or land cut off from the ocean by land movement associated withfaulting,volcanoes,andlandslides.Inundationfrom eustatic sea-level rise during theHoloceneEpochhas also contributed to the formation of these estuaries. There are only a small number oftectonicallyproduced estuaries; one example is theSan Francisco Bay,which was formed by the crustal movements of theSan Andreas Faultsystem causing the inundation of the lower reaches of theSacramentoandSan Joaquin rivers.[6]

Classification based on water circulation

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See also:Estuarine water circulation

Salt wedge

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"Salt wedge" redirects here. Not to be confused withSalt wedging (geology).
See also:Saltwater intrusion

In this type of estuary, river output greatly exceeds marine input and tidal effects have minor importance. Freshwater floats on top of the seawater in a layer that gradually thins as it moves seaward. The denser seawater moves landward along the bottom of the estuary, forming a wedge-shaped layer that is thinner as it approaches land. As a velocity difference develops between the two layers, shear forces generate internal waves at the interface, mi xing the seawater upward with the freshwater. An examples of a salt wedge estuary isMississippi River[6]and theMandovi estuaryinGoaduring the monsoon period.

Partially mixed

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As tidal forcing increases, river output becomes less than the marine input. Here, current induced turbulence causes mi xing of the whole water column such that salinity varies more longitudinally rather than vertically, leading to a moderately stratified condition. Examples include theChesapeake BayandNarragansett Bay.[6]

Well-mixed

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Tidal mi xing forces exceed river output, resulting in a well-mixed water column and the disappearance of the vertical salinitygradient.The freshwater-seawater boundary is eliminated due to the intenseturbulent mi xingandeddy effects.The lower reaches ofDelaware Bayand theRaritan RiverinNew Jerseyare examples of vertically homogeneous estuaries.[6]

Inverse

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Inverse estuaries occur in dry climates where evaporation greatly exceeds the inflow of freshwater. A salinity maximum zone is formed, and both riverine and oceanic water flow close to the surface towards this zone.[7]This water is pushed downward and spreads along the bottom in both the seaward and landward direction.[3]Examples of an inverse estuary areSpencer Gulf,South Australia,[8]Saloum RiverandCasamance River,Senegal.[9]

Intermittent

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Estuary type varies dramatically depending on freshwater input, and is capable of changing from a wholly marineembaymentto any of the other estuary types.[10][11]

Physiochemical variation

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The most important variable characteristics of estuary water are the concentration of dissolved oxygen,salinityandsedimentload. There is extreme spatial variability in salinity, with a range of near-zero at thetidal limitof tributary rivers to 3.4% at the estuary mouth. At any one point, the salinity will vary considerably over time and seasons, making it a harsh environment for organisms. Sediment often settles in intertidalmudflatswhich are extremely difficult to colonize. No points of attachment exist foralgae,so vegetation based habitat is not established.[clarification needed]Sediment can also clog feeding and respiratory structures of species, and special adaptations exist within mudflat species to cope with this problem. Lastly,dissolved oxygenvariation can cause problems for life forms. Nutrient-rich sediment from human-made sources can promote primary production life cycles, perhaps leading to eventual decay removing the dissolved oxygen from the water; thushypoxicoranoxiczones can develop.[12]

Implications of eutrophication on estuaries

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Further information:Eutrophication § Coastal waters

Effects of eutrophication on biogeochemical cycles

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Processes that nitrogen undergo in estuarine systems

Nitrogen is often the lead cause ofeutrophicationin estuaries in temperate zones.[13]During a eutrophication event, biogeochemical feedback decreases the amount of availablesilica.[14]These feedbacks also increase the supply ofnitrogenand phosphorus, creating conditions where harmful algal blooms can persist. Given the now off-balancenitrogen cycle,estuaries can be driven tophosphoruslimitation instead of nitrogen limitation. Estuaries can be severely impacted by an unbalanced phosphorus cycle, as phosphorus interacts with nitrogen and silica availability.

With an abundance of nutrients in the ecosystem, plants and algae overgrow and eventually decompose, which produce a significant amount of carbon dioxide.[15]While releasing CO2into the water and atmosphere, these organisms are also intaking all or nearly all of the available oxygen creating ahypoxicenvironment and unbalancedoxygen cycle.[16]The excess carbon in the form of CO2can lead to low pH levels andocean acidification,which is more harmful for vulnerable coastal regions like estuaries.

Effects of eutrophication on estuarine plants

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A salt marsh with wood storks wading

Eutrophicationhas been seen to negatively impact many plant communities in estuarineecosystems.[17]Salt marshesare a type of ecosystem in some estuaries that have been negatively impacted by eutrophication.[17]Cordgrassvegetation dominates the salt marsh landscape.[18]Excess nutrients allow the plants to grow at greater rates in above ground biomass, however less energy is allocated to the roots since nutrients is abundant.[17][19]This leads to a lowerbiomassin the vegetation below ground which destabilizes the banks of the marsh causing increased rates oferosion.[17]A similar phenomenon occurs inmangrove swamps,which are another potential ecosystem in estuaries.[19][20]An increase in nitrogen causes an increase in shoot growth and a decrease in root growth.[19]Weaker root systems cause a mangrove tree to be less resilient in seasons of drought, which can lead to the death of the mangrove.[19]This shift in above ground and below ground biomass caused by eutrophication could hindered plant success in these ecosystems.[17][19]

Effects of eutrophication on estuarine animals

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Example of a whitefish

Across all biomes,eutrophicationoften results in plant death but the impacts do not end there. Plant death alters the entire food web structure which can result in the death of animals within the afflictedbiome.Estuaries are hotspots forbiodiversity,containing a majority of commercial fish catch, making the impacts of eutrophication that much greater within estuaries.[21]Some specific estuarine animals feel the effects of eutrophication more strongly than others. One example is the whitefish species from theEuropean Alps.[22]Eutrophication reduced the oxygen levels in their habitats so greatly that whitefish eggs could not survive, causing local extinctions.[22]However, some animals, such as carnivorous fish, tend to do well in nutrient-enriched environments and can benefit from eutrophication.[23]This can be seen in populations of bass or pikes.[23]

Effects of eutrophication on human activities

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Commercial fishing boat

Eutrophication can affect many marine habitats which can lead to economic consequences. The commercial fishing industry relies upon estuaries for approximately 68 percent of their catch by value because of the great biodiversity of this ecosystem.[24]During analgal bloom,fishermen have noticed a significant increase in the quantity of fish.[25]A sudden increase in primary productivity causes spikes in fish populations which leads to more oxygen being utilized.[25]It is the continued deoxygenation of the water that then causes a decline in fish populations. These effects can begin in estuaries and have a wide effect on the surrounding water bodies. In turn, this can decrease fishing industry sales in one area and across the country.[26]Production in 2016 from recreational and commercial fishing contributes billions of dollars to the United States' gross domestic product (GDP).[24]A decrease in production within this industry can affect any of the 1.7 million people the fishing industry employs yearly across the United States.

Implications for marine life

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Estuaries are incredibly dynamic systems, where temperature, salinity, turbidity, depth and flow all change daily in response to the tides. This dynamism makes estuaries highly productive habitats, but also make it difficult for many species to survive year-round. As a result, estuaries large and small experience strong seasonal variation in their fish communities.[27]In winter, the fish community is dominated by hardy marine residents, and in summer a variety of marine and anadromous fishes move into and out of estuaries, capitalizing on their high productivity.[28]Estuaries provide a critical habitat to a variety of species that rely on estuaries for life-cycle completion. Pacific Herring (Clupea pallasii) are known to lay their eggs in estuaries and bays, surfperch give birth in estuaries, juvenile flatfish and rockfish migrate to estuaries to rear, andanadromoussalmonidsandlampreysuse estuaries as migration corridors.[29]Also,migratorybird populations, such as theblack-tailed godwit,[30]rely on estuaries.

Two of the main challenges of estuarine life are the variability insalinityandsedimentation.Many species offishandinvertebrateshave various methods to control or conform to the shifts in salt concentrations and are termedosmoconformersandosmoregulators.Many animals alsoburrowto avoidpredationand to live in a more stable sedimental environment. However, large numbers of bacteria are found within the sediment which has a very high oxygen demand. This reduces the levels of oxygen within the sediment often resulting in partiallyanoxicconditions, which can be further exacerbated by limited water flow.

Phytoplanktonare key primary producers in estuaries. They move with the water bodies and can be flushed in and out with thetides.Their productivity is largely dependent upon theturbidityof the water. The main phytoplankton present arediatomsanddinoflagellateswhich are abundant in the sediment.

A primary source of food for many organisms on estuaries, includingbacteria,isdetritusfrom the settlement of the sedimentation.

Human impact

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Further information:Ecosystem service § Estuarine and coastal ecosystem services,andMarine ecosystem § Threats

Of the thirty-two largest cities in the world in the early 1990s, twenty-two were located on estuaries.[31]

As ecosystems, estuaries are under threat from human activities such aspollutionandoverfishing.They are also threatened by sewage, coastal settlement, land clearance and much more. Estuaries are affected by events far upstream, and concentrate materials such as pollutants and sediments.[32]Land run-off and industrial, agricultural, and domestic waste enter rivers and are discharged into estuaries. Contaminants can be introduced which do not disintegrate rapidly in the marine environment, such asplastics,pesticides,furans,dioxins,phenolsandheavy metals.

Such toxins can accumulate in the tissues of many species of aquatic life in a process calledbioaccumulation.They also accumulate inbenthicenvironments, such as estuaries andbay muds:a geological record of human activities of the last century. The elemental composition ofbiofilmreflect areas of the estuary impacted by human activities, and over time may shift the basic composition of the ecosystem, and the reversible or irreversible changes in the abiotic and biotic parts of the systems from the bottom up.[33]

For example, Chinese and Russian industrial pollution, such as phenols and heavy metals, has devastated fish stocks in theAmur Riverand damaged its estuary soil.[34]

Estuaries tend to be naturallyeutrophicbecauseland runoffdischarges nutrients into estuaries. With human activities, land run-off also now includes the many chemicals used as fertilizers in agriculture as well as waste from livestock and humans. Excess oxygen-depleting chemicals in the water can lead tohypoxiaand the creation ofdead zones.[35]This can result in reductions in water quality, fish, and other animal populations. Overfishing also occurs.Chesapeake Bayonce had a flourishingoysterpopulation that has been almost wiped out by overfishing. Oysters filter these pollutants, and either eat them or shape them into small packets that are deposited on the bottom where they are harmless. Historically the oysters filtered the estuary's entire water volume of excess nutrients every three or four days. Today that process takes almost a year,[36]and sediment, nutrients, and algae can cause problems in local waters.

Some major rivers that run through deserts historically had vast, expansive estuaries that have been reduced to a fraction of their former size, because of dams and diversions. One example is theColorado River Deltain Mexico, historically covered with marshlands and forests, but now essentially a salt flat.

Examples

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Africa

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Asia

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Europe

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North America

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Oceania

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South America

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See also

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References

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  42. ^"The Amazon River Estuary".etai's web.
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