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Topic: Mnemiopsis


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  Mnemiopsis - Wikipedia, the free encyclopedia
Mnemiopsis is a genus of ctenophore (comb jellies).
Mnemiopsis have a body that is oval-shaped and transparent, with four rows of ciliated combs that run along the body vertically and glow green when disturbed at night.
Mnemiopsis is a carnivore that consumes copepods, larvae, and fish eggs.
en.wikipedia.org /wiki/Mnemiopsis   (267 words)

  
 Biological Review of Mnemiopsis leidyi in the Native Habitat
Mnemiopsis is extensively studied in the North-American area of its habitat, which covers the Atlantic coastal zone of both American continents from latitude 40
With the increase in the ctenophore population, the number of zooplankton in its habitat drastically diminishes, as Mnemiopsis is a voracious feeder on it.
In its native habitat the population of Mnemiopsis is controlled by predators feeding on it.
www.math.rsu.ru /niimpm/ommee/selut/IntasHtml/IntRepPart5Sect3.html   (1077 words)

  
 [No title]
mainly the medusa Aurelia aurita, and ctenophore Mnemiopsis sp.; Shushkina and Musayeva, 1990a).
Mnemiopsis mccradyi is able to produce 8,000 eggs within 23 days, after 13 days of its own birth (Baker and Reeve, 1974).
Population dynamics and ecological energetics of a pulsed zooplankton predator, the ctenophore Mnemiopsis leidyi.
www.ims.metu.edu.tr /cv/kideys/bs_ecosystem.htm   (5858 words)

  
 Mnemiopsis   (Site not responding. Last check: 2007-10-23)
MNEMIOPSIS DESCRIPTION: The genus Mnemiopsis belongs to the ctenophore phylum.
HABITAT: Mnemiopsis is mostly found in areas of brackish water.
FEEDING: Mnemiopsis is a carnivore that consumes copepods, larvae, and fish eggs.
bopedia.com /en/wikipedia/m/mn/mnemiopsis.html   (240 words)

  
 Mnemiopsis Leidyi in the Caspian Sea: The First Mnemiopsis Advisory Group Workshop. Attachment 7
The ctenophore Mnemiopsis leidyi, the most recent invader to the Caspian Sea, is native to the coastal areas of northern America and first appeared in the Black Sea in the early 1980s, having been accidentally introduced with ballast water of ships.
Mnemiopsis is blamed for the collapse of commercial fisheries in the Black Sea in the second half of 1980s and Azov sea in the 1990s.
Mnemiopsis has expanded in the Caspian Sea, in 2001 at a rate sufficient to reach levels that could critically endanger the current functioning of the ecosystem and pose grave risks of extinction to a range of species, mainly invertebrates, but also fish (kilka and other species, including beluga sturgeon).
www.caspianenvironment.org /mnemiopsis/2mnem_attach7.htm   (1588 words)

  
 Mnemiopsis   (Site not responding. Last check: 2007-10-23)
Mnemiopsis is native to the coastal estuarine waters of the Northwest Atlantic coast between Cape Cod and South Texas in the Gulf of Mexico (Kremer, 1994).
Despite the availability of a significant number of experimental and field studies on the physiology and ecology of Mnemiopsis (Kremer, 1994; Reeve et al, 1989) not all the ecological and population characteristics necessary for a description of the quantitative dynamics are fully understood.
Mnemiopsis could be considered an r- strategist in the sense that its high competitiveness stems from a very high fertility.
www.gis.rnd.runnet.ru /team/Projects/mtbase/part1-2-7.html   (428 words)

  
 WHOI : People : Rebecca Gast : Projects   (Site not responding. Last check: 2007-10-23)
This collaborative project focuses on the characterization, phylogeny, and functional impact of a specific assemblage of epicommensal protists associated with the lobate ctenophore, Mnemiopsis leidyi, a keystone predator of marine coastal planktonic communities extending from the Gulf of Mexico along the Atlantic Coast to New England.
Mnemiopsis can alter community structure through voracious predation on zooplankton populations to the point where this resource becomes limiting to other predator species (i.e., fish).
Mnemiopsis is also a globally invasive organism that has demonstrated its capacity to disrupt the trophic structure of coastal communities worldwide, with severe economic consequences.
www.whoi.edu /hpb/viewPage.do?id=1162&cl=5   (304 words)

  
 issg Database: Ecology of Mnemiopsis leidyi   (Site not responding. Last check: 2007-10-23)
The ctenophore Mnemiopsis ledyi is a major carnivorous predator of edible zooplankton (including meroplankton), pelagic fish eggs and larvae and is associated with fishery crashes.
The native habitat of the ctenophore, Mnemiopsis, is in temperate to subtropical estuaries along the Atlantic coast of North and South America (Mayer,1912).
Native range: The native habitat of the ctenophore, Mnemiopsis, is in temperate to subtropical estuaries along the Atlantic coast of North and South America between 40 degrees north to 46 degrees south (Mayer, 1912, Costello, 2001).
issg.appfa.auckland.ac.nz /database/species/ecology.asp?si=95&fr=1&sts=   (1782 words)

  
 Alien species   (Site not responding. Last check: 2007-10-23)
Investigations of a new invader, Mnemiopsis leidyi, in the Caspian Sea in 2000 showed that Mnemiopsis was distributed mainly in the middle and southern Caspian Sea.
The native habitat of ctenophores in the genus Mnemiopsis is in estuaries along the eastern coastline of North and South America.
Mnemiopsis is probably the most-studied ctenophore genus in the world because of its great abundance in estuaries in heavily populated areas of the United States, and because of its explosive population growth after accidental introduction into the Black Sea in the early 1980s.
enrin.grida.no /caspian/priority_issues/alien_species/state.htm   (505 words)

  
 Mnemiopsis Leidyi in the Caspian Sea: First International Meeting. Meeting Report
Shiganova briefly described the history of the Mnemiopsis invasion of the Black Sea; she presented the situation with Mnemiopsis after 1995 which was characterized by a peak in biomass that was observed in spring and summer, followed by a second decrease.
The goal of this study was to estimate the predatory impact of the alien ctenophores Mnemiopsis leidyi and Beroe ovata on the planktonic community of inshore waters in the Black Sea.
Mnemiopsis has been found in the Caspian Sea in abundance from 1995 (Iran) to 1998 (Azerbaijan), with the first certified observation in 1999 (Russia); in late 2000, Mnemiopsis was recorded with findings of specimens of different sizes.
www.caspianenvironment.org /mnemiopsis/mnem_report.htm   (3622 words)

  
 Chap. 2.3 - No. 58   (Site not responding. Last check: 2007-10-23)
Mnemiopsis ingests virtually any organism that it is able to capture with its oral lobes, including holoplanktonic organisms, the planktonic larvae of benthic organisms, and the eggs and larvae of fishes (e.g.
2.3.1 Diseases, Parasites and Predators of Mnemiopsis leidyi
Invertebrate and vertebrate predators on Mnemiopsis leidyi are known in the Americas, and members of both groups have been reported to control its population density.
gesamp.imo.org /no58/dist_b_a.htm   (1220 words)

  
 The little 'monster' threatening caviar
It is not just that mnemiopsis feeds on the same plankton that nourish the kilka sprats on which larger fish, such as the caviar-producing beluga sturgeon, live.
Since mnemiopsis was first discovered in the Caspian in 1999, its population has risen by an estimated 5000per cent.
After beroe arrived in 1997, the mnemiopsis population began to decline rapidly and plankton and fish stocks stabilised.
www.sturgeonaquafarms.com /News/2005-the-little-monster-threatening-caviar.htm   (465 words)

  
 Ctenophore References
Invasion of the Caspian Sea by the comb jellyfish Mnemiopsis leidyi (Ctenophora).
Distribution of the alien ctenophore Mnemiopsis leidyi in the Caspian Sea in August 2001.
Escape of the ctenophore Mnemiopsis leidyi from the scyphomedusa predator Chrysaora quinquecirrha.
jellieszone.com /ctenophorereferences.htm   (1164 words)

  
 Aliens may demolish Black Sea   (Site not responding. Last check: 2007-10-23)
By 1990, the total mass in the Black Sea of all the jellyfish-like creatures, known as Mnemiopsis leidyi, was estimated at 1 billion tons - equal to the total wet weight of all the fish caught in the world that year.
The tale of mnemiopsis - pronounced ne-me-op-sis - reflects the devastation that a single alien species can cause in an almost closed ecosystem.
Mnemiopsis, a hermaphrodite that is able to reproduce independently, has declined a bit in the Black Sea.
www.lubbockonline.com /news/120897/LA0504.html   (285 words)

  
 URI Biological Oceanographers Awarded National Science Foundation Grant to Study Increases in Jellyfish Population
At the location of the study in Narragansett Bay, Rhode Island, the increases in Mnemiopsis have been accompanied by seasonal shifts in their appearance from late summer to early spring during years with earlier warming of bay water temperatures.
Mnemiopsis leidyi is the same organism that has traveled from its usual home in northeastern U.S. waters in ballast water to invade and severely disrupt commercial fisheries in the Black Sea and the Sea of Azov.
Previous research indicates that this ctenophore is capable of clearing 100% of the fish eggs present in the upper reaches of the Bay when the outbreak of this jellyfish is at its maximum.
www.uri.edu /news/releases/html/01-0926.html   (539 words)

  
 Russian Science News
C. mnemiopsis has caused serious damage to the Black Sea ecosystem, so the researchers believe the appearance of C. beroe is for the better.
Mnemiopsis was brought into the Black Sea with ballast waters in the 1980s.
By the way any Ctenophora, including beroe and mnemiopsis, look like big soap-bubble, sometimes oval, sometimes flattened, with two long tentacles near oral hole and meridional lines of cilia on the surface of the bubble.
www.informnauka.ru /eng/2000/2000-09-01-022_e.htm   (516 words)

  
 Home
Mnemiopsis leidyi on the eastern Iranian coasts of the Caspian Sea.
Mnemiopsis in the Sea of Marmara in 2001.
Abundance and biomass of Mnemiopsis leidyi in the southern Caspian Sea (Mazandaran and Golestan provinces) 2001-2002.
www.ims.metu.edu.tr /cv/kideys/Publ.htm   (7179 words)

  
 References
Predation by and distribution of a ctenophore Mnemiopsis leidyi A. Agassiz, in the New York estuary.
Predation on the ctenophore Mnemiopsis leidyi by butterfish Perpilus triacanthus in Narragansett bay, Rhode Island.
Ctenophore Mnemiopsis invasion in the Azov Sea: primary estimation of the consequences.
www.math.rsu.ru /niimpm/ommee/selut/IntasHtml/IntRepPart5Ref.html   (876 words)

  
 Molecular Systematics of the Invasive Ctenophore, Mnemiopsis sp.
Molecular Systematics of the Invasive Ctenophore, Mnemiopsis sp.
Geographic analysis of ITS1/ITS2 composite genotypes indicates that South American Mnemiopsis (Argentina and Brazil) are isolated from North American populations (Atlantic/Gulf of Mexico coasts) and a weak population break exists around Cape Hatteras in North American waters.
All invasive Mnemiopsis share genotypes with North American ctenophores, with the largest overlap occurring between invasive ctenophores and those south of Cape Hatteras into the Gulf of Mexico.
www.sgnis.org /publicat/bayhmcdo.htm   (279 words)

  
 Mary Beth Decker
The native habitats of the ctenophore, Mnemiopsis, are temperate to subtropical estuaries along the Atlantic coast of North and South America, where it is found in an extremely wide range of environmental conditions (winter low and summer high temperatures of 2 and 32 °C, respectively, and salinities of <2­38).
In native habitats, predators of Mnemiopsis often limit their populations, and zooplanktivorous fish are abundant and may compete with the ctenophores for food.
We conclude that the enormous impact of Mnemiopsis on the Black Sea ecosystem occurred because of the shortage of predators and competitors in the late 1980s and early 1990s.
www.yale.edu /decker/research.htm   (3802 words)

  
 IBSS NASU. Black Sea. Ctenophora. Mnemiopsis   (Site not responding. Last check: 2007-10-23)
Anatomy of gonads and propagation of Ctenophore Mnemiopsis in the Black Sea.
In an invading ctenophoran species of from the Black Sea (Mnemiopsis sp.) the gonads lie only in the walls of 8 meridiorial canals but in the walls of auricular canals under the flagellar rows as well.
Mnemiopsis: a - ovaries localization, b - gonads, 20 h p.m., c - gonads, 22 h p.m., m.k.
www.ibss.iuf.net /blacksea/species/freelife/ctenophora/mnemrev1.html   (195 words)

  
 Boston.com / News / Science / Slimy stowaway may be key to saving distant seas
This ecological monster, a voracious jellyfish called Mnemiopsis leidyi, was accidentally transported from the backwaters of the US eastern seaboard two decades ago in the hull of a ship.
The invasion of Mnemiopsis is one of the most startling cases of the global spread of alien species -- most of which hitchhike one way or another with traveling humans.
The Mnemiopsis, a comb or non-stinging jellyfish, once lived modestly from Maine to Florida, grazing on plankton while being kept in check by countless other jellyfish-eating species.
www.boston.com /news/science/articles/2004/03/23/slimy_stowaway_may_be_key_to_saving_distant_seas   (1079 words)

  
 Mnemiopsis leidyi - Biology
Mnemiopsis also occurs during the winter in Chesapeake Bay, generally in low numbers and biomass (Miller, 1974; Burrell and Van Engel, 1976; Purcell, et al.2001).
Since its accidental introduction to the Black Sea, Mnemiopsis has spread to adjacent bodies of water, inhabiting waters of salinities ranging from 3 in the Sea of Azov to 39‰ in the eastern Mediterranean, and temperatures ranging from 4°C in winter to 31°C in summer.
In 1999 Mnemiopsis was recorded in the Caspian Sea, where it was introduced with ballast waters.
www.zin.ru /projects/invasions/gaas/mnelei_b.htm   (2558 words)

  
 Alien species   (Site not responding. Last check: 2007-10-23)
At night, with their spotlights on, the fishermen can see that the sea is infested with the little "gelatinous monsters", which are no larger than five centimetres (two inches) in length.
The Mnemiopsis is originally thought to have come from Florida.
But now they are starting to recover, and the Mnemiopsis has been almost wiped out - not by humans, but by another, very similar, but slightly larger gelatinous plankton called Beroe.
enrin.grida.no /caspian/priority_issues/alien_species/bbc_report.htm   (625 words)

  
 ASLO Summer Meeting 2005, Santiago de Compostela, Spain   (Site not responding. Last check: 2007-10-23)
Clearance and growth rates of the ctenophore Mnemiopsis leidyi were investigated under laboratory conditions.
Mnemiopsis individuals were collected in the Varna Bay (Western Black Sea) and fed with a mixture of mesozooplankton (copepods, cladocerans and meroplankton).
Stomach content composition of Mnemiopsis leidyi was simultaneously investigated under natural and experimental conditions.
aslo.org /meetings/santiago2005/abstracts/1269.htm   (200 words)

  
 Aquatic invasions in the Black, Caspian, and Mediterranean Seas -
Population dynamics of Mnemiopsis leidyi in the Caspian Sea, and effects on the Caspian ecosystem; T.A. Shiganova, et al.
A brief résumé of the status of the Mnemiopsis population in the Turkmen sector of the Caspian Sea according to observations during the first half of 2002; F.M. Shakirova.
Dynamics of Mnemiopsis distribution in the Azerbaijan sector of the Caspian Sea in 2001 - 2002; Z.M. Kulijev.
www.onefish.org /cds_static/en/aquatic_invasions_black_caspian_seas_en_107722_222732.html   (684 words)

  
 Caspian: Influx Of Killer Jellyfish Threatens Fish Stocks - RADIO FREE EUROPE / RADIO LIBERTY   (Site not responding. Last check: 2007-10-23)
Such is the case with Mnemiopsis leidyi, a fist-sized jellyfish that has spent the past decade menacing the waters of the Caspian Sea.
The invasion of Mnemiopsis leidyi, or Leidy's Comb Jelly, has caused the Caspian's fish stocks to plunge, affecting the livelihoods of many local fishermen.
The newcomer began dining on Mnemiopsis, causing its almost immediate decline, and allowing a resurge in the Black Sea's valuable anchovy stocks.
www.rferl.org /featuresarticle/2004/06/d4beb0c9-eaec-4030-b330-e93fb974c99f.html   (813 words)

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