Monday, May 27, 2013

Memorial Day, 2013

Gentlemen,

Let's not forget why we today is a day off from school.  Let's not forget who the real heroes are.

May God continue to bless this great nation.






Memorial Day and the “Shepherd in Combat Boots”


U.S. Army chaplain Father Emil Joseph Kapaun, who died May 23, 1951, in a North Korean prisoner of war camp, is pictured celebrating Mass from the hood of a jeep Oct. 7, 1950, in South Korea. He was captured about a month later. The Medal of Honor, the nation’s highest military award for bravery, was awarded to the priest posthumously at the White House April 11, 2013. (CNS photo/courtesy U.S. Army medic Raymond Skeehan)

For many, Memorial Day marks the unofficial start of summer, a day of rest to spend with family and friends. But for all Americans, this should be a time to remember the sacrifice of those men and women who, in the words of President Lincoln, “gave the last full measure of devotion,” sacrificing their lives to preserve our freedom. Masses will be celebrated today at theCatholic cemeteries of the Archdiocese of Washington, to remember those who died in service to the nation, and to pray for loved ones who died this past year.

“No one has greater love than this – to lay down one’s life for one’s friend” (John 15:13). In recent weeks, Father Emil Kapaun – a Korean War chaplain who embodied those words – was remembered and honored in both a White House ceremony and at an outdoor Mass at Saint Jude Regional Catholic School in Rockville, Maryland.

Father Kapaun died on May 23, 1951, in a prisoner of war camp in North Korea, and he was buried in an unmarked grave. But his faith and his courage were never forgotten, especially not by the soldiers to whom he ministered on the battlefield and in the prison camp.

This man, remembered as “the shepherd in combat boots,” grew up on a family farm outside of Wichita, Kansas. After serving as a chaplain in World War II, he became a small-town parish priest back home. When the Korean War broke out, he again became an Army chaplain, and his regiment was one of the first sent into combat.

The soft-spoken priest soon became known for the Masses he celebrated on the hoods of Jeeps. He also rode an old bicycle to the front lines to minister to soldiers, and earned a Bronze Star for dodging machine gun fire and dragging wounded troops to safety.

Later, Father Kapaun ignored an evacuation order, opting instead to stay with wounded troops who were subsequently captured by the Chinese and North Korean forces that surrounded them. After helping a wounded Chinese officer, he stopped another Chinese soldier from executing a wounded American soldier, Herb Miller. Father Kapaun carried Miller on his back and helped him walk as the men were forced to make a long death march to a prison camp.

At the camp, Father Kapaun became a parish priest for the prisoners of war there, using his farm skills to get them sanitary drinking water and sneak them food. He prayed the rosary and gave hope to prisoners of all different faiths. A fellow prisoner later said the priest could turn a mud hut into a cathedral.

The guards saw the opportunity to rid themselves of Father Kapaun when he became ill, so he was taken to an isolated hut to die. He blessed his guards, repeating the words of Jesus on the cross, “Father forgive them.” He told his fellow soldiers not to worry, “I’m going to where I always wanted to go.” A few days later, he died in that death house.

Those fellow soldiers helped collect money after the war to establish Kapaun Mount Carmel Catholic High School in Wichita. In 2001, a bronze statue showing the priest helping a wounded soldier to his feet was dedicated at the priest’s hometown parish, Saint John Nepomucene Catholic Church in Pilsen, Kansas, where the cause for his canonization was later opened in 2008.

Father Kapaun was posthumously awarded the nation’s highest military honor, the Medal of Honor, on April 11. President Obama noted that when the Korean War ended 60 years ago, a group of POWs emerged carrying a four-foot cross they had fashioned out of firewood, with radio wire as a crown of thorns, to honor their priest, Father Kapaun. Some of those men, including Herb Miller, attended the White House ceremony.

“This is the valor we honor today – an American soldier who didn’t fire a gun, but who wielded the mightiest weapon of all, a love for his brothers so pure that he was willing to die so they might live,” President Obama said.

Earlier this month, Father Paul Lee, the pastor of the Shrine of Saint Jude Parish in Rockville, whose family was among the refugees who fled from Communist North Korea, celebrated an outdoor Mass on the hood of a Jeep for the students of Saint Jude School so they would remember the faith and sacrifice of this heroic priest.

This Memorial Day is a special time of prayer and remembrance, for Father Kapaun and for all those who have died to preserve our freedom. At a time when our freedom of conscience is increasingly challenged by government actions, we should stop to pray and thank God for their sacrifice, and resolve to stand up for the freedoms for which they gave their lives. One hundred and fifty years ago at Gettysburg, President Lincoln urged us to honor our military dead by taking up “the unfinished work” of safeguarding our freedom. That is our responsibility as Americans, this Memorial Day and every day.

Saturday, May 25, 2013

And Then There Were None...(or certainly a lot less)

Phenomenal excerpt from Scientific American Online.  I pasted part of the excerpt below.  Here's the link to the full excerpt on Scientific American's website:

Scientific American - book excerpt


Net Loss: How We Continually Forget What the Oceans Really Used to Be Like [Excerpt]
The phenomenon of shifting baselines means that each generation fails to realize how much worse the oceans are getting



Image: Flickr / sludgegulper

From The Perfect Protein: The Fish Lover's Guide to Saving the Oceans and Feeding the World, by Andy Sharpless and Suzannah Evans. Rodale Books. Copyright © 2013, by Oceana.

TRAWLING REVOLUTIONIZED FISHING. For millennia, humans had been catching fish by net, trap, spear, and hook. The first bottom trawls were 20-foot nets weighted by stones and lead in the closed "cod" end. The front end of the net was held open by a wooden or steel beam. Pulled by a sailboat going with the wind and tide, the trawl raked the seafloor and scared flatfishes like flounder, halibut, and sole into the net.
The first mention of a bottom trawl in historic literature, dug up by Callum Roberts for his definitive history of fishing impacts on the oceans, The Unnatural History of the Sea, was prescient: It was a complaint. In 1376, English fishers wrote to King Edward III to request his intervention in the use of the "wondyrechaun," a weighted net dragged along the seafloor to snatch up anything in its path.
And that the great and long iron of the wondryechaun runs so heavily and hardly over the ground when fishing that it destroys the flowers of the land below water there, and also the spat of oysters, mussels and other fish upon which the great fish are accustomed to be fed and nourished. By which instrument in many places, the fishermen take such quantity of small fish that they do not know what to do with them; and that they feed and fat their pigs with them, to the great damage of the commons of the realm and the destruction of the fisheries, and they pray for a remedy.
The bottom trawl was so unpopular among hook-and-line fishers in Europe that they succeeded in staving off the new and damaging technology for centuries. Its use was banned in several countries and even made a capital offense in France in the 16th century. But as Roberts theorizes in his book, there may have been another reason why the trawl didn't catch on: It caught such volumes of fish--sometimes making the net so heavy it could not be hauled up onto the boat--that the fishers couldn't sell the catch before it spoiled. It wasn't until the advent of railroads and the widespread exportation of ice from Northern Europe that the enormous bounties realized by trawling could actually be utilized. By the 1860s, just 30 years after the world's first steam passenger service started, more than 100,000 pounds of fish were transported by rail in England each year. With a new market of seafood consumers beyond the coasts now reachable, the number of British trawlers increased sixfold in 2 short decades, to more than 800 in the early 1860s.
By the numbers alone, the era when fishermen resisted the advent of the trawl was over. But many still complained that, by ripping up the seafloor and crushing the oyster beds and rocky expanses that were the homes and sources of sustenance for fish, the trawls were killing the goose that laid the golden egg. They clamored so loudly that a royal commission was set up by the British government in 1863 to investigate the complaints. But the commissioners rejected the fishermen's concerns outright, instead claiming--contrary to the facts--that the trawls actually fostered life by furrowing the seabed like a plow turning dirt in a field of wheat.
One of the members of the royal commission was Thomas Henry Huxley. A biologist sporting voluminous sideburns, Huxley had earned prominence as one of the earliest and most vocal supporters of Darwin's views on evolution. But during two royal commission investigations into trawling (the second one undertaken in 1883), Huxley embraced the role of skeptic. He sneered at the fishermen's complaints about dropping catches and dismissed their on-the-water accounts.

Tuesday, May 21, 2013

Pray for the people of Moore, OK




The image above is of the entrance to what's left of the Moore, OK, hospital.

Remember the people Moore, OK, in your prayers.  They certainly need them.  And hope we never have to deal with a tornado of this magnitude.

Lots of good articles along with intense images and video of the massive EF-4 (preliminary) tornado.   Weather Underground's News Page

More good articles, etc.    Accuweather.com's News Page

Thursday, May 16, 2013

Move Over, Captain Kidd...

Who said pirates are a part of history? Well, they're still alive and well in some parts of the world ocean, especially off the coast of Somalia.  The pit of chaos that was once Somalia seems to host roving bands of pirates.  The article below from Scientific American illustrates how merchant ships and human lives are not the only threatened things in the Indian Ocean because of these modern pirates.


A masked Somali pirate stands next to a washed-up pirated vessel in Hobyo, Somalia.
A masked Somali pirate, photographed in September 2012, stands in front of a Taiwanese fishing vessel that had washed ashore after being attacked.
Photograph by Farah Abdi Warsameh, AP
Paul Salopek in Djibouti city
Published April 25, 2013
During 32 years of fieldwork in the deserts of Ethiopia, Tim White, the eminent American paleoanthropologist, has brazened through every conceivable obstacle to his research into human origins.
Flash floods have marooned his vehicles in hip-deep pools of mud. Grazing wars between groups of nomads have blocked access to promising fossil beds. And campfire visits by snakes and tarantulas are so routine they rank as minor nuisances.
Yet nothing has stymied White's pursuit of knowledgeor thwarted his scientific ambitions—like the hard-eyed men in flip-flop sandals who, valuing doubloons above Darwin, set sail hundreds of miles away in skiffs stocked with machine guns and rope ladders: Somali pirates.
"No question, it's been a serious setback," says White, who has waited years, in vain, for a research vessel to drill crucial seabed cores off Somalia that would revolutionize the dating of East Africa's spectacular hominid finds. "Piracy has stopped oceanographic work in the region. There's been no data coming out of this area for years. Zero."
White isn't alone in his frustration.
Scientists from around the globe, specializing in subjects as diverse as plate tectonics, plankton evolution, oceanography, and climate change, are decrying a growing void of research that has spread across hundreds of thousands of square miles of the Indian Ocean near the Horn of Africa—an immense, watery "data hole" swept clean of scientific research by the threat of Somali buccaneering.
Major efforts to study the dynamics of monsoons, predict global warming, or dig into seafloors to reveal humankind's prehistory have been scuttled by the same gangs of freebooters who, over the course of the past decade, have killed dozens of mariners, held thousands more hostage, and, by one World Bank estimate, fleeced the world of $18 billion a year in economic losses.
The cost to science may be less visible to the public. But it won't be borne solely by scholars.
Years of missing weather data off the Horn of Africa, for example, will affect the lives of millions of people. A scarcity of surface wind readings has already created distortions in weather models that forecast the strength, direction, and timing of rains that sustain vast farming belts on surrounding continents.
Shelving a Rosetta Stone
"This problem has been going on a long time and with virtually no public awareness," says Sarah Feakins, a researcher at the University of Southern California whose work on paleoclimates has been hijacked by piracy fears. "All kinds of efforts are made to keep the commercial sea lanes around Somalia open. Nobody talks about the lost science."
Feakins's woes highlight the toll the pirates have exacted, albeit unwittingly, on one earth science practice in particular: seabed core sampling, which involves a miniscule global fleet of expensive research vessels that—because they stay in place to drill—are sitting ducks.
Oceanic sediment cores offer researchers a valuable archive of Earth's climate history. Ancient pollen, plankton, dust, and other clues collected from seafloors provide the bulk of what scientists know about global changes to the planet's ecosystems over time.
In 2011, Feakins devised a novel way of harnessing this technology to test one of the oldest questions of human evolution: Did our ancestors actually climb down from trees because of expanding savannas in Africa?
By poring over cores from the seas off East Africa, she would be able to peel back layers of ancient, windblown carbon isotopes associated with grasslands,settling the debate.
Her idea earned the coveted approval of the Integrated Ocean Drilling Program(IODP), an elite international scientific organization that controls the most advanced drilling platform afloat—the JOIDES Resolution, a gigantic, high-tech oceanographic ship topped with a 200-foot-tall drilling rig.

The drill ship JOIDES RESOLUTION.
The JOIDES Resolution, a high-tech vessel equipped with a 200-foot-tall drilling rig.
Photograph courtesy Arito Sakaguchi, IODP/TAMU

But when the location of her sampling became known—near the Gulf of Aden, the bull's-eye of the Somali pirate's hunting grounds—Feakins's project sank without a bubble.
"I'm using old cores from the 1970s now," she says. "It's all we've got."
The JOIDES Resolution is deployed in the Indian Ocean until 2016. But during the past 18 months the IODP has quietly dry-docked three major projects near Somalia.
One casualty was paleoanthropologist White's dream proposal: drilling into the Indian Ocean seabed for ashes that have wafted down from African volcanoes over the course of millions of years.
The ash, which is precisely datable under the ocean because of continuous layering, would offer a game-changing yardstick for correlating the ages of hominid fossils discovered throughout the Great Rift Valley. In effect, the clearest picture yet of the human family tree would be pulled, shimmering, from the sea.
"Rosetta," White says forlornly, referring to the Rosetta Stone, the crucial artifact that enabled 19th-century scholars to at last decipher Egyptian hieroglyphics.

A fossilized monkey skull
Thousands of fossils, such as this monkey skull, can be dated once drill cores are pulled from the ocean floor.
Photograph by Tim D. White

Gunboat Science
The IODP, which is funded by scientific agencies in the United States, Europe, Japan, China, and India, says it has little maneuvering room when it comes to piracy.
"We have always placed the security and safety of our staff and scientists as a number one priority," says David Divins, an IODP spokesman. "The problem is that there is some potentially pioneering science that will have to wait or find another location."
The lawless waters off Somalia, however, are unique. They offer tantalizingly rich returns on anthropological and climatological research. And even Divins admits that the wait could be long.
Research slots on the JOIDES Resolution—the name is an acronym for Joint Oceanographic Institutions for Deep Earth Sampling—are ferociously competitive and booked years in advance. It could be "at least another five years or so" before the vessel returns to the region, Divins says.
Some beleaguered researchers, meanwhile, have sent out an SOS to the world's navies.
Among the armadas now hunting down Somali speedboats, the Australian Navyhas shown a particular willingness to shoulder scientific work. It has agreed to lower oceanographic instruments from its warships.  (Some of that equipment has been retrieved pocked with bullet holes.)
Armed escorts, however, are another matter.
The only vessels afforded close naval protection are UN World Food Programcargo ships carrying relief supplies to the Horn of Africa.
Governments balk at guarding low-priority research vessels, especially when they resemble oil company drill boats—jackpot targets for pirates. The scientific agencies operating the research ships also pan the idea, saying it would sink their insurance policies.
"When I raised the military question, it caused a firestorm of anger from everybody from the U.S. State Department to the IODP," Feakins says. "I was intimidated into just dropping it."
A Treasure Lost
The irony now is that the pirate scourge appears to have peaked off Somalia.
Statistics compiled by the International Maritime Bureau show that brigands managed to force their way aboard only 14 ships in the region in 2012, down from 31 in 2011 and 49 in 2010.
In ports such as Djibouti city, just north of Somalia, it's easy to see why.
The militarization of the area's waterways, particularly the strategic Bab-el-Mandeb Strait between Africa and Arabia, is virtually complete.
The U.S. and Europe each lead heavily armed task forces that shadow endless convoys of oil tankers and container ships past the wild shores of Somalia. Japanese corvettes sit ready at dock, their engines rumbling. Spanish, German, Turkish, and French soldiers assigned to antipiracy campaigns jam the port's hotel lobbies.
Offshore, merchant ships bob at anchor with razor wire coiled about their rails. Big placards on their hulls warn that lethal force will be used to repel attackers.
How long this martial pressure can be sustained is an open question. But for now the Somalis are outgunned.

A suspected pirate is arrested near Mumbai, India.
A suspected Somali pirate is apprehended near Mumbai, India.
Photograph by Punit Paranjpe, AFP/Getty Images

Still, even if the oceanographic research community steams back into the Gulf of Aden tomorrow, the havoc that pirates have wreaked on science is enduring.
Writing in EOS, the journal of the American Geophysical Union, the meteorologists Shawn R. Smith, Mark A. Bourassa, and Michael Long point out that routine wind readings collected by ships for decades are now interrupted by a colossal blank space that gapes across 960,000 square miles (2.5 million square kilometers) of open sea.
In this case, ship captains have not simply avoided Somalia, but have refused to broadcast anything that might tip off eavesdropping buccaneersincluding daily weather reports. That long radio silence has spawned a historic anomaly, or aberration, in oceanographic records.
"The data void exists in the formation region of the Somali low-level jet, a wind pattern that is one of the main drivers of the Indian summer monsoon," the EOSarticle's authors warn.
One consequence: It has become harder to predict long-term changes in a weather system that disperses rain across immense agricultural zones in Africa, the Middle East, and especially South Asia.
"For people trying to understand the science of climate change and the impact of El Niño on the Asian monsoon, I believe that this has been permanent damage," laments Peter Clift, an earth scientist at Louisiana State University in Baton Rouge.
Clift is being generous.
His own research, which explores how the Earth's geology and atmosphere interact, has been held hostage for more than a decade by the marauders off the African Horn.
He needs a drilling ship. None will come. And he says he may never complete his life's work: yet more booty stolen by the pirates of Somalia.
From 2013 to 2020, writer Paul Salopek is recreating the epic journey of our ancestors on foot, starting at humankind’s birthplace in Ethiopia and ending at the southern tip of South America, where our forebears ran out of horizon. Along the way he is engaging with the major stories of our time—from climate change to technological innovation, from mass migration to cultural survival. Moving at the slow beat of his footsteps, Paul is also seeking the quieter, hidden stories of people who rarely make the news. To read Paul Salopek's latest dispatch, go to:outofedenwalk.nationalgeographic.com

Saturday, May 11, 2013

Chemical Buffering of Seawater (aka...alkalinity)

Earlier this year we learned about chemical buffering in the ocean along with alkalinity.  We also learned about the importance of restoring oyster reefs in the Chesapeake Bay.  The article below discusses the delicate balance involved.  (article credit - ScienceDaily.com)


nder-Appreciated Benefit of Oyster Restoration Highlighted

May 9, 2013 — Scientists have identified many benefits for restoring oyster reefs to Chesapeake Bay and other coastal ecosystems. Oysters filter and clean the water, provide habitat for their own young and for other species, and sustain both watermen and seafood lovers.

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A new study co-authored by Professor Roger Mann of the Virginia Institute of Marine Science adds another item to this list of benefits -- the ability of oyster reefs to buffer the increasing acidity of ocean waters.
The study, "Ecosystem effects of shell aggregations and cycling in coastal waters: An example of Chesapeake Bay oyster reefs," appears in Ecology, the flagship journal of the Ecological Society of America. It is co-authored by George Waldbusser of Oregon State University and Eric Powell of the Haskin Shellfish Research Laboratory at Rutgers University.
Concerns about increasing acidity in Chesapeake Bay and the global ocean stem from human inputs of carbon dioxide to seawater -- either through the burning of fossil fuels or runoff of excess nutrients from land. The latter over-fertilizes marine plants and ultimately leads to increased respiration by plankton-filtering oysters and bacteria. In either case, adding carbon dioxide to water produces carbonic acid, a process that has increased ocean acidity by more than 30% since the start of the Industrial Revolution.
A more acidic ocean concerns marine-life experts, who cite its corrosive effects on the calcium carbonate shells of oysters, clams, and other mollusks, as well as its possible physiological effects on the larvae of fish and other marine creatures. At current rates of increase, ocean acidity is predicted to double by 2100.
The Ecology paper reports on the research team's efforts to calculate past and present shell budgets for Chesapeake Bay, with a goal of estimating how effective healthy oyster reefs might be in moderating ocean acidity, and whether today's depleted reefs can withstand future acidity increases.
"Oyster shells are like slow-dissolving TUMS in the belly of Chesapeake Bay," explains Mann. "As ocean water becomes more acidic, oyster shells begin to dissolve into the water, slowly releasing their calcium carbonate -- an alkaline salt that buffers against acidity. An oyster reef is a reservoir of alkalinity waiting to happen."
The team's calculations suggest that in 1870 -- before people began large-scale harvesting of oyster meat and shells from the Chesapeake -- the amount of oyster shell exposed to Bay waters was more than 100 times greater than today, with an equally enhanced capacity to buffer acidity.
"Our data show that that oyster reefs likely played a key role in the pH budget of pre-harvest Chesapeake Bay," says Mann. "The amount of carbonate in the shells of living oysters at that time was roughly equal to the total amount of carbonate dissolved in the modern Bay. If similar numbers of oysters were alive today, they could take up about half of the carbonate that rivers currently carry into Bay waters."
Many people are familiar with the notion that the cloudy waters of the modern Bay would be clearer if over-harvesting and disease hadn't drastically reduced the oyster population and its capacity to filter particles from the water. Mann says, "Our study suggests a similar loss of ecosystem function, but in terms of buffering acidity rather than improving water clarity. This has significant ecological ramifications, but hasn't really been on anyone's radar screen."
Returning oyster shells to Bay waters -- a practice that began in earnest in the 1960s to restore reefs for food and filtering -- has helped buffer acidity in the Bay, but to nowhere near historical levels. Today, scientists estimate that the Bay loses 100 million bushels of oyster shell each year to harvesting and corrosion in Maryland waters alone, despite the return of 20-30 million bushels of shell through dredging and restaurant recycling.
The study by Mann and his colleagues estimates that oysters now contribute only 4% to buffering of acidity baywide, whereas they were responsible for 70% of all baywide buffering in 1870.
Looking towards the future, the team's concern is that oyster reefs in the modern Bay -- fewer and smaller than their pre-harvest counterparts and featuring smaller oysters -- may be unable to keep pace with the increasing acidity of Bay waters.
"The shells of dead oysters degrade rapidly in estuarine environments," says Mann, "with a half-life of only 3 to 10 years. For a reef to maintain the structure needed to support future generations, oysters must grow fast enough and large enough so that their rate of shell production exceeds that of shell degradation."
The optimal rate of shell addition, says Mann, "occurs with larger, older animals that contribute more shell carbonate per mortality event." But, he adds, "the onset of disease has unfortunately reduced the life span and maximum size of Bay oysters, thus compromising the shell budget."
"What's worrisome about this is that the shell reservoir is getting smaller and smaller," says Mann. "Could we reach a tipping point where increasing acidity so overwhelms the decreased buffering capacity of dead shells that it then begins to significantly affect live oysters, further limiting their ability to add shell to the alkalinity buffer? If so, we could end up with a negative feedback loop and a worst-case scenario."
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Story Source:
The above story is reprinted from materials provided byVirginia Institute of Marine Science. The original article was written by David Malmquist.
Note: Materials may be edited for content and length. For further information, please contact the source cited above.

Journal Reference:
  1. George G. Waldbusser, Eric N. Powell, Roger Mann.Ecosystem effects of shell aggregations and cycling in coastal waters: an example of Chesapeake Bay oyster reefsEcology, 2013; 94 (4): 895 DOI: 10.1890/12-1179.1
 APA

 MLA
Virginia Institute of Marine Science (2013, May 9). Under-appreciated benefit of oyster restoration highlighted. ScienceDaily. Retrieved May 11, 2013, from http://www.sciencedaily.com­/releases/2013/05/130509154600.htm
Note: If no author is given, the source is cited instead.

Saturday, May 4, 2013

Watch Out for the Cnidarians!


Boom in Jellyfish: Overfishing Called Into Question

May 3, 2013 — Will we soon be forced to eat jellyfish? Since the beginning of the 2000s, these gelatinous creatures have invaded many of the world's seas, like the Japan Sea, the Black Sea, the Mediterranean Sea, etc. Is it a cyclic phenomenon, caused by changes in marine currents or even global warming? Until now, the causes remained unknown. A new study conducted by IRD researchers and its partners, published in Bulletin of Marine Science, exposes overfishing as the main factor.
Jellyfish have free rein
Jellyfish predators, such as tuna and sea turtles, are disappearing due to overfishing. However, jellyfish are primarily taking advantage of the overfishing of small pelagic fish. Just like these cnidarians, sardines, herring, anchovies and more feed off zooplankton. Thus, they represent their main competition for food. In areas where too many of these fish are caught, they free up an ecological niche. Jellyfish now have free rein and can thrive. Furthermore, small fish eat the eggs and larvae of jellyfish. Therefore, under normal conditions, they regulate the population. In their absence, there is nothing to stop the proliferation of these gelatinous creatures.
Comparison as proof
In order to demonstrate the major role played by overfishing, researchers compared two ecosystems belonging to the same ocean current, the Benguela, which flows along the south of Africa. The first ecosystem is located off the coast of Namibia. Here, fish stock management measures are not very restrictive. The stocks are barely restored before fishing activities start up again. Jellyfish are currently colonising these coastal waters. The second ecosystem is located 1,000 km further south, off the coast of South Africa. Here, the opposite is true: fishing has been tightly controlled for 60 years. The jellyfish population has not increased.
Fisheries suffer the effects
A vicious circle is developing in affected areas. Under the water, the links in the food chain are much more flexible than on Earth: prey species can feed off their predators. As such, jellyfish devour larval fish. Their proliferation prevents the renewal of fishery resources. This invasive species in turn threatens fisheries. In Namibia, some 10 million tonnes of sardines in the 1960s made way for 12 million tonnes of jellyfish.
Jellyfish are the pet peeve of tourists. The sting of their poisonous filaments -- although seldom deadly -- is very urticant. Therefore, they put economic activities in many regions across the world at risk. This is particularly true in countries which depend on these resources, such as several developing countries.
This research work underlines the necessity of an ecosystemic approach towards the exploitation of the sea. In other words, the implementation of management measures which take into account all levels of the trophic network. According to scientists, this is the only way to prevent jellyfish from landing on our plates in the near future.
Did you know?
Jellyfish are made up of 98% water. They have neither a brain, nor a heart or teeth… And yet, they are fierce predators! They immobilise their prey with their poisonous tentacles.
The boom in jellyfish is observed across the entire planet. To date, however, there is no hard data on the increase in their global population.
There are hundreds of species of jellyfish which come in a great variety of colours, shapes and sizes, ranging from a few millimetres to several metres in diameter. The majority of them are carnivorous.
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Story Source:
The above story is reprinted from materials provided byInstitut de Recherche pour le Développement (IRD).
Note: Materials may be edited for content and length. For further information, please contact the source cited above.

Journal Reference:
  1. Jean-Paul Roux, Carl D van der Lingen, Mark J Gibbons, Nadine E Moroff, Lynne J Shannon, Anthony DM Smith, Philippe M Cury. Jellyfication of Marine Ecosystems as a Likely Consequence of Overfishing Small Pelagic Fishes: Lessons from the BenguelaBulletin of Marine Science, 2013; 89 (1): 249 DOI: 10.5343/bms.2011.1145
 APA

 MLA
Institut de Recherche pour le Développement (IRD) (1969, December 31). Boom in jellyfish: Overfishing called into question. ScienceDaily. Retrieved May 4, 2013, from http://www.sciencedaily.com­/releases/2013/05/130503094700.htm
Note: If no author is given, the source is cited instead.
Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.