Sunday, September 30, 2012

Unknown coral hotspots discovered off US East Coast

From MSNBC:  Unknown coral hotspots discovered off US East Coast

A survey of underwater canyons off the U.S. East Coast found a number of previously unknown hotspots for deep-sea corals. 

The exploration, the first to look for corals and sponges in the area in decades, is helping researchers develop a computer model to determine where other coral hotspots might be found.

The survey took place over a two-week stretch in July. Researchers aboard the National Oceanographic and Atmospheric Administration's Henry B. Bigelow ship looked for corals in submarine canyons off New Jersey, and connected to Georges Bank, a large elevated area of seafloor about 60 miles (100 kilometers) offshore that stretches as far south as Cape Cod, Mass., and north to Nova Scotia.
Nizinski et al, NOAA / NMFS / NEFSC / WHOI
 
Deep-sea corals (possibly Paramuricea) in Gilbert Canyon, off New Jersey, at about 5,535 feet (1687 meters) deep. 
 
"The deep-sea coral and sponge habitats observed in the canyons are not like those found in shallow-water tropical reefs or deep-sea coral habitats in other regions," said Martha Nizinski, chief scientist of the research cruise, in a statement.  "We know very little about the distribution and ecology of corals in the canyons off the Northeast coast. Although our explorations have just begun, we've already increased our knowledge about these deepwater coral habitats a hundred times over."

The researchers took thousands of photographs of the coral using a remotely operated camera towed behind the ship. The corals observed live at depths between 650 and 6,500 feet (200 to 2,000 meters). Although no specimens were collected during this expedition, the thousands of images taken will be analyzed in the coming months to determine what types of coral live there.

More than 70 deepwater canyons, ranging in depth from 330 to 11,500 feet (100 to 3,500 m), exist along the Northeast's continental shelf and slope. Few are well studied, and many are likely home to as yet undiscovered life-forms. 


 

 

Friday, September 28, 2012

Alaska and the mysterious disappearing king salmon

From BBC Magazine:  Alaska and the mysterious disappearing king salmon

When the number of king salmon running in Crooked Creek's river declined dramatically, the mostly native Alaskan villagers were left wondering where they could find enough food to last the winter.
Crooked Creek has no big-box grocery stores or roads to other towns. But in good times, the Kuskokwim River promises king salmon to the villages along its 702 miles (1,130km).
But good times are fading into memory for villagers like Evelyn Thomas, who has lived in Crooked Creek her entire life.
"In my language, fish is called 'the food'," says Thomas, a half Yupik, half Athabascan native Alaskan who says she has little money to buy food to replace the salmon.
"When we don't get 'the food', a staple of our diet is missing."
Over the past five years, Alaska's king salmon have begun to disappear from the state's rivers, and no-one is sure why.
This summer's king salmon season yielded one of the lowest catches on record. The drop has devastated commerce and tourism, but the most dramatic effect has been on subsistence villages where fishermen eat what they catch.
In an emergency effort to ensure the future survival of the king salmon, state officials have severely limited the catch this year, even going so far as to close some rivers entirely to fishermen.
Fishermen accused of breaking the limit have been prosecuted, their catch confiscated.
"Many people don't know how they're going to feed their families throughout the winter," says Thomas. "There is no economy here, there is no money."
Crooked Creek is part of one of the poorest regions in the US, the Yukon-Kuskokwim delta in Alaska's south-west.
The delta's rural villages suffer from chronic unemployment and some of the highest poverty rates in the country - up to 31%, compared to 15% nationwide.
A king salmon King salmon is also known as chinook salmon
The cost of living there is exorbitant, because the area has few roads. Petrol and other supplies must be imported by barge or plane.
But one king salmon can feed an entire family for a week.
The fish ranges from a glittering silver in colour to a bold red, but its most distinctive trait is its size. Fishermen in villages like Crooked Creek wade in the Kuskokwim River to catch king salmon in their nets.
They hang their catch on racks to dry and preserve it for the winter. Families can the salmon and make smoked boiled salmon during the winter. Or they freeze the salmon and fry or bake it.
The salmon's rich flavour and oil nourish families through the long, dark winter.
But this year, the delta's fishermen hauled in less than a quarter of the usual harvest of 80,000 king salmon, according to the Association of Village Council Presidents.
"Many people in the villages will have to choose between food and fuel this winter," says Myron Naneng Sr, president of the association.
The reason for the drop remains unclear, says Pat Shields, a biologist with the Alaska Department of Fish and Game.
"There's a concern about kings in Alaska right now - very few rivers have achieved king spawning escapement goals," he says.
"We're in the third, fourth, fifth year of this now - what's happening? We have made our spawning goals in systems and we're not getting the adults back."
Since most of Alaska's prime salmon rivers have suffered large declines, scientists are searching further downstream, in the ocean for clues. Researchers have no sense of when - if ever - the salmon will recover.
Alaska's economic vitality is tied to the health of its king salmon, and anxiety over the fish's fate is felt particularly strongly on the Kenai Peninsula.
The Kenai River's turquoise waters thread past the small fishing towns of Soldotna and Kenai, which are normally packed with tourists during the summer months.
So in July, when authorities closed the Kenai River to sport king-fishing for the first time in the state's history, the economic impact was devastating.
"In the last three or four years, Alaska's tourism industry has felt the economic downturn just like any other region in the country and world," says Ricky Gease, executive director of the Kenai River Sportfishing Association.
"Many businesses here have gone through their savings, and it's getting to the point where an event like this is the last straw that breaks the camel's back."
Even commercial fisherman hunting other species have been sidelined this summer.
The state restricted commercial fishing of sockeye salmon, a different species, in the Cook Inlet in order to minimise the number of king salmon netted inadvertently.
"You got one of the longest in-place sustained fisheries in the state [that's] being threatened," says Gene Palm, a commercial fisherman.
"Our future is tenuous to say the least."
The restrictions have escalated long-held tensions among the many groups reliant on king salmon.
Native Alaskan subsistence communities feel they have unfairly borne the burden, compared to the large commercial fisheries.
"We're not allowed to practise the human right to feed our families," says Thomas. "Close all commercial fishing [and] people will holler and scream. But we don't make any money on anything - we use it to eat. And we've been hit the hardest."
Officials estimate the loss to the state from this summer's weak catch could exceed $10m (£6m), and the US government hopes to offer financial assistance to subsistence villagers and commercial fishermen alike.
But with fresh snow already falling on the mountains ringing Crooked Creek, Thomas isn't waiting on government assistance: she has applied for a moose-hunting permit and is gathering berries.
"My parents, when I was small, used to tell me, 'It's easier to lose a little sleep now in the summer months when the food is here, than it is to feel the pinch of hunger in April and May,'" Thomas says.
"Looking back on it, they were absolutely right. This year is going to be pretty tough."



Thursday, September 27, 2012

2 men found with 332 illegal lobsters Read more here: http://www.miamiherald.com/2012/09/19/3010752/2-men-found-with-332-illegal-lobsters.html#storylink=cpy

From the Miami Herald:  2 men found with 332 illegal lobsters

Homestead resident Ernesto Rua and Marathon resident Raudel Rubio got carried away on an early-morning lobster hunt last weekend — exceeding their legal limit of 12 total tails (six per person) by 320, authorities say.
Turns out that 304 of the spiny lobster tails were also under the legal size limit, which according to the Florida Fish and Wildlife Conservation Commission is the three-inch carapace when measured in the water.
The two men were arrested Sunday after bringing the lobster ashore near mile marker 54 and being searched by Monroe County Sheriff's Office Deputy Wilfredo Guerra.
They were each charged with possession of 332 wrung lobster tails (tails can't be wrung on the water) and possession of 304 undersized lobster tails.
According to Guerra's report, he saw Rua, 41, and Rubio, 26, coming ashore near the former Quay restaurant property around 4:10 a.m. Sunday. Their vessel had no lights on.
The report says once docked, Guerra saw Rua and Rubio carrying a gray plastic container toward a black SUV in the parking lot. Guerra approached the two men and asked to inspect the container.
The report says both men admitted to possessing all the tails; they were arrested. Rua and Rubio were jailed on $150,000 bond.
The lobster tails were turned over to the Florida Fish and Wildlife Conservation Commission to be kept in the agency's evidence facility.

Read more here: http://www.miamiherald.com/2012/09/19/3010752/2-men-found-with-332-illegal-lobsters.html#storylink=cpy


Read more here: http://www.miamiherald.com/2012/09/19/3010752/2-men-found-with-332-illegal-lobsters.html#storylink=cpy

Wednesday, September 26, 2012

Donsol has most whale sharks in PH

From ABC-CNBC News:  Donsol has most whale sharks in PH

MANILA, Philippines -- If you want to spot a whale shark, more commonly known as butanding among Filipinos, Donsol in Sorsogon is still the best place to visit.
According to the World Wildlife Fund (WWF), Donsol hosts the most whale sharks in the Philippines with at least 377 identified by the group -- more than any other area in the country.
In a statement released on Wednesday, WWF-Philippines said it has identified 458 individual whale sharks in the country since 2007, with 377 of them found in Donsol.
Cebu was a far second with 54 butandings identified, 14 in Leyte and the rest in Bohol, Palawan, Albay and Batangas.
With the support of WWF-Denmark, WWF-Philippines teamed up with Australia-based ECOCEAN, the Hubbs Sea World Research Institute and Banco de Oro Unibank to catalogue the country’s whale sharks. The partnership provides researchers with both population pegs and migratory data to guide conservation efforts not just for whale sharks – but for all migratory pelagic species.
Sporting waterproof digital cameras, trained WWF skin divers snap photos of a spot right above each shark’s pectoral fins, behind its gill slits. The photos are fed into a computer which uses a program to triangulate each shark’s unique spot configuration. The data is then uploaded to the web-based ECOCEAN library.
Unless it is a new individual, the library shows researchers when and where the shark was last encountered. Since 2003, ECOCEAN has catalogued 3,822 individual sharks from places as far as Mexico, Mozambique and the Galapagos Islands.
“Photo-identification is a non-invasive approach for identifying sharks,” said Dave David, a whale shark researcher at WWF-Philippines. “The library uses the whale shark’s distinct patterns, plus information on scars, sex and size to identify individuals.”
To complement the photo-identification drive, 29 whale sharks were also affixed with detachable GPS satellite tags designed to pop to the surface after several months of data collation. Four sharks were tagged in May 2007, 10 more in May 2009 and 15 in April 2010, according to the WWF.
"The results suggest that most tagged whale sharks keep to 200 kilometers of Donsol. Three however, swam east to the Philippine Sea, with one more swimming as far north as Taiwan. All spent most of their time below 50 meters, rarely rising to the surface to feed," the group said in the statement.
David said the results suggest that whale sharks are "highly mobile, transient foragers which recognize no country or territorial boundary as their own."
"The distribution of whale sharks and other large filter-feeders also indicate the presence of plankton and the overall health of our oceans,” he added.
For years, Donsol has been identified as a whale shark hotspot, hosting one of the largest aggregations of whale sharks on Earth.
Other large aggregations include Ningaloo Reef in Australia with 808, Mexico with 812 and Mozambique with 624.
Through continued research, David and other WWF volunteers hope to generate an accurate peg of the country’s migratory and resident whale shark population.
“Long days at sea are worth it, considering the immense scientific, ecological and economic value that whale sharks bring people,” David said.
“Even after years of research, there’s still so much we have to discover – where they feed, mate and give birth. Our work continues, which is just as well because diving with these gentle giants is pure magic.”

 

Tuesday, September 25, 2012

Researchers Confirm Overgrown Algae Causing Coral Reef Declines

From Underwater Times: Researchers Confirm Overgrown Algae Causing Coral Reef Declines

CORVALLIS, Oregon -- Researchers at Oregon State University for the first time have confirmed some of the mechanisms by which overfishing and nitrate pollution can help destroy coral reefs – it appears they allow an overgrowth of algae that can bring with it unwanted pathogens, choke off oxygen and disrupt helpful bacteria.
These "macroalgae," or large algal species, are big enough to essentially smother corals. They can get out of control when sewage increases nitrate levels, feeds the algae, and some of the large fish that are most effective at reducing the algal buildup are removed by fishing.

Scientists found that macroalgal competition decreased coral growth rates by about 37 percent and had other detrimental effects. Other research has documented some persistent states of hypoxia.
Researchers call this process "the slippery slope to slime."
Findings on the research were just published in PLoS One, a professional journal. The work was supported by the National Science Foundation.
"There is evidence that coral reefs around the world are becoming more and more dominated by algae," said Rebecca Vega-Thurber, an OSU assistant professor of microbiology. "Some reefs are literally covered up in green slime, and we wanted to determine more precisely how this can affect coral health."
The new study found that higher levels of algae cause both a decrease in coral growth rate and an altered bacterial community. The algae can introduce some detrimental pathogens to the coral and at the same time reduce levels of helpful bacteria. The useful bacteria are needed to feed the corals in a symbiotic relationship, and also produce antibiotics that can help protect the corals from other pathogens.
One algae in particular, Sargassum, was found to vector, or introduce a microbe to corals, a direct mechanism that might allow introduction of foreign pathogens.
There are thousands of species of algae, and coral reefs have evolved with them in a relationship that often benefits the entire tropical marine ecosystem. When in balance, some algae grow on the reefs, providing food to both small and large fish that nibble at the algal growth. But the algal growth is normally limited by the availability of certain nutrients, especially nitrogen and phosphorus, and some large fish such as parrot fish help eat substantial amounts of algae and keep it under control.
All of those processes can be disrupted when algal growth is significantly increased by the nutrients and pollution from coastal waste water, and overfishing reduces algae consumption at the same time.
"This shows that some human actions, such as terrestrial pollution or overfishing, can affect everything in marine ecosystems right down to the microbes found on corals," Vega-Thurber said. "We've suspected before that increased algal growth can bring new diseases to corals, and now for the first time have demonstrated in experiments these shifts in microbial communities."
Some mitigation of the problem is already being done on high-value coral reefs by mechanically removing algae, Vega-Thurber said, but the best long-term solution is to reduce pollution and overfishing so that a natural balance can restore itself.
Corals are one of Earth's oldest animal life forms, evolving around 500 million years ago. They host thousands of species of fish and other animals, are a major component of marine biodiversity in the tropics, and are now in decline around the world. Reefs in the Caribbean Sea have declined more than 80 percent in recent decades.

Monday, September 24, 2012

It's all there in black and white: Sharks are indeed color blind

From NBC News:  It's all there in black and white: Sharks are indeed color blind

Sharks are color blind, new research suggests, with the toothy predators likely forever seeing the world in black and white.
The study, published in the latest Royal Society Biology Letters, is the first to investigate the genetic basis and spectral tuning of the shark visual system.
The ramifications could be huge, helping to save both sharks and people.
"The work will have a major influence on human interactions with sharks," co-author Nathan Hart, a research associate professor at the University of Western Australia's School of Animal Biology and The Oceans Institute, told Discovery News.
"Firstly, this knowledge may enable us to design fishing gear that is more specific for target fish species and thus reduces unnecessary bycatch of sharks," Hart continued. "Secondly, it may help us to design equipment that is less attractive to sharks (wetsuits and surfboards, for example) that may help to reduce attacks on humans."
Building on a study from last year, Hart and his colleagues isolated and sequenced genes encoding shark photopigments involved in vision. Photopigments are light-sensitive molecules. Through a biochemical process, they signal this detection of light to the rest of the visual system.
Photopigments are found in two places: rods and cones. The former type is more sensitive and is generally used under very dim light. The latter type is smaller and less sensitive, but is faster responding, applying more to brighter-light conditions.
The researchers determined that the studied sharks, in this case two wobbegong species, are cone monochromats. This means that the sharks only had one type of cone and one type of rod gene, supporting that they are color-blind. The findings strengthen earlier speculation about not only wobbegongs, but other shark species.
Sharks belong to a cartilaginous fish group that also includes skates and rays. Prior research indicates that skates have "no color vision at all," Hart noted. "Rays have more than one photopigment and so they have the retinal 'machinery' for color vision," he added. "Recent behavioral tests in my lab have also demonstrated that they have functional color vision." 
Sharks are probably not the only large water dwellers that are color-blind. Other research indicates that marine mammals, such as whales, dolphins and seals, cannot detect colors either.
"It may be that color is not useful to them, or that they have lost the pigments for another reason," said Hart.
"It is likely that the ancestors of modern sharks could see in color," he added, so sharks and all of these animals may have once seen in color.
Genetic studies even suggest that the ancestors of humans and other terrestrial mammals lost some color sensitivity over the course of their evolution.
Sharks and marine mammals are far from being the most visually challenged aquatic animals.
Recently, scientists studied two groups of blind cave fishes that are eyeless. Prosanta Chakrabarty, an assistant professor and curator of fishes at Louisiana State University's Museum of Natural Science, and colleagues found that such fishes from Madagascar and Australia are related. Life in a dark cave doesn't require color detection or even vision, so the fishes have survived by using their other senses.
Color must also not be critical to shark survival.
"Color as we think of it may be unimportant to sharks, and they are only interested in achromatic contrast differences, just as if we were watching something on a black and white TV set," Hart said.



 

Wednesday, September 19, 2012

Posts resume Monday Sep 24 2012

I have to take my mom up to visit her elder sister in Box Elder which is near Rapid City. They have no internet up there.

Posts resume 24 Sep 2012.

Thanks for your patience!

Read more here: