The shipworm Teredo navalis is spreading to the Baltic Sea, threatening to destroy archaeological artefacts. Researchers* at Gothenburg University suspect that climate change is what’s making it possible for this species to spread and are now joining the EU project WreckProtect, a cooperative effort to assess which archaeological treasures are at risk. The project includes researchers from Sweden, Denmark and the Netherlands, as well as experts from France and Germany.

Not really a worm
Shipworms are not actually worms but saltwater clams with much reduced shells. They are notorious for borrowing into and gradually destroying wooden structures in saltwater; earning the nickname “termites of the sea”.

There are 65 different know species of shipworm but Teredo navalis is the only one currently known to spread into the Baltic Sea via the Great Belt. Teredo navalis forms up to 30 cm deep tunnels in submerged wood and is difficult to detect since it remains hidden inside the tunnel. It has a life expectancy of 3-4 years.

Teredo navalis can survive in a salinity of 4-6 practical salinity unit (PSU) for short periods of time but can not reproduce unless the salinity is at least 8 PSU. The salinity of the Baltic Sea decrease the further north you get with the Stockholm Archipelago sporting an average salinity of roughly 5 PSU.

The shipworm is capable of completely destroying large maritime archaeological finds in only 10 years, and while it has avoided the Baltic Sea in the past, since it does not do well in low salinity water, it can now be spotted along both the Danish and German Baltic Sea coasts.

14th century shipwrecks under attack

“Wrecks that have been resting unharmed since the 14th century have now been attacked off the coast of Rügen in Germany, and we are also noticing attacks along the Swedish coast, including destruction of the Ribersborg cold bath house in Malmö,” says Christin Appelqvist, doctoral student at the Department of Marine Ecology, University of Gothenburg.

Appelqvist and her colleagues suspect that increased water temperatures may be helping the shipworm to tolerate a lower salinity.

One of the objectives of project WreckProtect is to develop methods for the preservation and protection of shipwrecks. It might for instance be possible to cover the wrecks with geotextile and bottom sediment.

100,000 wrecks may be at risk
Thanks to the absence of Teredo navalis there is currently around 100,000 well preserved shipwrecks resting in the Baltic Sea, a true treasure for historians and archaeologists. If the shipworm continues to spread these ships may vanish before anyone has a chance to explore them.

“Around 100 wrecks are already infested in the Southern Baltic, but yet it hasn’t even spread past Falsterbo. We know it can survive the salinity of the Stockholm archipelago, although it needs water with higher salinity than that to be able to reproduce,” says Appelqvist.

* Christin Appelqvist, Department of Marine Ecology, University of Gothenburg
http://www.marecol.gu.se/Personal/Christin_Appelqvist/

* Jon Havenhand, Department of Marine Ecology, University of Gothenburg
http://www.tmbl.gu.se/staff/JonHavenhand.html

Picture credit: http://www.science.gu.se

Throughout December, hundreds of sea lions vanished from the San Francisco bay area only to show up later in the Oregon Sea Lion Caves. The Oregon Sea Lion Caves are a connected system of sea caves and caverns located along the Pacific coast of Oregon and a popular hangout for sea birds such as the tufted puffin, pigeon guillemot, Brandt’s cormorant, and various types of gulls. The caves are also an important wintering home for the Stellar Sea Lion and – to a lesser extent –the California Sea Lion.

“We’re seeing the sea lions coming up this way from California because of the feeding. If the cold water fish move north to find colder waters, the sea lions have to eat and they follow the fish wherever they go,” says Sea Lion Caves General Manager Dan Harkins.

So, how can the cave staff know for sure who’s a visitor from California and who isn’t? Apparently, sea lions have dialects; just like us humans.

“We can identify them by the sound of their voice. They have a barking noise rather than a grumbling or a growling that Stellers do,” says Harkins.

The Sea Lion Caves were first explored in 1880 by local resident Captain William Cox. On a calm day, the captain entered the grotto through the western channel in his small boat. During a later expedition he was reportedly marooned due to stormy weather and had to survive by shooting a sea lion and eating its flippers. In 1887 Captain Cox purchased the land from the State of Oregon and the cave system has been privately owned and managed ever since.

Scuba divers are threatening the survival of the infinitesimal Pygmy seahorses found on the coral reefs around Sabah’s east coast islands in Malaysia.

Sabah, a Malaysian state situated in the northern part of the island of Borneo, is home to two species of pygmy seahorse Hippocampus bargibanti and Hippocampus denise. Both species are fairly widespread in South East Asia and are found on coral slopes from southern Japan and Indonesia to northern Australia and New Caledonia.

Barely five years ago, the pygmy seahorses were discovered at popular Sabah divespots, such as Bodgaya, Mabul and Pulau Sipadan, and since then dive operators have brought large numbers of scuba divers to see the tiny creatures. In some of the most popular spots, over 100 divers can be seen exploring the reef simultaneously and this puts a lot of stress on the reef and its inhabitants.

Photographing divers have for instance been spotted breaking off sea fans – the natural habitat of the pygmy seahorses – and moved them just to get a better angle for their pictures.

In an effort to improve the conditions for the seahorses, marine biologist Yeong Yee Ling of the Universiti Malaysia Terengganu has held a two-day seminar about how to behave when scuba diving in seahorse habitat. The seminar was attended by 57 participants, including representatives from most of the 15 dive operators based in Semporna. Sabah Parks, the conservation-based statutory responsible for conserving the scenic, scientific and historic heritage of the state of Sabah, was also involved in the event.

“Our hope is that the discussions from the seminar would eventually be synthesised into a code of conduct for divers. We are thankful the dive operators have been supportive of this effort,” said Yeong, who has been researching pygmy seahorses for the past three years.

The seminar was funded by the Shell Malaysia’s Sustainable and Development Grant.

A rigid inflatable boat capable of submerging and operating underwater has been developed by Severn (7) Shipbuilders in Gloucestershire, UK.

The boat is intended for carrying workers and equipment to underwater structures in need of repair or maintenance work, such as oil rigs and bridge structures. Since it is capable of travelling on water as well as submerged, the vessel can quickly travel to the right location on the surface before submerging down to the desired depth.

The vessel consists of outer and inner tubes, plus an underneath compartment that holds the main fuel tank and lightweight batteries. The underneath compartment can be flooded to aid submerging and keep the vessel stable underwater. The outer tubes will normally be open, but can be closed if necessary. The inner tubes are inflatable and will be used to provide positive buoyancy when its time to resurface.

Europe‘s first artificial surf reef was officially launched this Monday. Around a dozen surfers and body boarders headed for the waves as soon as the Bournemouth Borough Council declared the reef open.

As reported earlier, the artificial reef – which is located in Boscom on UK’s South Coast – consists of big geo-textile bags pumped hard with sand and aids in the formation of powerful barrel waves by pushing the naturally occurring waves upwards.

Prior to the opening, surfers had expressed fears that the reef was too big, situated the wrong way around, located on the wrong side of the pier, and potentially dangerous, so many eyes are now carefully monitoring the project to see if it’s a flip or flop.

“We have now got to give it the chance to see if it [the reef] does perform against the criteria that we have agreed with them,” says Roger Brown, the council’s director of leisure services.

Sean Wade, from Sorted surf shop, said: “Longer term it will need tweaking but with any project it is finding out how it works and what the best conditions are. Yesterday it looked pretty amazing.”

The artificial reef is part of the £8 million Boscombe Spa Regeneration Project funded through the sale of a seafront car park to a company that will use the space to build flats. On days with good swell, the new reef is expected to provide grade five waves.

In most species, a male specimen will usually don’t invest a lot of time or energy in caring for young when there is a good chance that he is not their father. There are how ever exceptions to this rule, such as the Ocellated wrasse.

Yale University researchers studying the breeding behaviour of this Mediterranean fish have found that a male Ocellated wrasse is more likely to care for the offspring when there is grave doubt about who actually fathered them.

The study also showed that female Ocellated wrasse will deposit more eggs in a nest where the nesting male is surrounded by non-nesting “sneaker males”; males who are keen to fertilize the eggs but have no plans ever caring for the offspring. Females will also deposit more eggs in nests where there are already large numbers of offspring.

“Parental male oscellated wrasse are more likely to care for offspring in this sperm-filled  environment than in nests in which there is less sexual competition”, said Suzanne H. Alonzo, assistant professor of ecology and evolutionary biology and co-author of the study.

Even though the caring male has a greater chance of ending up taking care of someone else’s offspring if he allow other males to hang around, he still benefits from having a lot of “sneaker males” near his nest since it will make the females deposit more eggs.

“While our simpler theories have trouble explaining the diversity of what we observe in nature, these patterns do have explanations,” Alonzo said. “The paper suggests we may have oversimplified the evolutionary dynamics of how these things work.”

The paper has been published in the edition of the journal Proceedings of the Royal Society of London. The study was carried out by Suzanne H. Alonzo, assistant professor of ecology and evolutionary biology and Kellie L. Heckman, a postdoctoral fellow in the department.

The Jordanian government has announced its plans to extract over 10 billion cubic feet of water per year from the Red Sea and send most of it to a desalination plant to produce drinking water. The salty wastewater will then be sent from the desalination plant to the Dead Sea by tunnel. Jordanian Water Minister Maysoun Zu’bi says the project will begin as soon as funding has been arranged.

Environmentalists warn that the endeavour could damage the ecosystem of both seas. Mixing two types of saltwater could produce algae blooms in the Dead Sea, and some environmentalists also fear that the extraction of saltwater will increase the Salinity of the Red Sea.

Dead Sea info

The Dead Sea is a salt lake shared by Jordan and Israel. Its surface and shores are 422 meters below sea level, which is the lowest elevation on the Earth’s surface on dry land. With almost 34% salinity, the Dead Sea is one of the saltiest bodies of water in the world and 8.6 times as salty as the ocean.

During recent decades, the Dead Sea as shrunk rapidly, chiefly due to the diversion of incoming water from the Jordan River. The diverted water is used for households, agriculture and industry. In 1970, the Dead Sea was 395 meters below sea level. In 2006, that number had increased to 418 meters.

The Dead Sea level drop has been followed by a drop in groundwater level and large sinkholes have begun to appear along the western shore.

A gigantic underwater museum filled with 400 sculptures will be created in Mexico’s West Coast National Park in on the Yucatán Peninsula. The artistic director is Jason de Caires Taylor, famous for his underwater sculptures, but other artists will also be involved in the project.

The Subaquatic Sculpture Museum is designed to relieve some of the pressure placed on the regions natural reefs by divers and snorkelers; the national park currently receives almost 300,000 visitors each year and quit a few of these vacationers do not behave as careful around the reefs as they should.

“If they [the tourists] swim near the corals, the divers with little experience might kick them with a fin or hit them with the oxygen tank,” says national park director Jaime

González, adding that some tourists even climb coral reefs and walk on top of them, breaking and shattering them.

In 2005, the park administration submerged 110 hollow domes and concrete structures in layers in the Sac Bajo area in a similar effort to divert tourists from the natural reefs, and this project has already become a success story.

“At first the people of Isla Mujeres told us that they were never going to bring tourists there, but after a few years it became a must-see attraction,” says González.

The park administration is planning to launch the new underwater museum next month by submerging four sculptures in human form. All 400 sculptures in the museum will be made from pH neutral concrete to allow rapid growth of algae and incrustation of marine invertebrates, such as corals. Eventually, the new habitat will also begin to attract reef fish – just like the Sac Bajo project.

“The underwater museum will draw many tourists, allowing us to give a rest to the natural reefs. It’s like a restoration process,” says González.

If everything goes according to plan, some 250 sculptures will have been submerged by April 2010. Each sculpture will be human sized and rest on a four square meter base. Some parts of the museum will be theme based, such as the “Coral Collector” gallery and the “Dream Catcher” section which features bottles filled with messages sent by castaways. There will also be a series of sculptures depicting Maya warriors.

A marine park will be formed at Camden Sound, Australia, in an effort to protect the Humpback whale (Megaptera novaeangliae). Once hunted to the brink of extinction, the humpbacks have already bounced back considerably thanks to conservation efforts and they are now much sought after by whale-watchers, particularly off parts of Australia, Canada, and the United States.

“The Government recognises the Kimberley as one of Australia’s special places,” said Premier Colin Barnett as he unveiled the plans for the park. “That is why we are protecting Camden Sound, making it a marine park, and developing and implementing our Kimberley Science and Conservation Strategy. This strategy will balance the need to develop industry and create wealth with the expectation that the environment and special places will be protected. This remarkable area warrants protection as a first step in the broader conservation of the Kimberley.”

Environment Minister Donna Faragher added that Camden Sound is the largest calving area for humpbacks in the southern hemisphere.

“More than 1000 humpback whales can be found in the Camden Sound ‘maternity ward’ during the calving season,” Faragher said. “They are part of the biggest population of humpback whales in the world – numbering about 22,000 – that migrate from Antarctica every year to give birth in the waters off the north of our State.”

Faragher said the park will be created in consultation with the local indigenous community and all stakeholders with an interest in the area.

Allowing for consultation, including a public comment period of three months, a marine park could be established as early as mid-2010.

Camden Sound

Camden Sound is a bay in the Indian Ocean situated in the Kimberley region of Western Australia. The sound is a highly bio-diverse region; home to animals such as dugongs, crocodiles, sea-snakes, sharks, rays, and three species of sea turtle. Indo-Pacific humpbacked dolphins, Bottle-nosed dolphins, and the newly recognized Snub-fin dolphin can all be found within the borders of the proposed marine park. The sound is also visited by several species of whale, including False Killer whale, Bryde’s whale, Minke whale, and Dwarf Sperm whale. The corals reefs in the region are still fairly unharmed and varied the extensive mangrove forests found along the shores acts as nursery areas for fish and invertebrates.

Humpback whales born in Camden Sound stay there for several months after birth to grow big and strong enough to survive the long journey to the chilly Arctic waters where the humpbacks feed during the summer.

Dr Parker, from James Cook University’s School of Veterinary and Biomedical Sciences, and collaborator Professor Rocky de Nys, from JCU’s School of Marine and Tropical Biology, have just received a $7,000 Collaboration Across Boundaries grant to prove their theory that feeding seaweed to cow will improve their digestion and make them produce less methane.

Just like carbon dioxide, methane is a so called green-house gas and the world’s cattle population accounts for up to 20% of methane emissions from human-related activities. Global warming is suspected to be one of several factors harming our tropical reefs worldwide and finding ways of reducing the amount of methane released into the air is therefore highly interesting.

Dr Parker and Professor Rocky de Nys will now test their theory on herd of cattle living at the University’s Townsville campus.

“Orkney sheep are ruminants that live off seaweed and they do very well on such a diet; so the obvious question is, why can’t cows?” said Dr Parker.

“I like to call it the reef and beef project because it has far reaching implications that come full circle:starting with seaweed, taking in the beef and aquaculture industries, and extending back out to the sea to help conserve the Great Barrier Reef.”