03 January 2009

Return to Sungei Buloh

Sungei Buloh is the reason why I'm involved in the shores.I first started nature guiding at Sungei Buloh and I used to spend every weekend there.

Guiding and/or exploring. I made many friends at Buloh and learnt a lot from them. I started my first online journal based on these trips. This was before free blogging services and before digital cameras! It was real struggle printing, scanning photos and putting everything up manually as a webpage. Looking back, I really appreciate how easy it is to do field trip journals nowadays!

It was while I was at Sungei Buloh that I was introduced to Chek Jawa before deferment of reclamation. Since then, I started working intensively on our shores and spent less and less time at Buloh. It's been years since I actually strolled through my favourite mangroves.How nice to bump into Brandon when I arrived. He showed me the Mangrove pit viper (Trimeresurus purpureomaculatus) that had been hanging around near the Main Bridge for the last five days! It sure looks like it had eaten something very large and was slowly digesting it.

Brandon has been photographing since he was 10! He has a blog with links to fabulous shots on his flickr photos! Do check it out.There were Egrets in the trees at the stream and we heard all kinds of other birds. Huge and fat halfbeaks and archer fishes swam under the bridge as the tide streamed in. It was just like the good old days! Alas, no otters.

I was at Buloh today for a gathering of Buloh volunteers to discuss the Sungei Buloh Masterplan.There was an exhibition of the Plan at the Visitor Centre with lots of exciting details about how this special Nature Reserve will be enhanced and expanded. Here's a recent post about the Master Plan with more media reports about it on the wildsingapore news blog.

Before the meeting started, I thought I'd take a quick stroll through the Mangrove Boardwalk.
I was stopped in my tracks by this very lazy Malayan water monitor (Varanus salvator) that had sprawled right across the boardwalk.It barely moved as I snuck around it, merely lifting its head to glare at me. It too looks like it had a good meal recently.The boardwalks are still very popular with families, even with small babies. These two ladies were trying not to jostle the sleeping infant in the pram as they trundled down the boardwalk.The boardwalk was a lot shadier as all the trees that I remembered had grown much taller. But the familiar guiding stops were still there. Like this Torch ginger with its pink infloresence. What's new are these posts with little electronic things which are part of the Wireless Learning Trail @ Sungei Buloh. Wah, impressive!As in the good old days, there were huge webs of Tent spiders everywhere. Tent Spiders build three-dimensional webs which work differently from flat orb webs. The Red Tent Spider (Cyrtophora unicolor) builds a huge web usually with one or two curled up dried leaves in the centre. This suggests that the spider is a poor housekeeper. But this is far from the truth. The spider has carefully chosen and placed the leaf there and ingeniously hides inside. If you find a web that is built above eye level, you can easily spot this beautiful large red spider by looking up into the underside of the curled up leaf.
Sungei Buloh is one of the few places in Singapore where you can easily view the unique ecosystem of created by Mudlobsters (Thalassina sp.). The mounds of mud chucked up by these burrowing crustaceans provide shelter and food for a variety of animals, many of which are found nowhere else.
The Mangrove Boardwalk is a great, easy introduction to mangroves. You can walk right up to take a closer look at interesting plants such as these tall Nipah palms (Nypa fruticans).
And peer closely at pretty mangrove flowers such as the red ones of Tumu (Bruguiera gymnorrhiza) (left photo) and the white ones of Bakau putih (Bruguiera cylindrica).The Rhizophora tree that I remember and love has grown a lot taller. But its leaves are still full of these neat circular holes. To this day I still don't know what makes these neat hole-punched cutouts.Even at high tide like today, you can get up close to admire the special tree formations of mangrove roots. These roots not only keep the tree upright in soft unstable mud, and help it breathe, but also provide lots of places for small animals to cling to in the rising waters.Mudskippers (Family Gobiidae) of all shapes and sizes are commonly seen here. Tree climbing crabs (Episesarma sp.) crowd around the mangrove tree trunks to stay out of the rising waters where large predators might lurk, looking for a crabby snack.Some trees can have a lot of crabs! It can be hard to photograph the crabs as they often scuttle to the other side of the tree as soon as they detect you.
Alas, some familiar trees are no longer there, and this one has just fallen over. Mangroves are dynamic ecosystems that face the pressures of tidal movement, soft ground and of course old age. Change is a natural part of mangroves and other wild places.The diligent Sungei Buloh Wetland Reserve officers do give Mother Nature a hand. I could see replanting going on with some young trees, still attached to posts.Rare mangroves orchids were also tied in place on various trees.

After the meeting on the Master Plan, James brought us to take a look at some of the rare and special trees that are being nurtured and planted at Sungei Buloh. In particular, Dr Chua Ee Kiam (who is in the midst of writing a book about Sungei Buloh) wanted to see the Bruguiera haineseii.This tree is considered very rare indeed, and there were two small ones growing in the back mangroves.There was also a Barringtonia racemosa tree which is flowering! Its pink fluffy blossoms emerge in a long drooping stem. They bloom at night, so we only saw the remains of last night's flowering. The fruits are tear drop shaped (top left photo). This rare tree is also planted at Chek Jawa and there, I did once see the beautiful flowers.At the entrance to the Visitor Centre, Dr Chua points out the rare Mangrove trumpet tree (Dolichandrone spathacea). It has beautiful white trumpet shaped flowers (none today) which develop into long bean-like fruits, that split open to reveal small flat white seeds.And right in the middle of the pond at the Visitor Centre is a small Berembang (Sonneratia caseolaris) which is extremely rare in Singapore. Its flowers are like the more common Sonneratia alba but with a bright pink tinge! On the way out, what a treat to bump into Mr Tay who planted many of these rare trees at the Reserve. It was so nice to meet other old friends at Buloh too.

Sungei Buloh has always been a special place to me, and it has become even more precious with these rare plants now thriving in the Reserve. With a healthy mangrove, Buloh is also home to many other special animals both on land, in the sea and in the air.

The Master Plan is indeed exciting and provides hope that future generations can continue to enjoy and be inspired by this natural and national treasure.

"No clear rise in sea level in Singapore in last 12 years"

"Our data, based on a measurement of maximum tide levels, show no clear rise in sea level in Singapore over the last 12 years", said Associate Professor Ho Juay Choy, principle fellow at the Energy Studies Institute (ESI) at the National University of Singapore (NUS).
Super high tide at Chek Jawa boardwalk in Oct 08

Previous reports say that a metre-high rise in sea level is enough for several areas around the island to be submerged. 'The increased probability of flooding and coastal erosion as well as saltwater intrusion into fresh water reservoirs are some of the possible consequences,' said Associate Professor Matthias Roth of the department of geography at NUS.

While Singapore may not be drowning yet, it is getting hotter here and at a faster rate over the last two decades.

Last year's average temperature of 27.5 deg C, was 0.6 deg C higher than the average temperature over the last 50 years of 26.9 deg C, said the National Environment Agency (NEA).

From 1951 to 1979, average temperature levels were below this long-term average. But since 1983, they have been on the rise, hovering between 0.1 deg C and 0.6 deg C above the long-term mean.

The NEA said it was difficult to determine how much of the upward trend was due to global warming and how much to Singapore's rapid development and urbanisation over the past 30 years.

'But the trend is consistent with rising global temperature levels,' a spokesman added.

These findings will be part of a country report for Singapore on the Regional Review of the Economics of Climate Change for South-east Asia. The report is being prepared for the Asian Development Bank (ADB).

Singapore's carbon intensity - which measures the ratio of carbon emissions to economic activity - has improved from 0.28 kt/$m (kilotonnes/million GDP) in 1990 to 0.20 kt/$m in 2006.

'This is a direct result of Singapore's efforts to switch from fuel oil to natural gas for power generation and initiatives aimed at improving energy efficiency in various sectors of the economy,' said Prof Ho.

According to the International Energy Agency (IEA), Singapore's carbon intensity levels are below the world average.

From Singapore is hotter than before Amresh Gunasingham, Straits Times 3 Jan 09;

More links

Malaysian fisherman tows in rare giant whale shark

The 7m shark got entangled in his net said the fisherman. "It suffered multiple cuts from the propeller blades under my boat." It took him two hours to tow the shark to shore.
"I have never seen such a gigantic shark in my 30 years as a fisherman."

On Dec 14, the carcass of a 2m dolphin was floating off the Esplanade seafront. The carcass was pulled out of the water by an ntv7 cameraman. The dolphin had suffered a deep cut on its head believed to have been caused by a propeller.

Related posts

Whale death in Manila Bay 'a sign of serious environmental problems'

Roxanne, a 10m 3-ton whale that died in Manila Bay, may not be an isolated case but a sign of serious environmental problems says World Wildlife Fund (WWF) Philippines. "Maybe, it is time we think really hard about what each of us is doing to this planet, and make up our minds to do something right,"
Members of the Philippine coast guard try to lift up the carcass of a minke whale in the waters of the Manila Bay on Dec. 30, 2008. The 10-meter-long minke whale was washed up at a pier late Monday and was tied to a coast guard boat while authorities searched for a crane to haul it out to assess the cause of death. The minke whale may have died of natural causes or may have been hit by a boat before being washed up. It was the first time in recent memory that a dead minke whale was washed up in the Manila Bay, a major shipping channel. (Xinhua/Luis Liwanag) Photo from People's Daily Online.

In August 2007, another carcass of a baleen whale was found floating at the mouth of Manila Bay. A Longman's beaked whale, one of the least studied of all whales, had also stranded and died on a Davao beach. The autopsy of the whale’s internal organs found plastic bags in its stomach.

Roxanne was buried at the 1,000-square meter Dagupan fish cemetery. It took almost three hours to bury the whale. It was the 15th sea mammal and the biggest so far to be buried there. Those who witnessed the burial could not help but lament the demise of another gentle sea mammal as they watched its parts being brought down, chunk by chuck, by a big boom truck into a grave.

Roxanne could have been dragged by a ship to the harbor. Based on its necropsy, the whale could have drowned. The necropsy also showed that the whale's stomach was empty and there was not a piece of plastic found there. Whales and dolphins usually die after accidentally swallowing plastics.

Earlier in December, the Philippines Supreme Council ordered a clean up of Manila Bay. The government was ordered to ensure homes and establishments along river systems have wastewater treatment facilities or hygienic septic tanks; to dismantle all structures and encroachments on rivers, waterways and esteros leading to the basin; to restore fisheries and aquatic resources in the bay; to enforce pollution laws and draw up public education on pollution.

Full articles on the wildsingapore news blog.

Aquaculture "most rapidly increasing food production system worldwide"

Aquaculture production of seafood will probably remain the most rapidly increasing food production system worldwide through 2025, according to an assessment published in the January 2009 issue of BioScience.
Floating fish farms off Pasir Ris in Singapore

The assessment, by James S. Diana of the University of Michigan at Ann Arbor, notes that despite well-publicized concerns about some harmful effects of aquaculture, the technique may, when practiced well, be no more damaging to biodiversity than other food production systems. Moreover, it may be the only way to supply growing demand for seafood as the human population increases.

Among the most potentially harmful effects of aquaculture, according to Diana, are the escape of farmed species that then become invasive, pollution of local waters by effluent, especially from freshwater systems, and land-use change associated with shrimp aquaculture in particular. Increased demand for fish products for use in feed and transmission of disease from captive to wild stocks are also hazards.

Nonetheless, when carefully implemented, aquaculture can reduce pressure on overexploited wild stocks, enhance depleted stocks, and boost natural production of fishes as well as species diversity. Some harmful effects have diminished as management techniques have improved, and aquaculture has the potential to provide much-needed employment in developing countries.

Finfish, mollusks, and crustaceans dominate aquaculture production; seafood exports generate more money for developing countries than meat, coffee, tea, bananas, and rice combined.

The full report is available for free download (PDF) on the American Institue of Biological Sciences website for a month.

Full articles on the wildsingapore news blog.

Related posts

02 January 2009

2009, International Year of ?

2008 was International Year of the Reefs (which was supported in Singapore) and International Year of the Potato and International Year of the Frog.

What is featured for 2009?

As far as I could find out, 2009 is International Year of Astronomy. 2009 is also International Year of Natural Fibres. Both were proclaimed in the UN General Assembly.

We'll have to wait a while before we get to anything vaguely ecological. In 2011, it will be International Year of the Forests according to the Wikipedia page on International Observances.

Underwater vehicle trials near Hantu and Semakau in Jan 09

These are being conducted near Pulau Hantu and the natural shores on Pulau Semakau in January.
What's going on?

Environmental Sampling and Acoustic Experiments at the Selat Pauh Anchorage
from Port Marine Notice No. 01 of 2009 dated 2 Jan 08
With effect from 07 Jan 2009 to 23 Jan 2009, 0800 to 1700 hours daily excluding Saturdays and Sundays, at Selat Pauh Anchorage (See above plan)

There will be measurements of ocean water and sea-bottom properties by unmanned vehicles and surface craft. The unmanned craft will be operating in a 500m radius of the work boats. Acoustic communication tests will also be carried out in the working area. A safety boat will be in attendance during the entire period of experiment
at the anchorage. Further enquiries relating to the project can be directed to Ms Regina
Chan, the project coordinator, at Tel 9835 1615 or email: regina@smart.mit.edu
There were earlier MPA notices about underwater vehicle trials in the same vicinity in Jun-Jul 08 and Sep 08. Although at that time, the working area was somewhat different.From the SMART website:
SMART is the Singapore-MIT Alliance for Research and Technology (SMART) Centre, "a major new research enterprise in Singapore established by the Massachusetts Institute of Technology (MIT) and the National Research Foundation (NRF) of Singapore."

Among the SMART projects is the Center for Environmental Sensing and Modeling (CENSAM) a center of research excellence in the area of environmental sensing and modelling, established within SMART. The CENSAM’s project aim is to provide proof-of-concept for pervasive monitoring and multi-scale modeling of the ocean, land and atmosphere.
From the CENSAM website
One of the research projects is Marine & Underwater Sensing which includes this project:
Map-Based Navigation for Autonomous Marine Systems

This project focuses autonomous monitoring and surveying the Singapore Harbor area, using surface and underwater vehicles. The system of multiple agents will be capable of individual as well as coordinated actions relative to feature maps, and adaptive sampling, and will interface with new acoustic communication and navigation systems. Further, the vehicles will host advanced sensors such as millimeter-wave radar and imaging sonar, and provide ocean deployment opportunities for sensors and other devices being developed by CENSAM colleagues. We are exploring broader opportunities in marine vehicles technology, including ultrasonic propulsion.
Autonomous Underwater and Sea Surface Vehicles

Facebook Group: Boycott Sentosa Marine Life Park

"I will boycott Resorts World Sentosa and its Marine Life Park" was set up by Ping Teo (creator), Jaki Teo, Bianca Polak, Woon Tien Wei and Jennifer Teo.
It currently has nearly 600 members, although it seems to have just been started a few days ago.

There will be an official whale shark petition coming up in January. This will be actioned by Sea Shepherd Conservation Society, ACRES, lovesharks.sg, SPCA and WildAid (TBC), according to the latest news on the FB group.

More on the Facebook group site.

More links

Whale stranded in Sumatra

A one-ton whale was stranded on Bengkulu, Sumatra.
As the whale was weak from a head wound, the villagers who found it killed and ate it.

Whale stranded on Jakat beach, Bengkulu
Antara 31 Dec 08;
Bengkulu, (ANTARA News) - A whale estimated to weigh more than a ton was found stranded at the Jakat Beach, Bengkulu, on Tuesday, with a serious injury to its head possibly caused by a collision with a coral rock.

The giant mammal, which was still alive but very weak due to the wound, was found by Buyung Pesong, a local fisherman.

Pesong suspected that rough waves had tossed the whale against a coral reef.

He and other fishermen later decided to kill the whale and cut the meat into pieces for consumption by local villagers.

According to Pesong, the whale was too weak to survive, besides the whale`s meat would help fishermen and their families as rough waves and strong wind had prevented them for fishing over the past one week.

Ocean acidification slowing Great Barrier Reef growth

The Great Barrier Reef is growing at its slowest rate for at least 400 years, researchers have found.While growth between 1900 and 1970 increased, it has subsequently started to decline at a rapid rate. Glenn De'ath, co-author, said the corals would stop growing altogether by 2050 if the trend identified in the study continued.

It is believed that increased ocean acidification is the main culprit.

Glenn De'ath and colleagues at the Australian Institute of Marine Science in Townsville, Queensland, examined Porites coral samples stretching as far back as 1572. Because Porites lay down annual layers—like tree rings—changing environmental conditions are etched into their skeletons.

The team, which published the findings in the journal Science, looked at a total of 328 colonies spanning the 1,600 mile long reef which is off the north east coast of Australia. They found that growth slowed by roughly 13 percent since 1990.

Hard corals "are central to the formation and function of ecosystems and food webs, and precipitous changes in the biodiversity and productivity of the world's oceans may be imminent."

The Great Barrier Reef is the largest coral reef system in the world—and the biggest sign of life on Earth, visible from space. It is a collection of 2,900 reefs along 2,100 km (1,300 miles) of Australia's northeast coast in a marine park the size of Germany.

Full articles on the wildsingapore news blog.

More links

01 January 2009

9 Jan (Fri): Workshop for Nature Guides - Hard Corals

The Hard Cnidarians Workshop
by the Leafmonkey Workshop

What are "hard cnidarians"? These aren't difficult cnidarians, but corals with hard skeletons!Living reefs of Raffles Lighthouse, SingaporeThe focus of this workshop is on connecting ordinary people with nature. If you are a nature guide and have been struggling, trying to digest and convert biological facts to fun stories for your visitors, this workshop is for you!

This workshop aims to bring experienced and new nature guides together to brainstorm ideas. Let's learn from one another, and come up with new ways to share our passion.

Be prepared to work hard, have fun, make new friends and definitely learn new ways of looking at guiding and our wild places.

SPEAKER
Jeffrey Low, Blue Water Volunteers and NParks
Jeff is a marine biologist by training and profession. He is the scientific officer of Blue Water Volunteers and Hard Coral Master (see his flickr coral guide). Jeff also conducts a series of ReefFriends training sessions for volunteer divers surveying our shores.


Jeff giving a talk about corals in Singapore at the International Year of the Reef 2008 launch, Reef Celebrations, with a video clip of his talk on the Singapore Celebrates our Reefs blog.

More details of the event on the Leafmonkey Workshop

Time: 7 - 9.30pm
Venue: Civil Service College, 31 North Buona Vista Road Singapore 275983 [Map]
Website: http://leafmonkeyworkshop.blogspot.com/
Contact: leafmonkey@gmail.com

Call to conserve Johor shores

The lush seagrasses and marine ecosystems in Johor should be preserved, especially as they lie close to planned industrial developments, says a letter to The Star.
These shores lies across from the TeamSeagrass monitoring site at Tuas. Among the habitats mentioned were seagrasses and reefs at Pulau Merambong (here's more about this island). The area is also near on-going reclamation at Tuas.

Sea grass site of great value
The Star 1 Jan 09;
JOHOR is endowed with amazing biodiversity and has much to offer everyone, be it the tourist, naturalist or researcher.

It has the Panti bird sanctuary, the fabled Mt Ledang, Endau Rompin, several beautiful islands and now the amazing Merambong sea grass located close to the estuary of Sungai Pulai (Gelang Patah), which is the biggest in Malaysia and boasts a rich assortment of biota, including the sea cow or dugong and sea horse (hippocampus). These are species vulnerable to extinction.

The sea grass beds are the nursery of many fishes, shrimps and shellfish, which provide a perfect natural sanctuary for them to thrive and grow.

But sadly, we Malaysians only know about migration of birds when there is so much of migratory fishes plying between the Malacca Straits and the Riau Archipelago which we are ignorant of. This is unpublished research which needs to be pursued further.

I sincerely urge the Fisheries Department to play a proactive role in conserving this valuable site along with the neighbouring sea grasses and work with Taman Laut and other statutory bodies to gazette this site.

They have a good overview of the sea grass community, having done several similar studies in the South China Sea.

Presently, it is perceived that the Fisheries Department is only interested in commercial farming and aqua culture.

Its role is supposed to be much wider and diverse. A balance is imperative as this would be vital to long-term conservation and promulgation efforts.

Without preservation of such habitats, we would not have enough of fish, which is a source of valuable protein.

I strongly urge the Fisheries Department to act fast before our natural resources are depleted beyond sustainability.

Besides the gazetting of the valuable sea grass, more research and crucial work need to be undertaken on habitat preservation and fish migration in collaboration with our universities and also our Asean partner nations which has a stake in this migratory flow of fishes.

Understanding their flow cycle and habitats would assist us in conserving their nurseries more professionally.

Perhaps the Fisheries Department should immediately take an inventory of the area and determine the extent of pollution where these sea grasses are located and establish buffer zones in view of the rapid development of the adjacent areas earmarked for industrial development.

An integrated plan is needed to integrate the coral reefs of Pulau Merambong, the mangroves and sea grass holistically as they form a vital ecosystem in the conservation process.

The future of this rich biodiversity legacy and living heritage (sea grass meadows) of Johor needs urgent attention, more so as this area is close to the Iskandar Development region.

Perhaps the Iskandar Develop­ment authorities should also take an interest in this area as it is part of the natural green lungs of this integrated development region and will be scrutinised by the investors on how much we really care for our environment.

MAH HONG SENG,
Kuala Lumpur.

Great fireworks - what about the fallout?

Fireworks often contain metal salts to give them colour, such as barium for green flashes and strontium for red.
Fireworks over Marina Bay on 31 Dec 08: Photo Channel NewsAsia

A study of the fallout from a New Year display in Austria shows for the first time that the fireworks can aggravate respiratory conditions like asthma because they shoot out harmful aerosols. Fallen snow before and after a display in the village of Saalbach was analysed. The researchers found "huge amounts of barium" in the snow.
Fireworks over Marina Bay on 31 Dec 08: Photo Straits Times

Considering that 250,000 people watched the fireworks in Singapore last night, and that the fireworks were over the Marina Bay, our latest freshwater reservoir, I wonder if the environmental impact had been considered?

250,000 revellers usher in 2009 at Marina Bay
Valarie Tan, Channel NewsAsia 1 Jan 09;
SINGAPORE: Over a quarter million people ushered in the New Year at Singapore's new downtown Marina Bay.

There was high energy to reflect the troubled times, but there were also quiet moments of peace and hope for 2009.

The specially-choreographed fireworks at Marina Bay took spectators' breath away.

"Fantastic fireworks, great show, all good," said a man in the crowd.

An Indian woman added: "It's definitely something different compared to New York, so it's great to be out here."

More than 10,000 spectators came to watch the very first full-length concert out on Marina Bay.

Revellers were entertained with 90 minutes of song and dance by local celebrities from Singapore's MediaCorp Channel 5, Asian Idol Hady Mirza and Filipino band 'River Maya'.

As much as many would say that 2008 has been a rough and unforgettable year, many more celebrating at Marina Bay would hope for 2009 to be a much better one. - CNA/de

Great fireworks, shame about the toxic fallout
Andy Coghlan, New Scientist 22 Dec 08;
WHEN those fireworks light up the sky on New Year's Eve, be careful not to breathe in too much smoke. A study of the fallout from a New Year display in Austria shows for the first time that the fireworks can aggravate respiratory conditions like asthma because they shoot out harmful aerosols.

Georg Steinhauser and his colleagues at Vienna University of Technology analysed fallen snow before and after a display in the village of Saalbach. Fireworks often contain metal salts to give them colour, such as barium for green flashes and strontium for red. The researchers wanted to find out whether any traces remained, clinging to snowflakes. If they did, it would mean the particles were present in the smoke from the fireworks and could be breathed in by spectators.

"We found huge amounts of barium in the snow," says Steinhauser (Atmospheric Environment, DOI: 10.1016/j.atmosenv.2008.08.023). Concentrations were typically 500 times higher than in snow samples taken from the same sites before the display. Barium poisoning is known to constrict the airways, so inhaling it could aggravate asthma symptoms, says Steinhauser.

Fireworks have been linked to breathing difficulties before. A study during the Indian Diwali festival, of which firecrackers are a key part, showed that asthma cases rose by 12 per cent, and some spectators without asthma even had attacks of bronchitis.

The team are now developing fireworks that are free of both barium and perchlorate oxidant, which supplies the oxygen for the pyrotechnic combustion. Perchlorate can contaminate water supplies, impair thyroid function and harm fetuses.

In the meantime, Steinhauser says people can still watch displays - as long as they try not to inhale.

The Dolphin Rosetta Stone?

Dolphins have long been suspected to 'speak' a language but the complexity of the sounds they make is difficult to analyse.

"The CymaGlyphs can be likened to the hieroglyphs of the Rosetta Stone. Now that dolphin chirps, click-trains and whistles can be converted into CymaGlyphs, we have an important tool for deciphering their meaning."
Because the higher harmonics cannot be imaged, the cetacean words are thus simplified. The principle is similar to the way our ear-brain mechanism recognises the voice of a friend on the phone when only a single word is spoken, even though the bandwidth of the phone is very limited compared with face-to-face speech. The resulting "CymaGlyphs" (the name coined to describe visible sound patterns) could form the basis of a lexicon of cetacean language, each pattern representing a thought. (Credit: Image courtesy of Sonic Age Ltd)

Songs From The Sea: Deciphering Dolphin Language With Picture Words
ScienceDaily 31 Dec 08;
In an important breakthrough in deciphering dolphin language, researchers in Great Britain and the United States have imaged the first high definition imprints that dolphin sounds make in water.

The key to this technique is the CymaScope, a new instrument that reveals detailed structures within sounds, allowing their architecture to be studied pictorially. Using high definition audio recordings of dolphins, the research team, headed by English acoustics engineer, John Stuart Reid, and Florida-based dolphin researcher, Jack Kassewitz, has been able to image, for the first time, the imprint that a dolphin sound makes in water. The resulting "CymaGlyphs," as they have been named, are reproducible patterns that are expected to form the basis of a lexicon of dolphin language, each pattern representing a dolphin 'picture word.'

Certain sounds made by dolphins have long been suspected to represent language but the complexity of the sounds has made their analysis difficult. Previous techniques, using the spectrograph, display cetacean (dolphins, whales and porpoises) sounds only as graphs of frequency and amplitude. The CymaScope captures actual sound vibrations imprinted in the dolphin's natural environment-water, revealing the intricate visual details of dolphin sounds for the first time.

Within the field of cetacean research, theory states that dolphins have evolved the ability to translate dimensional information from their echolocation sonic beam. The CymaScope has the ability to visualize dimensional structure within sound. CymaGlyph patterns may resemble what the creatures perceive from their own returning sound beams and from the sound beams of other dolphins.

Reid said that the technique has similarities to deciphering Egyptian hieroglyphs. "Jean-Francois Champollion and Thomas Young used the Rosetta Stone to discover key elements of the primer that allowed the Egyptian language to be deciphered. The CymaGlyphs produced on the CymaScope can be likened to the hieroglyphs of the Rosetta Stone. Now that dolphin chirps, click-trains and whistles can be converted into CymaGlyphs, we have an important tool for deciphering their meaning."

Kassewitz, of the Florida-based dolphin communication research project SpeakDolphin.com said, "There is strong evidence that dolphins are able to 'see' with sound, much like humans use ultrasound to see an unborn child in the mother's womb. The CymaScope provides our first glimpse into what the dolphins might be 'seeing' with their sounds."

The team has recognized that sound does not travel in waves, as is popularly believed, but in expanding holographic bubbles and beams. The holographic aspect stems from the physics theory that even a single molecule of air or water carries all the information that describes the qualities and intensity of a given sound. At frequencies audible to humans (20 Hertz to 20,000 Hertz) the sound-bubble form dominates; above 20,000 Hertz the shape of sound becomes increasingly beam shaped, similar to a lighthouse beam in appearance.

Reid explained their novel sound imaging technique: "Whenever sound bubbles or beams interact with a membrane, the sound vibrations imprint onto its surface and form a CymaGlyph, a repeatable pattern of energy. The CymaScope employs the surface tension of water as a membrane because water reacts quickly and is able to reveal intricate architectures within the sound form. These fine details can be captured on camera."

Kassewitz has planned a series of experiments to record the sounds of dolphins targeting a range of objects. Speaking from Key Largo, Florida, he said, "Dolphins are able to emit complex sounds far above the human range of hearing. Recent advances in high frequency recording techniques have made it possible for us to capture more detail in dolphin sounds than ever before. By recording dolphins as they echolocate on various objects, and also as they communicate with other dolphins about those objects, we will build a library of dolphin sounds, verifying that the same sound is always repeated for the same object. The CymaScope will be used to image the sounds so that each CymaGlyph will represent a dolphin 'picture word'. Our ultimate aim is to speak to dolphins with a basic vocabulary of dolphin sounds and to understand their responses. This is uncharted territory but it looks very promising."

Dr. Horace Dobbs, a leading authority on dolphin-assisted therapy, has joined the team as consultant. "I have long held the belief that the dolphin brain, comparable in size with our own, has specialized in processing auditory data in much the same way that the human brain has specialized in processing visual data. Nature tends not to evolve brain mass without a need, so we must ask ourselves what dolphins do with all that brain capacity. The answer appears to lie in the development of brain systems that require huge auditory processing power. There is growing evidence that dolphins can take a sonic 'snap shot' of an object and send it to other dolphins, using sound as the transmission medium. We an therefore hypothesize that the dolphin's primary method of communication is picture based. Thus, the picture-based imaging method, employed by Reid and Kassewitz, seems entirely plausible."

The CymaGlyphs of dolphin sounds fall into three broad categories, signature whistles, chirps and click trains. There is general agreement among cetacean biologists that signature whistles represent the means by which individual dolphins identify themselves while click trains are involved in echolocation. Chirps are thought to represent components of language. Reid explained the visual form of the various dolphin sounds, "The CymaGlyphs of signature whistles comprise regular concentric bands of energy that resemble aircraft radar screens while chirps are often flower-like in structure, resembling the CymaGlyphs of human vocalizations. Click trains have the most complex structures of all, featuring a combination of tightly packed concentric bands on the periphery with unique central features."

Regarding the possibility of speaking dolphin, Kassewitz said, "I believe that people around the world would love the opportunity to speak with a dolphin. And I feel certain that dolphins would love the chance to speak with us - if for no other reason than self-preservation. During my times in the water with dolphins, there have been several occasions when they seemed to be very determined to communicate with me. We are getting closer to making that possible."

Adapted from materials provided by Sonic Age Ltd, via AlphaGalileo.

31 December 2008

Happy New Year from Sisters Island

We meandered to Sisters Island this last sunset of 2008, a few of us die-hard shore explorers.It wasn't really a low tide, but low enough to explore the splendid Sisters shores.

I stayed mostly on the high shore, and for the first time, saw the Haddon's carpet anemone still submerged.With a pair of resident anemone shrimps (Periclimenes brevicarpalis) happily wandering about on their host home.

Even on the high shore, I came across six clumps of Acropora hard corals (Acropora sp.)!Each clump had at least one of these intriguing clams tucked among the branches.I still have no idea what these are.I've seen these little hairy crabs with blue eyes before on Acropora hard corals. But only had some clue after the Red Data Book on Singapore's threatened animals was published. Is this the Hairy coral crab (Cymo andreossyi) which is unfortunately listed as 'Vulnerable'. It is an obligate symbiont (i.e., only found on) Acropora and Pocillopora hard corals. It belongs to the Family Xanthidae.There were lots of other corals too, including this glow-in-the-dark coral!Some corals become luminescent at sunset! Here's more about why this happens.Not all fuzzy things among the coral rubble are rubbishy stones. The octopus is a master of camouflage and this one blended perfectly with its surroundings. Betraying its presence only by slight ripples in the water.Sisters is one of the few places where we can be almost certain to encounter the very pretty Head-stripe goby (Amblygobious stethophthalmus), generally only found near good reefs.

There were plenty of Perchlets (Family Chandidae) everywhere, and a few blue flashes of Silversides (Family Antherinidae).And this fish that I don't know.I saw the Burrowing snake-eel (Pisodonophis crancrivorous) again. And this one stayed so still, I could take close-ups of its head.As well as its sharp pointed tail. The sharp and bony tail tip allows the fish to burrow quickly backwards!

The coral rubble was crawling with these large Black spotted flatworms (Acanthozoon sp.).
There were also lots of fanworms which were too nervous for me to photograph.

Even in sandier areas, we must watch our step.Here is a Horn-eyed ghost crab (Ocypode ceratophthalmus) half buried in the sand. It's easy to overlook it.This is a Horn-eyed ghost crab that is out and about. There were lots of them quietly foraging on the high shores.

There was quite a bit of seaweeds on the shores today. And among them I spotted this tiny slug that seems to be a nudibranch.I don't know what it is.

But the most exciting slug on the shore today was a reprise by the Moon-headed side-gill slug (Euselenops luniceps).We last saw these adorable polka-dotted slugs on Sisters Island in Apr 07, and one was also sighted on Chek Jawa recently. Are they seasonal?

Side-gill slugs belong to Order Notaspidea and and are NOT nudibranchs. They get their common name because they have a large plume-like gill between the mantle and the foot, usually on the right side of the body.Here's a look at the underside of the slug with a glimpse of its side gill.A closer look at the side gill.

The rest of the team saw lots of fantastic stuff like sea snakes, 'Nemos', mushroom corals, more slugs and octopus and fish, and a tree climbing hermit crab. We'll just have to wait for them to blog about these.We ended the trip with a lovely cake provided by November, and lots of yummy home-made cookies by Yue Yun. And of course a toast to our shores and to more adventures in 2009!

Here's what the rest of the team saw:


The original Sisters Islands ...

Originally, the Sisters Islands were ringed by reefs.
These reefs have since been reclaimed to form swimming lagoons.Reclamation added 5.4ha to the islands and were done in 1974 and 1975 at a cost of $1.7 million, from The Coastal Environmental Profile of Singapore, By Lin Sien Chia, Habibullah Khan, L. M. Chou on google books.

What is the future of the Sisters Islands?

In the Master Plan 2008 (which has been gazetted earlier this month), the plans for the Sisters Islands are all light green for "sports and recreation". (Sadly, the map omits the intertidal areas and reefs of the islands).In the Parks and Waterbodies Plan, a chunk of St. John's Island is designated a Nature Area, while the Sisters Island and the waters around them is designated a Marine Nature Area. This is the only designated Marine Nature Area in Singapore so far.
What does this mean?It is reassuring that the beautiful marine ecosystems on the Sisters Islands are recognised in development decisions.

More links

LinkWithin

Related Posts with Thumbnails