Showing posts with label marine conservation. Show all posts
Showing posts with label marine conservation. Show all posts

Thursday, 10 April 2014

Old Dogs Can Learn ‘Green’ Tricks





A recently published study by the Imperial College London showed that environmental education could be passed between generations and affect behavior. No breakthrough you might think; my parents taught me plenty about how to behave.

Surprisingly, in this study it was school children who taught and changed the behavior of their parents. The results published February 13, 2013 in Environmental Research Letters describe a study on Mahé Island in the Republic of Seychelles. The researchers focused on the destruction of freshwater habitats in the country's wetlands, which was being caused by litter, land reclamation and household wastewater.

Through wildlife club activities in schools, the kids learned about wetland conservation. The big surprise came when parents were given questionnaires. The adults had dramatically changed their attitude to the wetlands over a short 12 month period. They had become much more environmentally responsible falling in line with their kids.




'Ghost fishing' by discarded nets can kill marine life for decades.


In a far more dramatic way the youth of Malaysia’s Pulau Pangkor have ‘rocked the local fishermen’s boats’ and made them think again. “Some of the older generation were overfishing the reef and damaging the coral habitat” says reef ecologist Kee Alfian, of Universiti Kebangsaan Malaysia.
“It was the young reef guides who finally said enough is enough and closed off the area in October, 2011. They didn’t apply to the government for the closure but instead took matters into their own hands and forged an agreement within their community. The area was only about 5,000 square metres ( a football field). No fishing, no collecting, no diving.”

Incredibly, the closed area began to change almost immediately. From an environmental wasteland to noticeably healthier environment in just a little less than 2 years. But the young people went a step farther and have kept the area closed. In the months that followed, fish that had grown large enough spawned in the protected area and were joined by their offspring. As the population grew, fish began to emigrate to the fishing grounds; but they were larger than those that made up the usual small catch of juveniles. Even sea cucumbers that were not being fished increased in numbers.


The entire process has been overseen by Kee Alfian of UKM and REEFCHECK Malaysia who have assisted through transplanting small propagated corals to the area. Stage two of the rehabilitation is being planned and will be implemented in the near future.

But what brought on the initial changes in Pulau Pangkor’s coral reefs? Was it global warming and coral bleaching, coral disease, or yet another new problem upsetting the nature’s delicate balances?

The answer is that the reefs were literally being ‘loved’ to death. People loved to snorkel there, they loved to fish there, to anchor their boats there, they loved to collect the shells, and they loved to dump their waste into the sea so it wouldn’t be a problem on land anymore. The relatively slow rate of recovery of coral reefs is geared to occasional natural disasters, not to prolonged over-use. The reef couldn’t repair itself quickly enough to cope with all the attention it was getting.

 Crown of thorns starfish are coral predators. Normally rare, their numbers can increase to plague proportions when the ecology is out of balance.


Once a popular venue for tourists eager to become underwater explorers, pollution and silt from the land, coupled with overuse had robbed Pulau Pangkor of the treasure that brought that very popularity. The absence of marine park status meant that tourist use and fishing pressure grew unchecked to destructive levels.

By comparison, Pulau Sembilan is located only 18 km to the south and yet a recent survey uncovered hidden beauty and diversity including carpets of anemone and beds of corals.



“I’m amazed as the water visibility is low yet the coral cover is in the same state as in the East Coast where the water is a lot clearer,” says Kee Alfian. The reefs are generally in “fair” condition, with average live coral cover (of both hard and soft corals) of 29% (the average for Malaysia in 2010 is 44%). The corals appear to be growing and reproducing well despite the turbid waters. The incidence of recently killed corals is low (0.44%), indicating few recent disturbances and a low abundance of coral predators.
Much has been said about the global decline of coral reefs and my own 1982 work first suggested that there were  ‘points’ that if passed might become points of no return. Coral reefs as we know them could simply disappear.

Dr. Martin Scheffer (Sept., 2009)of Wageningen University in The Netherlands wrote of these ‘points’, "It's increasingly clear that many complex systems have critical thresholds -- 'tipping points' -- at which these systems shift abruptly from one state to another."



In February, 2010 the American Association for the Advancement of Science held a conference to look at this frightening possibility. Titled “Will Coral Reefs Disappear?” Dr. Simon Donner, an assistant professor in the department of geography at the University of British Columbia, talked about the vulnerability of coral reefs to climate change due to higher ocean temperatures.

“Given the hundreds of millions of people living in the tropics who depend on coral reefs for food, income, tourism and shoreline protection, the loss of reefs is a serious issue”, says Dr. Donner

Dr. Donner says that he is not predicting that coral reefs will go extinct; they will continue to survive, but only in a few habitats, where they are protected from too much change. The reality is that a general loss of live coral cover and a breakdown of the physical structure of reefs will happen on a large scale.


Let’s think again of the wonderful success of the young people of  Mahé Island and Pulau Pangkor. We as S.E. Asians are intimately tied to the sea; we fish in it, play in it, live next to it, and many of us make our livelihoods from it. Young people are showing us the way to turn the overexploitation around. We can and must avoid at all costs the point of no return, the ‘tipping point’, where all that we need from the sea is suddenly lost.

We must stop loving our reefs to death and instead learn a little respect and moderation. We are the only species on this planet that has the power to change the direction we are moving in and there is so little time.


Let our legacy to our children be that we learned from them and made their futures brighter in the process.





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Sunday, 25 August 2013

World’s Largest Sea Turtle Slips toward Extinction. By Dr. Gerry Goeden






 

Gerry is a Malaysian based marine ecologist, Research Fellow and Advisor to the National University of Malaysia, and marine consultant to the Andaman Resort, Langkawi. 


I saw my first Leatherback turtle in the Florida Keys long before that string of gorgeous islands became the foundation of endless high-rise buildings. It reminded me of a flattened car; it was huge!


 
Leatherback turtles can grow to over 3 m long and weigh nearly 1,000 kg. Its front flippers can reach an amazing 2.7 m. They dive to depths of more than 1,000 m and can make trans-Pacific migrations from Indonesia to the U.S. Pacific coast and back again. Surprisingly, they are no larger than other sea turtles at hatching weighing in at only 46 g.

More amazing is that these ancient giants that evolved about 110 million years ago feed almost exclusively on jellyfish. They follow their prey into deep water by day and shallow water by night. They range from the tropics to water as cold as 0.4 °C.
How can such an impressive animal get into trouble?






Recent estimates of global nesting populations are that 26,000 to 43,000 females nest annually, which is a dramatic decline from the 115,000 estimated in 1980. Now an international team led by the University of Alabama at Birmingham (UAB) has discovered a frightening 78 percent fall in the number of nests. The leatherback sea turtle (Dermochelys coriacea) is already critically endangered (IUCN) and the turtle's last stronghold in the Pacific Ocean is now collapsing according to this February 26 report in Ecosphere.

Leatherback nests at Jamursba Medi Beach in Papua Barat, Indonesia now account for 75 percent of the total Leatherback nesting in the western Pacific. Tragically, nesting has fallen from a peak of 14,455 in 1984 to a low of 1,532 in 2011. Less than 500 leatherbacks now nest at this site annually. A nearby ‘secondary’ nesting site at Wermon Beach, Papua Barat now supports less than 1,000 nests and is failing as well.

The team identified four major problems facing leatherback turtles: beach predators, such as pigs and dogs that were introduced to the island now eat the turtle eggs; rising sand temperatures kill the eggs or prevent the production of male hatchlings; the danger of being caught by fisheries during migrations; and harvesting of adults and eggs for food by islanders. It is this last factor that has the greatest impact on these gentle giants.

 

People around the world annually harvest sea turtle eggs. Asian exploitation of turtle nests has been cited as the most significant factor for the species' global population decline. In Southeast Asia, egg harvesting in countries such as Thailand and Malaysia has led to a total collapse of local nesting populations. In Malaysia, where the turtle is virtually locally extinct, the eggs are considered a delicacy. In the Caribbean, some cultures believe the eggs are aphrodisiacs

"The leatherback is one of the most intriguing animals in nature, and we are watching it head towards extinction in front of our eyes," said Dr. Wibbels of the University of Alabama at Birmingham.

The Leatherback’s vulnerability lies in its extraordinary migrations. Travelling more than 7,000 km from Indonesia to California takes it through the territories of at least 20 countries. Many have different laws and varying enforcement.

 


Mr. Tapilatu, a native of western Papua, Indonesia, and research team member has studied Leatherback turtles and worked on their conservation since 2004. His work has been recognized by NOAA, and he will head the Leatherback conservation program in Indonesia. 

Conservation will rely heavily on education of local people and be backed up by a Leatherback hatchery. The hatchery will relocate nested eggs to more suitable temperatures and predator-free locations. But more must be done to protect the giant Leatherbacks on their trans-oceanic migrations.

"Only one hatchling out of 1,000 makes it to adulthood, so taking out an adult makes a significant difference on the population," Dr. Wibbels said. "It is essentially the same as killing 1,000 hatchlings."

"If the decline continues, within 20 years it will be difficult if not impossible for the Leatherback to avoid extinction," said Dr. Wibbels. "That means the number of turtles would be so low that the species could not make a comeback.

Is it only coincidence that the approaching extinction of a jellyfish predator is reported among headlines from around the world describing the almost global jellyfish ‘plagues’ that now close beaches, foul nets, and block seawater intakes on a daily basis?








http://youngmarinescientist.blogspot.com/
http://geraldgoeden.blogspot.com/
http://goedensnews.blogspot.com/
http://goedensnews.blogspot.com/
http://goedenquotes.blogspot.com/
http://goedenscience.blogspot.com/
http://goedenmarineecology.blogspot.com/
http://gerryquotes.blogspot.com/
http://einsteinsnature.blogspot.com/
http://drgerrygoeden.blogspot.com/
http://underwaterinternet.blogspot.com/
http://goedenshark.blogspot.com/






Thursday, 1 August 2013

Discovering The Water Planet by Dr. Gerry Goeden

The following story about the collapse of fisheries and the change in the Ocean's chemistry was  published in the Epoch Times on 9 April, 2013.


Gerry is a Malaysian based marine ecologist, Research Fellow and Advisor to the National University of Malaysia, and marine consultant to the Andaman Resort, Langkawi.



“There has long been a belief that the sea, at least, was inviolate, beyond man’s ability to change and to despoil. But this belief, unfortunately, has proved to be naïve”

                                                                       (Rachel Carson, The Sea Around Us 1951)

I had the immense pleasure of meeting the lady that changed the world and launched the conservation movement through her books when I was only 16. Rachel Carson had already written Silent Spring and The Sea Around Us when I was at my most impressionable. My career in marine science was her fault; and each day I thank her.

I have often said to my students that because I couldn’t be an astronaut, I set out to explore ‘inner-space’ and was going to discover the water planet. All I needed to do this was some diving gear and a lot of enthusiasm. Travelling there was simple! Had humans evolved on the Moon and decided to settle here they would have called this “Water” and not “Earth”.

There is about 1.4 billion cubic kilometres of water spread across 70.8% of the planet’s surface and 97.2% of that water is ocean. The blood that flows through our veins is little more than seawater and we refer to it as “life blood” for good reason. About 70% of the oxygen we breathe is produced by the tiny plants that float in the sea (phytoplankton).

Our climate is driven by ocean currents and recent (2009) studies suggest that these may now change due to global warming, melting the Arctic, and causing flooding that will effect a quarter of the world’s population.

Ecologists talk about biodiversity; about the richness of species in a given area. More kinds of living things make a healthier planet. The sea supports an incredible variety of life; an estimated 80% of all the known life on Earth. And yet, we spend much more money on outer space research than we do on understanding the ‘inner-space’ just offshore.

Why are we so disinterested in rising sea level when 60% of the world’s humans live within 60 km of the ocean? Why do we dump 450 billion cubic metres of poisonous and non-biodegradable waste in the sea each year?

Most of the world’s fisheries are food fisheries supplying roughly 40% of the protein consumed by nearly two-thirds of the world’s population. Some 38 million people make all or most of their living from fishing, landing about 90 million tonnes of fish per year.

But our oceans are in crisis! The FAO estimates that 70% of commercial fisheries have already collapsed or are now collapsing. Sadly, many of these will never recover and will be lost forever. Top predators like tuna, shark, and swordfish have been reduced to a mere 10% of their original numbers and some species are facing probable extinction. I have been told that Malaysian fisheries have removed about 95% of their stocks. Each year we kill and discard globally 30 million tonnes of accidentally caught (bycatch) marine life including dolphins, turtles, crabs, and juvenile fish. In Australia’s north 92% of the catch is of no use to fishermen. As we remove these animals from the food-web we drive down biodiversity and strangle the ocean’s ecological processes.

Coral reefs are now the world’s most endangered ecosystem. These tiny underwater ‘islands of life’ are under threat from human activities and especially from acidification. As we burn more and more fossil fuels we add to the growing levels of carbon dioxide in the atmosphere and change the pH (acidity) of the sea.

The acid threshold for coral is reached when the atmosphere exceeds 350 parts per million of CO2. Tragically that happened about 1988 and by October, 2012 was 391 ppm. The present levels are higher than any time in the last 800 thousand years and probably in the last 20 million years.



Growing acidity in the oceans has a disastrous effect on marine life. It is predicted to fall from pH 8.1 (now) to below pH 7.3 in the year 2300. A long way off? No need to be concerned?

At pH 7.7 we will reach the lethal limit for all shell forming molluscs and reef corals; their shells and skeletons will simply dissolve and they will die. That’s right coral reefs and marine life with shells will die! When will this happen? The shocking answer is that scientific studies are all pointing to 2065. Between now and then there will be huge disruptions of the ecological food web as species begin to drop out. From about 2065 on we can expect the rapid and catastrophic collapse of most stocks of marine life. The ecosystem will simply fail.

This situation is now the most pressing environmental issue we face and as a marine scientist I believe it is the most pressing issue on the planet. I am not alone and have been joined in my concerns by 155 senior marine scientists from 26 countries who recently signed the Monaco Declaration (The Royal Society, 6 July 2009), highlighting the twin threat of growing ocean acidification and global warming.

What astonishing creatures we are! The warning bells have been ringing since Rachel Carson published her wonderful book in 1951. During the last 60 years there have been more scientists alive and doing research than all the scientists that have lived before. And still we race blindly down the road to the ocean’s destruction and possibly our own.




Thirty million tonnes of marine life are caught accidentally and killed each year. Some fish are kept but everything else will be lost.