Coral-destroying starfish research


This video from Oman says about itself:

The crown of thorns starfish (Acanthaster planci ) [is] one of the oceans’ most efficient coral predators. They can grow to more than 1 m in diameter; have 16 to 18 arms, the entire upper surface of its body covered in long venomous spines. This species was recorded in our … survey at Musandam peninsula.

From Wildlife Extra:

Reef devastation caused [by] Crown-of-thorns outbreaks still a mystery to researchers

Researchers tackle the coral-killing starfish

February 2013. Crown-of-thorns Acanthaster planci is the principle natural enemy of reef-building corals. Outbreaks of this coral-feeding starfish occur periodically, due to reasons that remain unclear. It decimates entire reefs in the space of just a few years, as has been the case in French Polynesia since 2004. A new study conducted by IRD researchers and their partners describes this population explosion around Moorea, the “sister island of Tahiti“. The rate of living coral cover in ocean depths and lagoons alike dropped from 50% (healthy reef) to under 5% in 2009. The ecosystem will need at least a decade to be restored to its original state.

The starfish has spread from island to island

The archipelago has been suffering from a new population explosion of the predatory starfish since 2004. It is one of the most intense and devastating outbreaks ever recorded. The outbreak of Acanthaster began in a very specific location in the Austral and Leeward Islands, then in 2006, the starfish colony spread to Tahiti and Moorea. Thanks to a dozen stations around the island of Moorea, scientists were able to make spatio-temporal observations of the dynamics of the infestation of coral populations. Thus, in a new study published in PLoS One, they described the spread of the coral reef invasion.

Ocean depths and lagoons alike

The starfish first settled in the deeper areas along the outer slopes of the reef, around 20 to 30 metres below the ocean surface. It then rose to a depth of approximately 6 metres, and even colonised certain parts of the lagoon. The damage was gradually observed: from 47% of living coral cover at one of the stations in 2006, for example, this rate dropped to 21% in 2007, 6% in 2008 and 2% in 2009: a disastrous state of affairs that disrupts the structure and functioning of all reef communities (including other coral-feeding species, such as butterflyfish, etc.).

The causes remain unclear – High rainfall is an indicator

What are the reasons behind outbreaks of Acanthaster planci? In Australia, where the pest is also rife, invasions occur after years with high rainfall. Rainfall leads to the excess release of nutrients from human activities and the proliferation of algae on which echinoderm larvae feed. In Polynesia, however, anthropic pressure seems too low and localised to explain such an outbreak of the starfish. The current lack of data on the subject means the phenomenon remains a mystery.

Since the causes of outbreaks remain unclear, there is limited ability to fight against Acanthaster planci in order to protect economic activities around the coral barrier, such as tourism and diving. Researchers are currently studying processes to “recruit” new corals, in other words to repopulate the reef and make it more resilient. Without a new widespread disturbance, a coral ecosystem would need 10 to 30 years to be restored to its original state.

One of the greatest mysteries of modern coral reefs is how they evolved from ancient corals. A critical knowledge gap has long existed in the record of coral evolution. This evolutionary gap occurs during a period of dramatic fluctuations in sea level and changes in the Earth’s climate between 1 and 2 million years ago. During this period many “old” corals went extinct, and the modern reef corals emerged. To fill this key temporal gap and understand the evolutionary and ecological transition to modern Caribbean reefs, the U.S. National Science Foundation (NSF) has funded a University of Miami (UM) project to study corals along the southern coast of the Dominican Republic. It is one of the few areas that contain a record of coral reefs from this period of climatic change: here.

Study finds starfish shed arms to protect against overheating: here.

‘Singing’ sand dunes, Morocco, Oman video


This video says about itself:

24 October 2012

These two sand dunes both “sing” when sand rolls down their sides. But they sing quite differently. For [the] full story behind these dunes, see:
http://www.agu.org/news/press/pr_archives/2012/2012-47.shtml

One of the dunes is near Tarfaya in Morocco. The other one is in Oman.

See also here.

Singing Sand Dunes Explained: here.

Oman monarchy arrests human rights activists


This video is called Oman protesters call for reform.

From the Arabic Network for Human Rights Information (Cairo):

Oman – Dozens of Arrests

13 June 2012

press release

ANHRI denounced the arrests of dozens, over the past few days, by the authorities in Oman against activists, lawyers and bloggers for exercising their rights to oppose and raise their voices calling for reforms. The largest campaign of arrests was on Monday 11/6/2012 after a peaceful protest in-front Muscat police station (which has the authority of judicial arrest) in solidarity with the writers and bloggers who were arrested last week.

Among those arrested in the recent campaign, are the prominent opponents; Said al-Hashemi, Bassima al-Rajhi and a correspondent of Reuters news agency.

“The Omani regime is going crazy as the arrest this time was the largest over the past months and reached the opposition symbols and journalists who practice their jobs” said ANHRI.

A group of writers and activists organized a peaceful protest on Monday in Muscat in-front the police station and its notorious jail where [it is] believed that the prisoners of conscience [are] being held inside.

This protest continued for the third consecutive day amid repeated security harassments in the light of the recent arrests carried out by authorities last week, and detained 10 activists.

This protest comes after the authority has threatened activists and opinion makers with arrests and trials.

Members of the riot police arrested all lawyers and activists involved in the demonstration who were estimated as dozens.

The authorities have closed all roads leading to the protest using the police cars in the side of Araimi complex, in addition to riot police cordoning off the sit-in suddenly,” some of the activists said to ANHRI.

As well eye witnesses confirmed the wide spread of authorities men in civilian clothes on the perimeter of the area. Later, the detainees were taken handcuffed to Sama’el prison, 90 km away from Muscat.

One of the prominent detainees is Said Sultan al-Hashemi who is a well known writer and blogger and was an active protester in the protests Oman witnessed in 2011. He was kidnapped, tortured and was thrown in the desert last year. Also Bassima al-Rajhi who is a media presenter and an active protester as well who lived a similar experience to al-Hashemi’s in the same time.

Among the arrested as well :

Badr al-Jabri; writer and blogger and one of the three selected in the project of forming a reform association in the protests of 2011

Abdullah al-Badi; blogger and activist

Nasser Saleh al-Ghilani

Mahmoud Hamad; poet.

Khaled al-Noufli

Mokhtar al-Hana’i

Omar al-Khrusi

Fahd al-Khrusi

Yahia al-Khrusi

Fatima al-Busaidi

Samaa Eissa

Mona al-Gohouri

Abdullah al-Ghilani

Mo’men al-Rashdi

Mo’men al-Rashdi is 14 year old who is considered as the youngest detainee before being released yesterday. These are in addition to a number of other activists whom ANHRI couldn’t reach or know their names and some of them are relatives to those activists arrested last week.

The activists confirmed the detention of Reuters reporter who was detained in another place and his work ID was taken.

“The escalated fierce attack of the Omani authorities against activists and opinion makers shows how fearful these dictatorships from freedom of speech and opinion also it shows the activists determination to reform despite the sacrifices,” said ANHRI.

“Every regime that insists to violate the right to expression of peaceful assembly, will pay the price for it at the hands of its people.

The suppression of the protests last year and the adoption of legislation limiting the freedoms, all that was not enough to stifle the movement in the country,” added ANHRI.

ANHRI demands the Omani authorities and Sultan Qaboos for the immediate release of all activists and prisoners of conscience in the country and ensure their safety after their release, and the abolition of the legislative amendments approved last year that limit the freedom of opinion and expression in the country and threaten the lives of activists and opinion makers as they are contrary to all conventions and international treaties on human rights.