NAUUP – AQUAICBAS
Aquatic Activities UPArchive for March 12, 2008
"Modelos Fotográficos" Precisam-se! Ganha uma T-Shirt !
Enviem a vossas fotos (face e corpo completo) para: aquaicbas@cienciasdomeioaquatico.com
e ganha uma T-Shirt!
Sagres: Saída Adiada para nova data: Alteração Metereológica
Com a Nortada e vagas, nem desfocados iriamos ver os golfinhos; porquê?…
Desta forma e tendo em conta que a Nortada vai pegar forte em Sagres, a viagem foi adiada para uma nova data, a ser publicada brevemente.
Para quem anda pouco no Mar, ou não compreende o efeito da nortada para o Dolphin Watch, é muito simples… os avistamentos são feitos numa primeira-mão, visualmente deslocando-se a embarcação até ao local. Logo se Nortada levanta, as vagas levantam impossibilitando essa detecção à distância.
Para aqueles mais experientes e habituados às lides do Mar, Nortadas e afins, este facto é facilmente compreensível, para os menos experientes e que iriam fazer a sua primeira experiência, aqui ficou um breve esclarecimento.
Tuna threatened by oversized fishing fleet: WWF
ROME (Reuters) - There are far too many boats fishing for tuna in the Mediterranean, putting further strain on stocks of a species already threatened with extinction, environmental group WWF said in a report published on Wednesday.
Atlantic bluefin tuna, sometimes described as “floating goldmines” due to their spectacular price tag when sold for sushi, are under threat from over-fishing and an international agreement sets quotas on how many each country can land.
But in a study into the number and size of fishing vessels, WWF, formerly the World Wildlife Fund, found there were at least one third more boats than needed to meet legal quotas.
“It is crazy,” said WWF’s Sergi Tudela. “The numerous new fleets are so modern and costly that fishermen are forced to fish illegally just to survive — and worse still they are fishing themselves out of a job.”[+]
Source: ENN
Thawing ice threatens China Yellow River flood
BEIJING (Reuters) – China’s northern region of Inner Mongolia is on high alert against a severe flood threat caused by ice blocking the Yellow River during the spring thaw, state media said.
More than 70,000 people in the region were on standby for rescue and disaster relief efforts along the frozen 720-km (450-mile) stretch of China’s second longest river, known as “China’s sorrow” for its frequent flooding.
“The People’s Liberation Army’s air force and artillery troops have also joined the flood prevention operation,” Xinhua news agency said. “Blasting will be carried out if there are any big ice blockages on the river.”
Sections of the river freeze and thaw at different times. If a blockage persists, water levels may rise and cause flooding and dam bursts, threatening lives and property. The ice-run phenomenon happens at the start of winter and spring.[+]
Source: ENN
Cursos Agendados HALIOTIS
Haliotis tem Protocolo Oficial com o AQUAICBAS
Datas dos Próximos Cursos:
- 15 Março………PADI Rescue Diver
- 22 Março………PADI Deep Diver
- 29 Março………PADI AWIP (identificação de espécies, peixes)
- 5 Abril………….PADI OWD
- 19 Abril………..PADI DSAT TEC DEEP DIVER
Continental Drift, Sinking Ocean Basins Major Factor In Sea Level Changes
The effect of a 170m sea level rise on today’s continents (dark blue), based on combined changes in ocean basin volume and the melting of icesheets
What the world may look like 80 million years from now, with sea levels 120 m lower (exposed land shown in dark green). Images courtesy of R. DietmarSea levels were 550 feet (170 m) higher in the late Cretaceous period, about 80 million years ago, than today, shows a new reconstruction of historic ocean basins published in the journal Science. The authors say the work may help model current global warming-driven sea level change. Analyzing data on ocean crust production, ocean sediment buildup and tectonic plate boundaries to reconstruct ancient ocean basins, R. Dietmar Muller of the University of Sydney and colleagues modeled a late Cretaceous sea level that was 550 feet (276-878 feet) [170 (85 to 270) meters] higher than it is today. The estimates center around geological changes near New Jersey, where plate movement might have pulled the Jersey coast downward by 340-585 feet (105 to 180 meters) in the past 70 million years. Muller and colleagues says the results “could help reconcile different Cretaceous sea level estimates from the area” as well as improve forecasting for sea level change due to warming climate. “A combination of a global ocean basin volume analysis with modern geodynamic models provides a powerful tool for discriminating eustasy from regional, time dependent sea-level variations caused by mantle convection. Our global sea-level curve calibration provides an improved framework for sequence stratigraphy, resource exploration, and models for long-term climate change,” the authors write. The study suggests that the current rise attibuted to thermal expansion of sea water and melting ice is but a brief interruption of an broader geological trend toward deeper oceans. Overall the authors forecast a sea level decline of 120 meters over the next 80 million years. R.D. Muller et al (2008). Long-Term Sea-Level Fluctuations Driven by Ocean Basin Dynamics. Science 07 March 2008.
Source:underwatertimes.com
Moko the friendly dolphin saves whales
It could have been a scene from a movie when Mahia’s Moko the dolphin came out of nowhere to save two pygmy sperm whales from what looked like certain death.
The playful dolphin, who has set up home around Mahia on the East Coast, was the perfect helper on Monday as Department of Conservation worker Malcolm Smith toiled to refloat the mother whale and her one-year-old male calf.
“It was amazing. It was like she grabbed them by the flipper and led them to safety,” Mr Smith said.
Mr Smith received a call early Monday morning to say two whales had stranded on the south end of Mahia Beach.
“Generally speaking when pygmy sperm whales strand they end up dying, or they are refloated only to strand again later in the day and die.
“We worked for over an hour to try to get them back out to sea. . . but they kept getting disorientated and stranding again.
“There is a large sandbar just off the shore so that could have been very confusing for them – they obviously couldn’t find their way back past it to the sea.”
After about four unsuccessful refloating attempts it was becoming highly likely the pair would have to be euthanised.
“The whales were getting tired and I was getting cold when Moko turned up.
“She just came straight for us and escorted the two whales along the beach and out through the channel.
“The whales were sitting on the surface of the water quite distressed, they had arched their backs and were calling to one another, but as soon as the dolphin turned up they submerged into the water and followed her.”
Moko led the whales about 200m along the beach towards the headland then led the pair all the way out to sea.
“The things that happen in nature never cease to amaze me.
“It was looking like it was going to be a bad outcome for the whales which was very disappointing and then Moko just came along and fixed it.”
Mr Smith said it was quite possible Moko had heard the whales calling.
” She obviously gave them enough guidance to leave the area because we haven’t seen them since.”
Moko however was seen straight after – the playful dolphin swam straight back close to shore to play with local residents.
source:- NZPA
