Dolphins attracted by magnets?


This video is about bottlenose dolphins and their sounds.

From Wildlife Extra:

New study finds dolphins may be attracted to magnets

The behaviour of six bottlenose dolphins were analysed in the study.

A study undertaken by researchers from the Ethos unit at the Universite de Rennes in France has revealed that dolphins could be magnetoreceptive, which means they have the ability to perceive a magnetic field.

In the wild, the ability of marine mammals to follow migration routes suggests that they might be sensitive to geomagnetic fields, but until now there has been no experimental evidence to confirm this.

Research was conducted at the delphinarium of Planete Sauvage in Port-Saint-Pere, France, and looked at the behaviour of six bottlenose dolphins in response to two separate barrels. One barrel contained a strongly magnetised block, and one contained a demagnetised one. Apart from this detail, the blocks were identical and indistinguishable to the dolphins when they used echolocation.

The dolphins were seen to approach the barrel containing the strongly magnetised block much faster than they approached the barrel with the unmagnetised block. In order to ensure a fair experiment, the dolphins were free to swim in and out of the pool were the barrel was placed, and the person placing the barrel in the pool, and analysing the videos of the dolphins’ reactions, did not know which barrel was magnetised.

Dorothee Kremer, a researcher in the experiment, explains the importance of the study’s findings: “Dolphins are able to discriminate between objects based on their magnetic properties, which is a prerequisite for magnetoreception-based navigation. Our results provide new, experimentally obtained evidence that ceteaceans have a magnetic sense, and should therefore be added to the list of magnetosensitive species.”

Abu Dhabi dolphins research


This video says about itself:

Indo-Pacific Humpback Dolphins at Tin Can Bay, Queensland, Australia

Indo-Pacific humpback dolphins, also known as Chinese white dolphins, are a common sight around the northern parts of Australia. In Australia, you can interact with these cool cetaceans at Tin Can Bay, and if you want, you can even feed them for $5.

In Abu Dhabi, like in Bahrain, there are human rights violations.

However, like beautiful dolphins swim off Bahrain, dolphins swim off Abu Dhabi as well.

From Wildlife Extra:

Results from Abu Dhabi dolphin survey revealed

The Environment Agency – Abu Dhabi (EAD) recently undertook the first vessel-based survey of dolphins in coastal waters of the Emirate of Abu Dhabi as part of its new Dolphin Conservation Programme, which has the goal of monitoring the Emirate’s dolphin population and supporting their long-term conservation.

The survey identified two species; the Indo-Pacific Bottlenose dolphin, and the Indo-Pacific Humpback dolphin. In total, 77 bottlenose were recorded, of which 19 were calves, and 61 humpback, of which 10 were calves. The team also sighted two new born calves, which could indicate that dolphin calving season might occur late spring to early summer in Abu Dhabi.

The 15-day survey – which was conducted in partnership with the Bottlenose Dolphin Research Institute in Spain – was carried out using a custom-made 45-foot boat fitted with an observation platform, and covered 2,000km of Abu Dhabi’s coastal waters, extending from Sila Peninsula in the west to the border of Dubai in east.

The team used photo-identification, taking high-definition images from cameras mounted on drones, in order to identify and track individual dolphins by looking at the unique markings on their dorsal fins. From this they were able to determine the population size.

Results revealed that there were regional differences in which species of dolphin was most dominant: around EAD’s Marawah Marine Biosphere Reserve, Indo-Pacific humpback dolphins were more prevalent, while bottlenose were the most common from Al Dhabbaiya to Ras Ghanadah, and between Al Sila and Sir Bani Yas Island.

Commenting on the survey, Director of Marine Biodiversity at EAD Ayesha Yousef Al Blooshi said: “The data collected from the survey will support us in further developing our conservation initiatives for our marine biodiversity, as well as helping us conserve the natural heritage of Abu Dhabi for future generations.”

Dolphin populations might be seeing better days ahead in Jamaica as the Government aims to implement new regulations on the use of the animals for tourism purposes, addressing the trading of dolphins and their use for attractions: here.

Hunch-backed dolphins off Bahrain


This video is called Chinese White Dolphin (Sousa chinensis chinensis).

In Bahrain, there is not only ugly torture and beautiful birds, but also beautiful dolphins.

From the Bahrain News Agency:

Hunch-backed dolphins sighted in territorial waters

01:52 PM – 31/08/2014

Manama, Aug. 31: The rare species of hunch-backed dolphins (sousa chinesis)

Sic: Sousa chinensis. In scientific names, the first, genus, name always begins with a capital. While the second, species, name does not. Many people make mistakes in this.

have recently been sighted off Sitra Island.

A female dolphin accompanied by a swarm of dolphins was seen attempting to resuscitate her dying youngster who eventually succumbed. Regional experts were consulted to verify the specifies

Sic: species

. According to a previous study conducted in 2006, there were 227 dolphins in Bahrain’s territorial waters during the study period which prefer to inhabit shallow island waters.

The Supreme Council of the Environment (SCE) urged fishermen, seafarers and captains of commercial vessels to take care upon sighting this rare species and other wildlife in order to ensure their safety and contribution in natural habitats and the boom and flourishing of the Kingdom of Bahrain’s maritime ecology. This rare species of dolphins is also known as the White Chinese Dolphin measuring 3.5 meters, weighing 250 kg. It had been sighted for the first time in Hong Kong waters in the fifteenth century. It is now listed as one of the endangered species.

The SCE urged the public to cooperate and to call the Hotline: 80001112 in order to report any damage to the environment which harms wildlife and fauna of all sorts.

The SCE has urged fishermen to comply with national regulations and to avoid incurring damage to marine mammals, dolphins and turtles.

Dolphins, whales squealing with pleasure?


This video is called Science Bulletins: Whales Give Dolphins a Lift.

From Science News:

Dolphins and whales may squeal with pleasure too

by Science News Staff

8:00am, August 15, 2014

Guest post by Chris Riotta

When dolphins and whales squeal, they may not be sending food signals to their friends. They could just be shrieking with pleasure.

After measuring the time delay between a dolphin or whale receiving a reward and the animal’s squeal, one researcher noticed the lags were about as long as the time it takes for the chemical dopamine to be released in the brain. Dopamine helps control the brain’s reward and pleasure centers.

Because the time it takes for the animals to squeal is about the same as for a release of dopamine, the dolphins and whales may be making these sounds of out sheer delight, scientists argue August 15 in the Journal of Experimental Biology.

Thousands of dolphins, video


This video says about itself:

Drones Over Dolphin Stampede and Whales off Dana Point and Maui

25 February 2014

Captain Dave Anderson of Capt. Dave’s Dolphin and Whale Safari in Dana Point, California, at great personal risk, has recently filmed and edited a 5-minute video that contains some of the most beautiful, jaw-dropping, footage ever taken with a drone from the air of a huge mega-pod of thousands of common dolphins stampeding off Dana Point, California, three gray whales migrating together down the coast off San Clemente, California, and heartwarming close-ups hovering over a newborn Humpback whale calf snuggling and playing with its mom as an escort whale stands guard nearby, filmed recently in Maui.

According to N.O.A.A. Southern California has the greatest density of dolphins in the world. We have pods up to 10,000 strong stretched out for miles like the wildebeests of Africa. Over 400,000 common dolphin alone. We also have the largest concentration of blue whales on earth.

Capt. Dave explains, “This is the most beautiful and compelling five minute video I have ever put together. I learned so much about these whales and dolphins from this drone footage that it feels like I have entered a new dimension! I have not been this excited about a new technology since we built our underwater viewing pods on our whale watching boat. Drones are going to change how we view the animal world. Wow!”

Capt. Dave had to film this off a small inflatable boat, launching and catching the quadcopter drone by hand where a miss could mean injury to him from the four propeller blades or loss of the drone. He actually lost one drone on takeoff when it nicked his small VHF radio antenna on the 14 foot rigid inflatable he was filming from and it went into the water. Alone six miles offshore Capt. Dave , without thinking , dove into the cold, late-January waters off Dana Point to retrieve the valuable footage taken on a flight a half hour earlier that morning. “I had my hat and glasses on, I was fully clothed with long-johns on to keep warm and my cell phone and wallet in my pocket,” Captain Dave explained. “It was a stupid move, but the copter started sinking so fast it was my only hope to get the amazing footage I had just shot”. Since then he has attached flotation to the skids, which would save the footage, but every flight over the water still risks the DJI Phantom 2 quadcopter with a small GoPro HERO3 Black camera on it, as the $1,700 rig is not waterproof and the skids will not keep it upright on the ocean.

“I get so nervous every flight over the water now, after the accident, my hands start shaking,” explains Capt. Dave. “My wife says no more drones if I lose this one. But she said that before I lost the other one. Now that she’s seen what it can do, I think she’s just as hooked as I am”.

“This technology, that offers such steady footage from the air for such a low price and is so easy to fly, is new. This was a ten or twenty thousand dollar copter a few years ago and flying those took a great deal of skill. I can’t wait to see what footage this year will bring with this drone, getting a different perspective on the amazing sightings we already have off Dana Point. There is debate in many states right now about making use of these drones illegal. People are justifiably concerned about invasion of privacy. But it would be a shame to have this new window into a whale’s world taken away.”

Entanglement in fishing gear takes the lives of nearly 1,000 dolphins and whales ever day around the world. Captain Dave formed Orange County’s first whale disentanglement group in 2008 and has been involved in disentangling several whales, including a gray whale named Lily, whose disentanglement in Dana Point Harbor made national headlines. He authored the award-winning book, “Lily, A Gray Whale‘s Odyssey”, which won eight awards in 2013 including the prestigious Benjamin Franklin award for Best New Voice from the Independent Book Publishers Association.

A Special Note From Captain Dave:

Attention any would be whale videographers: please only attempt this if you are extremely familiar with whale behavior as it is illegal to do anything that causes the whales to change their normal behavior with big fines- and the authorities do watch YouTube. Different areas have different laws on approaching whales. I am a whale watch captain with nearly 20 years of experience. All laws were obeyed by us during filming. In Maui we sat watching whales from a distance for hours before they moved closer to us. You can never approach them there closer than 100 yards. The Mom and calf as you can see in the film were completely undisturbed by the small drone. NOAA is currently reviewing drones and may create laws or guidelines for using them around whales.

Fully licensed music by David Hollandsworth, themusicase.com.

Video footage is copyright David Anderson/DolphinSafari.com and may not be used without permission.

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Saving Ganges river dolphins


This video from India says about itself:

7 Wonders of India: Vikramshila Gangetic Dolphin Sanctuary

11 feb. 2009

Located in the Bhagalpur district of Bihar, Vikramshila Gangetic Dolphin Sanctuary is a 50 km stretch of Ganges River from Sultanganj to Kahalgaon. The dolphin population across India is estimated to be a little over 1,500. Half of these are found in the Ganga in Bihar. It is the only protected area for these endangered dolphins in Asia.

From Wildlife Extra:

Improved monitoring gives Ganges river dolphin better survival odds

Using a combined visual-acoustic survey method could be a more effective way of monitoring the endangered Ganges river dolphin, scientists have found.

Previously it was believed that visual survey methods – reliant on conservationists spotting and recording surfacing dolphins – were the most cost-effective way of surveying the species. The study revealed that detecting the sound that dolphins emit using a method called a combined visual-acoustic survey, can improve the ability to detect population trends and reduce survey costs.

Scientist Nadia Richman from the zoological Society of London (ZSL) said: “Freshwater cetaceans occupy some of the most densely populated and polluted river systems in the world. We need to make decisions about the best way to manage these species before another becomes extinct. However, these decisions need to be based on evidence which means we need methods that can detect changes in population size in the quickest time possible and for the least cost.”

The ability to detect changes in population size of a species helps to inform conservationists how fast a population is declining, and whether a conservation action has been effective in stopping a decline.

The study was undertaken by scientists from ZSL, Bangor University, the University of Chittagong in Bangladesh, the Wildlife Conservation Society (WCS), the Bangladesh Cetacean Diversity Project, and the Fisheries Research Agency of Japan.

These findings have been published 8th of May 2014 in the journal PLOS ONE. Read the paper here.

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New humpback dolphin sanctuary in Taiwan


This video says about itself:

First Film of Rare Humpback Dolphins with Bottlenose Dolphins in Watamu, Kenya

Thanks to Alex Simpson who edited the original footage with dolphin research photos to produce this video. Watamu Marine Association c/o Lynne Elson took this first ever footage of rare and elusive humpback dolphins on 10th April 2012. This family pod of 6-7 were associating with a pod of Bottlenose dolphins more commonly seen in Watamu Marine Reserve.

From Wildlife Extra:

Indo-Pacific humpback dolphin sanctuary set up in Taiwan

A dwindling population of Indo-Pacific humpback dolphins will be protected with the creation of Taiwan’s first marine wildlife sanctuary. Dolphin numbers have dropped by around 50 per cent according to local conservation groups, because of habitat degradation, industrial expansion and pollution.

Tsai Chia-yang, head of the Chuanghua Environmental Protection Union, said: “Indo-Pacific dolphin population is a key index to measure the health of the maritime environment.”

The Council of Agriculture confirmed the sanctuary, which will be off the west coast of the country, will cover a large area of 76,300 hectare (188,461 acres).

Normal fishing in the area will be unaffected, as the government said a total ban was not feasible as the success of the sanctuary depends on the cooperation of local fishermen, but guidelines have been tightened for operators in the region and there will be tough punishments for illegal fishing of the endangered species. Dredge fishing has also been banned.

In a further step, officials announced that any development projects in the area will require government approval.

Anyone caught poaching the Indo-Pacific humpback dolphin could face up to two years in jail and will be fined Tw$500,000 (US$16,530), and anyone caught seriously damaging the habitat could end up with a five years’ prison sentence.

“Illegal fishing has seriously ruined the coastal ecological environment, threatening the endangered dolphins,” said Kuan, referring to the fact that the Indo-Pacific humpback dolphins eat mullet among other fish.

In 2011, President Ma Ying-jeou ruled an end to a controversial plan to build a massive oil refinery and more than 20 related petrochemical plants in western Taiwan. This was in reaction to a series of protests for the endangered humpback dolphins.

He said there was a need for Taiwan to balance economic development with environmental protection. The setting up of this sanctuary for Indo-pacific humpback dolphins is a big step forward for the species.

Scientists name new species of cetacean: The Australian humpback dolphin: here.

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