Tag Archives: dolphin

The reasons behind the islanders’ dolphin hunting practices

Posted on by
Reply

The call of the conch shell evoked dolphin hunters from their beds. Under the moonlight, six men shuffled into the village church.

There the priest led them in a whispering prayer. The tide was high that day. The salt water was pooled in part of the village on Fanarey Island, part of the Solomon Islands in the South Pacific.

They paddled out into wooden canoes before the first light, cutting through the darkness until they were miles away from the coast. After a few hours of scans, we saw one of the hunters, Leslie Hughi, slashing open the glassy water. He raised a 10-foot-long bamboo stick with a cloth tied to the end, warning others of his discovery. He then called his wife. He had found a dolphin. The hunt begins.

These men are among the last dolphin hunters in the Solomon Islands. Some critics say the massacre is cruel and unnecessary. But for some 130 residents of Fanarei, traditional hunts have taken on a new urgency as climate change threatens their homes. They say they need dolphins for their valuable teeth, used as local currency to buy land in the highlands and escape the sinking home.

Each tooth is worth three Solomon Islands dollars (about $0.36) (price set by the Chief of Fanarei), and a single dolphin hunt, which costs about $200, can bring tens of thousands of dollars, more than any other economic activity on the island.

“We regret killing the dolphin, but we really have no other option,” Fugi said. He mentioned that he would be willing to give up the hunt if there was an alternative way to secure his family’s future.

Crops can no longer be grown on about a third of the wana rays in New York City’s Central Park. Once fertile land has been ruined by erosion of salt water. The government promotes seaweed farming as a source of income, while overseas conservation groups provide cash to end the hunt. However, the ocean is both an existential threat and the most profitable resource for villagers. Government research suggests that the island could be underwater by the end of the century.

“For lowland islands like us, I witness with my own eyes how rising oceans affect our lives,” said Principal Wilson Fee, Fanaray.

… (continue for remaining content)

Source: www.nytimes.com

The smile of a dolphin could indicate their playful nature

Posted on by
Reply

Bottlenose dolphins have an open mouth and a facial expression that resembles a smile.

Zoomarin, Italy

Dolphins seem to make open-mouthed expressions most often when being watched by playmates, suggesting that such expressions may be similar to human smiles.

Although we often recognize these as smiles, there is little research into dolphin facial communication.

Want to know more? Elisabetta Palagi Researchers from the University of Pisa in Italy analyzed the behavior of 22 captive bottlenose dolphins (Tursiops truncatus). It takes place in two wildlife parks: Zoomarine Rome in Italy and Planete Sauvage in Port-Saint-Père, France.

Over 80 hours of footage, the team observed a total of 1,288 open-mouthed facial expressions during social play sessions. More than 90 percent of these events occurred during play between dolphins, and the rest occurred during dolphin-human interactions.

Animals were more likely to adopt an open-mouthed expression when their face was within the playmate’s field of view, 89% of the time it was displayed in this situation. When their playmate saw the smile, they smiled back 33% of the time.

“One might argue that dolphins imitate other people’s open-mouthed facial expressions purely by chance, as they are often engaged in the same activity or situation,” Paragi says. “But this does not explain why recipients are 13 times more likely to imitate another dolphin’s open-mouthed expression within one second when they actually see the original expression.”

Other animals, such as monkeys, wolves, and meerkats, may relax and open their mouths to make a “playful face,” but whether this is driven by emotion or a way to communicate intent remains unclear. There is a discussion.

“Is the dolphin’s open-mouthed expression conveying an emotional mood, or is it simply used to tell others, ‘Don’t be scared, we’re just playing!’, or both?” It’s not easy to determine whether that’s the case,” Palagi said. .

She says the study can’t say conclusively whether it’s comparable to a human smile. “We do not claim that a single study will reveal the communication strategies of dolphins during play. However, we would like to open up new areas of research that also take into account visual elements.”

Luciana Moller Researchers from Flinders University in Adelaide, Australia, say that dolphin open-mouth behavior occurs in a variety of situations, including aggressive, sexual, and social interactions. This means that it can’t necessarily be interpreted as a smile, as this is a very versatile signal.

She notes that making sounds could have been a factor in the dolphins opening their mouths, but the study did not examine acoustic recordings.

Another drawback is that they studied small groups of dolphins in captivity, so their behavior may not reflect their behavior in the wild.

“Free-living dolphins have much more space to interact and chase each other while playing, and are often found in waters with poor visibility,” Moller says. . “Visual signals may to be as effective as acoustic signals in these situations.”

Source: www.newscientist.com

The Amazon River was once home to a massive freshwater dolphin.

Posted on by
Reply

Pebanista Yacluna are the closest living relatives River dolphin of South Asia (genus Platanista).

artistic reconstruction Pebanista Yacluna. Image credit: Jaime Blanc.

Pebanista Yacluna About 16 million years ago, it lived in the Miocene Amazon of Peru.

The ancient dolphin was estimated to be 2.8–3.5 m (9.2–11.5 ft) long, making it the largest freshwater dolphin species. dentate (Dolphins, porpoises, and all other toothed whales) are known.

Such large sizes have also been recorded in other proto-Amazonian inhabitants (i.e. fish and crocodiles) and may be due to the greater availability of resources in the proto-Amazonian ecosystem.

“16 million years ago, the Peruvian Amazon looked very different from what it looks like today,” said Dr. Aldo Benitez Palomino, a paleontologist at the University of Zurich.

“Most of the Amazon plain was covered by large lake and swamp systems called pebas.”

“This landscape included aquatic, semi-aquatic, and terrestrial ecosystems (swamps, floodplains, etc.) and spanned what is now Colombia, Ecuador, Bolivia, Peru, and Brazil.”

“When the Pebas system began to give way to what is now the Amazon about 10 million years ago, the new habitat caused Pebanista Yaclunaprey disappears, and the giant dolphin is driven to extinction. ”

“This opened up an ecological niche that is used by relatives of today's Amazon river dolphins (genus Delphinus). inia), and with the rise of new cetaceans such as modern dolphins, they were on the brink of extinction in the oceans. ”

holotype skull Pebanista Yacluna. Image credit: Benites-Palomino other., doi: 10.1126/sciadv.adk6320.

Pebanista Yacluna was a member of platanist ideasa group of dolphins that were common in oceans around the world from 24 million to 16 million years ago.

“We discovered that size is not the only thing to note,” said Dr. Aldo Benitez Palomino, a paleontologist at the University of Zurich and the Natural History Museum of the National University of San Marcos. Told.

“With this fossil record excavated in the Amazon, we expected to find a living relative of the Amazon river dolphin, but instead we found the Amazon river dolphin's closest relative. Pebanista Yacluna It is a river dolphin from South Asia. ”

“Pebanista Yacluna and Platanista Both share a highly developed facial crown, a specialized bone structure associated with echolocation, the ability to emit high-frequency sounds and “see” by listening to their echoes, which is useful for hunting. relies heavily on this. ”

“Echolocation and biosonar are even more important for river dolphins because the waters they live in are very murky, which impedes their vision,” said Dr. Gabriel Aguirre Fernandez, a paleontologist at the University of Zurich.

“The elongated snout with many teeth suggests that: Pebanista Yacluna Like other species of river dolphins today, they eat fish. ”

large adult skull Pebanista Yacluna It was discovered in 2018 at an exposed stratigraphic level along the Rio Napo in Loreto, Peru.

“After 20 years of research in South America, we have discovered several giant dolphins in this region, but this is the first of its kind,” said Dr. Marcelo Sánchez Vilagra, a paleontologist at the University of Zurich. .

“We were particularly intrigued by its unique and deep biogeographical history.”

team's paper Published in the Journal on March 20, 2024 scientific progress.

_____

Aldo Benitez Palomino other. 2024. The largest freshwater toothed whale: A relative of the South Asian river dolphin that lives in the primitive Amazon. scientific progress 10(12); doi: 10.1126/sciadv.adk6320

Source: www.sci.news

The Amazon’s Biggest Freshwater Dolphin Species Now Extinct

Posted on by
Reply

Artistic restoration of Pebanista Yacuruna in the murky waters of the Peruvian Amazon

Jaime Blanc

The Amazon basin was once home to freshwater dolphins that grew up to 3.5 meters long, making them the largest river dolphin known to science.

Researchers say they made this surprising discovery during a 2018 expedition to Peru Aldo Benitez Palomino at the University of Zurich, Switzerland. When the research team saw the animal's fossilized skull sticking out of the river bank, they immediately knew it was a dolphin. Closer analysis confirms that this giant skull is unlike anything previously discovered.

Researchers named this new species Pebanista Yacluna. The name pays homage to the mythical aquatic people, Yacuruna, who are believed to live in underwater cities in the Amazon basin.

The 16 million-year-old fossils were unearthed in an area that was once covered by a “very large lake, almost like a small ocean in the middle of a jungle,” Benitez Palomino said. He says, based on the small eye sockets and large teeth of ancient dolphins. P. Yacluna It was probably a predator with poor eyesight. They relied heavily on echolocation to find fish. “We realized that it was really living in muddy water because its eyes started to get smaller,” Benitez-Palomino said.

Because the fossil was found in the Amazon basin, researchers expected the fossil's closest living relative to be the modern Amazon river dolphin.Instead, they found P. Yacluna It was more closely related to the river dolphin of South Asia. Like them, this ancient species also has a raised crest on its skull that enhances its echolocation abilities.

P. Yacluna Benitez-Palomino said it may have been driven to extinction amid broader ecological changes. “About 11 to 12 million years ago, this huge wetland system began to drain, making way for what is now the Amazon. At that moment, many species became extinct, which is why this giant dolphin Maybe it was fate.”

topic:

Source: www.newscientist.com

Uncommon footage captures killer whale guiding its calf in hunting and launching a dolphin high into the air

Posted on by
Reply

A rare video was captured this week by a whale-watching trip off the coast of San Diego, showing an orca teaching its baby how to hunt by headbutting a dolphin and flipping it over multiple times in the air.

Wildlife filmmaker Domenic Biagini, who shot the footage, described the scene, saying: “The killer whale catches the dolphin, but when the dolphin slows down, he releases it after it is subdued and brings the baby killer whale with him to catch it himself.” “Seeing that level of communication and understanding was like watching a family.”

Biagini owns Gone Whale Watching, one of several companies that spotted a pod of six orcas off the coast of San Diego on Monday. He said the orca hunt took about 30 minutes, which was much longer than the average orca hunt because he was teaching orca pups.

According to marine biologist Alisa Shulman Janiger, killer whales are among the ocean’s apex predators and are known to incorporate their large size and speed into their hunting strategies. She added that it is common for orcas to slow down the prey and show the children how to hunt.

Shulman-Janiger explained that the killer whales in the video are so young that their eye patches are yellow instead of white, a color that eventually fades as they get older.

Where do whales come from?

Shulman Janiger said the whale in Biagini’s footage is an eastern tropical Pacific orca, which typically lives in waters off Mexico and Central America. They are rarely seen in the relatively warm, calm waters of Southern California.

Speaking about the hunting behavior, Biagini said, “We try to explain to our guests that while what whales do to dolphins can sometimes be very gruesome, this is normal and healthy.”

Biagini also mentioned that after Monday’s hunt, the killer whales approached the boat to see what was going on and began to poke their heads out of the water, which is a behavior known as spy hopping.

‘Remember us at your Thanksgiving feast’: Killer whales celebrate the hunt

Biagini said the killer whales often celebrate after a successful hunt and zigzag back and forth through the water. He compared it to the feeling of happiness and smiling after a Thanksgiving meal.

Additionally, Biagini expressed concern about the increasing number of boats getting close to orcas to film social media videos, urging people to film animals in the most ethical way.

Danger of flocking to whale watching

Biagini also raised concerns about the number of boats surrounding the pod of killer whales, stating that too many boats with inexperienced operators could interfere with their hunting behavior or lead to collisions.

In a video he shot, a man driving a boat by himself abandons the wheel to lean out onto the deck to record the video.

Overall, Biagini emphasized the importance of being stewards of animals and approaching them in an ethical way.

Source: www.nbcnews.com