Blog Tags: Extinction
In this thought-provoking piece on the National Geographic's Ocean Views blog, Mediterranean Science Commission director general Frederic Briand discusses the precarious and uncertain fate of ocean creatures staring down extinction. About sharks and rays he writes:
These are not target species in Mediterranean fisheries but increasingly threatened, as unreported bycatch, by highly intensive fishing and bottom trawl. The status of many of them is unclear, even for species as conspicuous as the sawfish Pristis pectinata (last seen in 1902), the mako shark Isurus oxyrinchus, or the sandtiger sharks Carcharias taurus and Odontaspis ferox, once abundant and now presumed locally extinct.
But it is the baiji, or Yangtze River dolphin, the first marine mammal to go extinct in modern times, that captures the imagination--the passenger pigeon or dodo for our day.
Nearly blind, the baiji patrolled the turbid waters of the Yangtze River for millenia but has not been seen in almost a decade. It was declared extinct earlier this year by the Chinese government. The dolphin likely succumbed to decades of development, pollution, entanglements in fishing gear, ship strikes and an increasingly chaotic acoustic environment in the Yangtze that proved lethal to a species almost entirely dependent on sound to communicate, find food and find mates.
Now the vaquita, a porpoise in the Sea of Cortez (literally "little cow") takes up the unenviable mantle of most endangered cetacean in the world. The largest threat faced by the vaquita are gillnets.
As of today, the ocean’s largest sea turtle now has 41,914 square miles of Pacific Ocean it can call its own.
Oceana has been working for five years to protect habitat critical to the survival and recovery of the endangered Pacific leatherback sea turtle, and it paid off. Thanks to a decision by the National Marine Fisheries Service, these magnificent reptiles will now be safeguarded off the U.S. West Coast.
Leatherback sea turtles migrate from Papua, Indonesia to the U.S. West Coast every summer and fall to feed on jellyfish — a 12,000-mile round-trip journey that is the longest known migration of any living marine reptile.
Sadly, these navigators encounter a gauntlet of threats as they make their journey across the Pacific such as poaching; ingestion of plastic bags which they mistake for their favorite food, jellyfish; and entanglement and drowning in longline and gillnet fishing gear.
Due to these threats Pacific leatherbacks have declined more than 95 percent since the 1980s and as few as 2,300 adult female western Pacific leatherbacks remain. There have already been localized extinctions of leatherback sea turtles in India and the Sri Lanka and Malaysian populations have nearly disappeared.
Leatherbacks from Papua, Indonesia and those that feed off the U.S. West Coast, are one of the turtle’s last strongholds in the Pacific Ocean. It is heartbreaking to think that a species that has been swimming the world’s oceans for more than 100 million years could indeed be wiped out by human actions.
Do you want the good news or the bad news first? Let’s start with the bad:
In a new report released this week, the International Programme on the State of the Ocean (IPSO) warns that ocean life is "at high risk of entering a phase of extinction of marine species unprecedented in human history”.
The preliminary report from IPSO is the result of the first-ever interdisciplinary international workshop examining the combined impact of all of the stressors currently affecting the oceans, including pollution, warming, ocean acidification, overfishing and hypoxia.
It turns out that the confluence of overfishing, pollution and climate change is worse than previously thought, as Oceana’s Senior Vice President and Chief Scientist Mike Hirshfield explains to CBS News in this clip:
For millions of years, sea turtles have been a vital part of ocean ecosystems – but today they are on the brink of extinction as a result of irresponsible fishing and habitat destruction, among other threats. We’re working our hardest to save them, but we need your support.
All six sea turtle species that swim in US waters threatened or endangered, but it’s not too late to save them. Donate today and join Oceana in the fight to protect sea turtles and restore ocean balance. With your donation, we will continue pushing for stronger fishing regulations and legislation that will help protect and sustain turtle populations for years to come.
Our goal is to raise $40,000, and we still have a long way to go. Please donate today to help us in the fight to save sea turtles from extinction. And if you’ve already given, thank you -- now pass the word on via Facebook, Twitter, and however else you can!
As DailyKos and the New York Times reported yesterday, melting sea ice has forced more than 10,000 walruses ashore in the Alaskan Arctic. Normally they rest on ice floes in the summer, periodically diving for food.
And this isn’t the first time. In fact, this is the third time in the last four years that the walruses have alarmingly turned into landlubbers.
Last week Oceana launched a new bluefin tuna PSA campaign featuring “Entourage” star Adrian Grenier. In March, Grenier joined Oceana to swim with the endangered fish and help get the word out that they are “going fast” -- literally and figuratively.
Bluefin can grow to 15 feet in length, weigh up to 1500 pounds and can swim at speeds of more than 50 miles per hour. They are on the verge of extinction as a result of overfishing, and the oil spill in the Gulf of Mexico further threatens their survival.
The Gulf is the only place where the Western population of Atlantic bluefin tuna reproduces. After the spawning season (April to June), baby tuna continue to swim through the Gulf region where they can accumulate toxins in their gills from the oil itself and from the chemical dispersants.
“I hope that my involvement will bring attention to what is going on in the bluefin fishery,” Grenier said. “I want these PSAs to encourage people to get involved and help Oceana save these amazing creatures.”
Watch the PSA and get involved with Adrian and Oceana to protect bluefin!
The study found that 85,000 sea turtles were reported caught by commercial fisheries worldwide over the last 20 years, but the scientists estimate that the actual number is two orders of magnitude higher than that -- in the millions.
The 85,000 figure only accounts for sea turtle bycatch that was reported, but the actual number of turtles caught is significantly higher because typically less than 1% of fleets have fishing observed and many small scale fisheries have no observer coverage at all.
The study looked at sea turtles caught by gillnets, longlines and trawls, three of the most commonly used fishing gear types. The bottom line here is that the number of sea turtles caught as bycatch is enormous. Without additional bycatch reduction and better enforcement of established protections, many sea turtle populations may go extinct.
- Reducing Bycatch Casualties, One Whale at a Time Posted Mon, April 14, 2014
- New York, the New Windy City? Posted Mon, April 14, 2014
- Drill, Spill, Repeat: Shining a Light on the BP Gulf Disaster 4 Years Later Posted Tue, April 15, 2014
- Hands Across the Sand Posted Wed, April 16, 2014