Navigation Links
Preserving 4 percent of the ocean could protect most marine mammal species, study finds

Preserving just 4 percent of the ocean could protect crucial habitat for the vast majority of marine mammal species, from sea otters to blue whales, according to researchers at Stanford University and the National Autonomous University of Mexico. Their findings were published in the Aug. 16 edition of the Proceedings of the National Academy of Sciences.

Of the 129 species of marine mammals on Earth, including seals, dolphins and polar bears, approximately one-quarter are facing extinction, the study said.

"It's important to protect marine mammals if you want to keep the ocean's ecosystems functional," said study co-author Paul Ehrlich, professor of biology and senior fellow at the Woods Institute for the Environment at Stanford. "Many of them are top predators and have impacts all the way through the ecosystem. And they're also beautiful and interesting."

Mapping marine mammals

To pinpoint areas of the ocean where conservation could protect the maximum number of species and the ones most vulnerable to extinction, the researchers overlaid maps of where each marine mammal species is found. Their composite map revealed locations with the highest "species richness" the highest number of different species.

"This is the first time that the global distribution of marine mammal richness has been compiled and presented as a map," said co-authors Sandra Pompa and Gerardo Ceballos of the National Autonomous University of Mexico. "The most surprising and interesting result was that all of the species can be represented in only 20 critical conservation locations that cover at least 10 percent of the species' geographic range."

The researchers identified the 20 conservation sites based on three main criteria: how many species were present, how severe the risk of extinction was for each species and whether any of the species were unique to the area. The scientists also considered habitats of special importance to marine mammals, such as breeding grounds and migration routes.

Nine key sites

It turned out that preserving just nine of the 20 conservation sites would protect habitat for 84 percent of all marine mammal species on Earth, the scientists found. That's because those nine locations have very high species richness, providing habitat for 108 marine mammal species in all.

These nine sites, which make up only 4 percent of the world's ocean, are located off the coasts of Baja California in Mexico, eastern Canada, Peru, Argentina, northwestern Africa, South Africa, Japan, Australia and New Zealand, the study reported.

The researchers also looked at how pollution, local climate disruption and commercial shipping overlapped with species richness in or near the nine key sites. "At least 70 percent of the richness areas coincide with regions highly impacted by humans," said Pompa and Ceballos. "This is powerful information that obliges us to enhance marine conservation."

Factoring in other impacts, such as overfishing and global climate change, would likely reveal even more negative effects on the nine conservation sites, the authors said.

"The next 2 billion people we're going to add to the planet are going to do much more damage to the ocean than the previous 2 billion did," said Ehrlich, president of the Stanford Center for Conservation Biology. "Humans reach for the low-hanging fruit first, so to speak, but for the ocean that's gone now."

Unique creatures

While nine of the conservation sites harbor numerous marine mammal species, the remaining 11 sites boast species found nowhere else. Preserving these areas is important, because species that live exclusively in one place may be at especially high risk for extinction, the authors said. For example, the critically endangered vaquita, or gulf porpoise, lives only in the upper northern Gulf of California, and only a few hundred individuals remain, the researchers noted.

"We need to conserve what's left of the biota of the planet, both on land and in the sea," said Ehrlich. "We need to know where the biodiversity is before we can take many of the necessary steps to conserve it. This is just a start on the mammals of the sea."


Contact: Mark Shwartz
Stanford University

Related biology news :

1. Benchmarking a slice of Africa; preserving biodiversity through science
2. Preserving a world favorite flavour
3. Preserving sperm vital to saving snot otter salamanders
4. Alpine rivers hold important clues for preserving biodiversity and coping with climate change
5. Study aims to improve fuel economy by 30 percent
6. 70 percent of 8-month-olds consume too much salt
7. First global study of real-world circumcision rollout conducted over 3-year period in South Africa amongst 110,000 adults shows a marked reduction (>60 percent) of HIV acquisition among circumcised adult men
8. Scripps study finds plastic in 9 percent of garbage patch fishes
9. New solar product captures up to 95 percent of light energy
10. More than 20 percent of atheist scientists are spiritual
11. High percentage of omega-3s in the blood may boost risk of aggressive prostate cancer
Post Your Comments:
Related Image:
Preserving 4 percent of the ocean could protect most marine mammal species, study finds
(Date:10/8/2015)... , Oct. 8, 2015 Synaptics Inc. (NASDAQ: ... interface solutions, announced today that it will report ... 2016 on Thursday, October 22, 2015, after the ... corresponding conference call for analysts and investors at ... management may discuss forward-looking information.    ...
(Date:10/7/2015)... October 7, 2015 NXTD ) ... on the growing mobile commerce market and creator of ... Washington , former long- term executive at American Express ... --> NXTD ) ("NXT-ID" or the "Company"), a ... market and creator of the Wocket® smart wallet announces ...
(Date:10/2/2015)... , Oct. 02 2015 ... of the "Enforcing the Law Using Biometrics" ... ) has announced the addition of the ... to their offering. --> Research and ... of the "Enforcing the Law Using Biometrics" ...
Breaking Biology News(10 mins):
(Date:10/13/2015)... the United States , Canada ... 14% of all new cases of kidney cancer.   --> ... and Europe .  PRCC represents about 14% ... Hutchison China MediTech Limited ("Chi-Med") (AIM: HCM) today announces that Hutchison ... ("AstraZeneca") have completed enrolment in a global Phase II study of ...
(Date:10/12/2015)... Group, Inc. (NASDAQ: MDXG ), the leading regenerative ... to develop and market advanced products and therapies for ... and the Dental sectors of healthcare, announced today the ... Company has been dismissed by the court.  ... "As we suspected, this case was brought by an ...
(Date:10/12/2015)... , October 12, 2015 cell ... 6.49 billion by 2022, according to a new report by ... attributed to rise in incidence of oncology diseases and other ... is expected to reach USD 6.49 billion by 2022, ... This growth in demand can be attributed to rise in ...
(Date:10/12/2015)... 2015  Patara Pharma, a clinical-stage biotechnology company ... and conditions, today announced the closing of a ... with the close of its sale of preferred ... Security Agreement with Silicon Valley Bank whereby the ... will use the funds from the financing to ...
Breaking Biology Technology: