Peatland – A burning issue - Farming Life

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Friday, May 29, 2020

The most common organism in the oceans harbors a virus in its DNA

The most common organism in the oceans, and possibly on the entire planet, is a family of single-celled marine bacteria called SAR11. These drifting organisms look like tiny jelly beans and have evolved to outcompete other bacteria for scarce resources in the oceans.

We now know that this group of organisms thrives despite -- or perhaps because of -- the ability to host viruses in their DNA. A study published in May in Nature Microbiology could lead to new understanding of viral survival strategies.

University of Washington oceanographers discovered that the bacteria that dominate seawater, known as Pelagibacter or SAR11, hosts a unique virus. The virus is of a type that spends most of its time dormant in the host's DNA but occasionally erupts to infect other cells, potentially carrying some of its host's genetic material along with it.

"Many bacteria have viruses that exist in their genomes. But people had not found them in the ocean's most abundant organisms," said co-lead author Robert Morris, a UW associate professor of oceanography. "We suspect it's probably common, or more common than we thought -- we just had never seen it."

This virus' two-pronged survival strategy differs from similar ones found in other organisms. The virus lurks in the host's DNA and gets copied as cells divide, but for reasons still poorly understood, it also replicates and is released from other cells.

The new study shows that as many as 3% of the SAR11 cells can have the virus multiply and split, or lyse, the cell -- a much higher percentage than for most viruses that inhabit a host's genome. This produces a large number of free viruses and could be key to its survival.

"There are 10 times more viruses in the ocean than there are bacteria," Morris said. "Understanding how those large numbers are maintained is important. How does a virus survive? If you kill your host, how do you find another host before you degrade?"

The study could prompt basic research that could help clarify host-virus interactions in other settings.

"If you study a system in bacteria, that is easier to manipulate, then you can sort out the basic mechanisms," Morris said. "It's not too much of a stretch to say it could eventually help in biomedical applications."

The UW oceanography group had published a previous paper in 2019 looking at how marine phytoplankton, including SAR11, use sulfur. That allowed the researchers to cultivate two new strains of the ocean-dwelling organism and analyze one strain, NP1, with the latest genetic techniques.

Co-lead author Kelsy Cain collected samples off the coast of Oregon during a July 2017 research cruise. She diluted the seawater several times and then used a sulfur-containing substance to grow the samples in the lab -- a difficult process, for organisms that prefer to exist in seawater.

The team then sequenced this strain's DNA at the UW PacBio sequencing center in Seattle.

"In the past we got a full genome, first try," Morris said. "This one didn't do that, and it was confusing because it's a very small genome."

The researchers found that a virus was complicating the task of sequencing the genome. Then they discovered a virus wasn't just in that single strain.

"When we went to grow the NP2 control culture, lo and behold, there was another virus. It was surprising how you couldn't get away from a virus," said Cain, who graduated in 2019 with a UW bachelor's in oceanography and now works in a UW research lab.

Cain's experiments showed that the virus' switch to replicating and bursting cells is more active when the cells are deprived of nutrients, lysing up to 30% of the host cells. The authors believe that bacterial genes that hitch a ride with the viruses could help other SAR11 maintain their competitive advantage in nutrient-poor conditions.

"We want to understand how that has contributed to the evolution and ecology of life in the oceans," Morris said.

Story Source:

Materials provided by University of Washington. Original written by Hannah Hickey. Note: Content may be edited for style and length.



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Oceans away  Pique Newsmagazine

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Oceans away - Pique Newsmagazine

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Mumbai goes loco over locusts - The Tribune India

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Commitment to regrow forestry - Tumut and Adelong Times

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Women live off the mangroves - Fiji Times

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Biden keys in on Keystone - POLITICO - Politico

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Saturday, May 23, 2020

Tackle climate change like the virus - Sydney Morning Herald

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Indigenous collaboration and leadership key to managing sea otter population recovery

A new study highlights the need to engage Indigenous communities in managing sea otter population recovery to improve coexistence between humans and this challenging predator.

The sea otters' recovery along the northwest coast of North America presents a challenge for coastal communities because both otters and humans like to eat shellfish, such as sea urchins, crabs, clams and abalone. Expanding populations of sea otters and their arrival in new areas are heavily impacting First Nations and Tribes that rely on harvesting shellfish.

SFU lead author Jenn Burt says the study focused beyond the challenges to seek solutions going forward. "We documented Indigenous peoples' perspectives which illuminated key strategies to help improve sea otter management and overall coexistence with sea otters."

Most research focuses on how sea otter recovery greatly reduces shellfish abundance or expands kelp forests, rather than on how Indigenous communities are impacted, or how they are adapting to the returning sea otters' threat to their food security, cultural traditions, and livelihoods.

Recognizing that Indigenous perspectives were largely absent from dialogues about sea otter recovery and management, SFU researchers reached out to initiate the Coastal Voices collaboration.

Coastal Voices is a partnership with Indigenous leaders and knowledge holders representing 19 First Nations and Tribes from Alaska to British Columbia.

Based on information revealed in workshops, interviews, and multiple community surveys, SFU researchers and collaborating Indigenous leaders found that human-otter coexistence can be enabled by strengthening Indigenous governance authority and establishing locally designed, adaptive co-management plans for sea otters.

The study, published this week in People and Nature also suggests that navigating sea otter recovery can be improved by incorporating Indigenous knowledge into sea otter management plans, and building networks and forums for community discussions about sea otter and marine resource management.

"Our people actively managed a balanced relationship with sea otters for millennia," says co-author and Haida matriarch Kii'iljuus (Barbara Wilson), a recent SFU alumnus.

"Our work with Coastal Voices and this study helps show how those rights and knowledge need to be recognized and be part of contemporary sea otter management."

Anne Salomon, a professor in SFU's School of Resource and Environmental Management, co-authored the study and co-led the Coastal Voices research partnership.

"This research reveals that enhancing Indigenous people's ability to coexist with sea otters will require a transformation in the current governance of fisheries and marine spaces in Canada, if we are to navigate towards a system that is more ecologically sustainable and socially just," says Salomon.

Despite challenges, the authors say transformation is possible. They found that adaptive governance and Indigenous co-management of marine mammals exist in other coastal regions in northern Canada and the U.S. They suggest that increasing Indigenous leadership and Canadian government commitments to Reconciliation may provide opportunities for new approaches and more collaborative marine resource management.

Story Source:

Materials provided by Simon Fraser University. Note: Content may be edited for style and length.



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Together Apart - Orion Magazine

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Friday, May 22, 2020

Thursday, May 21, 2020

A bridge for tomorrow - National Geographic

A bridge for tomorrow  National Geographic

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