The Weekly Dive Vol. 61

Dive into the latest edition of The Weekly Dive, where we bring you the big ocean news!

Ocean’s deepest point teems with microbial life. Results from James Cameron’s recent expedition show that, although he couldn’t see any marine life when he reached the bottom of Challenger Deep, microscopic organisms abound in this extreme environment. [Treehugger]  

Overfishing large fish could cause genetic shift to smaller individuals. In lab tests, researchers showed that focusing fishing efforts on large individuals can trigger an evolutionary change that would have “serious global consequences” by causing fish to be smaller, and in turn less fertile. [BBC]  

Group of brown bears found to stem from ancient polar bears. Altering our understanding of polar bear genetic history (again) a new study has found that, around the time of the last Ice Age, one polar bear population reverted back to brown fur due to hybridization. This is prompting theories that this could happen again as a result of climate change. [CBC News] 

Melting Antarctic puts penguins at risk. Scientists have seen changes to penguin populations and expect at least half of penguin species to be negatively impacted if warming continues, largely because reduced ice also means reduced krill, which are the penguins’ food.  [The Huffington Post] 

Toxic red tide killing endangered manatees. So far this year, an algae bloom has killed a record 174 Florida manatees, which are considered Endangered throughout their range. [The Huffington Post] 

Marine plankton digest twice as much carbon as previously believed. A new study has upended a long-standing belief about how carbon dioxide enters the ocean, and indicates that existing ocean carbon models need revising. Single-celled marine algae, phytoplankton, show a latitudinal pattern and have much higher levels of carbon in the tropics than the poles. [Science Daily]   


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