File:Phytoplankton.jpg

https://en.wikipedia.org/wiki/Diatom

Phytoplankton account for half of all photosynthetic activity on Earth...

Phytoplankton are responsible for much of the oxygen present in the Earth’s atmosphere – half of the total amount produced by all plant life.

http://en.wikipedia.org/wiki/Phytoplankton

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Marine Biodiversity Strongly Linked to Ocean Temperature

ScienceDaily / 2010 — In an unprecedented effort published online by the international journal Nature, a team of scientists mapped and analyzed global biodiversity patterns for over 11,000 marine species ranging from tiny plankton to sharks and whales.

The researchers found striking similarities among the distribution patterns, with temperature strongly linked to biodiversity for all thirteen groups studied. These results imply that future changes in ocean temperature, such as those due to climate change, may greatly affect the distribution of life in the sea.

http://www.sciencedaily.com/releases/2010/07/100728131707.htm

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Phytoplankton obtain energy through the process of photosynthesis and must therefore live in the well-lit surface layer (termed the euphotic zone) of an ocean, sea, lake, or other water...

Plankton

2015 - Big Trouble Ahead for Ocean Plankton

Sobering news: Ocean acidification will likely kill off some phytoplankton species and let others thrive, while warming waters will likely cause mass phytoplankton migrations toward the poles. In short: The base of the marine food web could be in for some serious upheaval in the coming decades. Here’s more from MIT News:

“I’ve always been a total believer in climate change, and I try not to be an alarmist, because it’s not good for anyone,” says (Dr. Stephanie) Dutkiewicz, who is the paper’s lead author. “But I was actually quite shocked by the results. The fact that there are so many different possible changes, that different phytoplankton respond differently, means there might be some quite traumatic changes in the communities over the course of the 21st century. A whole rearrangement of the communities means something to both the food web further up, but also for things like cycling of carbon.”

Dutkiewicz and her colleagues studied 154 published experiments...