Sentences with phrase «cause plankton populations»

Not exact matches

Mussels have caused high mortality in native Unionid clams (though some clams seem able to coexist with zebra mussels), altered the makeup of populations living at the bottom of the waterways and reduced plankton communities.

Other aspects of global warming's broad footprint on the world's ecosystems include changes in the abundance of more than 80 percent of the thousands of species included in population studies; major poleward shifts in living ranges as warm regions become hot, and cold regions become warmer; major increases (in the south) and decreases (in the north) of the abundance of plankton, which forms the critical base of the ocean's food chain; the transformation of previously innocuous insect species like the Aspen leaf miner into pests that have damaged millions of acres of forest; and an increase in the range and abundance of human pathogens like the cholera - causing bacteria Vibrio, the mosquito - borne dengue virus, and the ticks that carry Lyme disease - causing bacteria.

Obvious question: Is the excess CO2 problem caused by humans or the fact that plankton population is diminished (I understand that the plankton population may also be affected by human behavior).