之前的推理错了?二氧化碳排放增多使海洋藻类急剧增长

【之前的推理错了?二氧化碳排放增多使海洋藻类急剧增长】早期的研究和推测都认为,二氧化碳排放增多使海洋呈现酸性,不利于藻类繁殖,但霍普金斯大学的研究人员发现,1965年到2010年,藻类数量不断增长,1990年代更是急剧增长。大量的藻类增长有利于海洋生物的繁殖和生长。

Rising CO2 levels lead to increase in plankton

1128-Plankton

Although researchers have often theorized that plankton species would decline as a result of more acidic oceans, the exact opposite has been happening in the last four decades, according to a new study.

The study, which was led by Johns Hopkins University researchers, shows that coccolithophores, or single-celled algae with a distinct limestone shell feature, have become ten times more prevalent between

1965 and 2010. This type of plankton, in addition, has seen its numbers rise dramatically since the late 1990s. As the researchers noted, something “strange” appears to be happening in our oceans.

Researchers analyzed survey figures from the Continuous Plankton Recorder, covering data from the North Atlantic Ocean and North Sea, dating back to the mid-‘60s. The analysis, unfortunately, showed that increased levels of carbon dioxide in our oceans may be the culprit behind the big jump in coccolithophore population.

“Our statistical analyses on field data from the CPR point to carbon dioxide as the best predictor of the increase in coccolithophores,” said study lead Sara Rivero-Calle, a Johns Hopkins doctoral student. “The consequences of releasing tons of CO2 over the years are already here and this is just the tip of the iceberg.”

Co-author William Balch of the Bigelow Laboratory for Ocean Sciences stressed that it was long believed that the continued acidification of oceans due to higher carbon dioxide would prove deadly to coccolithophores. That hasn’t been the case after all.

“Coccolithophores have been typically more abundant during Earth’s warm interglacial and high CO2 periods,” Balch explained. “The results presented here are consistent with this and may portend, like the ‘canary in the coal mine,’ where we are headed climatologically.”

Taking everything into consideration, the researchers believe that the report is positive for sea creatures who eat coccolithophores. They added a caveat, however, that they aren’t sure whether this huge plankton spike will have a positive or negative impact on planet Earth.

链接:http://www.modernreaders.com/rising-co2-levels-lead-to-increase-in-plankton/34664/melissa-taylor


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