GROWTH OF PROCHLOROCOCCUS, A PHOTOSYNTHETIC PROKARYOTE, IN THE EQUATORIAL PACIFIC-OCEAN

被引:305
作者
VAULOT, D
MARIE, D
OLSON, RJ
CHISHOLM, SW
机构
[1] UNIV PARIS 06, F-29682 ROSCOFF, FRANCE
[2] WOODS HOLE OCEANOG INST, DEPT BIOL, WOODS HOLE, MA 02543 USA
[3] MIT, DEPT CIVIL & ENVIRONM ENGN, CAMBRIDGE, MA 02139 USA
关键词
D O I
10.1126/science.268.5216.1480
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The cell cycle of Prochlorococcus, a prokaryote that accounts for a sizable fraction of the photosynthetic biomass in the eastern equatorial Pacific, progressed in phase with the daily light cycle. DNA replication occurred in the afternoon and cell division occurred at night. Growth rates were maximal (about one doubling per day) at 30 meters and decreased toward the surface and the bottom of the ocean. Estimated Prochlorococcus production varied between 174 and 498 milligrams of carbon per square meter per day and accounted for 5 to 19 percent of total gross primary production at the equator. Because Prochlorococcus multiplies close to its maximum possible rate, it is probably not severely nutrient-limited in this region of the oceans.
引用
收藏
页码:1480 / 1482
页数:3
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