Large-scale latitudinal distribution of Trichodesmium spp. in the Atlantic Ocean
作者： Toby Tyrrell , Emilio Marañón , Alex J Poulton , Andrew R Bowie , Derek S Harbour
关键词: Nitrate 、 Plankton 、 Chemical oceanography 、 Transect 、 Trichodesmium 、 Abundance (ecology) 、 Seawater 、 Oceanography 、 Biology 、 Mixed layer
摘要: The Atlantic Meridional Transect (AMT) programme is a series of bi-annual cruises between the Falkland Islands (50°S) and UK (50°N). Measurements abundance N2-fixing, colonial cyanobacterium Trichodesmium along this transect in years 1995–1999 reveal that it especially abundant 0 15°N, but by contrast almost completely absent 5 30°S. cruise path 15°N lies close to 20°W, on African (eastern) side Atlantic. maximum colony abundances we observed (100 000 colonies m–2) are greater than those reported many other studies. results different methods for assessing compared. Possible correlations several physical chemical variables were examined try elucidate factors controlling N2 fixer occurrence. High was found be correlated with shallow mixed layer depth high estimated iron deposition surface ocean, not temperature, nitrate or concentration total dissolvable sea water.
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