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Large-scale latitudinal distribution of Trichodesmium spp. in the Atlantic Ocean

Large-scale latitudinal distribution of Trichodesmium spp. in the Atlantic Ocean
Large-scale latitudinal distribution of Trichodesmium spp. in the Atlantic Ocean
The Atlantic Meridional Transect (AMT) programme is a series of bi-annual cruises between the Falkland Islands (50°S) and the UK (50°N). Measurements of the abundance of the N2-fixing, colonial cyanobacterium Trichodesmium along this transect in the years 1995–1999 reveal that it is especially abundant between 0 and 15°N, but by contrast almost completely absent between 5 and 30°S. The cruise path between 0 and 15°N lies close to 20°W, on the African (eastern) side of the Atlantic. The maximum colony abundances we observed (100 000 colonies m–2) are greater than those reported in many other studies. The results of different methods for assessing Trichodesmium abundance are compared. Possible correlations between Trichodesmium abundance and several physical and chemical variables were examined to try and elucidate the factors controlling N2 fixer occurrence. High Trichodesmium abundance was found to be correlated with shallow mixed layer depth and high estimated iron deposition to the surface ocean, but not with temperature, nitrate or the concentration of total dissolvable iron in sea water.
GEOGRAPHICAL DISTRIBUTION, ABUNDANCE, CYANOBACTERIA, BIOLOGY
0142-7873
405-416
Tyrrell, T.
6808411d-c9cf-47a3-88b6-c7c294f2d114
Maranon, E.
e0e574e3-c100-4772-a003-4213027c818d
Poulton, A.J.
14bf64a7-d617-4913-b882-e8495543e717
Bowie, A.R.
9e60fe12-98c0-4ea7-9c2f-126a997a9f7b
Harbour, D.S.
f8f61da9-b320-45b2-aaff-fa5993852456
Woodward, E.M.S.
3ac3b98f-78c7-4b43-acf9-bba3253752b5
Tyrrell, T.
6808411d-c9cf-47a3-88b6-c7c294f2d114
Maranon, E.
e0e574e3-c100-4772-a003-4213027c818d
Poulton, A.J.
14bf64a7-d617-4913-b882-e8495543e717
Bowie, A.R.
9e60fe12-98c0-4ea7-9c2f-126a997a9f7b
Harbour, D.S.
f8f61da9-b320-45b2-aaff-fa5993852456
Woodward, E.M.S.
3ac3b98f-78c7-4b43-acf9-bba3253752b5

Tyrrell, T., Maranon, E., Poulton, A.J., Bowie, A.R., Harbour, D.S. and Woodward, E.M.S. (2003) Large-scale latitudinal distribution of Trichodesmium spp. in the Atlantic Ocean. Journal of Plankton Research, 25 (4), 405-416.

Record type: Article

Abstract

The Atlantic Meridional Transect (AMT) programme is a series of bi-annual cruises between the Falkland Islands (50°S) and the UK (50°N). Measurements of the abundance of the N2-fixing, colonial cyanobacterium Trichodesmium along this transect in the years 1995–1999 reveal that it is especially abundant between 0 and 15°N, but by contrast almost completely absent between 5 and 30°S. The cruise path between 0 and 15°N lies close to 20°W, on the African (eastern) side of the Atlantic. The maximum colony abundances we observed (100 000 colonies m–2) are greater than those reported in many other studies. The results of different methods for assessing Trichodesmium abundance are compared. Possible correlations between Trichodesmium abundance and several physical and chemical variables were examined to try and elucidate the factors controlling N2 fixer occurrence. High Trichodesmium abundance was found to be correlated with shallow mixed layer depth and high estimated iron deposition to the surface ocean, but not with temperature, nitrate or the concentration of total dissolvable iron in sea water.

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More information

Published date: 2003
Keywords: GEOGRAPHICAL DISTRIBUTION, ABUNDANCE, CYANOBACTERIA, BIOLOGY

Identifiers

Local EPrints ID: 2105
URI: https://eprints.soton.ac.uk/id/eprint/2105
ISSN: 0142-7873
PURE UUID: 664794a0-553c-4c63-b78e-4fc87614f609
ORCID for T. Tyrrell: ORCID iD orcid.org/0000-0002-1002-1716

Catalogue record

Date deposited: 11 May 2004
Last modified: 06 Jun 2018 13:03

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