Abundance and distribution of photosynthetic prokaryotic picoplankton in shelf waters of the Great Barrier Reef, Australia
Identifieur interne : 00C837 ( Main/Exploration ); précédent : 00C836; suivant : 00C838Abundance and distribution of photosynthetic prokaryotic picoplankton in shelf waters of the Great Barrier Reef, Australia
Auteurs : N. D. Crosbie [Australie] ; M. J. Furnas [Australie]Source :
- Bulletin de l'Institut océanographique : (Monaco) [ 0304-5722 ] ; 1999.
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Abstract
Abundances and distributions of Synechococcus and Prochlorococcus in shelf waters of the Great Barrier Reef (GBR) were studied on three cruises to a central GBR region (17°S; 4/94, 4/96 and 11/95) and two cruises to a southern GBR region (20°S; 2/96 and 4/97). For comparative purposes, two deep-water sites (depth > 100 m) were sampled in the Coral Sea just seaward of the shelf break. Synechococcus dominated standing stocks of photosynthetic prokaryotic picoplankton at most inshore and mid-shelf sites in the central GBR, and all sites in the southern GBR. In the central GBR, significant Prochlorococcus populations were confined to mid- and outer-shelf sites with weakly-mixed or stratified water columns of greater oceanic character. In central GBR shelf waters, relative abundances of Synechococcus and Prochlorococcus were significantly correlated (p < 0.001) with proxies of terrestrial influence and trophic status: salinity (r2 = (-) 0.64, n = 81), chlorophyll a (r2 = 0.48, n = 69) and DIN (r2 = 0.47, n = 81). Comparatively high SYN:PRO ratios were recorded at all southern GBR sites, including sites up to 180 km from the nearest coast. This was mostly due to reduced Prochlorococcus abundances. During the second cruise to the southern GBR (4/97), which followed shortly after a cyclone, depth-weighted mean SYN:PRO ratios at outer shelf sites (ca. 30) were more than three-fold greater than those measured during the first (2/96) cruise (< 10) under non-perturbed conditions. Again, high SYN:PRO ratios were due particularly to reduced or low Prochlorococcus abundances. Photoinhibition of Prochlorococcus growth rates and lower absolute growth rates of Prochlorococcus (compared to Synechococcus) in environments with greater microzooplankton grazing pressure are suggested to significantly contribute to low Prochlorococcus standing stocks.
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Le document en format XML
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<term>Environmental factor</term>
<term>Microbial activity</term>
<term>Microbial biomass</term>
<term>Nitrogen</term>
<term>Nutrient</term>
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<term>Population structure</term>
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<term>Spatial distribution</term>
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<term>Structure population</term>
<term>Biomasse microbienne</term>
<term>Répartition spatiale</term>
<term>Activité microbienne</term>
<term>Photosynthèse</term>
<term>Productivité biologique</term>
<term>Facteur milieu</term>
<term>Facteur trophique</term>
<term>Nutriment</term>
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<front><div type="abstract" xml:lang="en">Abundances and distributions of Synechococcus and Prochlorococcus in shelf waters of the Great Barrier Reef (GBR) were studied on three cruises to a central GBR region (17°S; 4/94, 4/96 and 11/95) and two cruises to a southern GBR region (20°S; 2/96 and 4/97). For comparative purposes, two deep-water sites (depth > 100 m) were sampled in the Coral Sea just seaward of the shelf break. Synechococcus dominated standing stocks of photosynthetic prokaryotic picoplankton at most inshore and mid-shelf sites in the central GBR, and all sites in the southern GBR. In the central GBR, significant Prochlorococcus populations were confined to mid- and outer-shelf sites with weakly-mixed or stratified water columns of greater oceanic character. In central GBR shelf waters, relative abundances of Synechococcus and Prochlorococcus were significantly correlated (p < 0.001) with proxies of terrestrial influence and trophic status: salinity (r<sup>2</sup>
= (-) 0.64, n = 81), chlorophyll a (r<sup>2</sup>
= 0.48, n = 69) and DIN (r<sup>2</sup>
= 0.47, n = 81). Comparatively high SYN:PRO ratios were recorded at all southern GBR sites, including sites up to 180 km from the nearest coast. This was mostly due to reduced Prochlorococcus abundances. During the second cruise to the southern GBR (4/97), which followed shortly after a cyclone, depth-weighted mean SYN:PRO ratios at outer shelf sites (ca. 30) were more than three-fold greater than those measured during the first (2/96) cruise (< 10) under non-perturbed conditions. Again, high SYN:PRO ratios were due particularly to reduced or low Prochlorococcus abundances. Photoinhibition of Prochlorococcus growth rates and lower absolute growth rates of Prochlorococcus (compared to Synechococcus) in environments with greater microzooplankton grazing pressure are suggested to significantly contribute to low Prochlorococcus standing stocks.</div>
</front>
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