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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Furnas</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Australian Institute of Marine Science, PMB No. 3 Townsville MC</s1><s2>Queensland, 4810</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Queensland, 4810</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">00-0054612</idno><date when="1999">1999</date><idno type="stanalyst">PASCAL 00-0054612 INIST</idno><idno type="RBID">Pascal:00-0054612</idno><idno type="wicri:Area/PascalFrancis/Corpus">006086</idno><idno type="wicri:Area/PascalFrancis/Curation">000084</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">006153</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">006153</idno><idno type="wicri:doubleKey">0304-5722:1999:Crosbie N:abundance:and:distribution</idno><idno type="wicri:Area/Main/Merge">00D866</idno><idno type="wicri:Area/Main/Curation">00C837</idno><idno type="wicri:Area/Main/Exploration">00C837</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Abundance and distribution of photosynthetic prokaryotic picoplankton in shelf waters of the Great Barrier Reef, Australia</title><author><name sortKey="Crosbie, N D" sort="Crosbie, N D" uniqKey="Crosbie N" first="N. D." last="Crosbie">N. D. Crosbie</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Australian Institute of Marine Science, PMB No. 3 Townsville MC</s1><s2>Queensland, 4810</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Queensland, 4810</wicri:noRegion></affiliation></author><author><name sortKey="Furnas, M J" sort="Furnas, M J" uniqKey="Furnas M" first="M. J." last="Furnas">M. J. Furnas</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Australian Institute of Marine Science, PMB No. 3 Townsville MC</s1><s2>Queensland, 4810</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Queensland, 4810</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Bulletin de l'Institut océanographique : (Monaco)</title><title level="j" type="abbreviated">Bull. Inst. océanogr. : (Monaco)</title><idno type="ISSN">0304-5722</idno><imprint><date when="1999">1999</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Bulletin de l'Institut océanographique : (Monaco)</title><title level="j" type="abbreviated">Bull. Inst. océanogr. : (Monaco)</title><idno type="ISSN">0304-5722</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Australia</term><term>Bacterioplankton</term><term>Biological productivity</term><term>Coral Sea</term><term>Coral reef</term><term>Environmental factor</term><term>Microbial activity</term><term>Microbial biomass</term><term>Nitrogen</term><term>Nutrient</term><term>Photosynthesis</term><term>Population structure</term><term>Salinity</term><term>Spatial distribution</term><term>Synechococcus</term><term>Temperature</term><term>Trophic factor</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Synechococcus</term><term>Bactérioplancton</term><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><term>Azote</term><term>Salinité</term><term>Température</term><term>Récif corallien</term><term>Mer de Corail</term><term>Australie</term><term>Prochlorococcus</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Australie</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Azote</term></keywords></textClass></profileDesc></teiHeader><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></TEI><affiliations><list><country><li>Australie</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Crosbie, N D" sort="Crosbie, N D" uniqKey="Crosbie N" first="N. D." last="Crosbie">N. D. Crosbie</name></noRegion><name sortKey="Furnas, M J" sort="Furnas, M J" uniqKey="Furnas M" first="M. J." last="Furnas">M. J. Furnas</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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