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Summer distribution patterns of Trichodesmium spp. in the Changjiang (Yangtze River) Estuary and adjacent East China Sea shelf
- Source :
- Oceanologia, Vol 59, Iss 3, Pp 248-261 (2017)
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- Summary To examine the distribution of Trichodesmium relative to physicochemical factors during summer in the Changjiang (Yangtze River) Estuary and adjacent East China Sea shelf, three cruises were conducted separately in June 2009, July 2011, and August 2009. Trichodesmium species found were T. thiebautii , T. erythraeum , and T. hildebrandtii . The population was dominated by T. thiebautii , which accounted for >85% of the samples found. Most of them were free trichomes. Colonial forms were rarely observed (approximately 10% of our samples), occurring only in offshore waters. The depth integrated abundances of Trichodesmium were 308 × 10 3 , 1709 × 10 3 , and 3448 × 10 3 trichomes m −2 in June, July, and August, respectively. Trichodesmium was distributed abundantly in the southern or southeastern part of our study area, where nutrients were low and light penetration, temperature, and salinity were high, which were influenced by the Taiwan Warm Current (TWC) and Kuroshio. Trichodesmium was found in low abundance in inshore, eutrophic, low-salinity waters, which were mainly controlled by the Changjiang Diluted Water (CDW) and coastal current. These results suggest that spatiotemporal changes in the summer Trichodesmium distribution correlate highly with the variations in physicochemical properties that are primarily controlled by the TWC, Kuroshio, and CDW. The summer N 2 fixation rate of Trichodesmium was estimated at 12.3 μmol N m −2 d −1 in our study area, contributing >50% of biological N 2 fixation.
- Subjects :
- 0106 biological sciences
Atmospheric Science
010504 meteorology & atmospheric sciences
East China Sea
Population
Ocean Engineering
Aquatic Science
Oceanography
01 natural sciences
lcsh:Oceanography
Changjiang Estuary
Abundance (ecology)
lcsh:GC1-1581
education
Changjiang Diluted Water
0105 earth and related environmental sciences
education.field_of_study
geography
geography.geographical_feature_category
biology
010604 marine biology & hydrobiology
Biogeochemistry
Estuary
biology.organism_classification
Taiwan Warm Current
Salinity
Sea surface temperature
Trichodesmium
Kuroshio
Environmental science
Eutrophication
Subjects
Details
- ISSN :
- 00783234
- Volume :
- 59
- Database :
- OpenAIRE
- Journal :
- Oceanologia
- Accession number :
- edsair.doi.dedup.....ac7479bcf016f8d7ba10026637d33504