The Horizontal Distribution of Siliceous Planktonic Radiolarian Community in the Eastern Indian Ocean
| Autor: | Jun Sun, Sonia Munir, Xiaodong Zhang, Changling Ding, John Rogers |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Chlorophyll a
lcsh:Hydraulic engineering 010504 meteorology & atmospheric sciences Geography Planning and Development Equator acantharia RDA analysis Aquatic Science 01 natural sciences Biochemistry 03 medical and health sciences chemistry.chemical_compound Diversity index lcsh:Water supply for domestic and industrial purposes lcsh:TC1-978 collodaria Eastern Indian ocean taxopodida Dominance (ecology) natural sciences Transect 030304 developmental biology 0105 earth and related environmental sciences Water Science and Technology 0303 health sciences lcsh:TD201-500 biology fungi Community structure phaeodaria Plankton biology.organism_classification planktonic radiolarian polycystinea Oceanography chemistry Acantharia horizontal distribution Geology |
| Zdroj: | Water Volume 12 Issue 12 Water, Vol 12, Iss 3502, p 3502 (2020) |
| ISSN: | 2073-4441 |
| DOI: | 10.3390/w12123502 |
| Popis: | The plankton radiolarian community was investigated in the spring season during the two-month cruise &lsquo Shiyan1&lsquo (10 April&ndash 13 May 2014) in the Eastern Indian Ocean. This is the first comprehensive plankton tow study to be carried out from 44 sampling stations across the entire area (80.00° &ndash 96.10° E, 10.08° N&ndash 6.00° S) of the Eastern Indian Ocean. The plankton tow samples were collected from a vertical haul from a depth 200 m to the surface. During the cruise, conductivity&ndash temperature&ndash depth (CTD) measurements were taken of temperature, salinity and chlorophyll a from the surface to 200 m depth. Shannon&ndash Wiener&rsquo s diversity index (H&rsquo ) and the dominance index (Y) were used to analyze community structure. There was a total of 168 plankton species, composed of Acantharia, Phaeodaria, Polycystina, Collodaria and Taxopodida (monospecific&mdash Sticholonche zanclea, Hertwig is the only recognized species). Hence, it included both celestine-based and siliceous organisms, which are also described here for the first time from this region. Total radiolarians ranged from 5 to 5500 ind/m&minus 3, dominated by co-occurrences of Sphaerozoum punctatum and Stichonche zanclea species at the south-equator zone (SEQ)-transect 80° E and equator zone (EQ)-transect Lati-0. The possible environmental variables were tested through RDA analysis although no result was obtained for the full species dataset, the samples from the equatorial transect related strongly to mixed-layer chlorophyll a concentration and those of a north&ndash south transect to surface silicate concentrations or mixed-layer nitrate were significantly correlated (p < 0.01) to the radiolarian community. Our results indicate that the silicate and chlorophyll-a concentrations are the two major factors affecting the radiolarian distribution along two of the investigated transects (southern equator and equator) in the study area. |
| Databáze: | OpenAIRE |
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