scholarly journals The Horizontal Distribution of Siliceous Planktonic Radiolarian Community in the Eastern Indian Ocean

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3502
Author(s):  
Sonia Munir ◽  
John Rogers ◽  
Xiaodong Zhang ◽  
Changling Ding ◽  
Jun Sun
Keyword(s):  
Indian Ocean ◽  
Chlorophyll A ◽  
Mixed Layer ◽  
Diversity Index ◽  
Horizontal Distribution ◽  
Eastern Indian Ocean ◽  
Entire Area ◽  
Factors Affecting ◽  
Major Factors ◽  
First Time

The plankton radiolarian community was investigated in the spring season during the two-month cruise ‘Shiyan1’ (10 April–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°–96.10° E, 10.08° N–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–temperature–depth (CTD) measurements were taken of temperature, salinity and chlorophyll a from the surface to 200 m depth. Shannon–Wiener’s diversity index (H’) 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—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−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–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.

Filling missing links in albuneid crab distributions (superfamily Hippoidea) in the Bay of Bengal, eastern Indian Ocean

Crustaceana ◽  
2018 ◽  
Vol 91 (12) ◽  
pp. 1495-1504 ◽  
Author(s):  
Rajan Kumar ◽  
Shikha Rahangdale ◽  
Subal Kumar Roul
Keyword(s):  
Indian Ocean ◽  
Bay Of Bengal ◽  
Morphological Characters ◽  
Eastern Indian Ocean ◽  
Species Discrimination ◽  
Gulf Of Mannar ◽  
Fishing Gear ◽  
Morphometric Characters ◽  
First Time

Abstract Albuneid crabs are specialized and active sand-burrowing organisms. Despite their substantial diversity, their ability to avoid fishing gear leads to “under collection” and a discontinuous record of distribution. The present study documents the first distributional record of Albunea occulta Boyko, 2002 from the Bay of Bengal, eastern Indian Ocean. Albunea thurstoni Henderson, 1893 is also recorded for the first time from the area, i.e., from the Gulf of Mannar, southwestern Bay of Bengal. This study further reports variation in morphological characters, especially in the carapace grooves (CG) from previous records and across specimens from different regions. Morphometric characters were found useful in species discrimination, which is explained as well.

scholarly journals VARIABILITY OF SEA SURFACE TEMPERATURE (SST) AND CHLOROPHYLL-A (CHL-A) CONCENTRATIONS IN THE EASTERN INDIAN OCEAN DURING THE PERIOD 2002–2017

2019 ◽  
Vol 16 (1) ◽  
pp. 55
Author(s):  
Michelia Mashita ◽  
Jonson Lumban-Gaol
Keyword(s):  
Indian Ocean ◽  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Chlorophyll A ◽  
Sea Surface ◽  
Asia Pacific ◽  
Eastern Indian Ocean ◽  
Positive Anomaly ◽  
Chl A ◽  
Annual Variability

We analysed the variability of sea surface temperature (SST) and chlorophyll-a concentration (Chl-a) in the eastern Indian Ocean (EIO). We used monthly mean Chl-a and SST data with a 4-km spatial resolution derived from Level-3 Aqua Moderate-resolution Imaging Spectroradiometer (MODIS) distributed by the Asia-Pacific Data-Research Center (APDRC) for the period 2002–2017. Wavelet analysis shows the annual and interannual variability of SST and Chl-a concentration in the EIO. The annual variability of SST and Chl-a is influenced by monsoon systems. During a southeast monsoon, SST falls while Chl-a increases due to upwelling. The annual variability of SST and Chl-a is also influenced by the Indian Ocean Dipole (IOD). During positive phases of the IOD (2006, 2012 and 2015), there was more intense upwelling in the EIO caused by the negative anomaly of SST and the positive anomaly of Chl-a concentration.

The distribution of chlorophyll a in the tropical eastern Indian Ocean in austral summer

2012 ◽  
Vol 31 (5) ◽  
pp. 146-159 ◽  
Author(s):  
Lisha Hong ◽  
Chunsheng Wang ◽  
Yadong Zhou ◽  
Mianrun Chen ◽  
Hongbin Liu ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Chlorophyll A ◽  
Austral Summer ◽  
Eastern Indian Ocean

In-water algorithms for estimation of chlorophyll a and primary production in the Arabian Sea and the eastern Indian Ocean

1997 ◽  
Author(s):  
Toru Hirawake ◽  
Hiroo Satoh ◽  
Tsutomu Morinaga ◽  
Takashi Ishimaru ◽  
Motoaki Kishino
Keyword(s):  
Indian Ocean ◽  
Primary Production ◽  
Chlorophyll A ◽  
Arabian Sea ◽  
Eastern Indian Ocean

scholarly journals Subsurface oceanic structure associated with atmospheric convectively coupled equatorial Kelvin waves in the eastern Indian Ocean

2021 ◽  
Author(s):  
Marina Azaneu ◽  
Adrian Matthews ◽  
Dariusz Baranowski
Keyword(s):  
Indian Ocean ◽  
Mixed Layer ◽  
Mixed Layer Depth ◽  
Phase Speed ◽  
Heat Content ◽  
Life Cycles ◽  
Kelvin Waves ◽  
Eastern Indian Ocean ◽  
Dynamical Response ◽  
Ocean Atmosphere

&lt;p&gt;Atmospheric convectively coupled equatorial Kelvin waves (CCKWs) are a major tropical weather feature strongly influenced by ocean--atmosphere interactions. However, prediction of the development and propagation of CCKWs remains a challenge for models. The physical processes involved in these interactions are assessed by investigating the oceanic response to the passage of CCKWs across the eastern Indian Ocean and MC using the NEMO ocean model analysis with data assimilation. Three-dimensional life cycles are constructed for &quot;solitary&quot; CCKW events. As a CCKW propagates over the eastern Indian Ocean, the immediate thermodynamic ocean response includes cooling of the ocean surface and subsurface, deepening of the mixed layer depth, and an increase in the mixed layer heat content. Additionally, a dynamical downwelling signal is observed two days after the peak in the CCKW westerly wind burst, which propagates eastward along the Equator and then follows the Sumatra and Java coasts, consistent with a downwelling oceanic Kelvin wave with an average phase speed of 2.3 m s&lt;sup&gt;-1&lt;/sup&gt;. Meridional and vertical structures of zonal velocity anomalies are consistent with this framework. This dynamical feature is consistent across distinct CCKW populations, indicating the importance of CCKWs as a source of oceanic Kelvin waves in the eastern Indian Ocean. The subsurface dynamical response to the CCKWs is identifiable up to 11 days after the forcing. These ocean feedbacks on time scales longer than the CCKW life cycle help elucidate how locally driven processes can rectify onto longer time-scale processes in the coupled ocean--atmosphere system.&lt;/p&gt;

scholarly journals Mixed layer temperature balance in the eastern Indian Ocean during the 2006 Indian Ocean dipole

2009 ◽  
Vol 114 (C7) ◽  
Author(s):  
Takanori Horii ◽  
Yukio Masumoto ◽  
Iwao Ueki ◽  
Hideaki Hase ◽  
Keisuke Mizuno
Keyword(s):  
Indian Ocean ◽  
Mixed Layer ◽  
Indian Ocean Dipole ◽  
Eastern Indian Ocean ◽  
Mixed Layer Temperature

scholarly journals First record of an exotic hippolytid shrimp in the eastern Mediterranean Sea

2013 ◽  
Vol 15 (1) ◽  
pp. 168 ◽  
Author(s):  
C. FROGLIA ◽  
M.C. DEVAL
Keyword(s):  
Indian Ocean ◽  
Mediterranean Sea ◽  
Eastern Mediterranean ◽  
Original Description ◽  
First Record ◽  
Eastern Indian Ocean ◽  
Eastern Mediterranean Sea ◽  
First Time

The alien hippolytid shrimp Lysmatakempi Chace, 1997 (= Hippolysmatadentata Kemp, 1914) , never recorded after its original description fromthe Eastern Indian Ocean, is reported for the first time in the easternMediterranean Sea (Gulf of Antalya), with remarks on its taxonomy.

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