scholarly journals Interannual variation and spatial distribution of decapod larvae in a region of persistent coastal upwelling

2018 ◽  
Vol 587 ◽  
pp. 55-71 ◽  
Author(s):  
SO Hameed ◽  
ML Elliott ◽  
SG Morgan ◽  
J Jahncke
Keyword(s):  
Spatial Distribution ◽  
Interannual Variation ◽  
Coastal Upwelling ◽  
Decapod Larvae

scholarly journals Controlling factors of the OMZ in the Arabian Sea

2012 ◽  
Vol 9 (5) ◽  
pp. 5509-5550
Author(s):  
L. Resplandy ◽  
M. Lévy ◽  
L. Bopp ◽  
V. Echevin ◽  
S. Pous ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Oxygen Concentration ◽  
Seasonal Cycle ◽  
Arabian Sea ◽  
Coastal Upwelling ◽  
Western Boundary ◽  
Ekman Pumping ◽  
Low Oxygen ◽  
Boundary Current ◽  
Ocean Dynamic

Abstract. In-situ observations indicate that the Arabian Sea oxygen minimum zone (OMZ) is only weakly influenced by the strong seasonal cycle of ocean dynamic and biogeochemistry forced by the asian monsoon system and it is spatially decorrelated from the coastal upwelling systems where the biological production is the strongest. In this study we examine the factors controlling the seasonality and the spatial distribution of the OMZ in the Arabian Sea using a coupled bio-physical model. We find that the oxygen concentration in the OMZ displays a seasonal cycle with an amplitude of 5–15 % of the annual mean oxygen concentration. The OMZ is ventilated by lateral ventilation along the western boundary current and in the coastal undercurrent along India during the summer monsoon and by coastal downwelling and negative Ekman pumping during the fall intermonsoon and winter monsoon. This ventilation is counterbalanced by strong coastal upwelling and positive Ekman pumping of low oxygen waters at the base of the OMZ during the spring intermonsoon. Although the factors controlling the OMZ seasonality are associated with the men circulation, we find that mesoscale dynamics modulates them by limiting the vertical ventilation during winter and enhancing it through lateral advection during the rest of the year. Processes explaining the establishment and spatial distribution of the OMZ were quantified using a perturbation experiment initialised with no OMZ. As expected, the oxygen depletion is triggered by strong biological activity in central Arabian Sea during winter and in western and eastern boundary coastal upwelling systems during summer. We find that the 3-D ocean dynamic largely controls the spatial distribution of the OMZ. The eastward shift ensues from the northward lateral transport of ventilated waters along the western and eastern coasts and the advection offshore of low oxygen waters formed in the upwelling system.

scholarly journals Diel vertical migration of decapod larvae in the Portuguese coastal upwelling ecosystem: implications for offshore transport

2008 ◽  
Vol 359 ◽  
pp. 171-183 ◽  
Author(s):  
A dos Santos ◽  
AMP Santos ◽  
DVP Conway ◽  
C Bartilotti ◽  
P Lourenço ◽  
...  
Keyword(s):  
Vertical Migration ◽  
Diel Vertical Migration ◽  
Coastal Upwelling ◽  
Offshore Transport ◽  
Decapod Larvae

scholarly journals Mesozooplankton and Ichthyoplankton composition in two tropical estuaries of Bahia, Brazil

Check List ◽  
2010 ◽  
Vol 6 (2) ◽  
pp. 210 ◽  
Author(s):  
Catarina Da Rocha Marcolin ◽  
Bárbara Luciana da Conceição ◽  
Marcos Moura Nogueira ◽  
Paulo Mafalda Júnior ◽  
Rodrigo Johnsson
Keyword(s):  
Spatial Distribution ◽  
Fish Larvae ◽  
Descriptive Analysis ◽  
Mesh Size ◽  
Tropical Estuaries ◽  
Shrimp Farm ◽  
Decapod Larvae

The objective of this study was to describe the composition of two mesozooplankton and ichthyoplankton estuarine communities in Jandaíra, Bahia (Tabatinga River), impacted by a shrimp farm; and in Conde, Bahia (Itapicuru River), a pristine estuary. Samples were collected through horizontal hauls using a net (200 μm mesh size), coupled to a flowmeter, during the ebbing and flooding tides in April, August and December, 2007. In the Tabatinga and Itapicuru Rivers 76 and 92 taxa were registered. The most abundant groups were Pseudodiaptomus richardii and Disco sp. Acartia lilljeborgi was also dominant at Tabatinga, while Temora sp. and decapod larvae were predominant in Itapicuru River, which also presented higher densities for most planktonic taxa, particularly fish larvae. A descriptive analysis of the main taxa´s spatial distribution and new geographical records of Disco sp., P. richardi, Pontellopsis villosa, Macrosetella gracilis, Microsetella rosea, Gonyiopsillus brasiliensis, Agetus flaccus and Ergasilus caraguatatubensis were presented.

scholarly journals Spatial and temporal distribution of decapod larvae in the subtropical waters of the Arvoredo archipelago, SC, Brazil

2006 ◽  
Vol 96 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Andréa G. Koettker ◽  
Andrea S. Freire
Keyword(s):  
Spatial Distribution ◽  
Temporal Distribution ◽  
Shallow Waters ◽  
General Tendency ◽  
Temporal And Spatial Distribution ◽  
Temporal And Spatial ◽  
Abundance And Diversity ◽  
One Year ◽  
Planktonic Community ◽  
Decapod Larvae

The present paper aims to describe the temporal and spatial distribution of the composition and abundance of Decapoda larvae in the shallow waters around Arvoredo Marine Biological Reserve. Stomatopod occurrence is also discussed. Plankton samples were collected at five sites around the Arvoredo Island every two months for one year from May, 2002 to April, 2003. Thirty-nine morphotypes, 11 genus and 4 species (Artemesia longinaris Bate, 1888, Hexapanopeus schmitii Rathbun, 1930, Menippe nodifrons Stimpson, 1859 and Pleoticus muelleri Bate, 1888) were identified, among them only two morphotypes of Stomatopoda larvae, and the remainder Decapoda larvae. Brachyuran zoeae were the most abundant group and they were well represented by Portunidae and Xanthidae zoeae. Lucifer sp. and Caridea zoeae were the most abundant non-brachyuran taxa. Decapod larvae were observed to occur at all sampling sites, however the spatial distribution demonstrated a general tendency to greater abundance and diversity at the southern sites of the Island. Decapoda and Stomatopoda larvae occurred throughout the year, showing that reproduction is continuous, but that larval input in planktonic community was significantly higher during autumn and spring.

Research on Temporal and Spatial Distribution of PM10 in Yantai Urban Areas from 2006 to 2010

2012 ◽  
Vol 178-181 ◽  
pp. 737-740
Author(s):  
Ming Chang ◽  
Jian Guo Song ◽  
Xin Zhi Wang ◽  
Wei Liu
Keyword(s):  
Spatial Distribution ◽  
Urban Areas ◽  
Seasonal Changes ◽  
Interannual Variation ◽  
Average Concentration ◽  
Temporal And Spatial Distribution ◽  
Yantai City ◽  
Temporal And Spatial ◽  
Two Stages ◽  
Over Time

The purpose of this thesis is to study the characteristics of PM10 concentrations in the atmosphere over time granularity and spatial distribution in Yantai city. The concentration of PM10 is investigated in the daily from 2006 to 2010. The result shows that the characteristics of PM10 concentration in each time granularity are different: the interannual variation can be divided into two stages and the highest is approximately equal twice times of the lowest. The seasonal changes is distinct and the PM10 average concentration presents a feature that spring > winter > autumn > summer. And the highest month of PM10 is April, followed in March and May. The geographical distribution of PM10 is the center of pollution has been located in region A. Each region getting lowest in summer and the minimum one is region H where the concentration is 0.052mg/m3. The function regions can be divided into two categories: most regions show same as the seasonal changes but the region A and G’s characteristics change dramatically and the concentration of PM10 has come to 0.156 mg/m3 in the winter.

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