Vertical distribution and nocturnal migration of zooplankton in relation to the development of the seasonal thermocline in Patraikos Gulf

1990 ◽  
Vol 104 (3) ◽  
pp. 381-387 ◽  
Author(s):  
N. Fragopoulu ◽  
J. J. Lykakis
Keyword(s):  
Vertical Distribution ◽  
Seasonal Thermocline ◽  
Nocturnal Migration

Vertical distribution of plankton in the skagerrak in relation to doming of the seasonal thermocline

1982 ◽  
Vol 1 (2) ◽  
pp. 209-219 ◽  
Author(s):  
R.D. Pingree ◽  
P.M. Holligan ◽  
G.T. Mardell ◽  
R.P. Harris
Keyword(s):  
Vertical Distribution ◽  
Seasonal Thermocline

scholarly journals Influence of the Seasonal Thermocline on the Vertical Distribution of Larval Fish Assemblages Associated with Atlantic Bluefin Tuna Spawning Grounds

Oceans ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 64-83
Author(s):  
Itziar Alvarez ◽  
Leif K. Rasmuson ◽  
Trika Gerard ◽  
Raul Laiz-Carrion ◽  
Manuel Hidalgo ◽  
...  
Keyword(s):  
Vertical Distribution ◽  
Fish Assemblages ◽  
Larval Fish ◽  
Fish Larvae ◽  
Bluefin Tuna ◽  
Vertical Position ◽  
Near Surface ◽  
Atlantic Bluefin Tuna ◽  
Seasonal Thermocline ◽  
The Vertical Distribution

Temperature is often an important variable influencing the vertical position of fish larvae in the water column. The same species may show different vertical distributions in areas with a strong near-surface seasonal thermocline compared to isothermal near-surface regions. In areas with a strong surface thermocline, tuna larvae show a significant preference for the near-surface warmer layers. Little is known regarding larval tuna vertical distribution in isothermal waters and on the vertical distribution of the associated larval fish assemblages. We conducted vertical stratified sampling using the same methodology and fishing device (MOCNESS) in the two major spawning areas of Atlantic bluefin tuna (BFT): western Mediterranean Sea (MED), characterized by a surface thermocline, and the Gulf of Mexico (GOM) which lacks thermal stratification. Tuna larvae occupied the upper 30 m in both areas, but the average larval depth distribution was consistently deeper in the GOM. In the MED, vertical distribution of larval fish assemblages was explained by temperature, and species such as BFT, Thunnus alalunga, and Ceratoscopelus maderensis, among others, coexist above the thermocline and are separated from species such as Cyclothone braueri and Hygophum spp. (found below the thermocline). In the GOM, the environmental correlates of the vertical distribution of the larvae were salinity and fluorescence. Mesopelagic taxa such as Ceratoscopelus spp. and Cyclothone spp., among others, had a shallower average distribution than Lampanyctus spp., Hygophum spp., and Myctophum spp.

The influence of submesoscale eddies on hydrochemical parameters and structural and functional characteristics of phytoplankton in the north-eastern part of the Black Sea

2019 ◽  
pp. 24-40
Author(s):  
Sergey B. Kuklev ◽  
Vladimir A. Silkin ◽  
Valeriy K. Chasovnikov ◽  
Andrey G. Zatsepin ◽  
Larisa A. Pautova ◽  
...  
Keyword(s):  
Anticyclonic Eddy ◽  
The Black Sea ◽  
Hydrochemical Parameters ◽  
North East ◽  
The North ◽  
Seasonal Thermocline ◽  
North Eastern ◽  
Quantitative Indicators ◽  
The City ◽  
North Eastern Part

On June 7, 2018, a sub-mesoscale anticyclonic eddy induced by the wind (north-east) was registered on the shelf in the area of the city of Gelendzhik. With the help of field multidisciplinary expedition ship surveys, it was shown that this eddy exists in the layer above the seasonal thermocline. At the periphery of the eddy weak variability of hydrochemical parameters and quantitative indicators of phytoplankton were recorded. The result of the formation of such eddy structure was a shift in the structure of phytoplankton – the annual observed coccolithophores bloom was not registered.

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