Remeslo A.V.,Atlantic Research Institute of Fisheries and Oceanography |
Yakushev M.R.,Atlantic Research Institute of Fisheries and Oceanography |
Journal of Natural History | Year: 2015
Data collected onboard two South Korean longliners in 2011–2014 targeting Antarctic toothfish provided insights into trophic interactions between two Antarctic top predators: the colossal squid Mesonychoteuthis hamiltoni and the Antarctic toothfish Dissostichus mawsoni. Adults of each species opportunistically prey upon weakened representatives of the other species: squid will feed on longline-caught toothfish, and toothfish on dying and dead squid. The highest occurrence of squid attacks was recorded in the Davis Sea and Commonwealth Sea, and the lowest in the Ross Sea. Squid depredation rates were around 1% on average, though regionally they might rise to 2–3%, which is of a similar magnitude to rates caused by sperm whales and killer whales in some areas. © 2015 Taylor & Francis.
Lidvanov V.V.,Atlantic Research Institute of Fisheries and Oceanography |
Zhigalova N.N.,Atlantic Research Institute of Fisheries and Oceanography |
Kuderskiy S.K.,Atlantic Research Institute of Fisheries and Oceanography
Oceanology | Year: 2010
The analysis of the vertical distribution of the zooplankton and of the peculiarities of the specific, biotopic, trophic, and spatial structures in relation to the hydrological features was performed on the basis of the data on the vertical zooplankton sampling fulfilled at a transect along the coast of Morocco and Mauritania over depths of 1000 m in the summer of 2004. The surveyed area is inhabited by five zooplankton complexes: three surface and two interzonal ones associated with the water masses of different origin. The vertical boundary between the southern and northern complexes corresponds to the southern boundary of the Senegal-Mauritanian frontal zone, while the horizontal boundary between the surface and the interzonal complexes is mainly at the depths of about 200 m, and its location is basically determined by the water's vertical dynamics. The surface and interzonal complexes of northern origin are involved in the formation of a highly productive zone in the waters of Cape Blanc. The formation of this zone is not related to upwelling. © 2010 Pleiades Publishing, Ltd.
Dmitrieva O.A.,Atlantic Research Institute of Fisheries and Oceanography |
Semenova A.S.,Atlantic Research Institute of Fisheries and Oceanography
Oceanology | Year: 2012
The trophic relationships of the phytoplankton and zooplankton in the Vistula Lagoon in 2008-2010 were investigated. In the current period, the lagoon is an eutrophic water body with summer blooms of blue-green algae. The trophic level of the Vistula Lagoon influences both the composition and quantitative characteristics of the communities of phytoplankton and zooplankton and the trophic relationships between them. In the analyzed period, the consumption of phytoplankton by the zooplankton on the average in the growing season was 28%, which is 1. 5 times higher than in the late 1970s. The high grazing pressure of the zooplankton on the phytoplankton reduces its biomass, production, and the intensity of the blooming by the blue-green algae in the Vistula Lagoon. © 2012 Pleiades Publishing, Ltd.
Karasiova E.M.,Atlantic Research Institute of Fisheries and Oceanography
Journal of Ichthyology | Year: 2016
Annual egg production in eastern Baltic cod Gadus morhua callarias in 1966–2000 has been assessed. A significant relationship between egg production and recruitment, progeny survival index, and 11psu-isohaline depth has been revealed. Comparison of egg production and spawning stock biomass indices has shown the time difference in their maxima and the absence of significant correlation between them. This difference is assumed to be due to an increase in the share of mature individuals that did not participate in spawning in the late 1970s–early 1980s. The determination of potential egg production, taking into account the share of individuals that spawn during the current year, yielded a significant positive relationship between its value and spawning stock biomass. © 2016, Pleiades Publishing, Ltd.
Kudryavtseva E.A.,RAS Shirshov Institute of Oceanology |
Pimenov N.V.,Russian Academy of Sciences |
Aleksandrov S.V.,Atlantic Research Institute of Fisheries and Oceanography |
Kudryavtsev V.M.,Russian Academy of Sciences
Oceanology | Year: 2011
The values and seasonal variations of the primary production and chlorophyll a content were investigated in the Russian sector of the Southeastern Baltic in 2003-2007. The annual average values of the primary production and chlorophyll content for this area were 231 gC m-2 year-1 and 2. 9 mg/m3, respectively; i. e., they corresponded to the mesotrophic level according to the trophic classification. The spatial distribution of the primary production and the chlorophyll concentrations in the different seasons and the annual average increased values exhibited at the northern coast of the Sambian Peninsula and the Curonian Spit were determined. In these areas, the values of the primary production and the chlorophyll concentrations corresponded to the eutrophic level. © 2011 Pleiades Publishing, Ltd.