scholarly journals Peer Review #2 of "Seasonal changes in the abundance and biomass of copepods in the south-eastern Baltic Sea in 2010 and 2011 (v0.1)"

2018 ◽  
Keyword(s):  
Baltic Sea ◽  
Peer Review ◽  
Seasonal Changes ◽  
The South ◽  
South Eastern ◽  
Eastern Baltic

scholarly journals Seasonal changes in the abundance and biomass of copepods in the south-eastern Baltic Sea in 2010 and 2011

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5562
Author(s):  
Lidia Dzierzbicka-Glowacka ◽  
Anna Lemieszek ◽  
Marcin Kalarus ◽  
Evelina Griniene
Keyword(s):  
Baltic Sea ◽  
Seasonal Changes ◽  
Trophic Levels ◽  
Taxonomic Structure ◽  
The South ◽  
Gulf Of Gdańsk ◽  
South Eastern ◽  
Gdansk Deep ◽  
Gulf Of Gdansk ◽  
Eastern Baltic

Background Copepods are major secondary producers in the World Ocean. They represent an important link between phytoplankton, microzooplankton and higher trophic levels such as fish. They are an important source of food for many fish species but also a significant producer of detritus. In the terms of the role they play in the marine food web, it is important to know how environmental variability affects the population of copepods. Methods The study of the zooplankton community in the south-eastern Baltic Sea conducted during a 24-month survey (from January 2010 to November 2011) resulted in the identification of 24 invertebrate species (10 copepods, seven cladocerans, four rotifers, one ctenophore, one larvacean, and one amphipod). Data were collected at two stations located in the open sea waters of the Gulf of Gdansk: the Gdansk Deep (P1) (54°50′N, 19°19′E) and in the western, inner part of the Gulf of Gdansk (P2) (54°32′N, 18°48.2′E). The vertical hauls were carried out with the use of two kinds of plankton nets with a mesh size of 100 µm: a Copenhagen net (in 2010), and a WP-2 net (in 2011). Results The paper describes the seasonal changes in the abundance and biomass of copepods, taking into account the main Baltic calanoid copepod taxa (Acartia spp., Temora longicornis and Pseudocalanus sp.). They have usually represented the main component of zooplankton. The average number of copepods at the P1 Station during the study period of 2010 was 3,913 ind m−3(SD 2,572) and their number ranged from 1,184 ind m−3 (in winter) to 6,293 ind m−3(in spring). One year later, the average count of copepods was higher, at 11,723 ind m−3(SD 6,980), and it ranged from 2,351 ind m−3(in winter) to 18,307 ind m−3(in summer). Their average count at P2 Station in 2010 was 29,141 ind m−3, ranging from 3,330 ind m−3(in March) to 67,789 ind m−3(in May). The average count of copepods in 2011 was much lower at 17,883 ind m−3, and it ranged from 1,360 ind m−3 (in April) to 39,559 ind m−3 (in May). Discussion The environmental conditions of the pelagic habitat change in terms of both depth and distance from the shore. Although the qualitative (taxonomic) structure of zooplankton is almost identical to that of the coastal waters, the quantitative structure (abundance and biomass) changes quite significantly. The maximum values of zooplankton abundance and biomass were observed in the summer season, both in the Gdansk Deep and in the inner part of the Gulf of Gdansk. Copepods dominated in the composition of zooplankton for almost the entire time of the research duration. Quantitative composition of copepods at the P1 Station differed from the one at P2 Station due to the high abundance of Pseudocalanus sp. which prefers colder, more saline waters.

scholarly journals Seasonal changes in the abundance and biomass of copepod in the south-eastern Baltic Sea in 2010 and 2011

2018 ◽  
Author(s):  
Lidia Dzierzbicka-Glowacka ◽  
Anna Lemieszek ◽  
Evelina Griniene ◽  
Marcin Kalarus
Keyword(s):  
Baltic Sea ◽  
Seasonal Changes ◽  
Trophic Levels ◽  
Zooplankton Abundance ◽  
The South ◽  
Gulf Of Gdańsk ◽  
South Eastern ◽  
Gdansk Deep ◽  
Gulf Of Gdansk ◽  
Eastern Baltic

Background. Copepods are the major secondary producers in the World Ocean. They represent an important link between phytoplankton, microzooplankton and higher trophic levels such as fish. They are an important source of food for many fish species, but also a significant producer of detritus. In terms of their role in the marine food web, it is important to know how the environmental variability affects the population of Copepoda. Methods. The study of the zooplankton community in the south-eastern Baltic Sea conducted during a 24-month survey (January 2010 to November 2011) resulted in 24 invertebrate species identified (10copepods, 7cladocerans, 4rotifers, 1ctenophore, Fritillaria borealis and Hyperia galba). Data were collected at two stations located on the open-sea deep-water station – the Gdańsk Deep (54o50’φN, 19o19’λE) and in the western, inner part of the Gulf of Gdańsk (54o32’ φN, 18o48.2 ’λE). Vertical hauls were carried out using two nets: a Copenhagen net with an inlet diameter of 50 cm and a mesh diameter of 100 µm (in 2010) and WP-2 net from KC Denmark with an inlet diameter of 57 cm and a mesh diameter of 100 µm (in 2011). Results. The paper describes seasonal changes in the abundance and biomass of Copepoda, taking into account the main Baltic calanoid copepod taxa (Acartia spp., Temora longicornis and Pseudocalanus sp.). They usually represented the main component of zooplankton. The average number of Copepoda at station P1 during the study period of 2010 was 3913 ind.m-3 (SD 2572) and their number ranged from 1184 ind. m-3 (in winter) to 6293 ind.m-3 (in spring). One year later, the average count of copepods was higher, i.e. 11 723 ind. m-3 (SD 6980) and ranged from 2351 ind. m-3 (in winter) to 18 307 ind.m-3 (in summer). Their average count at station P2 in 2010 was 29 141 ind. m-3 ranging from 3330 ind.m-3 (in March) to 67 789 ind. m-3 (in May). The average count of copepods in 2011 was much lower – 17 883 ind./m3 and ranged from 1360 ind./m3 (in April) to 39 559 ind./m3 (in May). Discussion. The environment of pelagic animals changes with the distance from the shore and with the sea depth. Although the qualitative structure of zooplankton is almost identical with that of the coastal waters, the quantitative structure changes quite significantly. The maximum values of zooplankton abundance and biomass were observed in the summer season, both in the Gdańsk Deep and the inner part of the Gulf of Gdańsk. Copepoda dominated in the composition of zooplankton for almost the entire duration of the research.. Quantitative taxonomic composition of Copepoda at station P1 (the Gdańsk Deep) was different compared to station P2 (the western, inner part of the Gulf of Gdańsk) due to a high percentage of a crustacean preferring waters with lower temperature and higher salinity – Pseudocalanus sp.

scholarly journals Seasonal changes in the abundance and biomass of copepod in the south-eastern Baltic Sea in 2010 and 2011

2018 ◽  
Author(s):  
Lidia Dzierzbicka-Glowacka ◽  
Anna Lemieszek ◽  
Evelina Griniene ◽  
Marcin Kalarus
Keyword(s):  
Baltic Sea ◽  
Seasonal Changes ◽  
Trophic Levels ◽  
Zooplankton Abundance ◽  
The South ◽  
Gulf Of Gdańsk ◽  
South Eastern ◽  
Gdansk Deep ◽  
Gulf Of Gdansk ◽  
Eastern Baltic

Background. Copepods are the major secondary producers in the World Ocean. They represent an important link between phytoplankton, microzooplankton and higher trophic levels such as fish. They are an important source of food for many fish species, but also a significant producer of detritus. In terms of their role in the marine food web, it is important to know how the environmental variability affects the population of Copepoda. Methods. The study of the zooplankton community in the south-eastern Baltic Sea conducted during a 24-month survey (January 2010 to November 2011) resulted in 24 invertebrate species identified (10copepods, 7cladocerans, 4rotifers, 1ctenophore, Fritillaria borealis and Hyperia galba). Data were collected at two stations located on the open-sea deep-water station – the Gdańsk Deep (54o50’φN, 19o19’λE) and in the western, inner part of the Gulf of Gdańsk (54o32’ φN, 18o48.2 ’λE). Vertical hauls were carried out using two nets: a Copenhagen net with an inlet diameter of 50 cm and a mesh diameter of 100 µm (in 2010) and WP-2 net from KC Denmark with an inlet diameter of 57 cm and a mesh diameter of 100 µm (in 2011). Results. The paper describes seasonal changes in the abundance and biomass of Copepoda, taking into account the main Baltic calanoid copepod taxa (Acartia spp., Temora longicornis and Pseudocalanus sp.). They usually represented the main component of zooplankton. The average number of Copepoda at station P1 during the study period of 2010 was 3913 ind.m-3 (SD 2572) and their number ranged from 1184 ind. m-3 (in winter) to 6293 ind.m-3 (in spring). One year later, the average count of copepods was higher, i.e. 11 723 ind. m-3 (SD 6980) and ranged from 2351 ind. m-3 (in winter) to 18 307 ind.m-3 (in summer). Their average count at station P2 in 2010 was 29 141 ind. m-3 ranging from 3330 ind.m-3 (in March) to 67 789 ind. m-3 (in May). The average count of copepods in 2011 was much lower – 17 883 ind./m3 and ranged from 1360 ind./m3 (in April) to 39 559 ind./m3 (in May). Discussion. The environment of pelagic animals changes with the distance from the shore and with the sea depth. Although the qualitative structure of zooplankton is almost identical with that of the coastal waters, the quantitative structure changes quite significantly. The maximum values of zooplankton abundance and biomass were observed in the summer season, both in the Gdańsk Deep and the inner part of the Gulf of Gdańsk. Copepoda dominated in the composition of zooplankton for almost the entire duration of the research.. Quantitative taxonomic composition of Copepoda at station P1 (the Gdańsk Deep) was different compared to station P2 (the western, inner part of the Gulf of Gdańsk) due to a high percentage of a crustacean preferring waters with lower temperature and higher salinity – Pseudocalanus sp.

scholarly journals Remote Sensing of Coastal Upwelling in the South-Eastern Baltic Sea: Statistical Properties and Implications for the Coastal Environment

2018 ◽  
Vol 10 (11) ◽  
pp. 1752 ◽  
Author(s):  
Toma Dabuleviciene ◽  
Igor E. Kozlov ◽  
Diana Vaiciute ◽  
Inga Dailidiene
Keyword(s):  
Baltic Sea ◽  
Satellite Data ◽  
Coastal Upwelling ◽  
Optical Data ◽  
Curonian Lagoon ◽  
The South ◽  
Near Surface ◽  
South Eastern ◽  
The Baltic ◽  
Eastern Baltic

A detailed study of wind-induced coastal upwelling (CU) in the south-eastern Baltic Sea is presented based on an analysis of multi-mission satellite data. Analysis of moderate resolution imaging spectroradiometer (MODIS) sea surface temperature (SST) maps acquired between April and September of 2000–2015 allowed for the identification of 69 CU events. The Ekman-based upwelling index (UI) was applied to evaluate the effectiveness of the satellite measurements for upwelling detection. It was found that satellite data enable the identification of 87% of UI-based upwelling events during May–August, hence, serving as an effective tool for CU detection in the Baltic Sea under relatively cloud-free summer conditions. It was also shown that upwelling-induced SST drops, and its spatial properties are larger than previously registered. During extreme upwelling events, an SST drop might reach 14 °C, covering a total area of nearly 16,000 km2. The evolution of an upwelling front during such intensive events is accompanied by the generation of transverse filaments extending up to 70 km offshore. An analysis of the satellite optical data shows a clear decline in the chlorophyll-a concentration in the coastal zone and in the shallow Curonian Lagoon, where it drops down by an order of magnitude. It was also shown that a cold upwelling front alters the stratification in the atmospheric boundary layer, leading to a sudden drop of air temperature and near-surface winds.

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