scholarly journals Predation of the introduced cladoceran Cercopagis pengoi on the native copepod Eurytemora affinis in the northern Baltic Sea

2008 ◽  
Vol 362 ◽  
pp. 193-200 ◽  
Author(s):  
M Lehtiniemi ◽  
E Gorokhova
Keyword(s):  
Baltic Sea ◽  
Eurytemora Affinis ◽  
Cercopagis Pengoi

Eurytemora affinis (Poppe, 1880) (Copepoda, Calanoida) in the Gulf of Riga, Baltic Sea — elemental composition and diurnal vertical migration

Crustaceana ◽  
2020 ◽  
Vol 93 (3-5) ◽  
pp. 447-466
Author(s):  
Astra Labuce ◽  
Solvita Strake ◽  
Inta Dimante-Deimantovica
Keyword(s):  
Surface Layer ◽  
Baltic Sea ◽  
Elemental Composition ◽  
Vertical Migration ◽  
Clupea Harengus ◽  
Elemental Content ◽  
Eurytemora Affinis ◽  
Diurnal Vertical Migration ◽  
Trade Offs ◽  
Gulf Of Riga

Abstract The present paper reports the results of two surveys conducted in the Gulf of Riga (Baltic Sea) during 1997. Elemental composition (carbon and nitrogen) and diurnal vertical migration (DVM) throughout development of the calanoid copepod Eurytemora affinis (Poppe, 1880) were studied. This is a species with a high genetic and morphological heterogeneity, inhabiting a seasonally stratified, herring (Clupea harengus Linnaeus, 1758) rich ecosystem. The DVM of copepods is a widespread advantageous behaviour, although with several trade-offs. At the expense of time spent in the food-richer surface layer, copepods avoid visual predators (planktivorous fish) by descending to greater depths, thereby decreasing their mortality. Being a part of the food web, copepods themselves serve as a source of nutrients with specific elemental contents. In the present study, we observed differences both in DVM and elemental content between the developmental stages of the studied species. The majority (57-89%) of nauplii and 1st to 3rd copepodids were found near the thermocline during daytime, whereas at night they were detected above the thermocline. The 5th stage copepodids and adults displayed evident nocturnal ascent, when most (>90%) individuals moved above 15 m depth. During daytime, they tended to disperse throughout the water column. Carbon (C%) and nitrogen (N%) in dry weight of E. affinis increased with ontogenetic development, reaching the highest values in 4th to 5th copepodids and adults. Adult males showed higher values of C% and N%, as well as an increased C : N molar ratio, compared to adult non-ovigerous females. The amount of time spent at the food-richer surface layer appeared to be related to N% in E. affinis.

scholarly journals Life in sympatry: coexistence of native Eurytemora affinis and invasive Eurytemora carolleeae in the Gulf of Finland (Baltic Sea)

Oceanologia ◽  
2019 ◽  
Vol 61 (2) ◽  
pp. 227-238 ◽  
Author(s):  
Natalia Sukhikh ◽  
Anissa Souissi ◽  
Sami Souissi ◽  
Anne-Catherine Holl ◽  
Nikolaos V. Schizas ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Gulf Of Finland ◽  
Eurytemora Affinis ◽  
The Gulf Of Finland
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