<abstract xmlns="http://www.w3.org/1999/xhtml"><p>In the brackish ecosystem of the Gulf of Riga, the calanoid copepod <italic>Eurytemora affinis</italic> is a key species, but recently a new non-indigenous species <italic>Eurytemora carolleeae</italic> was discovered in the region. In the present study, we aimed to validate the presence of <italic>E. carolleeae</italic> in the southern part of the Gulf of Riga five years after its first discovery. The study area is the closest region to the Rīga harbour — the main source of non-indigenous species arrival in the Gulf. Recent studies have predicted the possible potential of <italic>E. carolleeae</italic> invasion due to its physiological plasticity. Male and female specimens of <italic>Eurytemora</italic> were collected in spring, summer, and autumn of 2013, and analysed based on three morphological indicators. Despite the higher reproduction rate of <italic>E. carolleeae</italic>, this intrusive species does not seem to have succeeded in establishing during the five-year period after its first discovery in the Gulf of Riga, and hence does not present a threat to the native <italic>E. affinis</italic> population in the study area.</p></abstract>

In the brackish ecosystem of the Gulf of Riga, the calanoid copepod Eurytemora affinis is a key species, but recently a new non-indigenous species Eurytemora carolleeae was discovered in the region. In the present study, we aimed to validate the presence of E. carolleeae in the southern part of the Gulf of Riga five years after its first discovery. The study area is the closest region to the Rīga harbour — the main source of non-indigenous species arrival in the Gulf. Recent studies have predicted the possible potential of E. carolleeae invasion due to its physiological plasticity. Male and female specimens of Eurytemora were collected in spring, summer, and autumn of 2013, and analysed based on three morphological indicators. Despite the higher reproduction rate of E. carolleeae, this intrusive species does not seem to have succeeded in establishing during the five-year period after its first discovery in the Gulf of Riga, and hence does not present a threat to the native E. affinis population in the study area.

Survey of Presence of Non-Indigenous <italic>Eurytemora Carolleeae</italic> in the Gulf of Riga (Baltic Sea) Five Years After its First Discovery

Univ. Lille 1 CNRS, Univ. Littoral Cote d’Opale

LOG, Laboratoire d’Océanologie et de Géosciences

Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Survey of Presence of Non-Indigenous  in the Gulf of Riga (Baltic Sea) Five Years After its First Discovery

In the brackish ecosystem of the Gulf of Riga, the calanoid copepod Eurytemora affinis is a key species, but recently a new non-indigenous species Eurytemora...

Survey of Presence of Non-Indigenous Eurytemora Carolleeae in the Gulf of Riga (Baltic Sea) Five Years After its First Discovery

Published Online: Aug 22, 2018

Page range: 230 - 235

Received: Mar 27, 2017

Accepted: Nov 18, 2017

DOI: https://doi.org/10.2478/prolas-2018-0032

Keywords
zooplankton, calanoid copepod, brackish, invasion

© 2018 Labuce Astra et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Survey of Presence of Non-Indigenous Eurytemora Carolleeae in the Gulf of Riga (Baltic Sea) Five Years After its First Discovery

Published Online: Aug 22, 2018

Page range: 230 - 235

Received: Mar 27, 2017

Accepted: Nov 18, 2017

DOI: https://doi.org/10.2478/prolas-2018-0032

Keywordszooplankton, calanoid copepod, brackish, invasion

© 2018 Labuce Astra et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
zooplankton, calanoid copepod, brackish, invasion