scholarly journals Nematode Parasites in Baltic Sea Mammals, Grey Seal (Halichoerus grypus (Fabricius, 1791)) and Harbour Porpoise (Phocoena phocoena (L.)), from the German Coast

2020 ◽  
Author(s):  
Michael Gabel ◽  
Stefan Theisen ◽  
Harry Wilhelm Palm ◽  
Michael Dähne ◽  
Patrick Unger
Keyword(s):  
Baltic Sea ◽  
Parasite Species ◽  
Parasite Fauna ◽  
Eastern Coast ◽  
Halichoerus Grypus ◽  
Phocoena Phocoena ◽  
The Baltic Sea ◽  
Nematode Parasites ◽  
The Baltic ◽  
Anisakid Nematodes

Abstract Purpose Endoparasitic nematodes of six harbour porpoises Phocoena phocoena and four grey seals Halichoerus grypus, stranded at the eastern coast of the Baltic Sea in Germany in winter 2019, were analysed in order to identify nematode parasites and to compare with recent studies from the same area. Methods Endoparasitic nematodes were identified by using both morphological and molecular characters. The successfully obtained sequences of the rDNA marker regions ITS-1, 5.8S, ITS-2 from 29 anisakid and the rDNA marker region ITS-2 of 11 pseudalid nematodes were amplified. Results Analyses revealed the presence of three parasite species, the anisakid nematode Contracaecum osculatum from grey seals and the pseudalid nematodes Pseudalius inflexus and Stenurus minor from the harbour porpoises. Other anisakid nematodes regularly occurring in the Baltic Sea, e.g. Anisakis simplex or Pseudoterranova decipiens, were not found. Conclusions The prevalence of 100% and a severe parasite load in grey seals demonstrated a very high C. osculatum infection of Baltic Sea fish as their regular prey. Prevalence of 33% for parasites in harbour porpoises and minor infection rates, combined with a distinct lack of anisakid nematodes, are typical for the current situation of the porpoise parasite fauna in the Baltic Sea. Invasive parasite species as possible indicators for climate change could not be detected.

scholarly journals Emergence of the Zoonotic Biliary Trematode Pseudamphistomum truncatum in Grey Seals (Halichoerus grypus) in the Baltic Sea

PLoS ONE ◽  
2016 ◽  
Vol 11 (10) ◽  
pp. e0164782 ◽  
Author(s):  
Aleksija S. Neimanis ◽  
Charlotta Moraeus ◽  
Anders Bergman ◽  
Anders Bignert ◽  
Johan Höglund ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Halichoerus Grypus ◽  
The Baltic Sea ◽  
The Baltic

scholarly journals Life cycle bioenergetics of the gray seal (Halichoerus grypus) in the Baltic Sea: Population response to environmental stress

2020 ◽  
Vol 145 ◽  
pp. 106145 ◽  
Author(s):  
Willian T.A.F. Silva ◽  
Karin C. Harding ◽  
Gonçalo M. Marques ◽  
Britt Marie Bäcklin ◽  
Christian Sonne ◽  
...  
Keyword(s):  
Life Cycle ◽  
Environmental Stress ◽  
Baltic Sea ◽  
Halichoerus Grypus ◽  
The Baltic Sea ◽  
Population Response ◽  
Gray Seal ◽  
The Baltic

Parasitological survey of smelt, Osmerus eperlanus (Actinopterygii: Osmeridae), from five estuary sites along the southern coast of the Baltic Sea

2017 ◽  
Vol 46 (3) ◽  
Author(s):  
Małgorzata Pilecka-Rapacz ◽  
Wojciech Piasecki ◽  
Małgorzata Głoćko ◽  
Vytautas Kesminas ◽  
Józef Domagała ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Parasite Fauna ◽  
Southern Coast ◽  
The Baltic Sea ◽  
Parasitological Survey ◽  
Osmerus Eperlanus ◽  
The Baltic ◽  
Comprehensive Study

AbstractThis is the first comprehensive study covering the parasite fauna of smelt,

scholarly journals Natural and Anthropogenic Factors Shaping the Shoreline of Klaipėda, Lithuania

2021 ◽  
Vol 9 (12) ◽  
pp. 1456
Author(s):  
Vitalijus Kondrat ◽  
Ilona Šakurova ◽  
Eglė Baltranaitė ◽  
Loreta Kelpšaitė-Rimkienė
Keyword(s):  
Baltic Sea ◽  
Coastal Development ◽  
Eastern Coast ◽  
Anthropogenic Factors ◽  
The South ◽  
The Baltic Sea ◽  
Shoreline Position ◽  
Shoreline Changes ◽  
South Eastern ◽  
The Baltic

Port of Klaipėda is situated in a complex hydrological system, between the Curonian Lagoon and the Baltic Sea, at the Klaipėda strait in the South-Eastern part of the Baltic Sea. It has almost 300 m of jetties separating the Curonian Spit and the mainland coast, interrupting the main path of sediment transport through the South-Eastern coast of the Baltic Sea. Due to the Port of Klaipėda reconstruction in 2002 and the beach nourishment project, which was started in 2014, the shoreline position change tendency was observed. Shoreline position measurements of various periods can be used to derive quantitative estimates of coastal process directions and intensities. These data can be used to further our understanding of the scale and timing of shoreline changes in a geological and socio-economic context. This study analyzes long- and short-term shoreline position changes before and after the Port of Klaipėda reconstruction in 2002. Positions of historical shorelines from various sources were used, and the rates (EPR, NSM, and SCE) of shoreline changes have been assessed using the Digital Shoreline Analysis System (DSAS). An extension of ArcGIS K-means clustering was applied for shoreline classification into different coastal dynamic stretches. Coastal development has changed in the long-term (1984–2019) perspective: the eroded coast length increased from 1.5 to 4.2 km in the last decades. Coastal accumulation processes have been restored by the Port of Klaipėda executing the coastal zone nourishment project in 2014.

scholarly journals Estimation of grey seal (Halichoerus grypus) diet composition in the Baltic Sea

2007 ◽  
Vol 6 ◽  
pp. 177 ◽  
Author(s):  
Karl Lundström ◽  
Olle Hjerne ◽  
Karin Alexandersson ◽  
Olle Karlsson
Keyword(s):  
Baltic Sea ◽  
Diet Composition ◽  
Estimation Method ◽  
Clupea Harengus ◽  
Halichoerus Grypus ◽  
Coregonus Lavaretus ◽  
Correction Factors ◽  
The Baltic Sea ◽  
Hard Part ◽  
The Baltic

We examined the digestive tract contents from 145 grey seals (Halichoerus grypus) collected between 2001 and 2004 in the Baltic Sea. We compensated for biases introduced by erosion of otoliths, both by using additional hard-part structures other than otoliths, and species-specific size and numerical correction factors. In the absence of numerical correction factors based on feeding experiments for some species, we used correction factors based on a relationship between otolith recoveryrate and otolith width. A total of 24 prey taxa were identified but only a few species contributed substantially to the diet. The estimated diet composition was, independently of the prey number estimation method and diet composition estimation model used, dominated by herring (Clupea harengus), both by numbers and biomass. In addition to herring, common whitefish (Coregonus lavaretus) and sprat (Sprattus sprattus) were important prey, but cyprinids (Cyprinidae), eelpout (Zoarces viviparus), flounder (Platichtys flesus) and salmon (Salmo salar) also contributed significantly. Our results indicated dietary differences between grey seals of different age as well as between seals from the northern (Gulf of Bothnia) and the southern (Baltic Proper) Baltic Sea.

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