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Oxygen and carbon isoscapes for the Baltic Sea: Testing their applicability in fish migration studies

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ABSTRACT

Conventional tags applied to individuals have been used to investigate animal movement, but these methods require tagged individuals be recaptured. Maps of regional isotopic variability known as “isoscapes” offer potential for various applications in migration research without tagging wherein isotope values of tissues are compared to environmental isotope values. In this study, we present the spatial variability in oxygen (δ18OH2O) and dissolved inorganic carbon (δ13CDIC) isotope values of Baltic Sea water. We also provide an example of how these isoscapes can reveal locations of individual animal via spatial probability surface maps, using the high‐resolution salmon otolith isotope data from salmon during their sea‐feeding phase in the Baltic Sea. A clear latitudinal and vertical gradient was found for both δ18OH2O and δ13CDIC values. The difference between summer and winter in the Baltic Sea δ18OH2O values was only slight, whereas δ13CDIC values exhibited substantial seasonal variability related to algal productivity. Salmon otolith δ18Ooto and δ13Coto values showed clear differences between feeding areas and seasons. Our example demonstrates that dual isotope approach offers great potential for estimating probable fish habitats once issues in model parameterization have been resolved.

No MeSH data available.


Relationships between sea water salinity and δ18OH2O measured in (a) Gulf of Bothnia, (b) Gulf of Finland and (c) Baltic Proper. Presented models were applied when estimating δ18OH2O for each area
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ece32841-fig-0005: Relationships between sea water salinity and δ18OH2O measured in (a) Gulf of Bothnia, (b) Gulf of Finland and (c) Baltic Proper. Presented models were applied when estimating δ18OH2O for each area

Mentions: There was a strong δ18OH2O–S relationship and the coefficients of determination for all the models were close to 1. Relationship appeared to be linear only for Southern Baltic Sea (R2 = .98), while in Gulf of Finland (R2 = .97) and Gulf of Bothnia relationships where of logarithmic shape (R2 = .99; Figure 5).


Oxygen and carbon isoscapes for the Baltic Sea: Testing their applicability in fish migration studies
Relationships between sea water salinity and δ18OH2O measured in (a) Gulf of Bothnia, (b) Gulf of Finland and (c) Baltic Proper. Presented models were applied when estimating δ18OH2O for each area
© Copyright Policy - creativeCommonsBy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC5383481&req=5

ece32841-fig-0005: Relationships between sea water salinity and δ18OH2O measured in (a) Gulf of Bothnia, (b) Gulf of Finland and (c) Baltic Proper. Presented models were applied when estimating δ18OH2O for each area
Mentions: There was a strong δ18OH2O–S relationship and the coefficients of determination for all the models were close to 1. Relationship appeared to be linear only for Southern Baltic Sea (R2 = .98), while in Gulf of Finland (R2 = .97) and Gulf of Bothnia relationships where of logarithmic shape (R2 = .99; Figure 5).

View Article: PubMed Central - PubMed

ABSTRACT

Conventional tags applied to individuals have been used to investigate animal movement, but these methods require tagged individuals be recaptured. Maps of regional isotopic variability known as “isoscapes” offer potential for various applications in migration research without tagging wherein isotope values of tissues are compared to environmental isotope values. In this study, we present the spatial variability in oxygen (δ18OH2O) and dissolved inorganic carbon (δ13CDIC) isotope values of Baltic Sea water. We also provide an example of how these isoscapes can reveal locations of individual animal via spatial probability surface maps, using the high‐resolution salmon otolith isotope data from salmon during their sea‐feeding phase in the Baltic Sea. A clear latitudinal and vertical gradient was found for both δ18OH2O and δ13CDIC values. The difference between summer and winter in the Baltic Sea δ18OH2O values was only slight, whereas δ13CDIC values exhibited substantial seasonal variability related to algal productivity. Salmon otolith δ18Ooto and δ13Coto values showed clear differences between feeding areas and seasons. Our example demonstrates that dual isotope approach offers great potential for estimating probable fish habitats once issues in model parameterization have been resolved.

No MeSH data available.