FN Archimer Export Format
PT J
TI Validation of otolith δ18O values as effective natural tags for shelf-scale geolocation of migrating fish
BT 
AF DARNAUDE, Audrey M.
   HUNTER, Ewan
AS 1:1,2;2:2,3;
FF 1:;2:;
C1 Univ Montpellier, UMR MARBEC 9190, CNRS, Pl Eugene Bataillon, F-34095 Montpellier, France.
   Lowestoft Lab, Ctr Environm Fisheries & Aquaculture Sci, Lowestoft NR33 0HT, Suffolk, England.
   Univ East Anglia, Sch Environm Sci, Norwich Res Pk, Norwich NR4 7TJ, Norfolk, England.
C2 CNRS, FRANCE
   CEFAS, UK
   UNIV EAST ANGLIA, UK
UM MARBEC
IF 2.359
TC 22
UR https://archimer.ifremer.fr/doc/00626/73782/75084.pdf
LA English
DT Article
DE ;Fish migration;Oxygen;Stable isotopes;Natural tag;Site fidelity;Plaice;Pleuronectes platessa
AB The oxygen isotopic ratio of fish otoliths is increasingly used as a 'natural tag' to assess provenance in migratory species, with the assumption that variations in delta O-18 values closely reflect individual ambient experience of temperature and/or salinity. We employed archival tag data and otoliths collected from a shelf-scale study of the spatial dynamics of North Sea plaice Pleuronectes platessa L., to examine the limits of otolith delta O-18-based geolocation of fish during their annual migrations. Detailed intra-annual otolith delta O-18 measurements for 1997-1999 from individuals of 3 distinct sub-stocks with different spawning locations were compared with delta O-18 values predicted at the monthly, seasonal and annual scales, using predicted sub-stock specific temperatures and salinities over the same years. Spatio-temporal variation in expected delta O-18 values (-0.23 to 2.94%) mainly reflected variation in temperature, and among-zone discrimination potential using otolith delta O-18 varied greatly by temporal scale and by time of year. Measured otolith delta O-18 values (-0.71 to 3.09%) largely mirrored seasonally predicted values, but occasionally fell outside expected delta O-18 ranges. Where mismatches were observed, differences among sub-stocks were consistently greater than predicted, suggesting that in plaice, differential sub-stock growth rates and physiological effects during oxygen fractionation enhance geolocation potential using otolith delta O-18. Comparing intra-annual delta O-18 values over several consecutive years for individuals with contrasted migratory patterns corroborated a high degree of feeding and spawning site fidelity irrespective of the sub-stock. Informed interpretation of otolith delta O-18 values can therefore provide relatively detailed fisheries-relevant data not readily obtained by conventional means. 
PY 2018
PD JUL
SO Marine Ecology Progress Series
SN 0171-8630
PU Inter-research
VL 598
UT 000438415600014
BP 167
EP 185
DI 10.3354/meps12302
ID 73782
ER

EF