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- W292391621 abstract "The geochemistry of fish otoliths is a valuable tool for reconstructing environmental conditions, migrations and life histories. In this study we validate the relationship between temperature, the water oxygen isotope composition (δ 18 O) and otolith δ 18 O for the endangered Totoaba macdonaldi, raised under controlled aquaculture conditions and in the field. This type of validation is instrumental for habitat reconstruction. By comparing δ 18 O values in the natal portion of totoaba otoliths from modern and pre-dam specimens ~1000–4500 yr BP, we test the hypothesis that the totoaba used the Colorado River estuary as a nursery site before the river was over-allocated. We found that otolith δ 18 O could be predicted in a laboratory setting as well as in the wild. Totoaba otoliths from before river diversion had drastically lower natal δ 18 O values than predicted values, indicating that these differences in δ 18 O values are the result of a change in the water δ 18 O, a consequence of diverting the isotopically negative Colorado River flow from the totoaba’s nursery grounds. We conclude that the Colorado River flow was a major component of the totoaba’s nursery habitat before river diversions. These results are pertinent to ongoing research on this endangered fish, using otoliths to piece together important ecological and life history information." @default.
- W292391621 created "2016-06-24" @default.
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- W292391621 date "2008-01-01" @default.
- W292391621 modified "2023-09-27" @default.
- W292391621 title "Fish without water: Validation and application of δ 18 O in Totoaba macdonaldi otoliths Peces sin agua: Validación y aplicación de δ 18 O en los otolitos de Totoaba macdonaldi" @default.
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