Fish without water: Validation and application of δ18O in Totoaba macdonaldi otoliths
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 (δ18O) and otolith δ18O for the endangered Totoaba macdonaldi, raised...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Universidad Autónoma de Baja California
2008-03-01
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| Series: | Ciencias Marinas |
| Subjects: | |
| Online Access: | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1256 |
| _version_ | 1797279470733754368 |
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| author | K Rowell C True KW Flessa DL Dettman |
| author_facet | K Rowell C True KW Flessa DL Dettman |
| author_sort | K Rowell |
| collection | DOAJ |
| description |
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 (δ18O) and otolith δ18O 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 δ18O 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 δ18O could be predicted in a laboratory setting as well as in the wild. Totoaba otoliths from before river diversion had drastically lower natal δ18O values than predicted values, indicating that these differences in δ18O values are the result of a change in the water δ18O, 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.
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| first_indexed | 2024-03-07T16:25:51Z |
| format | Article |
| id | doaj.art-89e1a1ca21b34c15bba55e3f3d6ed57a |
| institution | Directory Open Access Journal |
| issn | 0185-3880 2395-9053 |
| language | English |
| last_indexed | 2024-03-07T16:25:51Z |
| publishDate | 2008-03-01 |
| publisher | Universidad Autónoma de Baja California |
| record_format | Article |
| series | Ciencias Marinas |
| spelling | doaj.art-89e1a1ca21b34c15bba55e3f3d6ed57a2024-03-03T18:17:35ZengUniversidad Autónoma de Baja CaliforniaCiencias Marinas0185-38802395-90532008-03-0134110.7773/cm.v34i1.1256Fish without water: Validation and application of δ18O in Totoaba macdonaldi otolithsK Rowell0C True1KW Flessa2DL Dettman3University of ArizonaUniversidad Autónoma de Baja CaliforniaUniversity of ArizonaUniversity of Arizona 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 (δ18O) and otolith δ18O 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 δ18O 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 δ18O could be predicted in a laboratory setting as well as in the wild. Totoaba otoliths from before river diversion had drastically lower natal δ18O values than predicted values, indicating that these differences in δ18O values are the result of a change in the water δ18O, 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. https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1256otolithsoxygen isotopesColorado River estuarytotoabaestuary |
| spellingShingle | K Rowell C True KW Flessa DL Dettman Fish without water: Validation and application of δ18O in Totoaba macdonaldi otoliths Ciencias Marinas otoliths oxygen isotopes Colorado River estuary totoaba estuary |
| title | Fish without water: Validation and application of δ18O in Totoaba macdonaldi otoliths |
| title_full | Fish without water: Validation and application of δ18O in Totoaba macdonaldi otoliths |
| title_fullStr | Fish without water: Validation and application of δ18O in Totoaba macdonaldi otoliths |
| title_full_unstemmed | Fish without water: Validation and application of δ18O in Totoaba macdonaldi otoliths |
| title_short | Fish without water: Validation and application of δ18O in Totoaba macdonaldi otoliths |
| title_sort | fish without water validation and application of δ18o in totoaba macdonaldi otoliths |
| topic | otoliths oxygen isotopes Colorado River estuary totoaba estuary |
| url | https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/1256 |
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