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首页> 外文学位 >Isotopic logs of the Sea of Cortez: Oxygen and carbon stable isotopes in otoliths of marine fish record the impact of diverting the Colorado River from the sea.
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Isotopic logs of the Sea of Cortez: Oxygen and carbon stable isotopes in otoliths of marine fish record the impact of diverting the Colorado River from the sea.

机译：科尔特斯海同位素记录：海水鱼耳石中的氧和碳稳定同位素记录了将科罗拉多河从海中转移的影响。

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I use microchemistry in fish otoliths to test the hypothesis that diverting Colorado River flow from reaching the Gulf of California has impacted two endemic fish: the threatened gulf Corvina, (Cynoscion othonopterus) and the endangered totoaba (Totoaba macdonaldi ). The oxygen and carbon stable isotope ratios in otoliths help to reconstruct conditions of the environment during key life history stages before and after the damming and diverting the Colorado River. The delta 18O in otoliths illustrate that both C. othonopterus and T. macdonaldi seek out brackish habitat provided by the Colorado River during their early life history. The delta18O of C. othonopterus otolith have a strong negative correlation with Colorado River flow. I found that previously published relationships between otolith delta18O and ambient temperature along with delta 18O of the water are sufficient to predict ranges of expected delta 18O values for T. macdonaldi in the field. The delta 18O in pre-dam T. macdonaldi otoliths show significant divergence from modern T. macdonaldi otoliths' values, indicating that these fish used the brackish waters of the Colorado River estuary. The delta 13 C in T. macdonaldi otoliths has a significant proportion of its delta13 C derived from diet. Pre-dam T. macdonaldi juveniles have a significantly different diet, which reflects that the Colorado River estuary had higher productivity before diversion of the river. Lastly, T. macdonaldi grew faster before the dams and in association with Colorado River flow measured by the delta 18O.
机译：我用鱼耳石中的微量化学来检验以下假设，即科罗拉多河从到达加利福尼亚湾的分流影响了两条地方性鱼类：濒临灭绝的海湾科维纳（Cynoscion othonopterus）和濒危的Totoaba（Totoaba macdonaldi）。耳石中氧和碳的稳定同位素比有助于在筑坝和分流科罗拉多河之前和之后的关键生命历史阶段重构环境条件。耳石中的三角洲18O说明，在生活早期，C。othonopterus和T. macdonaldi都在寻找科罗拉多河所提供的咸淡生境。耳形衣原耳耳石的delta18O与科罗拉多河流量呈强烈负相关。我发现，耳石δ18O与环境温度以及水的δ18O之间的先前已发布的关系足以预测野外T. macdonaldi的δ18O期望值范围。大坝前麦克唐纳氏耳石的三角洲18O值与现代麦克唐纳氏耳石的值有很大差异，表明这些鱼使用了科罗拉多河河口的咸水。 T. macdonaldi otoliths中的delta 13 C很大一部分来自饮食。大坝前麦克唐纳地幼鱼的饮食结构显着不同，这表明科罗拉多河河口改道前的生产力较高。最后，Macdonaldi T.在大坝之前以及与三角洲18O测得的科罗拉多河流量有关的增长速度更快。

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