Freshwater input, upwelling, and the evolution of Caribbean coastal ecosystems during formation of the Isthmus of Panama
Fuente:
PANGAEA
Guardado en:
| Autores principales: | , , , , , |
|---|---|
| Formato: | Dataset Open Access |
| Lenguaje: | en |
| Publicado: |
PANGAEA
2020
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1867168202526556160 |
|---|---|
| author | Grossman, Ethan L Robbins, John A Rachello-Dolmen, Paola Tao, Kai Saxena, Divya O'Dea, Aaron |
| author_facet | Grossman, Ethan L Robbins, John A Rachello-Dolmen, Paola Tao, Kai Saxena, Divya O'Dea, Aaron |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Caribbean biota underwent major ecological and evolutionary transformation in the Plio-Pleistocene but a lack of detailed paleoenvironmental reconstruction prevents thorough resolution of cause and effect. We quantify levels of upwelling and freshwater input into Caribbean coastal shelf ecosystems over the last ~6 Ma with >3300 stable isotope measurements from 74 fossil serially-sampled gastropods by normalizing δ18O values to open-ocean δ18O from planktonic foraminifera. We find that the influence of Pacific-like upwelling in the southwestern Caribbean (SWC) was low after 4.25 Ma but coastal ecosystems were heavily influenced by seasonal freshening until ~2.5 Ma, after which time low freshwater conditions were established. The origination of modern oligotrophic coastal conditions was therefore a result of oceanographic change causing declining upwelling, and declining nutrients from terrestrial sources. We speculate that a southward shift of the intertropical convergence zone, associated with Northern Hemisphere glaciation, reduced rainfall and terrestrial nutrient input and contributed to biotic turnover in the SWC, including the proliferation of modern reef communities. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_911974 |
| institution | PANGAEA |
| language | en |
| publishDate | 2020 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Freshwater input, upwelling, and the evolution of Caribbean coastal ecosystems during formation of the Isthmus of Panama Grossman, Ethan L Robbins, John A Rachello-Dolmen, Paola Tao, Kai Saxena, Divya O'Dea, Aaron Caribbean; extinction; File format; File name; File size; mollusks; Oxygen isotopes; Pliocene; productivity; sclerochronology; Uniform resource locator/link to file Caribbean biota underwent major ecological and evolutionary transformation in the Plio-Pleistocene but a lack of detailed paleoenvironmental reconstruction prevents thorough resolution of cause and effect. We quantify levels of upwelling and freshwater input into Caribbean coastal shelf ecosystems over the last ~6 Ma with >3300 stable isotope measurements from 74 fossil serially-sampled gastropods by normalizing δ18O values to open-ocean δ18O from planktonic foraminifera. We find that the influence of Pacific-like upwelling in the southwestern Caribbean (SWC) was low after 4.25 Ma but coastal ecosystems were heavily influenced by seasonal freshening until ~2.5 Ma, after which time low freshwater conditions were established. The origination of modern oligotrophic coastal conditions was therefore a result of oceanographic change causing declining upwelling, and declining nutrients from terrestrial sources. We speculate that a southward shift of the intertropical convergence zone, associated with Northern Hemisphere glaciation, reduced rainfall and terrestrial nutrient input and contributed to biotic turnover in the SWC, including the proliferation of modern reef communities. |
| title | Freshwater input, upwelling, and the evolution of Caribbean coastal ecosystems during formation of the Isthmus of Panama |
| topic | Caribbean; extinction; File format; File name; File size; mollusks; Oxygen isotopes; Pliocene; productivity; sclerochronology; Uniform resource locator/link to file |
| url | https://doi.org/10.1594/PANGAEA.911974 |