Mechanisms of rapid plant community change from the Miocene Succor Creek flora, Oregon and Idaho (USA).
The fossil record of the U.S. Pacific Northwest preserves many Middle Miocene floras with potential for revealing long-term climate-vegetation dynamics during the Miocene Climatic Optimum. However, the possibility of strong, eccentricity-paced climate oscillations and concurrent, intense volcanism m...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2024-01-01
|
| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0312104 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1846163582329290752 |
|---|---|
| author | Christopher M Schiller Alexander J Lowe Thomas A Dillhoff Patrick F Fields Abigail M Riley Ralph E Taggart Mark D Schmitz Caroline A E Strömberg |
| author_facet | Christopher M Schiller Alexander J Lowe Thomas A Dillhoff Patrick F Fields Abigail M Riley Ralph E Taggart Mark D Schmitz Caroline A E Strömberg |
| author_sort | Christopher M Schiller |
| collection | DOAJ |
| description | The fossil record of the U.S. Pacific Northwest preserves many Middle Miocene floras with potential for revealing long-term climate-vegetation dynamics during the Miocene Climatic Optimum. However, the possibility of strong, eccentricity-paced climate oscillations and concurrent, intense volcanism may obscure the signature of prevailing, long-term Miocene climate change. To test the hypothesis that volcanic disturbance drove Middle Miocene vegetation dynamics, high-resolution, stratigraphic pollen records and other paleobotanical data from nine localities of the Sucker Creek Formation were combined with sedimentological and geochemical evidence of disturbance within an updated chronostratigraphic framework based on new U-Pb zircon ages from tuffs. The new ages establish a refined, minimum temporal extent of the Sucker Creek Formation, ~15.8 to ~14.8 Ma, and greatly revise the local and regional chronostratigraphic correlations of its dispersed outcrop belt. Our paleoecological analysis at one ~15.52 Ma locality reveals two abrupt shifts in pollen spectra coinciding with the deposition of thick ash-flow tuffs, wherein vegetation dominated by Cupressaceae/Taxaceae, probably representing a Glyptostrobus oregonensis swamp, and upland conifers was supplanted by early-successional forests with abundant Alnus and Betula. Another ephemeral shift from Cupressaceae/Taxaceae swamp taxa in favor of upland conifers Pinus and Tsuga correlates with a shift from low-Ti shale to high-Ti claystone, suggesting a link between altered surface hydrology and vegetation. In total, three rapid vegetation shifts coincide with ash-flow tuffs and are attributed to volcanic disturbance. Longer-term variability between localities, spanning ~1 Myr of the Miocene Climatic Optimum, is chiefly attributed to eccentricity-paced climate change. Overall, Succor Creek plant associations changed frequently over ≤105 years timespans, reminiscent of Quaternary vegetation records. Succor Creek stratigraphic palynology suggests that numerous and extensive collection of stratigraphically controlled samples is necessary to understand broader vegetation trends through time. |
| format | Article |
| id | doaj-art-d8c890d6ebe04fbd9bb0c43ae4bd6857 |
| institution | Kabale University |
| issn | 1932-6203 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj-art-d8c890d6ebe04fbd9bb0c43ae4bd68572024-11-19T05:31:59ZengPublic Library of Science (PLoS)PLoS ONE1932-62032024-01-011911e031210410.1371/journal.pone.0312104Mechanisms of rapid plant community change from the Miocene Succor Creek flora, Oregon and Idaho (USA).Christopher M SchillerAlexander J LoweThomas A DillhoffPatrick F FieldsAbigail M RileyRalph E TaggartMark D SchmitzCaroline A E StrömbergThe fossil record of the U.S. Pacific Northwest preserves many Middle Miocene floras with potential for revealing long-term climate-vegetation dynamics during the Miocene Climatic Optimum. However, the possibility of strong, eccentricity-paced climate oscillations and concurrent, intense volcanism may obscure the signature of prevailing, long-term Miocene climate change. To test the hypothesis that volcanic disturbance drove Middle Miocene vegetation dynamics, high-resolution, stratigraphic pollen records and other paleobotanical data from nine localities of the Sucker Creek Formation were combined with sedimentological and geochemical evidence of disturbance within an updated chronostratigraphic framework based on new U-Pb zircon ages from tuffs. The new ages establish a refined, minimum temporal extent of the Sucker Creek Formation, ~15.8 to ~14.8 Ma, and greatly revise the local and regional chronostratigraphic correlations of its dispersed outcrop belt. Our paleoecological analysis at one ~15.52 Ma locality reveals two abrupt shifts in pollen spectra coinciding with the deposition of thick ash-flow tuffs, wherein vegetation dominated by Cupressaceae/Taxaceae, probably representing a Glyptostrobus oregonensis swamp, and upland conifers was supplanted by early-successional forests with abundant Alnus and Betula. Another ephemeral shift from Cupressaceae/Taxaceae swamp taxa in favor of upland conifers Pinus and Tsuga correlates with a shift from low-Ti shale to high-Ti claystone, suggesting a link between altered surface hydrology and vegetation. In total, three rapid vegetation shifts coincide with ash-flow tuffs and are attributed to volcanic disturbance. Longer-term variability between localities, spanning ~1 Myr of the Miocene Climatic Optimum, is chiefly attributed to eccentricity-paced climate change. Overall, Succor Creek plant associations changed frequently over ≤105 years timespans, reminiscent of Quaternary vegetation records. Succor Creek stratigraphic palynology suggests that numerous and extensive collection of stratigraphically controlled samples is necessary to understand broader vegetation trends through time.https://doi.org/10.1371/journal.pone.0312104 |
| spellingShingle | Christopher M Schiller Alexander J Lowe Thomas A Dillhoff Patrick F Fields Abigail M Riley Ralph E Taggart Mark D Schmitz Caroline A E Strömberg Mechanisms of rapid plant community change from the Miocene Succor Creek flora, Oregon and Idaho (USA). PLoS ONE |
| title | Mechanisms of rapid plant community change from the Miocene Succor Creek flora, Oregon and Idaho (USA). |
| title_full | Mechanisms of rapid plant community change from the Miocene Succor Creek flora, Oregon and Idaho (USA). |
| title_fullStr | Mechanisms of rapid plant community change from the Miocene Succor Creek flora, Oregon and Idaho (USA). |
| title_full_unstemmed | Mechanisms of rapid plant community change from the Miocene Succor Creek flora, Oregon and Idaho (USA). |
| title_short | Mechanisms of rapid plant community change from the Miocene Succor Creek flora, Oregon and Idaho (USA). |
| title_sort | mechanisms of rapid plant community change from the miocene succor creek flora oregon and idaho usa |
| url | https://doi.org/10.1371/journal.pone.0312104 |
| work_keys_str_mv | AT christophermschiller mechanismsofrapidplantcommunitychangefromthemiocenesuccorcreekfloraoregonandidahousa AT alexanderjlowe mechanismsofrapidplantcommunitychangefromthemiocenesuccorcreekfloraoregonandidahousa AT thomasadillhoff mechanismsofrapidplantcommunitychangefromthemiocenesuccorcreekfloraoregonandidahousa AT patrickffields mechanismsofrapidplantcommunitychangefromthemiocenesuccorcreekfloraoregonandidahousa AT abigailmriley mechanismsofrapidplantcommunitychangefromthemiocenesuccorcreekfloraoregonandidahousa AT ralphetaggart mechanismsofrapidplantcommunitychangefromthemiocenesuccorcreekfloraoregonandidahousa AT markdschmitz mechanismsofrapidplantcommunitychangefromthemiocenesuccorcreekfloraoregonandidahousa AT carolineaestromberg mechanismsofrapidplantcommunitychangefromthemiocenesuccorcreekfloraoregonandidahousa |