Post‐Glacial Vegetation Trajectories on the Eastern Tibetan Plateau Reflect Millennial‐Scale Migration Lags in Complex Mountain Terrain Based on Sedimentary Ancient DNA and Dynamic Dispersal Modeling
ABSTRACT Mountains with complex terrain and steep environmental gradients are biodiversity hotspots such as the eastern Tibetan Plateau (TP). However, it is generally assumed that mountain terrain plays a secondary role in plant species assembly on a millennial time‐scale compared to climate change....
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Wiley
2025-01-01
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| Series: | Ecology and Evolution |
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| Online Access: | https://doi.org/10.1002/ece3.70862 |
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| author | Wei Shen Stefan Kruse Sisi Liu Kathleen Stoof‐Leichsenring Ingolf Kühn Wenjia Li Xianyong Cao Zhi‐Rong Zhang Chun‐Xia Zeng Jun‐Bo Yang De‐Zhu Li Ulrike Herzschuh |
| author_facet | Wei Shen Stefan Kruse Sisi Liu Kathleen Stoof‐Leichsenring Ingolf Kühn Wenjia Li Xianyong Cao Zhi‐Rong Zhang Chun‐Xia Zeng Jun‐Bo Yang De‐Zhu Li Ulrike Herzschuh |
| author_sort | Wei Shen |
| collection | DOAJ |
| description | ABSTRACT Mountains with complex terrain and steep environmental gradients are biodiversity hotspots such as the eastern Tibetan Plateau (TP). However, it is generally assumed that mountain terrain plays a secondary role in plant species assembly on a millennial time‐scale compared to climate change. Here, we investigate plant richness and community changes during the last 18,000 years at two sites: Lake Naleng and Lake Ximen on the eastern TP with similar elevation and climatic conditions but contrasting terrain. We applied plant DNA metabarcoding to lake sediments leveraging a new regional reference database for taxa identification. Furthermore, we developed a simplified species dispersal model named SMARC. This was used to simulate species migration along river valleys in response to past climate change at the taxonomic resolution of the sedimentary ancient DNA (sedaDNA) approach. Statistical analyses, including ordination‐based ecological trajectory analysis, yielded a significant match between sedaDNA and simulated results at single taxon and community levels including certain site‐specific differences. Steep terrain downstream of Lake Naleng enhances connectivity to glacial lowland refugia during postglacial warming. In contrast, gentle terrain over long distances implies weak connectivity to the lowland and thus resulted in a strong migration lag at Lake Ximen. Likewise, terrain differences among our sites defined the different connectivity to alpine refugia during late‐Holocene cooling. Our consistent proxy‐ and model‐based results, for the first time, indicate that dispersal related migration lags in complex mountain terrain lead to uneven vegetation trajectories at sites with similar climatic conditions mainly because of differences in connectivity to refugia. Ultimately our results indicate that connectivity to refugia is a first‐order factor for species migration in addition to elevation‐related climatic conditions shaping the postglacial vegetation trajectory in mountainous terrain. This has hitherto largely been ignored when forecasting mountain vegetation responses to climate change and related risk assessment. |
| format | Article |
| id | doaj-art-4df4c6daffa643e0a86ae51535538b95 |
| institution | Kabale University |
| issn | 2045-7758 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Ecology and Evolution |
| spelling | doaj-art-4df4c6daffa643e0a86ae51535538b952025-01-29T05:08:42ZengWileyEcology and Evolution2045-77582025-01-01151n/an/a10.1002/ece3.70862Post‐Glacial Vegetation Trajectories on the Eastern Tibetan Plateau Reflect Millennial‐Scale Migration Lags in Complex Mountain Terrain Based on Sedimentary Ancient DNA and Dynamic Dispersal ModelingWei Shen0Stefan Kruse1Sisi Liu2Kathleen Stoof‐Leichsenring3Ingolf Kühn4Wenjia Li5Xianyong Cao6Zhi‐Rong Zhang7Chun‐Xia Zeng8Jun‐Bo Yang9De‐Zhu Li10Ulrike Herzschuh11Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems Potsdam GermanyAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems Potsdam GermanyAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems Potsdam GermanyAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems Potsdam GermanyDepartment of Community Ecology Helmholtz Centre for Environmental Research – UFZ Halle GermanyGroup of Alpine Paleoecology and Human Adaptation (ALPHA), state Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER) Institute of Tibetan Plateau Research, Chinese Academy of Sciences Beijing ChinaGroup of Alpine Paleoecology and Human Adaptation (ALPHA), state Key Laboratory of Tibetan Plateau Earth System, Environment and Resources (TPESER) Institute of Tibetan Plateau Research, Chinese Academy of Sciences Beijing ChinaGermplasm Bank of Wild Species Kunming Institute of Botany, Chinese Academy of Sciences Kunming ChinaGermplasm Bank of Wild Species Kunming Institute of Botany, Chinese Academy of Sciences Kunming ChinaGermplasm Bank of Wild Species Kunming Institute of Botany, Chinese Academy of Sciences Kunming ChinaGermplasm Bank of Wild Species Kunming Institute of Botany, Chinese Academy of Sciences Kunming ChinaAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems Potsdam GermanyABSTRACT Mountains with complex terrain and steep environmental gradients are biodiversity hotspots such as the eastern Tibetan Plateau (TP). However, it is generally assumed that mountain terrain plays a secondary role in plant species assembly on a millennial time‐scale compared to climate change. Here, we investigate plant richness and community changes during the last 18,000 years at two sites: Lake Naleng and Lake Ximen on the eastern TP with similar elevation and climatic conditions but contrasting terrain. We applied plant DNA metabarcoding to lake sediments leveraging a new regional reference database for taxa identification. Furthermore, we developed a simplified species dispersal model named SMARC. This was used to simulate species migration along river valleys in response to past climate change at the taxonomic resolution of the sedimentary ancient DNA (sedaDNA) approach. Statistical analyses, including ordination‐based ecological trajectory analysis, yielded a significant match between sedaDNA and simulated results at single taxon and community levels including certain site‐specific differences. Steep terrain downstream of Lake Naleng enhances connectivity to glacial lowland refugia during postglacial warming. In contrast, gentle terrain over long distances implies weak connectivity to the lowland and thus resulted in a strong migration lag at Lake Ximen. Likewise, terrain differences among our sites defined the different connectivity to alpine refugia during late‐Holocene cooling. Our consistent proxy‐ and model‐based results, for the first time, indicate that dispersal related migration lags in complex mountain terrain lead to uneven vegetation trajectories at sites with similar climatic conditions mainly because of differences in connectivity to refugia. Ultimately our results indicate that connectivity to refugia is a first‐order factor for species migration in addition to elevation‐related climatic conditions shaping the postglacial vegetation trajectory in mountainous terrain. This has hitherto largely been ignored when forecasting mountain vegetation responses to climate change and related risk assessment.https://doi.org/10.1002/ece3.70862ancient eDNAconnectivitydynamic dispersal modelmigration lagrefugiatrajectory analysis |
| spellingShingle | Wei Shen Stefan Kruse Sisi Liu Kathleen Stoof‐Leichsenring Ingolf Kühn Wenjia Li Xianyong Cao Zhi‐Rong Zhang Chun‐Xia Zeng Jun‐Bo Yang De‐Zhu Li Ulrike Herzschuh Post‐Glacial Vegetation Trajectories on the Eastern Tibetan Plateau Reflect Millennial‐Scale Migration Lags in Complex Mountain Terrain Based on Sedimentary Ancient DNA and Dynamic Dispersal Modeling Ecology and Evolution ancient eDNA connectivity dynamic dispersal model migration lag refugia trajectory analysis |
| title | Post‐Glacial Vegetation Trajectories on the Eastern Tibetan Plateau Reflect Millennial‐Scale Migration Lags in Complex Mountain Terrain Based on Sedimentary Ancient DNA and Dynamic Dispersal Modeling |
| title_full | Post‐Glacial Vegetation Trajectories on the Eastern Tibetan Plateau Reflect Millennial‐Scale Migration Lags in Complex Mountain Terrain Based on Sedimentary Ancient DNA and Dynamic Dispersal Modeling |
| title_fullStr | Post‐Glacial Vegetation Trajectories on the Eastern Tibetan Plateau Reflect Millennial‐Scale Migration Lags in Complex Mountain Terrain Based on Sedimentary Ancient DNA and Dynamic Dispersal Modeling |
| title_full_unstemmed | Post‐Glacial Vegetation Trajectories on the Eastern Tibetan Plateau Reflect Millennial‐Scale Migration Lags in Complex Mountain Terrain Based on Sedimentary Ancient DNA and Dynamic Dispersal Modeling |
| title_short | Post‐Glacial Vegetation Trajectories on the Eastern Tibetan Plateau Reflect Millennial‐Scale Migration Lags in Complex Mountain Terrain Based on Sedimentary Ancient DNA and Dynamic Dispersal Modeling |
| title_sort | post glacial vegetation trajectories on the eastern tibetan plateau reflect millennial scale migration lags in complex mountain terrain based on sedimentary ancient dna and dynamic dispersal modeling |
| topic | ancient eDNA connectivity dynamic dispersal model migration lag refugia trajectory analysis |
| url | https://doi.org/10.1002/ece3.70862 |
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