savannacorridors
Analysis of palaeoecological records across South-East Asia to determine the evidence for regime shifts between open savannas and dense tropical forests occurred since the Last Glacial Maximum
Science Score: 67.0%
This score indicates how likely this project is to be science-related based on various indicators:
-
✓CITATION.cff file
Found CITATION.cff file -
✓codemeta.json file
Found codemeta.json file -
✓.zenodo.json file
Found .zenodo.json file -
✓DOI references
Found 3 DOI reference(s) in README -
✓Academic publication links
Links to: scholar.google, zenodo.org -
○Committers with academic emails
-
○Institutional organization owner
-
○JOSS paper metadata
-
○Scientific vocabulary similarity
Low similarity (6.0%) to scientific vocabulary
Keywords
Repository
Analysis of palaeoecological records across South-East Asia to determine the evidence for regime shifts between open savannas and dense tropical forests occurred since the Last Glacial Maximum
Basic Info
Statistics
- Stars: 1
- Watchers: 3
- Forks: 2
- Open Issues: 0
- Releases: 3
Topics
Metadata Files
README.md
Testing evidence for savanna corridors in South-East Asia since the Last Glacial Maximum
Analysis of palaeoecological records across South-East Asia to determine the evidence for regime shifts between open savannas and dense tropical forests occurred since the Last Glacial Maximum
Code contributors: Rebecca Hamilton, Corey J. A. Bradshaw, Frdrik Saltr, Jesse Wolfhagen
Accompanies paper:
Hamilton, R, N Amano, CJA Bradshaw, F Saltr, R Patalano, D Penny, J Stevenson, J Wolfhagen, P Roberts. 2023. Seasonal forests, not long-term savanna corridors, dominated in South-East Asia during the Last Glacial Maximum. Proceedings of the National Academy of Sciences of the USA doi:10.1073/pnas.2311280120
Abstract
The dominant paradigm is that large tracts of Southeast Asias lowland rainforests were replaced with a savanna corridor during the cooler, more seasonal climates of the Last Glacial Maximum (23000 to 19000 years ago). This interpretation has implications for understanding the resilience of Asias tropical forests to projected climate change, implying a vulnerability to savannization. A savanna corridor is also an important foundation for archaeological interpretations of how humans moved through and settled insular Southeast Asia and Australia. Yet an up-to-date, multi-proxy, and empirical examination of the palaeoecological evidence for this corridor is lacking. We did qualitative and statistical analyses of 59 palaeoecological records across Southeast Asia to test the evidence for Last Glacial Maximum (LGM) savannization and clarify the relationships between methods, biogeography, and ecological change in the region from the start of Late Glacial Period (119000 years ago) to the present. The pollen records typically show montane forest persistence during the Last Glacial Maximum, while 13C biomarker proxies indicate the expansion of C4-rich grasslands. We reconcile this discrepancy by hypothesizing the expansion of montane forest in the uplands, and replacement of rainforest with seasonally dry tropical forest mosaics in the lowlands. We also find that smooth forest transitions between 34000 and 2000 years ago point to the capacity of Southeast Asias ecosystems both to resist and recover from climate stressors, suggesting resilience to savannization. Finally, the timing of ecological change observed in our combined datasets indicates an early onset of the LGM in Southeast Asia from ~ 30000 years ago.
Scripts
Data
Site-specific palaeoecological proxy series (raw data)
- G6-4.csv, SH19014grass.csv, G56149P2.csv, NPK2.csv, hordorli.csv, 18300.csv, 18323.csv, 18302.csv, CB19.csv, MD063075.csv, NS-0725.csv, 17964.csv, DDA.csv, G4K12P1.csv, PB-A.csv, GEOB100693.csv, PSS.csv, GeoB100537.csv, G52056P.csv, LL2.csv, RD-3.csv, KUM3.csv, G4K4P3.csv, BYK2.csv, TOW9.csv, BJ80391GGC.csv, MAT102B.csv, SO189_144KL.csv, MC1.csv, mbelen.csv
Compiled, age-resampled, standardised compilation of time series (34 ka to 2 ka), with site coordinates (lon/lat)
- SCallSACor.csv
Spatially constrained bivariate correlations to reproduce site-by-site correlation heatmap
- cormatrixallmean.csv
Supplementary data
- database descriptors (Excel file)
R packages
Scripts require following R libraries
- spatstat, gstat, maps, sp, ape, permute, ggplot2, dplyr, boot, tmvnsim, wCorr, hrbrthemes
Owner
- Name: Corey Bradshaw
- Login: cjabradshaw
- Kind: user
- Location: Adelaide, South Australia
- Company: Flinders University
- Website: http://globalecologyflinders.com
- Twitter: conservbytes
- Repositories: 15
- Profile: https://github.com/cjabradshaw
Matthew Flinders Professor of Global Ecology @GlobalEcologyFlinders @CABAH
Citation (CITATION.cff)
cff-version: 1.2SCu
message: "If you use this code and these data, please cite as below."
authors:
- family-names: Bradshaw
given-names: Corey
orcid: https://orcid.org/0000-0002-5328-7741
title: cjabradshaw/SavannaCorridors: v1.2SCu
version: v1.2SCu
date-released: 2023-06-30
GitHub Events
Total
Last Year
Committers
Last synced: about 2 years ago
Top Committers
| Name | Commits | |
|---|---|---|
| Corey Bradshaw | c****w@g****m | 70 |
| Jesse Wolfhagen | j****n@g****m | 3 |
Issues and Pull Requests
Last synced: about 2 years ago
All Time
- Total issues: 0
- Total pull requests: 0
- Average time to close issues: N/A
- Average time to close pull requests: N/A
- Total issue authors: 0
- Total pull request authors: 0
- Average comments per issue: 0
- Average comments per pull request: 0
- Merged pull requests: 0
- Bot issues: 0
- Bot pull requests: 0
Past Year
- Issues: 0
- Pull requests: 0
- Average time to close issues: N/A
- Average time to close pull requests: N/A
- Issue authors: 0
- Pull request authors: 0
- Average comments per issue: 0
- Average comments per pull request: 0
- Merged pull requests: 0
- Bot issues: 0
- Bot pull requests: 0