Paleobotanical Insights into Fossil Arecaceae

Palaeobotanical research into the fossil record of palms (Arecaceae) has illuminated the evolutionary history, biogeography and palaeoclimatic significance of this distinctive angiosperm family. Fossilised leaves, wood, fruits and pollen grains document the early divergence of subfamilies such as Coryphoideae and Calamoideae by the Late Cretaceous, revealing a once widespread distribution across Gondwanan and Laurasian landmasses. Morphological analyses of costapalmate and pinnate leaf impressions demonstrate the establishment of major palm lineages before the K–Pg boundary, while wood anatomy and biocompound residues preserve evidence of physiological traits shared with extant genera. Palynological records extend the known range of endemic African taxa and underscore the role of pollen morphology in tracing lineage diversification. Integrating these data with sedimentology and isotope studies has refined estimates of tropical minimum temperatures and precipitation regimes through deep time. Moreover, evolutionary models link the absence of large megaherbivores in the early Palaeocene to shifts in defensive armature and fruit size, emphasising ecological interactions as drivers of trait evolution. Collectively, these insights highlight the global significance of fossil palms as proxies for past climates, shed light on continental dispersal pathways, and inform conservation of phylogenetic diversity in modern tropical and subtropical forests.

Research from Nature Portfolio

Recent work has assembled an extensive, manually filtered database of georeferenced Arecaceae occurrences to derive quantitative thresholds for minimum cold-month mean temperature (CMMT) across palm tribes. Statistical analyses reveal that while most palm lineages require mean cold-month temperatures above 5.2 °C, certain clades such as Trachycarpeae exhibit tolerance to CMMT as low as 2.2 °C. This refined thermal envelope challenges earlier assumptions about poleward expansion during Palaeogene hyperthermals and has been applied to resolve model-proxy mismatches at high latitudes. By partitioning sensitivity at subfamily and tribal levels, this research enhances the precision of palaeoclimate reconstructions based on fossil palm occurrences and underscores the importance of taxonomic resolution in ecological interpretations.

Paleobotanical Insights into Fossil Arecaceae publication trend

The graph below shows the total number of articles in paleobotanical insights into fossil arecaceae across all publications each year (not limited to Nature Index journals).

Technical terms

Costapalmate leaf: A fan-shaped leaf morphology in which segments radiate from a prominent central rib or costa.

Cold Month Mean Temperature (CMMT): The average temperature of the coldest month, used as a key parameter in palaeoclimate reconstructions.

Palynology: The study of fossil pollen and spores to reconstruct past plant communities and climates.

Palaeocene megaherbivore gap: A roughly 25-million-year interval after the Cretaceous–Palaeogene extinction during which large herbivorous mammals were absent, affecting plant evolutionary trajectories.

References

1. The relation between global palm distribution and climate. Scientific Reports (2018).
2. Coryphoid Palm Leaf Fossils from the Maastrichtian–Danian of Central India with Remarks on Phytogeography of the Coryphoideae (Arecaceae). PLOS ONE (2014).
3. The megaherbivore gap after the non-avian dinosaur extinctions modified trait evolution and diversification of tropical palms. Proceedings of the Royal Society B (2022).
4. Earliest fossil pollen records of endemic African Sclerosperma palms and the palaeoecological aspects of the genus. Review of Palaeobotany and Palynology (2023).
5. A report on biocompounds from palm fossil of India. Bioinformation (2014).