Please use this identifier to cite or link to this item: https://doi.org/10.1111/geb.13436
Title: The Cenozoic history of palms: Global diversification, biogeography and the decline of megathermal forests
Authors: Lim, Jun Ying 
Huang, Huasheng
Farnsworth, Alexander
Lunt, Daniel J
Baker, William J
Morley, Robert J
Kissling, W Daniel
Hoorn, Carina
Keywords: Arecaceae
climatic niche modelling
Eocene-Oligocene transition
fossil record
global cooling
palaeoclimate
palynology
tropical forests
Issue Date: 16-Dec-2021
Publisher: WILEY
Citation: Lim, Jun Ying, Huang, Huasheng, Farnsworth, Alexander, Lunt, Daniel J, Baker, William J, Morley, Robert J, Kissling, W Daniel, Hoorn, Carina (2021-12-16). The Cenozoic history of palms: Global diversification, biogeography and the decline of megathermal forests. GLOBAL ECOLOGY AND BIOGEOGRAPHY 31 (3) : 425-439. ScholarBank@NUS Repository. https://doi.org/10.1111/geb.13436
Abstract: Aim: Megathermal rain forests and mangroves are much smaller in extent today than in the early Cenozoic, primarily owing to global cooling and drying trends since the Eocene–Oligocene transition (c. 34 Ma). The general reduction of these biomes is hypothesized to shape the diversity and biogeographical history of tropical plant clades. However, this has rarely been examined owing to a paucity of good fossil records of tropical taxa and the difficulty in assigning them to modern clades. Here, we evaluate the role that Cenozoic climate change might have played in shaping the diversity and biogeography of tropical plants through time. Location: Global. Time period: Cenozoic, 66 Ma to present. Major taxa studied: Four palm clades (Calaminae, Eugeissoneae, Mauritiinae and Nypoideae) and their fossil pollen record. Methods: We compiled fossil pollen occurrence records for each focal palm lineage to reconstruct their diversity and biogeographical distribution throughout the Cenozoic. We use climatic niche models to project the distribution of climatically suitable areas for each lineage in the past, using palaeoclimatic data for the Cenozoic. Results: For most palm lineages examined, global pollen taxonomic diversity declined throughout the Cenozoic. Geographical ranges for each focal lineage contracted globally and experienced regional-scale extinctions (e.g., Afrotropics), particularly after the Miocene. However, climatic niche models trained on extant species of these focal lineages often predict the presence of climatically suitable habitat in areas where these lineages went extinct. Main conclusions: Globally, the decline in megathermal rain forest and mangrove extent might have led to declines in diversity and range contractions in some megathermal plant taxa throughout the Cenozoic. Although global climatic trends are an important backdrop for the biogeography and diversity of tropical groups at global scales, their continental- or regional-scale biogeographical trajectories might be more dependent on regional abiotic and biotic contexts.
Source Title: GLOBAL ECOLOGY AND BIOGEOGRAPHY
URI: https://scholarbank.nus.edu.sg/handle/10635/227606
ISSN: 1466-822X
1466-8238
DOI: 10.1111/geb.13436
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