Leaf-Fruit Trait Decoupling Along Environmental Gradients in Tropical Cryptocaryeae (Lauraceae)

Area of Science:

• Ecology
• Evolutionary Biology
• Botany

Background:

• The Cryptocaryeae tribe (Lauraceae) is ecologically and economically significant, with over 850 species originating in tropical Africa and Asia.
• Understanding plant trait responses to environmental changes is vital for forest ecosystem conservation.

Purpose of the Study:

• To investigate the influence of environmental factors on leaf and fruit morphological traits in the tropical tribe Cryptocaryeae.
• To analyze trait variations across geographical gradients and their relationship with environmental variables.

Main Methods:

• Compiled a dataset of 17,117 morphological observations for 369 Cryptocaryeae species, utilizing an established phylogenetic framework.
• Analyzed leaf (length, width, area) and fruit (length, diameter, size) traits in relation to latitude, longitude, and environmental factors.
• Quantified the relative contributions of environmental factors to observed trait variations.

Main Results:

• Leaf morphology displayed significant latitudinal and longitudinal zonation, demonstrating sensitivity to environmental fluctuations, particularly temperature.
• Fruit morphological traits showed conservative variation, primarily influenced by precipitation.
• Different plant traits exhibit distinct trade-off strategies for environmental adaptation.

Conclusions:

• Leaf and fruit traits of Cryptocaryeae trees respond differently to environmental factors, with leaves being more dynamic and fruits more stable.
• Integrating ecological and evolutionary perspectives is crucial for understanding plant adaptation strategies in tropical forests.