Scatter-hoarding rodents and marsupials: convergent evolution on diverging continents

Area of Science:

• Ecology
• Evolutionary Biology
• Tropical Forest Science

Background:

• Neotropical rainforests feature diverse fruit-eating animals, including scatter-hoarding rodents that bury seeds.
• Seed burial by these animals facilitates germination and seedling establishment away from the parent plant, contributing to forest structure.
• Recent research has identified similar seed dispersal roles for rodents in paleotropical forests of Southeast Asia.

Purpose of the Study:

• To investigate the ecological role of seed-dispersing animals in tropical forest regeneration.
• To compare seed dispersal mechanisms across different tropical regions (Neotropics and Paleotropics).
• To explore the evolutionary implications of seed dispersal by frugivores in tropical forest ecosystems.

Main Methods:

• Review of existing studies on scatter-hoarding rodents in Neotropical and Paleotropical rainforests.
• Analysis of ecological data on seed burial and germination rates.
• Comparative study examining the behavior of a frugivorous kangaroo in relation to seed dispersal.

Main Results:

• Neotropical rodents are confirmed as significant agents of seed dispersal, promoting plant establishment.
• Evidence from Southeast Asia indicates paleotropical rodents perform a comparable ecological function.
• A frugivorous kangaroo exhibits seed-dispersing behavior analogous to neotropical rodents, broadening the scope of known dispersers.

Conclusions:

• Seed dispersal by scatter-hoarding animals is a crucial process in both Neotropical and Paleotropical rainforests.
• The discovery of similar roles in different geographic regions highlights convergent evolution in seed dispersal strategies.
• The identification of a frugivorous kangaroo as a seed disperser offers new insights into the evolution of tropical forests and frugivore-plant interactions.