island-ecology
Island ecology examines how plants and other organisms evolve, disperse, and interact within the isolated, bounded environments of islands. The unique conditions of islands — geographic isolation, limited gene flow, and abundant unfilled ecological niches — drive rapid speciation and the evolution of striking plant adaptations found nowhere else on Earth. For plant scientists, island ecosystems serve as natural laboratories for studying colonization dynamics, adaptive radiation, and the vulnerability of endemic flora to extinction.
open_in_new WikipediaPubMed · 2026-04-28
A study of Palmyra Atoll found that pisonia trees — the keystone rainforest species of remote Pacific islands — depend entirely on a specific group of fungi called Tomentella to survive the extreme nutrient conditions created by seabird droppings. Crab burrowing also boosts fungal diversity, suggesting animal activity shapes the hidden fungal networks that hold island ecosystems together.
Pisonia trees are obligately (exclusively) dependent on Tomentella fungi, which are uniquely adapted to survive the nutrient-extreme conditions caused by concentrated seabird guano.
Tomentella fungal abundance across the atoll was directly predicted by distance to pisonia trees, showing the fungi spread outward from their host.
Crab burrowing was associated with increased soil fungal diversity, including species that are new to science or globally rare.
