| 要旨トップ | 目次 | | 日本生態学会第73回全国大会 (2026年3月、京都) 講演要旨 ESJ73 Abstract

一般講演（口頭発表） N01-11 （Oral presentation）

#### A preliminary assessment of phytochemical diversity across Okinawa's landscape【E】

*Amy Hana MORRELL, David ARMITAGE（OIST Graduate School）

As sessile organisms, plants rely on functional traits for their survival, growth, and reproduction. Functional traits are the measurable traits of an organism, including leaf morphology, overall C:N ratio, and photosynthetic rate. Looking at the traits of species, rather than taxonomic measurements of diversity, can equip us to better understand ecosystem processes. Plant secondary metabolites (PSMs) are functional traits of high interest because they can influence above- and belowground organisms. While plant primary metabolites are used for growth and development, PSMs play a major role in ecological functions such as by attracting pollinators, deterring natural predators, and outcompeting neighboring plants through mechanisms such as allelopathy. PSMs released into the soil through root exudates or through the leaching of decomposing organic matter can also impact belowground microorganisms involved in decomposition. To understand how leaf litter PSMs indirectly influence these ecosystem processes by their direct impact on decomposer microorganisms, we are measuring the PSM diversity of flora across Okinawa, while also examining decomposition rates. Using established sites throughout the main island of Okinawa, we are collecting leaf tissue of both trees and understory plants for untargeted chemical profiling using LC-MS instrumentation. A qualitative and quantitative analysis will reveal what chemical classes are present (e.g. flavonoids, phenolic acids, etc.) and at what quantities. Here I present preliminary work from a single field site, a forest near OIST campus. I will discuss the chemical profiles of plants within the site and decomposition rates measured using the Tea Bag Index. Coupling PSM analysis with decomposition rates can help to deepen our understanding of how organismal functional traits can impact larger ecosystem processes.

日本生態学会