Economo Lab Personnel


Masashi Yoshimura, Staff Scientist

I am interested in morphological evolution and systematics of ants based on comparative studies using males. Male ants are unexplored resource for understanding ants’ evolution and diversity, because most part of our current morphological knowledge for ants is based on the workers, which are non-reproductive females. Detailed morphological examinations of male ants and male-female comparative studies following recent molecular phylogenetic studies will provide new remarkable characters that demonstrate their morphological evolution.

Georg Fischer, Postdoctoral Researcher

I am interested in ant community ecology as well as biogeographic and evolutionary patterns, especially of diverse tropical ant assemblages. A big part of my work in the last years and during my current project is the taxonomy, biogeography and evolution of the extremely species rich and ecologically highly diverse genus Pheidole, and recently also of the genus Carebara, both of which are characterized by a pronounced worker differentiation into di- and polymorphic subcastes respectively. In both genera there are several cases of species which don’t follow the general “rules” and either developed an additional worker subcaste (often named supersoldiers or supermajors) or lost one or more of their worker castes. I’d like to find out more about their respective ecologies and possible underlying evolutionary patterns.

Cong Liu, Graduate Student

I spent three years in the tropical forest (Xishuangbanna, China) to study fig and fig wasp mutualism for my Master’s degree. My research at that time was to answer how and why the body size of fig wasps evolved and its implications for stability in a fig-pollinator mutualism. I also did a lot of works about the behavior and pollination biology of fig wasps. During the time in the tropical forest, I had developed a broad interest in ecology, such as entomological ecology, evolutionary ecology, conservation, biogeography, plant-animal interaction and biodiversity. So after I got my master’s degree from the Chinese Academy of Sciences, I decided to pursue my Ph.D degree in OIST. I enjoy the peaceful life here where people live in great harmony. OIST is a paradise for researchers where my ideas can incubate. Since joining the lab I have been working on ant cuticular hydrocarbons, ant community ecology in China, and the optical properties of ant cuticle.

Chisa Oshiro, Research Administrator           

I was born in Okinawa but went to the United States to get a Master’s degree in American Literature with a focus on environmental literature. I wrote about the relationship between humans and nature by comparing the thoughts of great authors, artists, and architects. I also wrote about culture, language, and identity. The mixture of these ideas gave me the desire to return to Okinawa with the goals of spreading public education, preserving nature, and improving self-reliant economic development in Okinawa. I am overjoyed to have the opportunity to pursue these goals at OIST by using my past administrative experience to help the everyday operations of Arilab’s research.


Masako Ogasawara, Research Technician

New to the world of ants, I am now learning about their biology. In Arilab I help processing the field samples and curating the ant collection. So far, I have had the chance to work with ants from different places around the world including Fiji islands, China and Okinawa! I am originally from Yokohama in Japan, but have lived in Okinawa for thirteen years where I enjoy every day the beautiful landscapes and nature of the island.

Kenneth Dudley, GIS & Remote Sensing Technician

I graduated from the University of Utah with undergraduate degrees in Geography, Japanese, and Environmental & Sustainability Studies. I then continued my studies in geography and obtained an MS in Geography at the University of Utah. My primary area of interest is remote sensing of vegetation using multispectral and hyperspectral datasets. I work with GIS and remote sensing datasets to study and model environmental phenomena. In my free time I create and update tools to improve processing of remote sensed images using Python and ENVI/IDL.


Patricia Wepfer, PhD Student

I am generally interested in spatial patterns of biodiversity and evolution in the context of biophysical/-geographical processes. In my PhD project I aim to understand diversification and connectivity in hard corals on the example of the genus Galaxea (Oculinidae). For this I collect fresh samples and museum specimens from all their Indo-Pacific distribution range and analyze them with population genomic tools. Other interests and previous projects include traditional botany, community ecology of ants and the variation in the symbiotic community in corals.

Julia Janicki, Research Technician

I received my M.S. in Entomology from UW-Madison, focusing on beetle taxonomy and biodiversity; specifically, I conducted a survey of the primitive weevils in Wisconsin. While taking on my project, I became interested in ways of visualizing data and took up skills in interactive mapping and front-end web development. As part of my M.S. project I created an interactive web mapping application for my survey results. I recently helped develop  My interests include biodiversity, conservation, evolutionary biology, taxonomy, cartography, data visualization, and web development.



  Nick Friedman, Postdoctoral Researcher

​  I am interested in the origins of biodiversity: how did we get so many species, and how did they get to be so different from one another? My research focuses primarily on trait evolution, examining the history of evolutionary change, how trait physiological has changed, and what selective context explains the cause of that change. I use the Australian honeyeaters and allies (Meliphagoidae) as a model clade to study the evolution of morphology and elaborate plumage coloration in birds. I want to understand how these traits are driven by natural and sexual selection in different ways across the various biomes of Australia and Papua New Guinea. In the Biodiversity and Biocomplexity Unit at OIST, I also use these phylogenetic comparative approaches to explore patterns and mechanisms of diversification and disparification in ants.

Clive Darwell, Postdoctoral Researcher​

I am interested in how biodiversity is structured within ecosystems and what patterns and processes can be identified to describe and explain it, and more specifically, in how ecological interactions in conjunction with the evolutionary and biogeographical histories of species determine the composition, structure and function of biodiversity. I am also interested in how these relationships are maintained or modified according to both environmental factors (e.g., climate change) and additional biotic pressures (e.g., in the face of competition, predation, or parasitism). Before moving on to ants, I have studied the fig-wasp and yucca-moth obligate mutualism systems in previous research.


Takuma Yoshida, Technician

I studied the systematics of the parasitoid wasp family Ichneumonidae as part of my graduation thesis at the laboratory of Systematic Entomology, Hokkaido University. In order to get an idea of their diversity on a global scale, I have been putting a lot of effort into collecting, making and managing specimens, which also led me to become interested in collection management. I have experience as a curation assistant at the Hokkaido University Museum and Muséum National d’Histoire Naturelle of Paris and have been learning how to manage insect collections. At OIST I am involved in the OKEON (OKinwa Environment Observation Network) project. My task is to manage insect specimens collected for this project. I train para-taxonomists and guide them to collect and sort insect samples from twenty-four sampling sites set up around Okinawa.