Academic Degree

Doctor of Agriculture

Research Fields

Benthic Ecology, Ecosystem Ecology

Major Professional Backgrounds

April 2011–March 2013: Master course student, Graduate School of Bioresources, Mie University
April 2013–December 2014: Research staff, R&D department, Saraya Co., Ltd.
April 2015–March 2018: Doctoral course student, Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences, The University of Tokyo
April 2018–Present: Assistant Professor, Aquatic Ecology Division, Estuary Research Center, Shimane University

Research Interests

・ Community structures of macrobenthos in estuaries
・ Ecological role of cellulose digesting enzymes of estuarine macrobenthos
・ Biological production of lower trophic levels and food web structures in estuarine ecosystems

Affiliated Academic Societies

1) Japanese Association of Benthology  2) The Ecological Society of Japan  3) Carcinological Society of Japan

Research Keywords

・Benthic community　・Crab　・Food web　・Cellulose digestion　・Tidal flat　・Salt marsh　・Mangrove

Research Results

1. Papers (peer reviewed)

11. Kawaida S., Horinouchi M., Kurata K. Toda K. (2025) Differences in benthic assemblage structures between vegetated and unvegetated habitats in a salt marsh in Lake Shinji, western Japan. Fisheries Science 91: 33–46.

10. Kim K., Ando T., Nakamura Y., Hayashi S., Kawaida S. (2024) Clustering evaluation of water quality for various classes of in‑flow rivers in connected brackish lakes. Environmental Monitoring and Assessment 196: 501.

9. Nanjo K., Kawaida S., Doi H., Yamamori T. (2024) Food habits of fishes in salt marsh estuaries in the western Seto Inland Sea, Japan. Ichthyological Research 71: 305–316.

8. Kawaida S., Yamana Y., Tanita I., Nanjo K. (2023) First record of the sea cucumber Holothuria (Selenkothuria) erinaceus Semper, 1868 (Holothuroidea: Holothuriida: Holothuriidae) from a Japanese mangrove forest. Laguna 30: 61–70.

7. Abe H., Hoshino O., Yamada K., Ogino Y., Kawaida S., Sato-Okoshi W. (2022) A novel symbiotic relationship between ascidians and a new tunicboring polychaete (Annelida: Spionidae: Polydora). Zootaxa 5159 (1): 001–022.

6. 川井田俊・木村妙子（2022）三重県田中川干潟における絶滅危惧種トビハゼおよびキセルハゼの採集記録．Laguna 29: 1–7.

5. Kawaida, S., Nanjo, K., Ohtsuchi, N., Kohno, H., Sano, M., 2021. Crabs assimilating cellulose materials drive the detritus food chain in a mangrove estuary. Food Webs, 26, e00180 (2021.03)

4. Kawaida, S., Nanjo, K., Ohtsuchi, N., Kohno, H., Sano, M. (2019) Cellulose digestion abilities determine the food utilization of mangrove estuarine crabs. Estuarine, Coastal and Shelf Science 222, 43–52.

3. 川井田俊・大土直哉・河野裕美・渡邊良朗・佐野光彦（2018）琉球諸島西表島のマングローブ林に生息するフタバカクガニParasesarma bidensの落葉摂食量．La mer 56, 37–47.

2. Kawaida S., Nanjo K., Kanai T., Kohno H., Sano M. (2017) Microhabitat differences in crab assemblage structures in a subtropical mangrove estuary on Iriomote Island, southern Japan. Fisheries Science 83, 1007–1017.

1. Kawaida S., Kimura T., Toyohara H. (2013) Habitat segregation of two dotillid crabs Scopimera globosa and Ilyoplax pusilla in relation to their cellulase activity on a marsh-dominated estuarine tidal flat in central Japan. Journal of Experimental Marine Biology and Ecology 449, 93–99.

2. Papers (not peer reviewed)

2. Kawaida S. (2019) Habitat segregation of crabs in relation to resource utilization patterns in a mangrove estuary: Focusing on cellulose digestion ability. Cancer 28, 65–69.[in Japanese]

1. Kawaida S., Nanjo K., Kanai T., Kohno H., Sano M. (2017) Crab assemblage structures in a subtropical mangrove estuary on Iriomote Island, southern Japan. The Study Review of Iriomote Island, Okinawa Regional Research Center, Tokai University 2017, 1–15. [in Japanese]

3. Books

1. Kon K., Yamashiro H., Horinouchi M., Kawaida S. (2020) Experimental design in marine ecology. In: Inaba, K., Hall-Spencer, J.M., eds., Japanese Marine Life - A Practical Training Guide in Marine Biology, Springer, pp. 273-282.

4. International Symposiums

7. Kawaida S., Kimura, T.: Cellulose digestion abilities determine trophic segregation of crabs and gastropods in a marsh-dominated estuarine tidal flat. The Fifth Asian Marine Biology Symposium, The Emerald Hotel, Bangkok. 29 October 2024.

6. Miki, M., Kawaida S., Kurata, K.: Relationship between seaweed beds and invertebrate communities in Lake Nakaumi, Japan ECSA 60: Implementing Science-Based Solutions and Strategies for Coastal Resilience, China. 2024.

5. Ando T., Seto K., Katsuki K., Nakamura Y., Kim S., Kawaida S., Saito Y.: Relationship between transportation and palynofacies/palynomorph assemblage of suspended sediments in the rivers around Lake Shinji and Nakaumi Lagoon. JpGU Meeting 2022, Makuhari Messe, Mihama-ku, Chiba, Japan, 22-27 May 2022.

4. Kawaida S., Nanjo K., Ohtsuchi N., Kohno H., Sano M.: The role of crabs having cellulose digestion ability in mangrove organic carbon processing. The Fourth Asian Marine Biology Symposium, Howard Civil Service International House, Taipei, Taiwan. November 2019.

3. Kawane M., Dantsuji Y., Kawaida S., Sekino M, Yusa Y.: Reproductive success of dwarf males and hermaphrodites in Octolasmis unguisiformis. Open International Symposium: Reproductive Biology of Barnacles, Shinagawa Campus, Tokyo University of Marine Science and Technology, Japan. October 2019.

2. Abe, H., Yamada, K., Hoshino, O., Ogino, T., Kawaida, S., Sato-Okoshi ,W.: A novel symbiotic relationship between ascidians and an undescribed tunic-boring polychaete (Annelida: Spionidae: Polydora). 13th International Polychaete Conference, California, U.S.A. August 2019.

1. Kawaida, S., Toyohara, H., Kimura, T. Cellulase activity of ocypodid crabs on the Tanakagawa tidal flat, central Japan. The First Asian Marine Biology Symposium, Phuket, Thailand. December 2012.