日本語
Research subject
Evolution of Fish Reproductive Strategies
Research
areas
Evolutionary biology
Research
keywords
Molecular evolution, co-evolution, adaptive evolution, teleost fish
Researcher 川口 眞理
Kawaguchi Mari
Job title Associate Professor
Affiliation Faculty of Science and Technology
Department of Materials and Life Sciences
Contact
URL

Abstract
Reproductive strategies of fish species are variable. While oviparous fish fertilize externally and release eggs into the water, ovoviviparous fish fertilize internally and their eggs hatch inside the maternal body. We are currently focusing on seahorse Hippocampus abdominalis, belonging to family Syngnathidae. The male seahorse has a unique organ called “brood pouch” on its ventral side of the body into which the female deposits her eggs. Male seahorses protect the eggs until hatching and later “give birth.” The brood pouch is found in all the syngnathid fishes, and it evolved from simple form to complicated form found in seahorse. Our research aims to reveal the formation mechanism and evolutionary process of the brood pouch.

Specific examples
This research will provide molecular mechanism in understanding how new organs form during evolution.
Future prospects
This research is a basic study that not only aims to reveal the functions of the brood pouch in seahorse, but also the evolutionary processes of brood pouch formation by comparing between syngnathid fishes.
Research facilities and equipments
Microtome, Cryostat, Confocal microscopy, real-time qPCR, high-speed liquid chromatography, spectrophotometer
Collaboration with external organizations
Microtome, Cryostat, Confocal microscopy, real-time qPCR, high-speed liquid chromatography, spectrophotometer
Related patents/papers
Mari Kawaguchi, Ryohei Okubo, Akari Harada, Kazuki Miyasaka, Kensuke Takada, Junya Hiroi, and Shigeki Yasumasu (2017) Morphology of brood pouch formation in the pot-bellied seahorse Hippocampus abdominalis. Zoological Letters, 3: 19.
DOI: 10.1186/s40851-017-0080-9
Mari Kawaguchi, Yuko Nakano, Ryouka Kawahara-Miki, Mayu Inokuchi, Makiko Yorifuji, Ryohei Okubo, Tatsuki Nagasawa, Junya Hiroi, Tomohiro Kono, and Toyoji Kaneko, 2016. An evolutionary insight into the hatching strategies of pipefish and seahorse embryos. Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, 326: 125-135.
DOI: 10.1002/jez.b.22670

Contact
Sophia University Bureau of Academic Research and Information
TEL:03-3238-3173 E-mail g_rant@cl.sophia.ac.jp