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Resource Ecology Lab
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An ecology lab that explores how marine resource species such as squid, shellfish, and fish live.
AboutAbout the lab
Uncovering the lives of marine animals
The lab studies marine animals that humans use as resources, focusing on the mechanisms behind natural fluctuations in their numbers and their survival strategies.
The maturation and spawning of marine animals, the growth and survival of their offspring, and their migration all vary with the marine environment.
The lab focuses on the reproduction and life history of cephalopods such as squid, as well as shellfish and fish, and also investigates the ecology of closely associated organisms.
Through diving-based field surveys and rearing experiments, the lab places importance on direct contact with living organisms and careful observation.
Key terms
- Cephalopods
- A collective term for squid, octopuses, and their relatives. They have a well-developed brain among invertebrates.
- Benthic animals
- Animals that live on or in the rocks, sand, or mud of the seafloor, such as shellfish, crabs, and sea urchins.
- Alternative reproductive tactics
- The presence of multiple types of individuals with different ways of reproducing within the same species and the same sex.
NewsLab news
Paper published on arm growth in the Ezo-hariika cuttlefish, which courts using polarized light
Paper on polarized-light courtship signals in the Ezo-hariika cuttlefish published in PNAS
Paper on alternative reproductive tactics in the Japanese spear squid published in Marine Biology
Paper on how the Japanese pygmy squid uses its ink published in Journal of Ethology
Assistant Professor Saruwatari received the Best Presentation Award
ResearchResearch themes
The lab aims to clarify the mechanisms of natural fluctuation and the survival strategies of marine living resources whose populations vary greatly with changes in the marine environment. It studies the reproductive ecology, life-history strategies, interspecific relationships, and population dynamics of fishery target species such as cephalopods, shellfish, and fish.
*Illustrative imageEcology of benthic animals such as shellfish and sea urchins
The lab studies the ecology of benthic animals living on coastal seafloors, including mollusks, crustaceans, and echinoderms. It also examines the interspecific relationships surrounding abalone and sea urchins and their effects on population fluctuations.
*Illustrative imageCourtship and communication in cephalopods
Using rearing and behavioral observation, the lab investigates the interactions among individuals that cephalopods show during reproduction, such as courtship performed by instantly and partially changing body color. It also explores sperm competition after copulation and sexual conflict.
*Illustrative imageHow intraspecific variation in squid is maintained
The lab studies why individuals that differ greatly in behavior, morphology, physiology, and life history coexist within the same species. Using alternative reproductive tactics in coastal squid as a model, it explores how such diversity is maintained.
*Illustrative imageThe marine environment and population characteristics
Life-history traits such as size at maturity and number of eggs spawned vary greatly with water temperature and food conditions. By comparing populations from different seasons and sea areas, the lab examines how fluctuations in the marine environment affect populations.
MembersFaculty
The lab's members consist of faculty, researchers, doctoral students, and administrative assistants.
- Associate ProfessorYoko IwataPublications ↗
- Associate ProfessorJun HayakawaPublications ↗
- Assistant ProfessorToshiro SaruwatariPublications ↗
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Golden Cuttlefish (Sepia esculenta) ( )” Rickard Zerpe / CC BY 2.0 (cropped)
- Ecology of benthic animals such as shellfish and sea urchins: “Erizo de mar violáceo (Sphaerechinus granularis), Madeira, Portugal, , DD 40” Diego Delso / CC BY-SA 4.0 (cropped)
- Courtship and communication in cephalopods: “Mating cuttlefish” Vicmicallef / CC BY-SA 4.0 (cropped)
- How intraspecific variation in squid is maintained: “Heterololigo bleekeri in Sendai Umino-Mori Aquarium” Kinori / CC0 (cropped)
- The marine environment and population characteristics: “Squid eggs on Cobble Beach ( )” BLM Oregon & Washington / Public domain (cropped)
- Related lab (
行動生態計測分野(坂本研究室)): “Loggerhead Sea Turtle (Caretta caretta) ( )” Cliff from Arlington, Virginia, USA / CC BY 2.0 (cropped) - Related lab (水産化学研究室): “Fish on ice. ( )” Bernard Spragg. NZ from Christchurch, New Zealand / CC0 (cropped)
- Related lab (海洋生態系
変動分野): “SHINSEI-MARU” Pointerseven / CC BY-SA 4.0 (cropped) - Related lab (水圏生物環境学研究室): “Marine plankton - Dinoflagellat (Neoceratium horridum), diatom (Coscinodiscus radiatus) - 160x ( )” Picturepest / CC BY 2.0 (cropped)
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