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dc.contributor.authorIto, Sayaka
dc.contributor.authorNakagawa, Toru
dc.contributor.authorShirafuji, Norio
dc.contributor.authorYokota, Takashi
dc.contributor.authorIzumida, Daisuke
dc.contributor.authorOnitsuka, Toshihiro
dc.contributor.authorKuroda, Hiroshi
dc.contributor.authorUnuma, Tatsuya
dc.contributor.authorWatanabe, Tsuyoshi
dc.identifier.citationIto, S., Nakagawa, T., Shirafuji, N., Yokota, T., Izumida, D., Onitsuka, T., Kuroda, H., Unuma, T., & Watanabe, T. (2023). Distribution pattern and habitat use of the protandrous shrimp Pandalus latirostris in relation to environmental characteristics in Akkeshi waters on the pacific coast of eastern Hokkaido, Japan. Regional Studies in Marine Science, 67, 103198.
dc.description.abstractA sampling of the protandric shrimp, Pandalus latirostris, was conducted at fixed sites from July 2015 to March 2020 in Akkeshi Bay and the connecting Lake Akkeshi on the Pacific coast of eastern Hokkaido. Based on the occurrence pattern of P. latirostris, most individuals begin mating as males at Age-1, followed by a sex change to females, spawn eggs as females at Age-2, and hatch their eggs in the spring of Age-3. Pre-hatching ovigerous females were mainly found in eelgrass beds near and in Lake Akkeshi, where the water temperature was relatively high. The females probably migrate there to hatch their eggs, making sure of the high survival and growth of the hatched larvae. Juveniles and small males were also abundant in near and in Lake Akkeshi, indicating that many larvae remained in the eelgrass beds where they hatched. These eelgrass beds play an important role in the maintenance of the shrimp population as a major egg-hatching site and nursery habitat in Akkeshi waters. With ontogenetic development, the occurrence rate of P. latirostris gradually increased on the offshore side of Akkeshi Bay, with its body size being larger. As P. latirostris grow, they will probably disperse to the offshore side of Akkeshi Bay. However, the density of P. latirostris in the eelgrass bed in the bay near the lake was extremely high, with its strong preference at all ontogenetic stages. This eelgrass bed would help maintain the shrimp population as a “key habitat” for the shrimp. The site-specific environmental characteristics of vegetation beds influence the distribution and abundance of individuals within a population of P. latirostris through their growth and the associated change in habitat preference. In this study, the importance of maintaining the diverse habitats of P. latirostris will be discussed as part of the shrimp stock management measures.en
dc.subject.lcshGender transitionen
dc.titleDistribution pattern and habitat use of the protandrous shrimp Pandalus latirostris in relation to environmental characteristics in Akkeshi waters on the pacific coast of eastern Hokkaido, Japanen
dc.citation.journalTitleRegional Studies in Marine Scienceen
dc.subject.asfahabitat selectionen
dc.subject.asfageographical distributionen
dc.subject.asfaenvironmental factorsen
dc.subject.asfalife cycleen
dc.subject.asfatemporal variationsen
dc.subject.asfaspatial variationsen
dc.subject.asfashrimp fisheriesen
dc.subject.scientificNamePandalus latirostrisen
local.subjectPandalus latirostrisen
local.subjectProtandric shrimpen
local.subjectHabitat useen
local.subjectLife historyen
local.subjectSex changeen
local.subjectStock managementen

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  • Journal Articles [1221]
    These papers were contributed by Department staff to various national and international journals.

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