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- W2322751337 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 418:179-188 (2010) - DOI: https://doi.org/10.3354/meps08824 Impacts of shifts in spawning seasonality and size at maturation on the population growth of mantis shrimp in Tokyo Bay Mifuyu Nakajima1,2,3,*, Keita Kodama1, Toshihiro Horiguchi1, Yoshinari Tanaka1, Hiroaki Shiraishi1 1Research Center for Environmental Risk, National Institute for Environmental Studies, Japan, 16-2 Onogawa, Tsukuba-City, Ibaraki 305-8506, Japan 2Department of Zoology, University of Hawaii, 2538 McCarthy Mall, Edmondson 152 Honolulu, Hawaii 96822, USA 3Present address: Department of Biology, Stanford University, Stanford, California 94305, USA *Email: mifuyunf@06.alumni.u-tokyo.ac.jp ABSTRACT: The spawning season of mantis shrimp Oratosquilla oratoria (Stomatopoda) in Tokyo Bay has changed from being unimodal (spring only) to bimodal (spring and summer).This shift in the pattern of spawning arose because reproductive maturation began to occur in smaller females, which presumably spawn in summer, and because the proportion of smaller mature females increased. Currently, recruitment appears to depend entirely on the summer cohort because of significantly lower juvenile survival in the spring cohort. In this study, we propose that the new summer spawning period and spawning by smaller-bodied individuals have supported the population. Our size- and age-structured mathematical model of O. oratoria population dynamics indicated that the number of eggs spawned in spring is lower than that in summer, and 98% of the annual recruitment is currently derived from summer spawning. The model also suggested that smaller-bodied spawners provided 84% of total recruitment and that if the proportion of smaller-bodied mature females had not increased, the population would have shown a larger decline than was observed. In reality, the stock size of O. oratoria has become extremely low, damaging the local fishery. Based on our model predictions, an efficient solution for population recovery is to reduce the mortality of small, unsalable individuals, which are currently fished and discarded. KEY WORDS: Discarding · Life history · Oratosquilla oratoria · Recruitment · Seasonal survival · Settlement inhibition · Stomatopoda · Structured-population model Full text in pdf format Supplementary material PreviousNextCite this article as: Nakajima M, Kodama K, Horiguchi T, Tanaka Y, Shiraishi H (2010) Impacts of shifts in spawning seasonality and size at maturation on the population growth of mantis shrimp in Tokyo Bay. Mar Ecol Prog Ser 418:179-188. https://doi.org/10.3354/meps08824 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 418. Online publication date: November 18, 2010 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2010 Inter-Research." @default.
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