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Variability in brood size and female length of Euphausia pacifica among three populations in the North Pacific

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  • We compared brood sizes among adult female Euphausia pacifica Hansen, 1911 from 3 populations in the North Pacific: Puget Sound, Washington, USA; Toyama Bay, Japan; and the Oregon coast, USA. Additionally, we used multiple linear regression models to compare the interspecific brood size as a function of female length and location. The females from Oregon attained larger brood sizes (maximum 600 eggs brood–1, mean 152 eggs brood–1) and were longer (mean length 20.1 mm) than females from the other 2 regions (means: 96 eggs brood–1 and 15.9 mm; 113 eggs brood–1 and 18.5 mm for Puget Sound and Toyama Bay, respectively). The brood size for females from the 3 populations increased with size, reaching a maximum when females attained lengths ranging from 19 to 22 mm. The brood size decreased substantially for larger individuals. When the relationship between brood size and length was corrected for differences in female length, the median brood sizes were statistically indistinguishable among the 3 regions, indicating an inherent reproductive potential probably associated with the carapace volume available for the gonads for a given female length.
  • Keywords: Reproductive effort, Brood size, Euphausia pacifica, Intraspecific scaling, North Pacific
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  • Gomez-Gutierrez, J., Feinberg, L. R., Shaw, T., & Peterson, W. T. (2006, October 5). Variability in brood size and female length of Euphausia pacifica among three populations in the North Pacific. Marine Ecology Progress Series, 323, 185-194.
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  • 323
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  • This research was supported by 2 Mamie Markham Research Awards from Oregon State University, Hatfield Marine Science Center (HMSC) during 2001–2002 and 2003–2004. Ship time and staff assistance were provided by the Office of Naval Research (National Ocean Partnership Program) in 1999–2000, US GLOBEC program in 2001 to 2004, jointly funded by the National Science Foundation, National Oceanic and Atmospheric Administration, and the NSF/CoOP COAST program (2001 and 2003). J.G-G. was also supported by an SNI-II, COFAA–IPN, EDI-IPN fellowships, and a PhD CONACyT grant (122676) to study at Oregon State University (1998 to 2003).
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