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- W1515098511 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 455:173-194 (2012) - DOI: https://doi.org/10.3354/meps09631 Seasonal growth, molt, and egg production rates of Nyctiphanes simplex (Crustacea: Euphausiacea) juveniles and adults in the Gulf of California Jaime Gómez-Gutiérrez1,*, Samuel Martínez-Gómez1, Carlos J. Robinson2 1Departamento de Plancton y Ecología Marina, Centro Interdisciplinario de Ciencias Marinas, Instituto Politécnico Nacional, Av. IPN s/n, Col. Playa Palo de Santa Rita, La Paz, Baja California Sur, 23096, Mexico 2Laboratorio de Ecología de Pesquerías, Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, AP 70-305, México, Distrito Federal 04510, Mexico *Email: jagomezg@ipn.mx ABSTRACT: Seasonal distribution of biomass and somatic growth, molt, and egg production rates of Nyctiphanes simplex were estimated in the Gulf of California (November 2005, January 2007 and July 2007) and associated with 12 environmental variables to define the conditions in which the higher biomass production rates occur. Daily growth rates, estimated from shipboard incubations, indicated that N. simplex did not grow or decreased in size in all the seasons, with higher proportions of animals in these 2 growth categories in July (21 and 52%, respectively) than in January (7 and 43%) and November (35 and 12%). Thus, the proportion of individuals that grew was higher in November (53%) and January (50%) than in July (27%). Mean juvenile and adult intermolt period (IMP) based on direct measurements was 5 d in January (range: 3 to 7 d), 3.8 d in July (2 to 8 d) and 4.4 d (3 to 7 d) for September to October 2010 (used as proxy for November, since not enough IMP data were available for that month). Calculations based on the inverse molting rate method estimated higher mean IMP (6.7 d; range 4 to 60 d). N. simplex mean (±SD) juvenile and adult daily total biomass production rate was 0.16 ± 0.13 mg DW m−3 d−1 (DW = dry weight) and mean annual integrated production was 71 ± 58 mg DW m−3 yr−1. The greatest contribution to N. simplex biomass production was through somatic growth (46%), followed by molts (32%) and eggs (22%). N. simplex had high biomass and biomass production rates mostly in regions with <100 m seafloor depth, in the northeast Gulf during November, northwest during January, and along the central east coast of the Gulf during July, associated with upwelling conditions that geographically change with winter anticyclonic and summer cyclonic surface circulation. Thus, numerous predators that energetically depend on this prey must seasonally change their distribution pattern to detect the spatially variable centers of N. simplex biomass production in the Gulf of California. KEY WORDS: Nyctiphanes simplex · Biomass production · Body growth · Molts · Eggs · Gulf of California Full text in pdf format PreviousNextCite this article as: Gómez-Gutiérrez J, Martínez-Gómez S, Robinson CJ (2012) Seasonal growth, molt, and egg production rates of Nyctiphanes simplex (Crustacea: Euphausiacea) juveniles and adults in the Gulf of California. Mar Ecol Prog Ser 455:173-194. https://doi.org/10.3354/meps09631 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 455. Online publication date: May 30, 2012 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2012 Inter-Research." @default.
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- W1515098511 title "Seasonal growth, molt, and egg production rates of Nyctiphanes simplex (Crustacea: Euphausiacea) juveniles and adults in the Gulf of California" @default.
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