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Zooplankton Biomass Variability in the Mexican Eastern Tropical Pacific

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Title:Zooplankton Biomass Variability in the Mexican Eastern Tropical Pacific
Authors:Franco-Gordo, Carmen
Godinez-Dominguez, Enrique
Suarez-Morales, Eduardo
Date Issued:Apr 2001
Publisher:University of Hawai'i Press
Citation:Franco-Gordo C, Godinez-Dominguez E, Suarez-Morales E. 2001. Zooplankton biomass variability in the Mexican eastern tropical Pacific. Pac Sci 55(2): 191-202.
Abstract:The time and space distribution of zooplankton biomass recorded
during a year cycle (December 1995-1996) off the Pacific coast of central
Mexico is analyzed. Samples were obtained by surface (42-86 m) oblique hauls
at 12 sampling sites using a Bongo net. The overall average displacement volume
biomass of zooplankton during the surveyed period was 1138 cm3
1000 m3• Principal component analysis indicated that highest biomass concentrations
occurred at coastal stations. The months with highest biomass values
were those in which the lowest sea surface temperature values occurred (January-
May). This was the same period in which the California Current was
strongest and clearly influenced the hydrological conditions of the surveyed
area. In these months, advective processes are active along the outer shelf,
favoring upwelling of colder, relatively nutrient-richer waters that promote an
overall local increase of zooplankton activity and populations. The high variability
of biomass values is indicative of episodic, localized processes that enhance
productivity in the area.
Appears in Collections: Pacific Science Volume 55, Number 2, 2001

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