Further transition states of the Baja California upwelling ecosystem

Journal Article · Tue Mar 01 04:00:00 EST 1977 · Limnol. Oceanogr.; (United States)

DOI:https://doi.org/10.4319/lo.1977.22.2.0264· OSTI ID:6646829

Walsh, J J ^[1]; Whitledge, T E; Kelley, J C; Huntsman, S A; Pillsbury, R D

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1. Brookhaven National Lab., Upton, NY

Measurements were made of wind, surface circulation, hydrography, nutrients, and phytoplankton and zooplankton rate processes in a time series at 27/sup 0/N during April 1973. A string of current meters and a towed acoustic body were also used to assess the distribution of subsurface currents and red crabs. The seasonal onset of upwelling had already occurred. Diatoms were initially the dominant primary producers. Two perturbations of the upwelling state were observed in response to relaxation of the winds. A comparison of this study with a preceding one in March 1972 indicates that the rate of upwelling, the nutrient content, and the phytoplankton specific growth rate were about the same in both years. The total productivity and biomass of the phytoplankton were less in 1973, implying that greater grazing stress was associated with a switch from smaller dinoflagellates to larger diatoms. Local temporal variability of upwelling off Baja California is postulated to have led to the replacement of clupeids by the red crab, Pleuroncodes planipes, as a facultative herbivore.

• OSTI ID: 6646829
• Journal Information: Limnol. Oceanogr.; (United States), Journal Name: Limnol. Oceanogr.; (United States) Vol. 22:2; ISSN LIOCA
• Country of Publication: United States
• Language: English

Related Subjects

520100* -- Environment
Aquatic-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALGAE
ANIMALS
AQUATIC ECOSYSTEMS
AQUATIC ORGANISMS
ARTHROPODS
CALIFORNIA
CRUSTACEANS
CURRENTS
DIATOMS
ECOSYSTEMS
GROWTH
INVERTEBRATES
LIMNOLOGY
NORTH AMERICA
NUTRIENTS
PACIFIC OCEAN
PHYTOPLANKTON
PLANKTON
PLANT GROWTH
PLANTS
SEAS
SURFACE WATERS
USA
WESTERN REGION
WIND
ZOOPLANKTON