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Time Variation in Phytoplankton Assemblages in a Subtropical Lagoon System after the 1982-1983 "El Nino" Event (1984 to 1986)

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Title:Time Variation in Phytoplankton Assemblages in a Subtropical Lagoon System after the 1982-1983 "El Nino" Event (1984 to 1986)
Authors:Garate-Lizarraga, Ismael
Beltrones, David A. Siqueiros
Date Issued:Jan 1998
Publisher:University of Hawaii Press
Citation:Garate-Lizarraga I, Beltrones DAS. 1998. Time variation in phytoplankton assemblages in a subtropical lagoon system after the 1982-1983 "El Nino" event (1984 to 1986). Pac Sci 52(1): 79-97.
Abstract:An analysis of seasonal and geographical distribution and
abundance of the total and separate fractions of phytoplankton (nanno- and
microphytoplankton) in the Magdalena-Almejas lagoon system was done after
the 1982-1983 "El Nino" event. In spite of its being in a subtropical region,
the annual variation of phytoplankton abundance in the area was similar to
the annual cycle of production of coastal lagoons in temperate regions. There
were two peaks of phytoplankton abundance, in spring and in autumn. The
upwelling and tidal currents enriching the waters of Bahia Magdalena were
responsible for the high concentrations of phytoplankton in the bay. Microphytoplankton
was the most important fraction throughout the study period.
Nannophytoplankton was somewhat abundant. Using principal component
analysis, seasonal variation and frequency were the two factors determining the
structure of species assemblages. Lowest values of diversity and dominance
were related to circulation patterns and to the phytoplankton blooms that
occurred throughout the year in Bahia Magdalena-Almejas. High values of
diversity and low dominance were estimated at those areas under the influence
of oceanic waters. The 1982-1983 El Nino caused a drastic drop in phytoplankton
abundance during 1984. The recuperation process was slow, starting
in 1985 and completed by 1986. Recorded increases in phytoplankton abundance
surpassed all previous records. "El Nino" caused changes in the structure
of the microphytoplankton assemblages. Species richness and specific diversity
diminished because of the occurrence of few species.
Appears in Collections: Pacific Science Volume 52, Number 1, 1998

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