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Studies on Plover Cove Reservoir, Hong Kong: composition and distribution of the phytoplankton and its relationship to environmental factors
Author(s) -
HODGKISS I. J.
Publication year - 1974
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1974.tb00082.x
Subject(s) - cove , phytoplankton , plover , environmental science , ecology , zooplankton , abundance (ecology) , nutrient , oceanography , biology , geography , archaeology , habitat , geology
Summary Phytoplankton counts and chemical/physical analyses were carried out twice weekly for 2^ years on samples taken from Plover Cove Reservoir, and a description of the variations in species composition and abundance is followed by an analysis of the effects of these environmental factors on algal growth, and their correlation with phytoplankton abundance. In addition, 24‐h surveys were carried out over a 1‐year period in an attempt to evaluate the seasonal, diurnal and vertical distribution patterns ofthe more abundant phytoplankters. Blue‐green algal blooms were greatest in winter 1967/68 and in autumn 1969; shoreline‐attached diatoms were prevalent in winter 1968/69 and winter 1969/70. The blue‐green algal blooms have been attributed to a high rate of phosphorus and nitrogen supply, and the occurrence of diatoms at such specific times to an increase in light penetration due to the paucity of phytoplankton at these times. Various well‐marked distribution patterns were seen, and the seasonal pattern in the case of Microcystis aeruginosa was shown to be closely correlated with fluctuations in certain chemical parameters, namely. ammonia‐N, nitrate‐N and phosphate concentrations. Predictions have been made concerning future trends in the algal community of the reservoir.