Seasonal variation of the phytoplankton community in tuna farms in Bahia de La Paz, southern Gulf of California, Mexico

The phytoplankton community of tuna farms in Bahia de La Paz, southern Baja California, Mexico was studied. Samples were taken from tuna farms near San Juan de la Costa, Rancheros del Mar and from a station in El Mogote, away from the influence of these farms. Water samples were collected monthly (J...

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Bibliographic Details
Published in:Latin american journal of aquatic research 2018-11, Vol.46 (5), p.1011-1024
Main Authors: Mucino, Rocio, Garate, Ismael, Lopez, David, Bustillos, Jose, Hernandez, Francisco
Format: Article
Language:eng ; por
Subjects:
Abundance
Agricultural economics
Algae
Aquaculture
Blooms
Chlorophyll
Chlorophyll a
Communities
Diatoms
Dissolved oxygen
Farms
FISHERIES
MARINE & FRESHWATER BIOLOGY
Mineral nutrients
Nutrient concentrations
Nutrients
OCEANOGRAPHY
Phytoplankton
Plankton
Seasonal variation
Seasonal variations
Temperature measurement
Tuna
Water analysis
Water column
Water sampling
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Summary:The phytoplankton community of tuna farms in Bahia de La Paz, southern Baja California, Mexico was studied. Samples were taken from tuna farms near San Juan de la Costa, Rancheros del Mar and from a station in El Mogote, away from the influence of these farms. Water samples were collected monthly (June 2006-May 2007) with a van Dorn bottle at different depths in San Juan de la Costa (0, 25 and 50 m), Rancheros del Mar (0, 15 and 30 m) and El Mogote (0 m) to measure temperature, dissolved oxygen, inorganic nutrients, and chlorophyll-a and to determine phytoplankton composition and abundance. The index of simple dominance, Shannon-Weaver diversity, and Pielou evenness were estimated. The water column was stratified from June to September (~27.5[degrees]C) and mixed from October to May (~18.5[degrees]C). Nutrient concentrations at the three sampling sites did not increase significantly. Nanophytoplankton dominated, followed by microplanktonic diatoms, and the highest diatom abundance occurred during the warm period. The phytoplankton community was more diverse in San Juan de la Costa than in Rancheros del Mar. In the latter, a superficial bloom of the cyanobacterium Trichodesmium erythraeum (1630 x [10.sup.3] cel [L.sup.-1]) occurred in September, and in San Juan de la Costa the diatom Pseudo-nitzschiafraudulenta reached the highest abundance (183.8 x [10.sup.3] cel [L.sup.-1]) in July.
ISSN:0718-560X
0718-560X
DOI:10.3856/vol46-issue5-fulltext-14