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Publicly Available Published by De Gruyter October 18, 2012

Factors associated with moderate blooms of Pyrodinium bahamense in shallow and restricted subtropical lagoons in the Gulf of California

  • Lourdes Morquecho EMAIL logo , Rosalba Alonso-Rodríguez , José A. Arreola-Lizárraga and Amada Reyes-Salinas
From the journal Botanica Marina


We examined the environmental and biological factors related to blooms of the toxic dinoflagellate Pyrodinium bahamense in three shallow, restricted subtropical lagoons in the Gulf of California during the rainy summer. In the San José, Yavaros, and El Colorado lagoons, the vegetative stage peaked at 63, 108, and 151 (×103 cells l-1), respectively. At San José, production of cysts peaked at 9.7×103 g-1 of dry sediment mass as the bloom declined. Large diatoms predominated, with P. bahamense the most common dinoflagellate during the blooms. Abundance of P. bahamense at San José was positively correlated with salinity (r=0.50, p=0.0003), seawater temperature (r=0.44, p=0.005), silicates (r=0.45, p=0.003), and ammonium (r=0.32, p=0.005), and negatively correlated with dissolved oxygen (r=-0.34, p<0.0001). No such correlations were found at El Colorado and Yavaros. The environmental window that favors development of blooms is restricted to the summer and is influenced by seawater temperature, salinity, and relative concentrations of ammonium and phosphates that, in turn, depend on rainfall and runoff, which is greater on the eastern side of the Gulf where seawater quality is degraded.

Corresponding author: Lourdes Morquecho, Centro de ­Investigaciones Biológicas del Noroeste (CIBNOR), Instituto ­Politécnico Nacional 195, Col. Playa Palo de Santa Rita, La Paz, B.C.S. 23096, México

Received: 2012-6-17
Accepted: 2012-9-20
Published Online: 2012-10-18
Published in Print: 2012-12-01

©2012 by Walter de Gruyter Berlin Boston

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