Abstract
At Bahia Kino, Mexico, seeds of Zostera marina L. (eelgrass) germinate in October and early November. By January seedlings are widespread throughout the area. A very rapid vegetative growth ensues. By March all eelgrass at the depth limit (7 m) is flowering; and most is flowering in shallow water (low tide to 4 m depth). In April all plants are in flower; a few plants display mature seeds. Windrows of detached plants occur on the beaches. In May all reproductive plants have mature seeds, and few attached plants remain. In July all eelgrass in the area has disappeared. All reproductive activities and plant detachment are completed before the lethal upper limit for the species is reached (30°C). Thus, eelgrass at Bahia Kino is a true annual and represents an ultimate response to high water temperatures.
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