Abstract
IntertidalEgregia menziesii(Turner) Aresch. populations were studied at three Southern California sites to determine temporal and spatial patterns of reproduction and morphology. The timing of sporophyll production and sporophyte recruitment was similar at all sites. Sporophyll production was much greater during winter periods of colder seawater temperatures and shorter day lengths. Sporophyte recruitment occurred from spring through midsummer, ∼5 months following maximal sporophyll production. Lateral blade morphologies varied in a consistent manner, suggesting a developmental mechanism for form variation inEgregiathalli. Spatulate blades dominated shorter axes and the bases of longer axes, whereas filiform laterals became abundant toward the tips of longer axes. Filiform laterals (9.8 mg O2·g−1·h−1) had higher light‐saturated net photosynthetic rates than spatulate laterals (6.8 mg O2·g−1·h−1), resulting in a 12% increase in the productivity ofEgregiaper meter of filiform frond.
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