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Latitudinal variation in intertidal algal community structure: the influence of grazing and vegetative propagation

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Summary

The hypothesis that sea urchin grazing and interactions with turf-forming red algae prevent large brown algae from forming an extensive canopy in the low intertidal zone of southern California was tested with field experiments at two study sites. Experimental removal of sea urchins resulted in rapid algal recruitment. Crustose coralline algae which typically dominate the substratum in areas with dense urchin populations were quickly overgrown by several species of short-lived green, brown and red algae. The removal of urchins also significantly increased the recruitment of two long-lived species of large brown algae (Egregia laevigata and Cystoseira osmundacea at one study site and E. laevigata and Halidrys dioica at the other). The experimental plots at both sites were eventually dominated by perennial red algae.

A two-factorial experiment demonstrated that sea urchin grazing and preemption of space by red algae in areas where urchins are less abundant are responsible for the rarity of large brown algae in the low intertidal of southern California. The three dominant perennial red algae, Gigartina canaliculata, Laurencia pacifica and Gastroclonium coulteri, recruit seasonally from settled spores but can rapidly fill open space with vigorous vegetative growth throughout the year. These species encroach laterally into space created by the deaths of large brown algae or by other disturbances. Once extensive turfs of these red algae are established further invasion is inhibited. This interaction of algae which proliferate vegetatively with algae which recruit only from settled spores is analogous to those which occur between solitary and colonial marine invertebrates and between solitary and cloning terrestrial plants.

It is suggested that a north-south gradient in the abundance of vegetatively propagating species, in grazing intensity and in the frequency of space-clearing disturbances, may account for latitudinal variation in intertidal algal community structure along the Pacific coast of North America.

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Authors and Affiliations

  1. Department of Zoology, University of California, 94720, Berkeley, California, USA

    Wayne P. Sousa

  2. Department of Biological Sciences, University of Southern California, 90007, Los Angeles, California

    Stephen C. Schroeter

  3. Department of Zoology, Oregon State University, 97331, Corvallis, Oregon

    Steven D. Gaines

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  1. Wayne P. Sousa
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  2. Stephen C. Schroeter
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Sousa, W.P., Schroeter, S.C. & Gaines, S.D. Latitudinal variation in intertidal algal community structure: the influence of grazing and vegetative propagation. Oecologia 48, 297–307 (1981). https://doi.org/10.1007/BF00346486

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