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Algal seasonality on an exposed rocky shore in Hong Kong and the dietary implications for the herbivorous crab Grapsus albolineatus

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Abstract

Patterns of algal seasonality, and their effect on the diet and feeding preferences of the herbivorous crab Grapsus albolineatus were investigated over an 18-mo period from March 1993 to August 1994 on an exposed tropical rocky shore (Hok Tsui Peninsula at Cape d' Aguilar, Hong Kong). Algal cover was greatest in the winter months, and lowest in the summer. Foliose algae such as Ulva fasciata, Porphyra suborbiculata, and Dermonema frappieri were dominant in the winter, but died off in the summer. During the hot summer months, perennial encrusting algae e.g., Ralfsia expansa, Hildenbrandia rubra, H. occidentalis, coralline crusts and the encrusting cyanobacteria Kyrtuthrix maculans, were the dominant algal species. Seasonal variation in algal abundance influenced the dietary selectivity of the herbivorous crab G. albolineatus. In the winter, the crab fed selectively on filamentous algae (e.g. Hincksia spp., Cladophora spp., Enteromorpha spp., and the cyanobacteria Lyngbya sp.). Foliose algae (e.g. U. fasciata, P. suborbiculata, Pterocladia tenuis) formed a small part of the diet, despite being the dominant species on the shore. Foliose and filamentous algae were virtually absent from the shore in the summer, and the crabs switched to feeding solely on encrusting algae. Electivity indices revealed preferences for green and brown turf species, and avoidance of foliose algae. Faecal analysis revealed that a greater proportion of the food is digested in the winter, suggesting that G. albolineatus is able to digest filamentous algae more efficiently than encrusting algae. Feeding preferences of G. albolineatus appear to be influenced by a number of factors, including the availability, digestibility and morphology of algae. The foraging behaviour and cheliped morphology of the crab also affect food choice. The monsoonal nature of Hong Kong's climate controls the diversity and abundance of intertidal algae and, therefore, indirectly influences the diet and subsequent growth and reproductive success of the herbivorous crab G. albolineatus.

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Authors and Affiliations

  1. The Swire Institute of Marine Science, The University of Hong Kong, Cape d' Aguilar, Shek O, Hong Kong

    Robin Kennish, Gray A. Williams & S. Y. Lee

  2. Department of Ecology and Biodiversity, The University of Hong Kong, Cape d' Aguilar, Shek O, Hong Kong

    Robin Kennish, Gray A. Williams & S. Y. Lee

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  1. Robin Kennish
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  2. Gray A. Williams
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  3. S. Y. Lee
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Communicated by O. Kinne, Oldendorf/Luhe

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Kennish, R., Williams, G.A. & Lee, S.Y. Algal seasonality on an exposed rocky shore in Hong Kong and the dietary implications for the herbivorous crab Grapsus albolineatus . Marine Biology 125, 55–64 (1996). https://doi.org/10.1007/BF00350760

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  • DOI: https://doi.org/10.1007/BF00350760

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