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Free Content The Occurrence of Pugettia Richii (Crustacea: Decapoda) on Cystoseira Osmundacea Follows a Diel Pattern

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The occurrence of the spider crab Pugettia richii on the kelp Cystoseira osmundacea was studied in Monterey Bay, California. The number of crabs per plant between 9 PM and 3 AM is twice that between 5 AM and 7 PM. The nightly increase has two peaks, at 20% and 70% of the period of activity, with males making a greater contribution than females. Large males climb onto the higher reproductive portion, while females tend to remain on the lower vegetative portion. P. richii shows a preference for thicker growing C. osmundacea, but does not remain on a particular plant. While on the plant, P. richii eats C. osmundacea. The nocturnal habit of P. richii may have evolved as a (fish) predator avoidance mechanism.

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Document Type: Research Article

Publication date: 1982-01-01

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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