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Day-night differences in the emergence of demersal zooplankton from a sand substrate in a kelp forest

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Abstract

Day-night differences in abundance and biomass of demersal zooplankton in the water column were determined by trapping these animals as they emerged from the sand substrate in a kelp forest (Macrocystis pyrifera) ecosystem off Santa Catalina Island, California, USA. The day and night sampling periods of the 24 June 1979 new moon each lasted 12 h. Abundance and biomass of total demersal zooplankton were significantly higher in night samples. A mean of 2,425±1,168 demersal zooplankton m-2 24 h-1 migrated over a diel cycle; 97% of these animals were crustaceans. The mean biomass of demersal zooplankton was 94.2±27.6 mg ash-free dry wt m-2 24 h-1. No significant differences were found in either the abundance or biomass of demersal zooplanktion collected in low and high traps, suggesting that most animals collected 25 cm off the bottom can sustain swimming to at least 75 cm and that both traps give comparable estimates of the amount of demersal zooplankton available to planktivorous predators.

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Communicated by N. D. Holland, La Jolla

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Hammer, R.M. Day-night differences in the emergence of demersal zooplankton from a sand substrate in a kelp forest. Mar. Biol. 62, 275–280 (1981). https://doi.org/10.1007/BF00397694

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