. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2 B. R. JOHNSON AND J. ATEMA be perceived against seawater background concentrations of total dissolved amino acids in the high nanomolar range (Daumas, 1976; Mopper and Lindroth, 1982). Only a few studies of crustacean chemoreception have examined chemical feeding cues in pelagic crustaceans (Fuzessery and Childress, 1976; Poulet and Ouellet, 1982; Hamner and Hamner, 1977; Hamner et al., 1983) and none have seriously discussed chemical stimuli in relation to background concentration levels. A comparison of the chemical cues
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 2 B. R. JOHNSON AND J. ATEMA be perceived against seawater background concentrations of total dissolved amino acids in the high nanomolar range (Daumas, 1976; Mopper and Lindroth, 1982). Only a few studies of crustacean chemoreception have examined chemical feeding cues in pelagic crustaceans (Fuzessery and Childress, 1976; Poulet and Ouellet, 1982; Hamner and Hamner, 1977; Hamner et al., 1983) and none have seriously discussed chemical stimuli in relation to background concentration levels. A comparison of the chemical cues for feeding behaviors between crustaceans living on Sargassum and their littoral relatives may clarify the role that environmental constraints such as background noise levels play in determining the adequate stimuli for chemoreceptors. The purpose of this investigation was to provide an initial description of the chem- ical feeding cues of a dominant crustacean of the Sargassum community, the common gulf-weed shrimp, Leander tenuicornis (Fig. 1). This study is the first to investigate chemical feeding cues in this community. The results are discussed in terms of signal detection. MATERIALS AND METHODS Collection and maintenance of animals All experiments were carried out aboard the RV Oceanus (Cruise #165). Common gulf-weed shrimp were collected from Sargassum rafts dip-netted aboard ship at two locations off the mid-eastern coast of the United States (34°09'N, 76°03'W and 36°05'N, 74° 16W, approximately 50 miles east of Cape Lookout and Cape Hatteras respectively, along the western edge of the Gulf Stream). The animals were maintained in plastic bowls filled with ambient seawater changed 2-3 times daily. Ambient seawater (tem- perature range 12-23°C) was pumped into the shipboard lab through a clean garden hose from a seawater intake on the ship's bow. Two separate groups of animals were used in these experiments, one from each collection site. Fifteen animals were colle
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
