Gregariousness and Systematic Affinity in Some North Carolinian Barnacles
Abstract:The settlement inducing capacity of arthropodin prepared from Balanus amphitrite amphitrite Darwin exhibited nearly its maximum effect on conspecific cyprids when applied to slates at high surface concentrations of 0.100–1.000g˙m–2, having at these levels only a small dependence on concentration. The initial rise in settlement above that of controls required several protein monolayers per unit geometric area of slate. These results agree with those of similar experiments on Semibalanus balanoides (L.). By using high surface concentrations on pitted slate surfaces, the cyprids of Balanus amphitrite were shown to choose to settle most frequently on surfaces that had been treated with the conspecific arthropodin. Next in order of settlement frequency were surfaces treated with arthropodin of nearly related species, viz. Balanus eburneus Gould, Balanus subalbidus Henry and Conopea galeatus (L.), while treatment with arthropodin from the more distantly related Chthamalus fragilis Darwin was the least effective, scarcely differing from controls. The advantages of responding to other species is probably that they mark places suitable for survival.
These results, confirm Knight-Jones' view that in barnacles with gregarious behavior the conspecific is preferred but proteins from other species can elicit a response dependent on their taxonomic affinity.
Document Type: Research Article
Publication date: September 1, 1990
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