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Generally, breeding behaviour of infaunal amphipods like P. altamarinus is influenced by location. In deeper waters the spring rise in temperature initiates breeding, while in shallower waters it is induced by tidal phasing (Fincham, 1971). Oedicerotids, the amphipod family to which P. altamarinus belongs, burrow through the surface layer of the sediment while feeding. They only use the mouth parts and the gnathopods for collecting food. Aquarium investigations have shown that they ingest loose detritus sifted from the mud and water interface or gathered by the maxillipeds from the material passed to them by the gnathopods (Enequist, 1949). Apparently, P. altamarinus can switch foods at different times of the year: harpacticoids in summer and diatoms and other algae scraped from sand grains in winter (Beare & Moore, 1994).


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Source: World Register of Marine Species

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