setae within caprellid amphipods

setae within caprellid amphipods - Reference : Biol. Bull.,...

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(April, 1979) FUNCTIONS OF SWIMMING SETAE WITHIN CAPRELLID AMPHIPODS (CRUSTACEA) EDSEL A. CAINE' Friday Harbor Laboratories, University of Washington, Friday Harbor, Washington 98250 The term â€oe¿swimmingsetae― has been given to paired, long, plumose setae arising in a â€oe¿V― pattern from the ventral surface of the antennae of caprellid amphipods (Figs. 1, 2). Swimming setae are located on the two distal peduncular articles of the antennae and may occur on the proximal flagellar article ( Mayer, 1882, 1890, 1903 ; McCain, 1968 ; Laubitz, 1970, 1972) . Presence or absence of swimming setae on the flagellum is characteristic for a species. Two functions have been attributed to swimming setae : locomotion (see Wet zel, 1932) and particle capture during filter-feeding (Caine, 1974, 1977). Without quantification Wetzel (1932) considered feeding to be the prinuary function of swimniing setae. No recent analysis has been directed toward locomotory mecha nisnis of caprellids. However, Keith (1971) indicated directional swimming by two species of Caprella. Caine (1977) nieasured particle capture by caprellids but assumed that presence of swiniming setae indicated an equal reliance upon filter-feeding in food acquisition. Subsequent attempts to rear caprellids with swimming setae showed that some species survived only when periphyton was present. Survival of some other species was independent of periphyton presence. Only four genera of caprellids have swimming setae (Caprella, Heterocaprella, Metacaprella, and Triteila), but 127 of the 241 described species of the suborder Caprellidea (excluding the whale lice, Cyamidae) belong to these genera. Caprella alone has 119 described species, and it is the only genus in the Caprellidea with niore than 9 described species. It is possible that swimming setae had some impact on the species proliferation of Caprella. This study was undertaken to quantify the inuportance of swimming setae to swimming ability and to critically exaniine filter morphology. MATERIALS AND METHODS Swimming rates were measured in the laboratory. Speciniens in a running seawater aquaria were released 10 cm from an Obelia dichotoina (L.) colony (a naturally occurring substratum) and time from the onset of swimming until the substratum was reached was recorded. Species with swimming setae were Caprella laeviztscula Mayer, Caprella natalensis Mayer, Caprella striata Mayer, Metacaprella kennerlyl (Stimpson), and Triteila pilinzana Mayer; species without swimming setae were Deutella californica Mayer and Paracaprella tenuis Mayer. P. tenuis is an Atlantic species and was tested with Bugula avicularia (L.) as a substratum. Speciniens were released horizontal to the substratuni sanuple and 1 Current address: Department of Biology, Fairleigh Dickinson University, Madison, New Jersey07940. 169
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setae within caprellid amphipods - Reference : Biol. Bull.,...

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