{"refrec":{"BRefID":98938,"RR":"<b>Fenchel, T.; Kofoed, L.H.; Lappalainen, A.</b> (1975). Particle size-selection of two deposit feeders: the amphipod <i>Corophium volutator</i> and the prosobranch <i>Hydrobia ulva</i>. <i>Mar. Biol. (Berl.) 30(2)</i>: 119-128","BEntID":94209,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Mar. Biol. (Berl.) 30(2)</i>: 119-128","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Fenchel, T.; Kofoed, L.H.; Lappalainen, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Fenchel, T.; Kofoed, L.H.; Lappalainen, A.","Englishabstract":"The feeding biology of <i>C. volutator</i> is compared with that of the coexisting <i>H. ulvae</i>. Regarding ingestion of particles, both forms show size selection which alone can explain their coexistence. Particle size-selection also explains some qualitative differences in the composition of the food of the 2 forms; thus, diatoms play a relatively larger role in the diet of <i>H. ulvae</i> than in the diet of <i>C. volutator</i>, whereas bacteria are probably relatively more important for the latter. Results of experiments with feeding of C-14 labelled microorganisms are in accordance with the findings on particle size-distribution of the gut contents, and show that (1) <i>C. volutator</i> can only utilize bacteria adsorbed to particles within the size range 4 to 63 µm (this is why the presence of clay and silt particles on the sediment are necessary for efficient feeding of this amphipod); (2) <i>C. volutator</i> can utilize bacteria suspended in the water pumped through its burrow for respiration if silt and clay particles are present in the sediment. (3) <i>H. ulvae</i> can utilize large particles, and also browses on surfaces, and some evidence is brought forward that it also utilized mucus for trapping microorganisms. The coexistence of deposit-feeding animals is discussed. It is concluded that the number of coexisting, closely related spp is usually small, and that their resource partitioning is probably mainly based on particle-size selectivlty. In the case of unrelated forms e.g. <i>H. ulvae</i> and <i>C. volutator</i>. a number of behavioral, physiological and morphological differences, and also the widespread ability of deposit feeders to utilize alternative feeding mechanisms may also lead to resource partitioning. 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