caa a22 4500 465792413 CHVBK 20180323112028.0 cr unu---uuuuu 170327e19900301xx s 000 0 eng 10.2307/1351428 doi (NATIONALLICENCE)springer-10.2307/1351428 Use of detrital foods and assimilation of nitrogen by coastal detritivores [Elektronische Daten] [Charlene D'Avanzo, Ivan Valiela] Two killifish common in east coast U.S.A. salt marshes,Cyprinodon variegatus Lacepede andFundulus heteroclitus Walbaum, differ in their ability to assimilate nitrogen from and grow on detritus.C. variegatus grew on a diet of detritus ofSpartina alterniflora Loisel, whileF. heteroclitus did not. In addition, when the fish were fed15N-labeledS. alterniflora detritus,15N:14N ratios inC. variegatus were higher than were ratios inF. heteroclitus. Therefore, even though both species ingest large amounts of detritus,C. variegatus makes more effective use of this portion of its diet. These dietary differences are corroborated by anatomical differences that suggest thatC. variegatus should make better use of detrital or plant tissues thanF. heteroclitus. In the label experiment, the degree of label in both fish was directly proportional to the degree of label in the food treatments. In previously published experiments designed to compare plant substrate with attached microbes as nitrogen sources for detritivores, %15N incorporated by a polychaete was also directly proportional to %15N in the detrital food. Therefore, it is difficult to distinguish between plant substrate and microbes as nitrogen sources for this detritivore. Estuarine Research Federation, 1990 D'Avanzo Charlene Hampshire College, 01002, Amherst, Massachusetts aut Valiela Ivan Marine Biological Laboratory Woods, Boston University Marine Program, 02543, Hole, Massachusetts aut Estuaries Springer-Verlag 13/1(1990-03-01), 20-24 0160-8347 13:1<20 1990 13 12237 https://doi.org/10.2307/1351428 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.2307/1351428 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- D'Avanzo Charlene Hampshire College, 01002, Amherst, Massachusetts aut NATIONALLICENCE 700 1- Valiela Ivan Marine Biological Laboratory Woods, Boston University Marine Program, 02543, Hole, Massachusetts aut NATIONALLICENCE 773 0- Estuaries Springer-Verlag 13/1(1990-03-01), 20-24 0160-8347 13:1<20 1990 13 12237 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer