caa a22 4500 469098058 CHVBK 20180323133037.0 cr unu---uuuuu 170328e19920801xx s 000 0 eng 10.1007/BF00317788 doi (NATIONALLICENCE)springer-10.1007/BF00317788 The influence of pH on concentrations of protein and phenolics and resource quality of decomposing floating leaf material of Nymphaea alba L. (Nymphaeaceae) for the detritivore Asellus aquaticus (L.) [Elektronische Daten] [C. Kok, C. Hof, J. Lenssen, G. van der Velde] Summary: Senescent floating leaf material of Nymphaea alba L., collected in an acidified moorland pool, was used in decomposition studies in two aquatic systems that differed greatly in pH, alkalinity and nutrient concentration. Concentrations of extractable protein and phenolics in the decomposing leaf material were measured during the incubation period. Protein levels were not significantly different in the leaf material from the two study sites, whereas the concentrations of phenolics in the degrading leaf blades from the acid site remained higher than in the material from the alkaline site. The resource quality of the decomposing leaf material was estimated by feeding tests using Asellus aquaticus (L.) in the laboratory. The effect of an artificially increased level of tannin on the feeding activity of A. aquaticus was also studied. Material from the acid system was consumed at a lower rate than material from the other system. The phenolic content of the material was found to be the most important feeding cue. The protein level of the leaf blade detritus seems to be of less importance. The structure of the decomposing leaf blades may have influenced the resource quality in the later stages of the experiment. Springer-Verlag, 1992 Decomposition nationallicence Feeding cues nationallicence Protein nationallicence Phenolics nationallicence Acidification nationallicence Kok C. Laboratory of Aquatic Ecology, Catholic University, Toernooiveld, 6525 ED, Nijmegen, The Netherlands aut Hof C. Laboratory of Aquatic Ecology, Catholic University, Toernooiveld, 6525 ED, Nijmegen, The Netherlands aut Lenssen J. Laboratory of Aquatic Ecology, Catholic University, Toernooiveld, 6525 ED, Nijmegen, The Netherlands aut van der Velde G. Laboratory of Aquatic Ecology, Catholic University, Toernooiveld, 6525 ED, Nijmegen, The Netherlands aut Oecologia Springer-Verlag 91/2(1992-08-01), 229-234 0029-8549 91:2<229 1992 91 442 https://doi.org/10.1007/BF00317788 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317788 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kok C. Laboratory of Aquatic Ecology, Catholic University, Toernooiveld, 6525 ED, Nijmegen, The Netherlands aut NATIONALLICENCE 700 1- Hof C. Laboratory of Aquatic Ecology, Catholic University, Toernooiveld, 6525 ED, Nijmegen, The Netherlands aut NATIONALLICENCE 700 1- Lenssen J. Laboratory of Aquatic Ecology, Catholic University, Toernooiveld, 6525 ED, Nijmegen, The Netherlands aut NATIONALLICENCE 700 1- van der Velde G. Laboratory of Aquatic Ecology, Catholic University, Toernooiveld, 6525 ED, Nijmegen, The Netherlands aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 91/2(1992-08-01), 229-234 0029-8549 91:2<229 1992 91 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer