caa a22 4500 469095911 CHVBK 20180323133030.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF00317461 doi (NATIONALLICENCE)springer-10.1007/BF00317461 Malmquist H. Institute of Biology, University of Iceland, Grensásvegur 12, 108, Reykjavík, Iceland aut Phenotype-specific feeding behaviour of two arctic charr Salvelinus alpinus morphs [Elektronische Daten] [H. Malmquist] The feeding performance of two morphs of a trophically polymorphic fish, the arctic charr Salvelinus alpinus, feeding on zooplankton, was studied in the laboratory. Limnetic morphs, with a fusiform body, terminal mouth, short pectoral fins, and relatively long and dense gill rakers, fed at significantly higher rates on Daphnia and Cyclops than did benthic morphs. The benthic morphs were characterized by a chunky body form, subterminal mouth, long pectoral fins, and relatively short and spaced-out gill rakers. The limnetic morphs attacked the prey at significantly higher rates and were more successful in capture. Benthic morphs were more reluctant to start feeding on zooplankton and reaction time was longer than in limnetic morphs. In the absence as well as presence of zooplankton food, the position of the two morphs in the aquaria differed markedly. The results agree with dietary differences found in field-collected fish. The limnetic morphs consume zooplankton, whereas benthic morphs specialize on Lymnaea gastropods. The results suggest that benthic morphs are phenotypically inferior at using the pelagic food niche. This implies that the current role of competitive or predatory interactions in segregating the morphs may be minor. Springer-Verlag, 1992 Trophic specialization nationallicence Foraging behaviour nationallicence Morphological adaptation nationallicence Polymorphic arctic charr nationallicence Oecologia Springer-Verlag 92/3(1992-12-01), 354-361 0029-8549 92:3<354 1992 92 442 https://doi.org/10.1007/BF00317461 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317461 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Malmquist H. Institute of Biology, University of Iceland, Grensásvegur 12, 108, Reykjavík, Iceland aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 92/3(1992-12-01), 354-361 0029-8549 92:3<354 1992 92 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer