caa a22 4500 469097965 CHVBK 20180323133036.0 cr unu---uuuuu 170328e19921001xx s 000 0 eng 10.1007/BF00650326 doi (NATIONALLICENCE)springer-10.1007/BF00650326 Brönmark Christer Department of Animal Ecology, Lund University, Helgonavägen 5, S-223 62, Lund, Sweden aut Leech predation on juvenile freshwater snails: effects of size, species and substrate [Elektronische Daten] [Christer Brönmark] Summary: The leechGlossiphonia complanata does not appear to have substantial impact on snail populations, but this may be due to most studies focusing on adult snails rather than juvenile snails. In this study I investigated how predation rates ofG. complanata feeding on newly-hatched and juvenile snails was affected by snail species, snail size, snail density and substrate, in a laboratory experiment. Number of snails eaten increased with increasing density resulting in a type II functional response curve. Predation rates were higher when leeches were feeding onLymnaea emarginata than onPhysa gyrina, whereas there was no significant difference in predation rates when they were feeding onL. emarginata andHelisoma anceps. Sandy substrates and greater snail size resulted in decreased predation rates. Sand reduced movement speed ofG. complanata, which probably reduced encounter rates. Thus, there was a comparatively large effect of leech predation on newly-hatched snails, due to a high probability of encounter and high predation rates, but spatial and temporal refuges probably reduce the importance of leech predation as a structuring force in freshwater snail assemblages. Springer-Verlag, 1992 Predation nationallicence Leech nationallicence Snail nationallicence Habitat complexity nationallicence Functional response nationallicence Oecologia Springer-Verlag 91/4(1992-10-01), 526-529 0029-8549 91:4<526 1992 91 442 https://doi.org/10.1007/BF00650326 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00650326 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Brönmark Christer Department of Animal Ecology, Lund University, Helgonavägen 5, S-223 62, Lund, Sweden aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 91/4(1992-10-01), 526-529 0029-8549 91:4<526 1992 91 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer