caa a22 4500 47711539X CHVBK 20180405111621.0 cr unu---uuuuu 170330e19960501xx s 000 0 eng 10.1007/BF00001690 doi (NATIONALLICENCE)springer-10.1007/BF00001690 Anderson Roy Department of Zoology, College of Biological Science, University of Guelph, N1G 2W1, Guelph, Ontario, Canada aut Why do fish have so few roundworm (nematode) parasites? [Elektronische Daten] [Roy Anderson] Synopsis: Although they are the oldest and most diverse members of the subphylum, the fishes have relatively few nematode parasites in comparison with other vertebrate classes. It is hypothesized that this paucity of parasite species has occurred because nematode parasites first evolved in terrestrial hosts and only a few lines of these parasites were able to transfer to fish after the appearance of heteroxeny (use of intermediate hosts) and paratenesis (use of transport hosts). The inability of nematodes to initiate parasitism in aquatic ecosystems restricted fish parasites mainly to forms first adapted to terrestrial vertebrates and at the same time deprived large groups of aquatic invertebrates such as the crustaceans, annelids and molluscs of a nematode parasite fauna. Kluwer Academic Publishers, 1996 Hosts nationallicence Origins nationallicence Evolution nationallicence Aquatic ecosystems nationallicence Heteroxeny nationallicence Paratenesis nationallicence Environmental Biology of Fishes Kluwer Academic Publishers 46/1(1996-05-01), 1-5 0378-1909 46:1<1 1996 46 10641 https://doi.org/10.1007/BF00001690 text/html Onlinezugriff via DOI 1 editorial jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00001690 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Anderson Roy Department of Zoology, College of Biological Science, University of Guelph, N1G 2W1, Guelph, Ontario, Canada aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers 46/1(1996-05-01), 1-5 0378-1909 46:1<1 1996 46 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer