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Titolo:
Polymorphic segregation in Arctic charr Salvelinus alpinus (L.) from Vatnshlidarvatn, a shallow Icelandic lake
Autore:
Jonsson, B; Skulason, S;
Indirizzi:
Holar Coll, IS-551 Saudarkrokur, Iceland Holar Coll Saudarkrokur IcelandIS-551 oll, IS-551 Saudarkrokur, Iceland Oregon State Univ, Corvallis, OR 97331 USA Oregon State Univ Corvallis ORUSA 97331 te Univ, Corvallis, OR 97331 USA
Titolo Testata:
BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
fascicolo: 1, volume: 69, anno: 2000,
pagine: 55 - 74
SICI:
0024-4066(200001)69:1<55:PSIACS>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHARACTER DISPLACEMENT; ONCORHYNCHUS-NERKA; SOCKEYE-SALMON; GENETIC-BASIS; FISHES; DIFFERENTIATION; THINGVALLAVATN; POPULATIONS; STICKLEBACKS; DIVERGENCE;
Keywords:
morphology; competition; local adaptation; ecological specialization; polymorphism; speciation; ontogeny; phonotypic plasticity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Jonsson, B Holar Coll, IS-551 Saudarkrokur, Iceland Holar Coll Saudarkrokur Iceland IS-551 Saudarkrokur, Iceland
Citazione:
B. Jonsson e S. Skulason, "Polymorphic segregation in Arctic charr Salvelinus alpinus (L.) from Vatnshlidarvatn, a shallow Icelandic lake", BIOL J LINN, 69(1), 2000, pp. 55-74

Abstract

We studied the salmonid fish Arctic charr; Salvelinus alpinus, in a small and shallow landlocked lake in NW Iceland. The lake is productive but the only fish present is Arctic charr. Despite the apparent absence of discrete benthic and limnetic habitats for fish, two forms of Arctic charr are foundin the lake. They show subtle differences in morphology related to swimming performance and manoeuvrability, but differences in life history such as growth, and age and size at sexual maturation are more pronounced. Both forms have benthic feeding habits with One form consuming greater number of species than the other. We suggest that the segregation of these forms is based on the evolution of a specialist from a local generalist and that this has been made possible by the absence of a common fish competitor in similarlakes, the threespined stickleback Gesterosteous aculeatus. (C) 2000 The Linnean Society of London.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 15:02:53