Details

Autor(en) / Beteiligte

• L'Abée‐Lund, Jan Henning
• Vøllestad, L. Asbjørn
• Lobón‐Cerviá, Javier
• Sanz, Nuria

Titel

Life‐history Plasticity in Anadromous Brown Trout

Ist Teil von

• Brown Trout, 2017, p.251-265

Ort / Verlag

Chichester, UK: John Wiley & Sons, Ltd

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Wiley Online Library All Obooks

Beschreibungen/Notizen

• The wide geographical distribution of brown trout Salmo trutta demonstrates a species with considerable plasticity as well as adaptability in various life history traits. Plasticity is the ability to respond phenotypically to abiotic and biotic factors. The Norwegian rivers running into salt water situated at 58–71 °N, 5–30 °E vary significantly in physical conditions – such as discharge, water temperature and length of passable river reaches. These conditions give rise to a large matrix of physical conditions for the anadromous brown trout inhabiting and using these rivers as spawning and rearing habitats. We address some important life history traits and show how these vary at a latitudinal and elevation scale. Age at smolting, sea age at sexual maturity and longevity demonstrate a significant positive latitudinal cline. Considerable variation in life history traits also occurs within river systems. Sea age and length at sexual maturity increases whereas fecundity decreases with increasing length of river migration. Time of smolt descent appears later in spring in northern than southern rivers, as well as the descent is becoming earlier in later years. The plasticity may make anadromous brown trout robust to climate changes.