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Contrasting life history strategies of sympatric Arctic charr morphs, Salvelinus alpinus

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Abstract

In polymorphic populations morphs usually diverge in morphology, ecology and life history, which is most likely driven by adaptations to different environments or resources. Sympatric morphs may develop differences in several life history traits to be able to maximize fitness in alternative niches and habitats. Here, the contrasting life history traits of three sympatric Arctic charr (Salvelinus alpinus (L.)) morphs in a deep and oligotrophic lake in sub-arctic Norway are addressed. The charr morphs differ in spawning habitat and trophic niche. One is a littoral spawning morph that feeds on benthic invertebrates and zooplankton in the littoral and pelagic zones (referred to as the LO-morph), and two other are profundal spawning morphs that either utilize profundal soft bottom benthos as food resource (the PB-morph) or are piscivorous (the PP-morph). The LO-morph typically had intermediate life-history traits relative to the two profundal morphs that had highly contrasting life history traits, especially in growth and age and size of maturity. The PB-morph matured at a young age (∼3 years) and at a small body size (∼8.5 cm), thereby increasing their fitness by investing in reproduction early in life, which results in a short generation time and decreased probability of being predated before first reproduction. The PP-morph on the other hand, matured at an old age (∼9.2 years) and a large body size (∼26 cm), thereby increasing their fitness by investing in somatic growth to enhance initial fecundity, and also to reach a large body size profitable for piscivory. The different trade-off regime between the PP- and PB-morphs seems to be caused by adaptation to alternative trophic niches, and appears to be an important factor for the co-occurrence of the two sister-morphs in the profundal zone.

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  1. Department of Arctic and Marine Biology, University of Tromsø, Tromsø, N-9037, Norway

    A. Smalås, P. -A. Amundsen & R. Knudsen

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  1. A. Smalås
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Smalås, A., Amundsen, P.A. & Knudsen, R. Contrasting life history strategies of sympatric Arctic charr morphs, Salvelinus alpinus . J. Ichthyol. 53, 856–866 (2013). https://doi.org/10.1134/S0032945213100111

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