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Alternative mating tactics of arctic charr, Salvelinus alpinus, in Thingvallavatn, Iceland

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Synopsis

During the spawning season the operational sex ratio of the large benthivorous (LB) arctic charr morph in Thingvallavatn is skewed in favour of males which compete intensely on the spawning site. The skewness is caused by males staying longer on the spawning ground than females. LB males employ two mating tactics. Either they guard the female or they attempt sneak-matings with guarded females. The tactics seem to obey a pure conditional strategy where relative size is the important criterion. Generally, the larger males use the guarding tactic and the smaller the sneaking tactic. Assessment of size is a part of the strategy. Relative size influences male behaviour irrespective of which tactic they employ. Guarding is more successful when courting is considered, both with respect to relative frequency and duration of courting acts. Females are aggressive towards the sneakers especially when they are small. This could be interpreted as female choice in favour of large males, but also as a defence against egg predation. A small dwarflike benthivorous morph (SB) is found in the same area. It is mainly active during night and on rare occasions SB-males are seen sneaking into the nest of LB-females. In such cases they are attacked vigorously by both LB sexes.

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Authors and Affiliations

  1. The Icelandic Institute for Teacher Education, Stakkahlid, Reykjavík, Iceland

    Hrefna Sigurjónsdóttir

  2. Marine Research Institute, Skúlagata 4, Reykjavík, Iceland

    Karl Gunnarsson

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  1. Hrefna Sigurjónsdóttir
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  2. Karl Gunnarsson
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Sigurjónsdóttir, H., Gunnarsson, K. Alternative mating tactics of arctic charr, Salvelinus alpinus, in Thingvallavatn, Iceland. Environ Biol Fish 26, 159–176 (1989). https://doi.org/10.1007/BF00004814

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