Divergent skull morphology between trophic separated lacustrine forms of Dolly Varden charr from Lake Kronotskoe

Saltykova, E.A.; Markevich, G.N.; Kuzishchin, K.V.

Авторы: Saltykova E.A., Markevich G.N., Kuzishchin K.V.
Журнал: Environmental Biology of Fishes
Том: 98
Номер: 2
Год издания: 2015
Издательство: Springer Nature
Местоположение издательства: Switzerland
Первая страница: 559
Последняя страница: 570
DOI: 10.1007/s10641-014-0287-y
Аннотация: Trophic morphology divergence between two forms of Dolly Varden Salvelinus malma from Lake Kronotskoe (Kamchatka Peninsula, Russia): Salvelinus albus (omnivorous form) and Salvelinus schmidti (benthivorous form) was studied using the skull bone’s qualitative and measurable attributes. The strongest morphological differences between these two charr forms were associated with the jaw bone structures (i.e. premaxilla, maxilla, angulo-articular and dentary bones). There was an abrupt shift in bone structures with increasing body length in both morphs. S. albus of body length less than 350 mm had wider dentary, maxilla and angulo-articular bones than individuals of similar sized S. schmidti. In contrast, large (>350 mm) individuals of S. albus had narrower bone structures than individuals of S. schmidti. This divergent pattern of the bone structures in the jaws is closely linked with their different trophic niches measured by the contence of stable isotope (δ13C, δ15N) values in the tissues. S. albus have a narrow, long jaw bones and a terminal mouth and occupy an omnivorous niche with clear ontogenetic nicheshifts (i.e. benthivore and piscivore) by increasing in size. In contrast, S. schmidti have short jaw bones and a low mouth; also S. schmidti is exclusively benthivores through their entire ontogeny. These trophic traits
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Divergent skull morphology between trophic separated lacustrine forms of Dolly Varden charr from Lake Kronotskoeстатья

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