On brook chars of the southern Kuril Islands and a possible mechanism of formation of dwarf forms of Dolly Varden trout Salvelinus malma curilus

Pichugin, M. Yu.; Sidorov, L. K.; Gritsenko, O. F.

doi:10.1134/s0032945206020044

Cited by 8 publications

(2 citation statements)

References 4 publications

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“…Apparently, a higher maternal T 3 content known to have a strong impact on the subsequent developmental time‐scale (Mousseau & Fox, 1998; Ruuskanen & Hsu, 2018) led to the accelerated embryogenesis, precocious life stage transition and increased somatic growth in SC relative to DV. These developmental alterations result in the reduction of SC vertebrae count and size of otolith primordia (Melnik et al., 2020), the well‐known outcome of accelerated development in fishes (Esin, 2015; Hubbs, 1922; McDowall, 2008; Pichugin et al., 2006).…”

Section: Discussionmentioning

confidence: 99%

Natural toxic impact and thyroid signalling interplay orchestrates riverine adaptive divergence of salmonid fish

Есин

Маркевич

Melnik

et al. 2021

Journal of Animal Ecology

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Adaptive radiation in fishes has been actively investigated over the last decades. Along with numerous well‐studied cases of lacustrine radiation, some examples of riverine sympatric divergence have been recently discovered. In contrast to the lakes, the riverine conditions do not provide evident stability in the ecological gradients. Consequently, external factors triggering the radiation, as well as developmental mechanisms underpinning it, remain unclear. Herein, we present the comprehensive study of external and internal drivers of the riverine adaptive divergence of the salmonid fish Salvelinus malma. In the Kamchatka River, north‐east Asia, this species splits in the reproductively isolated morphs that drastically differ in ecology and morphology: the benthivorous Dolly Varden (DV) and the piscivorous stone charr (SC). To understand why and how these morphs originated, we performed a series of field and experimental work, including common‐garden rearing, comparative ontogenetic, physiological and endocrinological analyses, hormonal ‘engineering’ of phenotypes and acute toxicological tests. We revealed that the type of spawning ground acts as the decisive factor driving the radiation of S. malma. In contrast to DV spawning in the leaf krummholz zone, SC reproduces in the zone of coniferous forest, which litter has a toxic impact on developing fishes. SC enhances resistance to the toxicants via metabolism acceleration provided by the elevated thyroid hormone expenditure. These physiological changes lead to the multiple heterochronies resulting in a specific morphology and ecology of SC. Salvelinus malma represents a notable example of how the thyroid axis contributes to the generation of diverse phenotypic outcomes underlying the riverine sympatric divergence. Our findings, along with the paleoecology data concerning spruce forest distribution during the Pleistocene, provide an opportunity to reconstruct a scenario of S. malma divergence. Taken together, obtained results with the data of the role of thyroid hormones in the ontogeny and diversification of fishes contribute a resource to consider the thyroid axis as a prime director orchestrating the phenotypic plasticity promoting evolutionary diversification under the changing environmental conditions.

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Section: Discussionmentioning

confidence: 99%

Natural toxic impact and thyroid signalling interplay orchestrates riverine adaptive divergence of salmonid fish

Есин

Маркевич

Melnik

et al. 2021

Journal of Animal Ecology

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show abstract

“…Наличие стабильных оседлых групп в составе эндемичных форм гольцов бассейна оз. Кроноцкое также опровергает высказанное ранее предположение о том, что самки мальмоидных гольцов способны созревать в реках только за счет откорма икрой тихоокеанских лососей (Pich�gin et al, 2006). В зоне обитания оседлых групп кроноцких гольцов нерестилища озерной нерки-кокани отсутствуют.…”

Section: заключениеunclassified

The riverine dwelling groups of endemic Dolly Varden (Salvelinus malma, Salmonidae) morphs from lake Kronotskoe (Kamchatka, Russia)

Маркевич¹,

Есин²

2018

Nat. Conserv. Res.

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Rapid miniaturization of Salvelinus fish as an adaptation to the volcanic impact

2020

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On brook chars of the southern Kuril Islands and a possible mechanism of formation of dwarf forms of Dolly Varden trout Salvelinus malma curilus

Cited by 8 publications

References 4 publications

Natural toxic impact and thyroid signalling interplay orchestrates riverine adaptive divergence of salmonid fish

Natural toxic impact and thyroid signalling interplay orchestrates riverine adaptive divergence of salmonid fish

The riverine dwelling groups of endemic Dolly Varden (Salvelinus malma, Salmonidae) morphs from lake Kronotskoe (Kamchatka, Russia)

Rapid miniaturization of Salvelinus fish as an adaptation to the volcanic impact

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