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Contrasting levels of sympatric divergence within lacustrine Arctic charr Salvelinus alpinus forms flock: high differentiation between size forms, low differentiation between seasonal races.

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Title: Contrasting levels of sympatric divergence within lacustrine Arctic charr Salvelinus alpinus forms flock: high differentiation between size forms, low differentiation between seasonal races.
Authors: Tambovtseva, Valentina G.1 (AUTHOR) lynx1994@gmail.com, Samusenok, Vitalii P.2 (AUTHOR), Yur'ev, Anatolii L.2 (AUTHOR), Korostelev, Nikolai B.3 (AUTHOR), Khlystov, Viktor S.2 (AUTHOR), Matveev, Arkadii N.2 (AUTHOR), Alekseyev, Sergey S.1 (AUTHOR) alekseyev@mail.ru
Source: Hydrobiologia. Aug2025, Vol. 852 Issue 14, p3523-3540. 18p.
Subjects: Arctic char, Sympatric speciation, Microsatellite repeats, Life sciences, Gene flow, Reproductive isolation, Spawning
Geographic Terms: Transbaikalia (Russia)
Abstract: The formation of reproductive isolation barriers is fundamental to sympatric speciation. In teleost fishes, an important mechanism for the reduction of gene flow between emerging species and intraspecific forms is the divergence in reproductive strategies, in particular in spawning time. Large time difference between spawning periods of sympatric forms typically provides strong pre-zygotic isolation and rapid genetic and morphological divergence between them. However, our results indicate that it may not always be the case. We investigated genetic divergence between recently discovered autumn-spawning and spring-spawning subpopulations of the small planktivorous Arctic charr form in one of the Transbaikalian lakes using 14 microsatellite loci and found that it was very low (Fst = 0.0028) as compared with their differentiation from a sympatric large piscivorous form (Fst = 0.284–0.301). Charr of these subpopulations manifested subtle differences in morphology and life history and had similar diets. We consider that low genetic, phenotypic and ecological differentiation between autumn and spring spawners of the small form is the result of their incomplete reproductive isolation due to the transformation between them (change of spawning time) in successive generations. [ABSTRACT FROM AUTHOR]
Copyright of Hydrobiologia is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Contrasting levels of sympatric divergence within lacustrine Arctic charr Salvelinus alpinus forms flock: high differentiation between size forms, low differentiation between seasonal races.
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  Data: <searchLink fieldCode="AR" term="%22Tambovtseva%2C+Valentina+G%2E%22">Tambovtseva, Valentina G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> lynx1994@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Samusenok%2C+Vitalii+P%2E%22">Samusenok, Vitalii P.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yur'ev%2C+Anatolii+L%2E%22">Yur'ev, Anatolii L.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Korostelev%2C+Nikolai+B%2E%22">Korostelev, Nikolai B.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Khlystov%2C+Viktor+S%2E%22">Khlystov, Viktor S.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Matveev%2C+Arkadii+N%2E%22">Matveev, Arkadii N.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alekseyev%2C+Sergey+S%2E%22">Alekseyev, Sergey S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> alekseyev@mail.ru</i>
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  Data: <searchLink fieldCode="JN" term="%22Hydrobiologia%22">Hydrobiologia</searchLink>. Aug2025, Vol. 852 Issue 14, p3523-3540. 18p.
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  Data: <searchLink fieldCode="DE" term="%22Arctic+char%22">Arctic char</searchLink><br /><searchLink fieldCode="DE" term="%22Sympatric+speciation%22">Sympatric speciation</searchLink><br /><searchLink fieldCode="DE" term="%22Microsatellite+repeats%22">Microsatellite repeats</searchLink><br /><searchLink fieldCode="DE" term="%22Life+sciences%22">Life sciences</searchLink><br /><searchLink fieldCode="DE" term="%22Gene+flow%22">Gene flow</searchLink><br /><searchLink fieldCode="DE" term="%22Reproductive+isolation%22">Reproductive isolation</searchLink><br /><searchLink fieldCode="DE" term="%22Spawning%22">Spawning</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Transbaikalia+%28Russia%29%22">Transbaikalia (Russia)</searchLink>
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  Data: The formation of reproductive isolation barriers is fundamental to sympatric speciation. In teleost fishes, an important mechanism for the reduction of gene flow between emerging species and intraspecific forms is the divergence in reproductive strategies, in particular in spawning time. Large time difference between spawning periods of sympatric forms typically provides strong pre-zygotic isolation and rapid genetic and morphological divergence between them. However, our results indicate that it may not always be the case. We investigated genetic divergence between recently discovered autumn-spawning and spring-spawning subpopulations of the small planktivorous Arctic charr form in one of the Transbaikalian lakes using 14 microsatellite loci and found that it was very low (Fst = 0.0028) as compared with their differentiation from a sympatric large piscivorous form (Fst = 0.284–0.301). Charr of these subpopulations manifested subtle differences in morphology and life history and had similar diets. We consider that low genetic, phenotypic and ecological differentiation between autumn and spring spawners of the small form is the result of their incomplete reproductive isolation due to the transformation between them (change of spawning time) in successive generations. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Hydrobiologia is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        StartPage: 3523
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      – SubjectFull: Arctic char
        Type: general
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      – SubjectFull: Microsatellite repeats
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      – SubjectFull: Gene flow
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