Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char?
Theoretical models predict that subordinate males should have higher sperm velocity to compensate for their disadvantaged mating role and because they experience sperm competition more frequently than dominant males. Differences in mean velocity between sperm of dominants and subordinates in the pre...
Published in: | Canadian Journal of Zoology |
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Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2006
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Subjects: | |
Online Access: | https://hdl.handle.net/10037/4789 https://doi.org/10.1139/z06-097 |
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ftunivtroemsoe:oai:munin.uit.no:10037/4789 |
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openpolar |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Etologi: 485 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 |
spellingShingle |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Etologi: 485 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 Vaz Serrano, Jonathan Folstad, Ivar Rudolfsen, Geir Figenschou, Lars Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char? |
topic_facet |
VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Etologi: 485 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 |
description |
Theoretical models predict that subordinate males should have higher sperm velocity to compensate for their disadvantaged mating role and because they experience sperm competition more frequently than dominant males. Differences in mean velocity between sperm of dominants and subordinates in the predicted direction are also documented for a few species, including the Arctic char, Salvelinus alpinus (L., 1758). Yet, this difference in mean velocity does not imply that the fastest sperm within an ejaculate, which are those most likely to fertilize eggs, swim faster in subordinates than in dominants. We studied the 5% and 10% fastest sperm cells in ejaculates of dominant and subordinate Arctic char. Before individuals attained their status, there were no differences in velocity between the fastest sperm of males that later became dominant or subordinate. Yet, after establishment of social position, subordinates showed significantly higher sperm swimming speed of the fastest cells in the first 30s post activation (i.e., at 15, 20, and 30s post activation). Males that became subordinates showed no change in sperm speed of the fast cells compared with those at pre-trial levels, whereas males that became dominant reduced the speed of their sperm (15s post activation) compared with those at pre-trial levels. Our results suggest that males which attain social dominance are unable to maintain high sperm velocity, even among the small fraction of the fastest cells. D'après les modèles théoriques, les mâles subordonnés doivent posséder des spermatozoïdes plus rapides pour compenser leur position désavantageuse dans la reproduction; ils subissent aussi la compétition spermatique plus souvent que les mâles dominants. Il existe des données qui montrent des différences de vitesse moyenne dans le sens prévu entre le sperme de dominants et de subordonnés chez quelques espèces, dont l'omble chevalier, Salvelinus alpinus (L., 1758). Néanmoins, cette différence de vitesse moyenne ne veut pas dire que les spermatozoïdes les plus rapides dans un éjaculat, qui sont ceux qui sont les plus susceptibles de féconder les oeufs, nagent plus vite chez les subordonnés que chez les dominants. Nous avons étudié les spermatozoïdes les plus rapides, soit les 5% et les 10% supérieurs, dans des éjaculats d'ombles chevaliers dominants et subordonnés. Avant que les individus n'aient atteint leur statut social, il n'y a pas de différence de vitesse entre les spermatozoïdes les plus rapides des mâles qui vont plus tard devenir dominants ou subordonnés. Cependant, une fois la position sociale établie, les spermatozoïdes les plus rapides des subordonnés ont des vitesses de nage significativement plus rapides durant les 30 premières secondes après l'activation (i.e., 15, 20 et 30 s après l'activation). Les mâles qui deviennent subordonnés ne subissent pas de changement de vitesse de leurs spermatozoïdes rapides par rapport aux vitesses enregistrées avant les essais, alors que les mâles devenus dominants réduisent la vitesse de leurs spermatozoïdes (15 s après l'activation) par comparaison aux vitesses d'avant les essais. Nos résultats indiquent que les mâles qui atteignent la dominance sociale n'arrivent pas à maintenir une vitesse élevée de leurs spermatozoïdes, même pour une petite fraction de leurs cellules les plus rapides. |
format |
Article in Journal/Newspaper |
author |
Vaz Serrano, Jonathan Folstad, Ivar Rudolfsen, Geir Figenschou, Lars |
author_facet |
Vaz Serrano, Jonathan Folstad, Ivar Rudolfsen, Geir Figenschou, Lars |
author_sort |
Vaz Serrano, Jonathan |
title |
Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char? |
title_short |
Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char? |
title_full |
Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char? |
title_fullStr |
Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char? |
title_full_unstemmed |
Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char? |
title_sort |
do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of arctic char? |
publishDate |
2006 |
url |
https://hdl.handle.net/10037/4789 https://doi.org/10.1139/z06-097 |
long_lat |
ENVELOPE(-57.831,-57.831,51.500,51.500) |
geographic |
Arctic Chevalier |
geographic_facet |
Arctic Chevalier |
genre |
Arctic Salvelinus alpinus |
genre_facet |
Arctic Salvelinus alpinus |
op_relation |
Canadian Journal of Zoology (2006), 84(7):1019-1024 FRIDAID 377090 http://dx.doi.org/10.1139/z06-097 0008-4301 https://hdl.handle.net/10037/4789 URN:NBN:no-uit_munin_4503 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1139/z06-097 |
container_title |
Canadian Journal of Zoology |
container_volume |
84 |
container_issue |
7 |
container_start_page |
1019 |
op_container_end_page |
1024 |
_version_ |
1766335779124019200 |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/4789 2023-05-15T15:03:56+02:00 Do the fastest sperm within an ejaculate swim faster in subordinate than in dominant males of Arctic char? Vaz Serrano, Jonathan Folstad, Ivar Rudolfsen, Geir Figenschou, Lars 2006 https://hdl.handle.net/10037/4789 https://doi.org/10.1139/z06-097 eng eng Canadian Journal of Zoology (2006), 84(7):1019-1024 FRIDAID 377090 http://dx.doi.org/10.1139/z06-097 0008-4301 https://hdl.handle.net/10037/4789 URN:NBN:no-uit_munin_4503 openAccess VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ethology: 485 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Etologi: 485 VDP::Mathematics and natural science: 400::Zoology and botany: 480::Ecology: 488 VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Økologi: 488 Journal article Tidsskriftartikkel Peer reviewed 2006 ftunivtroemsoe https://doi.org/10.1139/z06-097 2021-06-25T17:53:28Z Theoretical models predict that subordinate males should have higher sperm velocity to compensate for their disadvantaged mating role and because they experience sperm competition more frequently than dominant males. Differences in mean velocity between sperm of dominants and subordinates in the predicted direction are also documented for a few species, including the Arctic char, Salvelinus alpinus (L., 1758). Yet, this difference in mean velocity does not imply that the fastest sperm within an ejaculate, which are those most likely to fertilize eggs, swim faster in subordinates than in dominants. We studied the 5% and 10% fastest sperm cells in ejaculates of dominant and subordinate Arctic char. Before individuals attained their status, there were no differences in velocity between the fastest sperm of males that later became dominant or subordinate. Yet, after establishment of social position, subordinates showed significantly higher sperm swimming speed of the fastest cells in the first 30s post activation (i.e., at 15, 20, and 30s post activation). Males that became subordinates showed no change in sperm speed of the fast cells compared with those at pre-trial levels, whereas males that became dominant reduced the speed of their sperm (15s post activation) compared with those at pre-trial levels. Our results suggest that males which attain social dominance are unable to maintain high sperm velocity, even among the small fraction of the fastest cells. D'après les modèles théoriques, les mâles subordonnés doivent posséder des spermatozoïdes plus rapides pour compenser leur position désavantageuse dans la reproduction; ils subissent aussi la compétition spermatique plus souvent que les mâles dominants. Il existe des données qui montrent des différences de vitesse moyenne dans le sens prévu entre le sperme de dominants et de subordonnés chez quelques espèces, dont l'omble chevalier, Salvelinus alpinus (L., 1758). Néanmoins, cette différence de vitesse moyenne ne veut pas dire que les spermatozoïdes les plus rapides dans un éjaculat, qui sont ceux qui sont les plus susceptibles de féconder les oeufs, nagent plus vite chez les subordonnés que chez les dominants. Nous avons étudié les spermatozoïdes les plus rapides, soit les 5% et les 10% supérieurs, dans des éjaculats d'ombles chevaliers dominants et subordonnés. Avant que les individus n'aient atteint leur statut social, il n'y a pas de différence de vitesse entre les spermatozoïdes les plus rapides des mâles qui vont plus tard devenir dominants ou subordonnés. Cependant, une fois la position sociale établie, les spermatozoïdes les plus rapides des subordonnés ont des vitesses de nage significativement plus rapides durant les 30 premières secondes après l'activation (i.e., 15, 20 et 30 s après l'activation). Les mâles qui deviennent subordonnés ne subissent pas de changement de vitesse de leurs spermatozoïdes rapides par rapport aux vitesses enregistrées avant les essais, alors que les mâles devenus dominants réduisent la vitesse de leurs spermatozoïdes (15 s après l'activation) par comparaison aux vitesses d'avant les essais. Nos résultats indiquent que les mâles qui atteignent la dominance sociale n'arrivent pas à maintenir une vitesse élevée de leurs spermatozoïdes, même pour une petite fraction de leurs cellules les plus rapides. Article in Journal/Newspaper Arctic Salvelinus alpinus University of Tromsø: Munin Open Research Archive Arctic Chevalier ENVELOPE(-57.831,-57.831,51.500,51.500) Canadian Journal of Zoology 84 7 1019 1024 |