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Variation in neutral and polar lipid compositions of ova in ten reproductively isolated populations of walleye (Sander vitreus)

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We examined variation in the mass and composition of egg lipids within and among 10 walleye (Sander vitreus) populations. Larger eggs contained more lipid, but neither absolute lipid content (mg·egg–1) nor relative lipid content (percent of egg mass as lipid) were related to maternal age or size. Among populations, the proportion of egg mass as neutral lipid varied significantly, whereas the proportion as polar lipid did not. Egg fatty acid composition did vary with respect to maternal traits. In the Lake Ontario population, larger females appear to produce a qualitatively superior egg; relative abundances of docosahexaenoic acid (22:6(n–3), DHA) and arachidonic acid (20:4(n–6), AA) increased, and the relative abundance of eicosapentaenoic acid (20:5(n–3), EPA) decreased in egg fatty acids with increasing maternal length. We predicted that fatty acid profiles would be less variable in the polar than in the neutral lipid fraction. Relative abundances of DHA, AA, the sum of AA and EPA, and several other fatty acid classes were all significantly less variable in the polar than in the neutral fraction both among females and among populations. Our results indicate a high level of conservatism of egg lipid mass and polar lipid composition in this species.

Nous avons déterminé la variation de la masse et de la composition des lipides des oeufs du doré jaune (Sander vitreus) au sein de 10 populations, ainsi qu'entre les populations. Les oeufs les plus grands contiennent plus de lipides, mais ni le contenu absolu (mg/oeuf), ni le contenu relatif (pourcentage de la masse de l'oeuf représenté par les lipides) de lipides ne sont reliés à l'âge ou à la taille de la mère. D'une population à l'autre, le pourcentage de la masse des oeufs composé de lipides neutres varie de façon significative, mais non le pourcentage de lipides polaires. La composition en acides gras des oeufs varie avec les caractéristiques de la mère. Dans la population du lac Ontario, les femelles plus grandes semblent produire des oeufs de qualité supérieure: les abondances relatives des acides docosahexaénoïque (22:6(n–3), DHA) et arachidonique (20:4(n–6), AA) augmentent et l'abondance relative de l'acide eicopentaénoïque (20:5(n–3), EPA) diminue parmi les acides gras des oeufs en fonction de la longueur de la femelle. Nous avons prédit que les profils d'acides gras devraient être moins variables dans la fraction des lipides polaires que celle des lipides neutres. Les abondances relatives de DHA, d'AA, de la somme d'AA et d'EPA, ainsi que de plusieurs autres classes d'acides gras sont toutes significativement moins variables dans la fraction polaire que dans la fraction neutre, tant parmi les femelles qu'entre les populations. Nos résultats indiquent un fort degré de conservatisme de la masse lipidique des oeufs et de la composition en lipides polaires chez cette espèce.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2004-01-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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