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Differential energy allocation of alternative male tactics in masu salmon (Oncorhynchus masou)

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Abstract:



To compare energy allocation to gonad, relative to soma, between alternative male tactics (mature parr and migratory males) in masu salmon (Oncorhynchus masou), we quantified energy contents in somatic and testicular tissues for the two tactics from two lake-run populations (Shikaribetsu Lake and Shumarinai Reservoir) in Hokkaido, northern Japan. Mass-specific testicular energy (kJ·g–1) was lower in migratory males than in mature parr in the Shikaribetsu population, but not in the Shumarinai population. The consistent pattern was observed in somatic energy, suggesting that mass-specific energy reflects population environment rather than inherent allocation pattern. Despite this confounding effect of specific energy, total testicular energy (kJ), relative to total somatic energy, was higher in mature parr in both populations. We suggest that strong sperm competition involved with sneak spawning is responsible for an increased testicular investment in mature parr.

Dans le but de comparer l'allocation de l'énergie aux gonades, relativement au soma, chez des mâles à stratégies reproductives différentes (tacons arrivés à maturité et mâles migrateurs) du saumon masou (Oncorhynchus masou), nous avons mesuré les contenus énergétiques des tissus somatiques et testiculaires chez des mâles des deux groupes dans des populations à reproduction lacustre (lac Shikaribetsu et réservoir Shumarinai) en Hokkaido, dans le nord du Japon. L'énergie spécifique à la masse (kJ·g–1) des testicules est plus élevée chez les mâles migrateurs que chez les tacons dans la population de Shikaribetsu, mais pas dans celle de Shumarinai. La même tendance s'observe dans l'énergie somatique, ce qui laisse croire que l'énergie spécifique à la masse reflète l'environnement plutôt qu'un pattern inhérent d'allocation. Malgré l'effet masquant de l'énergie spécifique, relativement à l'énergie somatique totale, l'énergie testiculaire totale (kJ), est plus élevée chez les tacons des deux populations. Nous croyons qu'une forte compétition spermatique combinée à une reproduction furtive est responsable de l'investissement énergétique testiculaire plus grand chez les tacons.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2002

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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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