14 research outputs found

    The fate of received sperm in the reproductive tract of a hermaphroditic snail and its implications for fertilisation.

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    Multiple mating, sperm storage and internal fertilisation enhance sperm competition. The great pond snail can use stored sperm for over three months, and frequently mates with different partners. This hermaphrodite, Lymnaea stagnalis, can also self-fertilise and often produces egg masses containing both selfed and outcrossed eggs. Hence, a sperm recipient may exert considerable control over paternity. Using microsatellite markers, we show that when allosperm are present, all genotyped eggs are cross-fertilised. We also find that sperm have the opportunity to compete, because double matings lead on average to equal paternity for each sperm donor. This indicates that received sperm are randomly mixed in storage. To gain further insight into the mechanisms underlying the process of sperm storage, digestion and utilisation, we investigated the fate of donated sperm at different times after copulation. We find that within 3 h after transfer most sperm have been transported into the sperm-digesting organ. Fluorescent labelling of sperm in histological sections further reveals that allosperm are not stored in the fertilisation pouch, but upstream in either the hermaphroditic duct, seminal vesicles, or ovotestis. Besides contributing to the understanding of the mechanisms underlying sperm competition and/or cryptic sperm choice, this study shows that mixed mating cannot be treated as a separate issue in hermaphroditic animals. © Springer Science+Business Media B.V. 2008

    Un individu "albinos" d'Arion rufus L capturé dans l'IsÚre.

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    Larambergue M. de. Un individu "albinos" d'Arion rufus L capturĂ© dans l'IsĂšre.. In: Bulletin mensuel de la SociĂ©tĂ© linnĂ©enne de Lyon, 16ᔉ annĂ©e, n°10, dĂ©cembre 1947. pp. 198-201

    Les Cloportes et la biologie générale (d'aprÚs les travaux du Professeur A. Vandel)

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    Larambergue M. de. Les Cloportes et la biologie gĂ©nĂ©rale (d'aprĂšs les travaux du Professeur A. Vandel). In: Bulletin mensuel de la SociĂ©tĂ© linnĂ©enne de Lyon, 15ᔉ annĂ©e, n°3, mars 1946. pp. 18-20

    L. Berner : Le peuplement des coques de bateaux à Marseille. Bull. Institut Océanographique Monaco, N° 858, 19 février 1944

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    Larambergue M. de. L. Berner : Le peuplement des coques de bateaux Ă  Marseille. Bull. Institut OcĂ©anographique Monaco, N° 858, 19 fĂ©vrier 1944. In: Bulletin mensuel de la SociĂ©tĂ© linnĂ©enne de Lyon, 13ᔉ annĂ©e, n°7-8, Septembre-octobre 1944. p. 112

    L. Berner : Le peuplement des coques de bateaux à Marseille. Bull. Institut Océanographique Monaco, N° 858, 19 février 1944

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    Larambergue M. de. L. Berner : Le peuplement des coques de bateaux Ă  Marseille. Bull. Institut OcĂ©anographique Monaco, N° 858, 19 fĂ©vrier 1944. In: Bulletin mensuel de la SociĂ©tĂ© linnĂ©enne de Lyon, 13ᔉ annĂ©e, n°7-8, Septembre-octobre 1944. p. 112

    Un Nouveau Bouquet De La Flore Du Tarn

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    Volume: 14Start Page: 61End Page: 6

    Sur Une Nouvelle Esp\ue8ce Du Genre Colchicum

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    Volume: 2Start Page: 688End Page: 68

    Les Cloportes et la biologie générale (d'aprÚs les travaux du Professeur A. Vandel) (suite)

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    Larambergue M. de. Les Cloportes et la biologie gĂ©nĂ©rale (d'aprĂšs les travaux du Professeur A. Vandel) (suite). In: Bulletin mensuel de la SociĂ©tĂ© linnĂ©enne de Lyon, 15ᔉ annĂ©e, n°4, avril 1946. pp. 26-27
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