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COMPARATIVE OBSERVATIONS ON THE EXTERNAL MORPHOLOGY OF SUBITANEOUS AND DIAPAUSE EGGS OF ACARTIA SPECIES FROM SOUTHAMPTON WATER

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[Eggs produced by four Acartia species from the Solent-Southampton Water estuarine system were examined. Acartia tonsa produced two morphologically distinct types of eggs, which were identified as subitaneous and diapause. Diapause eggs from this species were spiny while the subitaneous form had a relatively smooth chorion surface; a second subitaneous egg was produced by A. tonsa, which had significant spine extensions on the surface. Acartia margalefi, A. discaudata, and A. clausi produced only smooth eggs, which were identified as subitaneous. Observations under scanning electron microscopy (SEM) revealed consistent interspecific variations in the texture of the chorion surface of both subitaneous and diapause eggs in all species.

Les oeufs produits par quatre espèces d'Acartia du système estuarien Solent-Southampton ont été examinés. Acartia tonsa a produit deux types d'oeufs morphologiquement distincts, qui ont été identifiés comme oeufs immédiats et oeufs de diapause. Les oeufs de diapause de cette espèce présentaient des épines tandis que la forme immédiate avait une surface chorionique relativement lisse; un second type d'oeuf immédiat a été produit par A. tonsa, qui avait, à sa surface, des extensions épineuses importantes. Acartia margalefi, A. discaudata et A. clausi n'ont produit que des oeufs lisses, qui ont été identifiés comme oeufs immédiats. Des observations réalisées en microscopie électronique à balayage ont rélévé des variations interspécifiques significatives de la texture de la surface du chorion chez les oeufs immédiats comme chez les oeufs de diapause de toutes les espèces., Eggs produced by four Acartia species from the Solent-Southampton Water estuarine system were examined. Acartia tonsa produced two morphologically distinct types of eggs, which were identified as subitaneous and diapause. Diapause eggs from this species were spiny while the subitaneous form had a relatively smooth chorion surface; a second subitaneous egg was produced by A. tonsa, which had significant spine extensions on the surface. Acartia margalefi, A. discaudata, and A. clausi produced only smooth eggs, which were identified as subitaneous. Observations under scanning electron microscopy (SEM) revealed consistent interspecific variations in the texture of the chorion surface of both subitaneous and diapause eggs in all species.

Les oeufs produits par quatre espèces d'Acartia du système estuarien Solent-Southampton ont été examinés. Acartia tonsa a produit deux types d'oeufs morphologiquement distincts, qui ont été identifiés comme oeufs immédiats et oeufs de diapause. Les oeufs de diapause de cette espèce présentaient des épines tandis que la forme immédiate avait une surface chorionique relativement lisse; un second type d'oeuf immédiat a été produit par A. tonsa, qui avait, à sa surface, des extensions épineuses importantes. Acartia margalefi, A. discaudata et A. clausi n'ont produit que des oeufs lisses, qui ont été identifiés comme oeufs immédiats. Des observations réalisées en microscopie électronique à balayage ont rélévé des variations interspécifiques significatives de la texture de la surface du chorion chez les oeufs immédiats comme chez les oeufs de diapause de toutes les espèces.]

Affiliations: 1: School of Ocean and Earth Sciences, University of Southampton, Southampton Oceanography Centre, Empress Dock, Southampton SO14 3ZH, United Kingdom

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/content/journals/10.1163/156854001505479
2001-03-01
2016-09-26

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