Marine Biology

, Volume 16, Issue 3, pp 236–252 | Cite as

Veränderungen der Eikapselvolumina während der entwicklung verschiedener Opisthobranchier-Arten (Mollusca, Gastropoda)

  • A. Kress
Article

Zusammenfassung

  1. 1.

    An 8 weiteren Nudibranchierarten wurden auf Grund der Durchmesser von Eiern und Kapseln deren Volumina nach der Ablage, sowie diejenigen der Kapseln während der Entwicklung bis zum Schlüpfen berechnet. Mit den so erhaltenen Werten lassen sich folgende Zusammenhänge analysieren: (a) das Größenverhältnis zwischen Eikapsel-und Eizellvolumen unmittelbar nach der Ablage; (b) das Größenverhältnis zwischen den Kapselvolumina bestimmter Entwicklungsstadien bis zum Schlüpfen und denjenigen unmittelbar nach der Ablage (Vergrößerungsfaktor).

     
  2. 2.

    Bei Elysia viridis findet keine Volumenzunahme der Kapseln während der Entwicklung statt. Catriona aurantia, Tergipes despectus, Eubranchus exiguus, E. cingulatus, E. pallidus, E. farrani und Janolus cristatus dagegen zeigen deutlich eine Zunahme des Kapselvolumens.

     
  3. 3.

    Die Zunahme des Kapselvolumens erfolgt vor allem zum Zeitpunkt der Ausbildung von Velum, Velarcilien und Fuß. Das Ausmaß der Volumenzunahme sowie dessen Intensität während bestimmter Entwicklungsperioden sind artspezifisch verschieden und können selbst innerhalb der gleichen Familie beträchtlich variieren.

     
  4. 4.

    Die Längen der Veligerschalen sind bei allen untersuchten Arten den Eidurchmessern direkt proportional.

     
  5. 5.

    In der Diskussion wird auf mögliche Faktoren, die zur Volumenzunahme der Kapseln führen könnten (beginnende Exkretion der Larvalnieren, Zusammensetzung der Kapselflüssigkeit, Einflüsse der Salinität), eingegangen.

     

Abstract

An attempt has been made to estimate volumes of eggs and egg-capsules employing the formula of the rotationellipsoid. Measurements of the following stages have been made: immediately after oviposition; blastula; gastrula; appearance of velumanlage; velarcilia, foot and velum small; velarcilia, foot and velum distinct; 1 to 2 days before hatching; hatching. Calculations permitt analysis of: (1) relationship between egg-case volume and egg-volume; (2) capsule volumes during development until hatching in comparison to those after oviposition (enlargement factor). The sacoglossan nudibranch Elysia viridis shows no increase in capsule volume during development. The nudibranchs Catriona aurantia, Tergipes despectus, Eubranchus exiguus, Eubranchus cingulatus, Eubranchus pallidus, Eubranchus farrani and Janolus cristatus reveal a distinct increase in capsule volume when velarcilia, foot, and velum appear. The degree of eggcapsule enlargement and its intensity during development exhibit interspecific differences. The results of this and of a previous paper (Kress, 1971) are compared and discussed with respect to possible explanations for the enlargements, (e.g. excretion of larval kidneys, composition of capsular fluid, influence of salinity).

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Copyright information

© Springer-Verlag 1972

Authors and Affiliations

  • A. Kress
    • 1
  1. 1.Abteilung Anatomie der Rheinisch-Westfälischen Technischen Hochschule AachenAachenGermany (FRG)

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