Abstract
Growth of the test ofStrongylocentrotus intermedius was examined with the aid of tetracycline. In summer specimens, tetracycline fluorescence was not observable in the plates, except in the apical system and its adjacent area. An array of fibrous elements with a milky white autofluorescence was oriented perpendicularly to each suture line. In winter specimens the elements were evident only in demineralized sections. The growth gradient of each plate estimated on winter specimens was as follows: longitudinal sture » inner surface = mammelon and part of boss in tubercle > latitudinal suture > outer surface of base of spine shaft > outer surface of plate itself. The mature test as a whole increases in size by two modes of growth, an addition of new plates to the apical system and an accretion on fixed sites of each plate. The results suggest that fibrous elements are involved in the test growth, and that there is a different mechanism of the test growth between summer and winter specimens. The apical system may be equipped with a specific mechanism of calcification which permits an active formation of new plates throughout the year.
Résumé
La croissance de la carapace deStrongylocentrotus intermedius est étudiée à l'aide de la tétracycline. Des specimens de l'été ne présentent pas de fluorescence dans les plaques, sauf dans le système apical et les régions voisines. Un faisceau d'éléments fibreux, présentant une autofluorescence blanche laiteuse, est orienté perpendiculairement à chaque ligne de suture. Les spécimens de l'hiver ne présentent ces éléments qu'après décalcification des coupes. La croissance de chaque plaque, chez ces derniers s'effectue de la façon suivante: suture longitudinale » surface interne = mamelon et bosse du tubercule > suture transversale > surface externe de la base de l'épine dorsale > surface externe de la plaque. La carapace adulte augmente de taille selon deux mécanismes de croissance: d'une part, par adjonction de nouvelles plaques au système apical et, d'autre part, par apposition sur des régions données de chaque plaque. Il apparait que des éléments fibreux sont intéressés par la croissance de la carapace et qu'un mécanisme différent de croissance s'observe dans les carapaces de l'été et de l'hiver. Le système apical semble se calcifier selon un mécanisme spécifique qui permet une formation active de plaques nouvelles pendant toute l'année.
Zusammenfassung
Das Wachstum des Skeletes vonStrongylocentrotus intermedius wurde mit Hilfe von Tetracyclin untersucht. Bei Sommerexemplaren konnte die Tetracyclinfluorescenz in den Platten nicht beobachtet werden, außer im apicalen System und seiner anliegenden Umgebung. Eine Menge von fibrösen Elementen mit einer milchig-weißen Autofluorescenz war senkrecht zu jeder Nahtlinie angeordnet. Bei Winterexemplaren waren diese Elemente nur in demineralisierten Schnitten deutlich sichtbar. Der Wachstumsgradient jeder Platte war bei Winterexemplaren der folgende: Longitudinalnaht » innere Oberfläche = Terminalknopf und Hals der Tuberkel > Latitudinalnaht > Oberfläche der Basis des Stachels > äußere Oberfläche der Platte selbst. Das ausgewachsene Skelet als Ganzes vergrößert seinen Umfang auf zwei Wachstumsarten, einerseits durch Zusatz von neuen Platten zum apikalen System, anderseits durch Zuwachs an bestimmten Stellen von jeder Platte. Die Resultate lassen vermuten, daß fibröse Elemente am Skeletwachstum beteiligt sind und daß der Mechanismus dieses Wachstums bei Sommer- und bei Winterexemplaren verschieden ist. Es wäre denkbar, daß das apikale System auf einen spezifischen Mechanismus der Verkalkung ansprechen würde, welcher eine aktive Bildung neuer Platten während des ganzen Jahres erlaubt.
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Kobayashi, S., Taki, J. Calcification in sea urchins. Calc. Tis Res. 4, 210–223 (1969). https://doi.org/10.1007/BF02279124
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DOI: https://doi.org/10.1007/BF02279124