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Der Einfluß einiger aÜßerer Faktoren auf die geschiechtliche Entwicklung und die Segmentbildung bei Anaitides mucosa (Annelida, Polychaeta, Phyllodocidae)
Author(s) -
Röhrkasten Axel
Publication year - 1984
Publication title -
marine ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 58
eISSN - 1439-0485
pISSN - 0173-9565
DOI - 10.1111/j.1439-0485.1984.tb00312.x
Subject(s) - polychaete , biology , zoology , ecology
. The influence of some exogenous factors (temperature, day‐length, starving, amputation of caudal segments) on oocyte development and on somatic growth in the polychaete Anaitides mucosa has been investigated. Animals from Wimereux (France) were maintained in the laboratory from September to April. Like in other polychaetes with a breeding season in early spring oocytes grow in two waves. The second one only occurs after spawning of the first and shows an accelerated growth. Low temperatures (5 o C) ( i. e. winter conditions) are essential for a qualitative normal development of the first wave, whilst higher temperatures (15 o C) totally suppress maturation of oocytes and reproduction. The influence of day‐length, however, is probably without importance. Starving and amputation of caudal segments to do not produce significant changes in the growth rate of oocytes, either. In contrast, the somatic growth is most extensive at high temperatures (15 o C) and long‐day photoperiods (LD 16/8). Zusammenfassung Eine normal verlaufende Entwicklung der Oocyten von Anaitides mucosa findet nur während einer längeren Periode mit niedrigen Temperaturen (5 o C) statt. Hungerbedingungen und Regenerationsprozesse, ausgelöst durch die Amputation caudaler Segmente, beeinflussen die Entwicklung der Oocyten bei niedrigen Temperaturen nicht. Die Oocytenentwicklung ist nicht abhängig von der Photoperiode. Das somatische Wachstum ist dagegen an höhere Temperaturen (15 o C) und in geringerem Umfange an Langtag‐Bedingungen (LD 16/8) gebunden.