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image of Crustaceana

Hyalella azteca from a laboratory culture, were maintained under conditions designed to allow assessment of growth, development and reproduction. Newly born H. azteca were approximately 1 mm in length (0.04 mg wet weight) and reached a maximum of about 7 mm (8 mg) at an approximate age of 120 days. Generally, mean size of males was greater than that of females. Adult male H. azteca had an intermoult period of 20 days (range 8-43 days) and females 11 days (10-13 days). Sex of male H. azteca could be identified at 19-21 days of age and first precopula was found as early as 23 days. The number of neonates produced by a single female ranged from 3-17 (mean 9) and significantly correlates with the length of the female. The mean time spent in precopula ranged from 1-7 days and animals took 4-12 days to re-enter precopula after separating.

Hyalella azteca aus bestehenden Laborkulturen wurden unter Bedingungen gehalten, die es erlaubten, Wachstum, Entwicklung und Fortpflanzung zu verfolgen. Neu geborene H. azteca wiesen eine Körperlänge von ungefähr 1 mm (0.04 mg Nassgewicht) auf und erreichten nach ungefähr 120 Tagen ihre Maximallänge von etwa 7 mm (8 mg). Die Durchschnittsgröße der männlichen Tiere war dabei höher als die der weiblichen. Der Zeitraum zwischen den Häutungen betrug bei adulten Männchen 20 Tage (8-43 Tage), bei adulten Weibchen 11 Tage (10-13 Tage). Bei männlichen H. azteca konnte das Geschlecht nach 19-21 Tagen bestimmt werden, und schon nach 23 Tagen wurden erste Tiere in Präkopula gefunden. Ein einzelnes Weibchen brachte 3-17 Neonaten hervor, wobei die Zahl der Neonaten signifikant mit der Körperlänge des Tieres korrelierte. Die Präkopula dauerte 1-7 Tage und bis zur nächsten Präkopula dauerte es 4-12 Tage nach der vorherigen Trennung.

Affiliations: 1: School of Biosciences, Cardiff University, P.O. Box 915, Cardiff CF10 3TL, United Kingdom


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