✦ LIBER ✦

Field experiments on egg production in the fresh-water Sponge Spongilla lacustris

✍ Scribed by John J. Gilbert; Tracy L. Simpson; George S. Nagy

Book ID: 104617558
Publisher: Springer
Year: 1975
Tongue: English
Weight: 753 KB
Volume: 46
Category: Article
ISSN: 1573-5141
DOI: 10.1007/bf00038723

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✦ Synopsis

Short (0 .3 cm) and long (1 .5-2 .5 cm) lengths of laboratory-stored branches of gemmulated S . lacustris were implanted in the pond of origin on three dates approximately one, two, and three months after the time of normal gemmule hatching . The sponges derived from these implants produced eggs in both old and new tissue for three to four weeks following gemmule hatching . The significance of these results with respect to the control of egg production in natural populations is discussed .

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✍ Brauer, Elizabeth B. 📂 Article 📅 1975 🏛 John Wiley and Sons 🌐 English ⚖ 937 KB

## Abstract External medium passed through the canal system of small __Spongilla lacustris__ at the rate of 70 body volumes per hour, allowing for little or no modification of its composition by the animal. Consequently any osmotic gradient between medium and animal was experienced at the cell leve