|Freilebende Nematoden als Nahrung der Sandgarnele Crangon crangon. Experimentelle Untersuchungen über die Bedeutung der Meiofauna als Nahrung für das marine Makrobenthos|
Gerlach, S.A.; Schrage, M. (1969). Freilebende Nematoden als Nahrung der Sandgarnele Crangon crangon. Experimentelle Untersuchungen über die Bedeutung der Meiofauna als Nahrung für das marine Makrobenthos. Oecologia 2: 362-375
In: Oecologia. Springer: Heidelberg; Berlin. ISSN 0029-8549, more
|Authors|| || Top |
- Gerlach, S.A.
- Schrage, M.
Under laboratory conditions, Crangon crangon of different size classes survived periods of up to 210 days if fed exclusively with free-living nematodes. Experiments were performed with the saprobic nematode species Panagrellus redivivus which is of similar size (0.0003-0.0015 mg dry weight) as marine freeliving species and which is in the same way accepted as food by the shrimps. The shrimps are able to catch nematodes out of a sandy substratum at a rate of 5 nematodes/min, but they do so for only about 30 minutes, stopping after ingesting approximately 0.2 mg dry weight of nematodes. Thus the food intake is much less than with macrofauna prey, e.g. with the polychaete Lanice of which a shrimp may ingest 1.5 mg at one sitting. 20 mm long specimens of Crangon feeding on nematodes had a maximum food intake of 1.5 mg dry weight per day only which explains why growth was insignificant (1 mm in 25-74 days) or non-existent.Shrimps left without food died within 27-47 days. Even if these animals, especially the larger ones, could not prosper on an exclusive diet of nematodes, in the absence of better food natural meiofauna populations may prevent Crangon crangon from starving to death.