Naslov
The consortium of Spongilla lacustris, Ephydatia fluviatilis and Dreissena polymorpha in the Lake Constance.

Autori
Pfannkuchen, Martin ; Gugel, Jochen ; Brümmer, Franz

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Jahrestagung der Deutschen Gesellschaft für Limnologie (DGL) 2005 / Deutschen Gesellschaft für Limnologie - Berlin : Weissensee Verlag, 2005, 214-214

ISBN
978-3-9805678-7-9

Skup
Jahrestagung der Deutschen Gesellschaft für Limnologie (DGL) 2005

Mjesto i datum
Karlsruhe, Njemačka, 26.09.2005. - 30.09.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Spongillidae; dreissena polymorpha; porifera; depth distribution

Sažetak
Dreissena polymorpha (Bivalvia, Dreissenidae) acts as an edificator in the observed consortium. Ephydatia fluviatilis (Porifera, Spongillidae) is the main epibiont accompanied by specific organisms like Hydra sp., Plumatella sp., Asselus aquaticus, and Atyaephyra desmaresti. Spongilla lacustris (Porifera, Spongillidae) as the second sponge species builds a dense population which can be observed above a discrete borderline in a depth of – 14 m. Beneath we find E. fluviatilis growing on D. polymorpha. We stress that a thin borderline between two non-overlapping sponge populations is formed, that does not fall together with any physical border like the thermocline. Still the role of canards well known to be feeding on D. polymorpha is to be investigated. The interactions between the three species do not only lead to the strict correlation of E. fluviatilis and D. polymorpha, but to a substantial alteration of the sponges` macroscopic morphology as well, which is new and not described yet. Body shape is massive and globular. The attachment site to substratum is rather small. The canal system, as one of the key morphological features, is organised with one large atrium and only one single large osculum. The lifecycle of E. fluviatilis normally includes reduction forms and the formation of gemmulae as resting stages during winter. The observed population shows no reductions forms and no formation of gemmulae. But we can find gemmuloscleres, skeleton elements characteristic for the species, and normally used for the formation of gemmulae.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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