English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Dynamics and cellular movements in the locomotion of the sponge Tethya wilhelma

Nickel, M., Vitello, M., & Brümmer, F. (2002). Dynamics and cellular movements in the locomotion of the sponge Tethya wilhelma. Integrative and Comparative Biology, 42(6): 34.1, pp. 1285.

Item is

Files

show Files

Locators

show
hide
Description:
-

Creators

show
hide
 Creators:
Nickel, M, Author
Vitello, MP1, Author              
Brümmer, F, Author
Affiliations:
1External Organizations, ou_persistent22              

Content

show
hide
Free keywords: -
 Abstract: The globular sponge Tethya wilhelma SAR?, SAR?, NICKEL & BRUMMER 2001 (Porifera, Demospongiae, Hadromerida, 0 5-30 mm) is capable of locomotion. Many sponges display very slow body dislocation, but several small species of the genus Tethya are among the fastest (up to 2 mm.h-1). The movement is accompanied by the production of long thin body extensions, which are stabilised by bundles of 800-1350 pm long siliceous spicules (strongyloxeas). Elongation and reduction rate can be higher than 5 mmh-1. Some body exten- sions produce buds for asexual reproduction, while most serve to investigate the environment and reach several cm in length. If an extension reaches substrate somewhere it attaches within minutes. If it doesn't attach anywhere it is reduced. By confocal in vivo laserscanning microscopy and digital time-lapse video-microscopy we investigated the cellular dynamics inside the body extensions. The main cell types are pinacocytes, granulose amoebocytes, multipolar fusiform cells and extremely long (sometimes longer than 200 lim) slender, fusiform actinocytes. The later type is associated with the strongyloxea bundles in the core of the extension. Contraction and active movement of the actinocytes was recorded. We could demostrate that all cell types display active movement.The high cellu- lar dynamic is the driving force of the body dislocation. Movement is directed towards attached extensions which are thickened before- hand by immigrating cells. The question of signalling and integration is addressed with first results on chemical messengers. We present first hypothetical models for cellular sequences involved in the loco- motion of T wilhelma, which may partly be generalised for other sponges.

Details

show
hide
Language(s):
 Dates: 2002-12
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: 3982
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Integrative and Comparative Biology
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: McLean, VA : Society of Integrative and Comparative Biology
Pages: - Volume / Issue: 42 (6) Sequence Number: 34.1 Start / End Page: 1285 Identifier: ISSN: 1540-7063
CoNE: https://pure.mpg.de/cone/journals/resource/954925378947