TISSUE SLOUGHING IN THE SPONGE HALICHONDRIA-PANICEA - A FOULING ORGANISM PREVENTS BEING FOULED
TISSUE SLOUGHING IN THE SPONGE HALICHONDRIA-PANICEA - A FOULING ORGANISM PREVENTS BEING FOULED
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DOI：
10.1007/bf00379109
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发表时间：
1989-01-01
期刊：
影响因子：
2.7
通讯作者：
WOLFRATH, B
中科院分区：
文献类型：
--
作者：
BARTHEL, D;WOLFRATH, B
将海绵Halichondria panicea Pallas的样品保持在15 ℃的流动海水水族箱中。C斯劳在三周的时间间隔内脱落它们完整的外层组织层。松弛开始于眼孔的边缘，并在两周内扩展到整个表面。对组织薄片的显微镜检查表明，它们含有大量不同的活生物体，以及生物碎片，如桡足类甲壳和硅藻硅藻细胞壳。在刚脱落的海绵组织上没有发现这样的群落。脱落后，H.圆锥花序明显改变，因为特征性的软海绵状网被内部海绵组织典型的不规则骨针阵列所取代。当H.将panicea保存在充满0.2 μ m过滤海水的封闭水族箱中，在3个月的维护期间没有发生脱落。由于这些海绵脱落它们的外部组织同时稳定地生长，组织脱落可以被认为是对海绵表面上的有机材料的沉积和小生物体的沉降的反应。因此，海绵抵消了其口的堵塞，并防止在其表面上建立微生物结垢群落，从而抑制进一步的结垢过程。
Specimens of the sponge Halichondria panicea Pallas kept in running sea-water aquaria at 15.degree. C slough off their complete outer tissue layer in regular intervals of three weeks. Sloughing starts at the rim of the oscula and extends over the whole surface within two weeks. Microscopic inspection of the tissue flakes shows them to harbour large numbers of different live organisms, as well as biogenic debris such as pieces of copepod carapaces and diatom frustules. No such community is found on freshly sloughed sponge tissue. After sloughing, the surface skeletal structure of H. panicea is markedly altered, as the characteristic halichondroid reticulum has been replaced by the irregular spicule array typical for the inner sponge tissue. When H. panicea is kept in closed aquaria filled with 0.2 .mu.m filtered sea-water, no sloughing occurs during 3 months of maintenance. As those sponges shedding their outer tissue grow steadily at the same time, the tissue sloughing can be regarded as a reaction to sedimentation of organic material and settlement of small organisms on the sponge surface. The sponge thus counteracts clogging of its ostia and prevents the establishment of a micro fouling community on its surface, inhibiting further fouling processes.