Metabolism recovery of a stromatolitic biofilm after drought in a Mediterranean stream fig: 3
Metabolism recovery of a stromatolitic biofilm after drought in a Mediterranean stream fig: 3
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地中海溪流干旱后叠层石生物膜的代谢恢复图：3
DOI：
10.1127/archiv-hydrobiol/140/1997/261
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发表时间：
1997
影响因子：
1
通讯作者：
S. Sabater
中科院分区：
文献类型：
--
作者：
A. Romani;S. Sabater
生活在地中海溪流中的生物需要适应干旱时期。拉索拉纳河在1994年夏天完全干涸。在实验室实验中，通过将生物膜浸泡在溪流中来研究生物膜的恢复。拉索拉纳有一个厚厚的叠层石生物膜，由蓝细菌Rivularia sp.和Schizothrix spp.组成。复湿后立即测定胞外酶活性（β-葡萄糖苷酶、β-木糖苷酶和磷酸酶）、H14 CO 3掺入量和呼吸作用（电子传递系统-ETS-活性），然后每小时测定一次，持续5 h。ETS和光合活性低，在开始的复湿，但两个小时后显着增加。生物膜中的酶活性的恢复是立即的，因为在0小时测量的值是类似于干旱前在流中获得的。酶活性显着增加后3小时，以更高的值比干旱前报道的。所有活动在实验结束时稳定到初始值。我们认为，可以支持的叠层石结构的拉索拉纳生物膜作为储备的有机物，以及快速复水的蓝藻鞘提供的生物膜代谢的快速恢复。这意味着生物膜可以利用干燥夏季的短降雨期。
Organisms dwelling in Mediterranean streams need to be adapted to dry periods. La Solana stream dried out completely during summer 1994. The recovery of the biofilm was studied in a laboratory experiment by immersing it in stream water. La Solana has a thick stromatolitic biofilm composed of the cyanobacteria Rivularia sp. and Schizothrix spp. Ectoenzymatic microbial activities (β-glucosidase, β-xylosidase and phosphatase), H 14 CO 3 incorporation and respiration (Electron Transport System-ETS-activity) were measured immediately after rewetting and then every hour for 5 h. Both ETS and photosynthetic activities were low at the beginning of the rewetting but increased significantly after two hours. Recovery of enzymatic activities in the biofilm was immediate, since values measured at 0h were similar to those obtained in the stream before drought. Enzymatic activities increased markedly after three hours to higher values than those reported before drought. All activities stabilized to initial values at the end of the experiment. We suggest that the rapid recovery of the biofilm metabolism could be supported by the stromatolitic structure of La Solana biofilm acting as a reserve of organic matter, as well as the rapid rehydration provided by the cyanobacteria sheaths. This implies that the biofilm can exploit short rainfall periods in dry summers.