Succession of Antarctic benthic algae (Potter Cove, South Shetland Islands): structural patterns and glacial impact over a four-year period
Succession of Antarctic benthic algae (Potter Cove, South Shetland Islands): structural patterns and glacial impact over a four-year period
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DOI：
10.1007/s00300-017-2197-x
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发表时间：
2018-02-01
期刊：
影响因子：
1.7
通讯作者：
Liliana Quartino, Maria
中科院分区：
文献类型：
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作者：
Campana, Gabriela L.;Zacher, Katharina;Liliana Quartino, Maria
目前普遍缺乏关于南极洲海洋底栖藻类演替的资料。我们进行了两个殖民实验，在上潮下带（3和5米深）使用人工基质在波特湾（南设得兰群岛）：在外湾，主要不受沉积的区域，并在内湾，在靠近退缩的冰川，特别是在融化季节的高沉积物流入。四年来，总的季节和年际变化，硅藻和大型藻类覆盖，物种组成和生态指标进行了评估。瓷砖进行了分析，在春季和夏季在实验室和全年摄影监测。辐照度（光合有效辐射和紫外线辐射），盐度和温度进行了监测，每月。底栖藻类占主导地位的组合，与大型藻类达到类似的70%覆盖两年后。硅藻垫（主要是羽状形式）和大型藻类覆盖的贡献有站点和时间上的差异。硅藻覆盖率较高的冰川影响的网站，特别是在早期阶段，并随着时间的推移显着下降。年与年之间，大型藻类组合发生显着变化，在特定地点的方式。组合主要包括一年生和假多年生植物种在这两个网站，没有成年大Desmarestiales。虽然两个实验的建立间隔了一年，但随着时间的推移，覆盖的变化似乎受到竞争相互作用的控制，物种更替的模式也出现了收敛模式。然而，内湾网站表现出较低数量的大型藻类类群和多样性下降的趋势，随着时间的推移，可能与冰川的影响所造成的更高水平的压力和干扰。
There is a general lack of information on the succession of marine benthic algae in Antarctica. We performed two colonization experiments in the upper subtidal (3 and 5 m depth) using artificial substrates in Potter Cove (South Shetland Islands): in the outer cove, an area mainly unaffected by sedimentation, and in the inner cove, in close proximity to a retreating glacier, with high sediment inflow particularly during the melting season. Seasonal and interannual changes in total, diatom and macroalgal cover, species composition, and ecological indexes were assessed over four years. Tiles were analysed in spring and summer in the laboratory and by year-round photographic monitoring. Irradiance (photosynthetically active radiation and ultraviolet radiation), salinity, and temperature were monitored on a monthly basis. Benthic algae dominated the assemblages, with macroalgae reaching similar to 70% cover after two years. There were site and temporal differences in the contribution of diatom mats (mainly pennate forms) and macroalgal cover. Diatom cover was higher at the glacier-influenced site, particularly at the early stages, and decreased significantly with time. Between years, macroalgal assemblages changed significantly in a site-specific manner. Assemblages mainly comprised annual and pseudoperennial species at both sites, with absence of adult large Desmarestiales. Although a year separated the establishment of the two experiments, there were convergence patterns in the changes of cover over time-that seemed to be controlled by competitive interactions-and in the patterns of species replacement. However, the inner cove site exhibited lower number of macroalgal taxa and a tendency to decreased diversity over time that could be related to higher level of stress and disturbance caused by glacial influence.