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首页> 外文期刊>Estuarine Coastal and Shelf Science >Overgrowth patterns of the red algae Furcellaria lumbricalis at an exposed Baltic Sea coast: The results of a remote underwater video data analysis
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Overgrowth patterns of the red algae Furcellaria lumbricalis at an exposed Baltic Sea coast: The results of a remote underwater video data analysis

机译：裸露的波罗的海沿岸红藻Furcellaria lumbricalis的过度生长模式：远程水下视频数据分析的结果

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摘要

The exposed coast on the tide-less south-eastern Baltic Sea is generally unsuitable for large perennial, habitat forming plants, such as eelgrass and bladder wrack. In this area the dominant perennial macrophyte, Furcellaria lumbricalis, provides an important substrate for the eggs of commercial fish. This algae is limited to the hard substrates and abundant at depths of 6-10 m. However, the distribution of F. lumbricalis is patchy, probably due to the effects of exposure and abrasion from mobile sediments. It has been proposed that the extent of F. lumbricalis cover relates to substrate size and stability, sediment abrasion, depth and the direction of predominant stormy winds. A remote underwater video equipment was used to obtain records of distribution of these algae. Video footage was segmented into still images from where physical and biological parameters were obtained. F. lumbricalis occurred on cobbles, boulders, and occasionally on pebbles. Cover of algae was greater on boulders surrounded by a stable bottom (boulders) than surrounded by sands and gravels. Cover on cobbles was similar on all bottom types probably due to the movement of this substrate during storms. F. lumbricalis occurred close to the seabed on those substrates on stable bottoms where compared with mobile ones. However, elevation of algae from the seabed and cover patterns depended on depth. According to direction of wind exposure, cover on substrates was greater on sheltered surfaces in comparison to exposed ones, where the F. lumbricalis was dislodged during storms. The distribution of cover of F. lumbricalis may alter according to storm frequency as predicted to take place with changes in climate.
机译：在波罗的海东南部无潮的海岸上，裸露的海岸通常不适合大型多年生栖息地形成植物，例如鳗草和膀胱残骸。在该地区，主要的多年生大型植物，Furcellaria lumbricalis，为商品鱼卵提供了重要的基质。该藻类仅限于硬质基质，并且在6-10 m的深度处丰富。然而，黄褐镰刀菌的分布是片状的，这可能是由于流动沉积物的暴露和磨损造成的。已经提出，黄褐镰刀菌的覆盖范围与基质的大小和稳定性，沉积物的磨损，深度和主要暴风的方向有关。使用远程水下视频设备获取这些藻类的分布记录。视频片段被分割成静止图像，从中获得物理和生物学参数。 F. lumbricalis发生在鹅卵石，巨石上，偶有卵石。在被稳定底部包围的巨石上，藻类的覆盖比被沙子和砾石包围的藻类的覆盖更大。所有底部类型的鹅卵石覆盖都相似，这可能是由于底材在暴风雨期间的移动所致。与活动底物相比，F。lumbricalis发生在海底附近那些底物稳定的底物上。但是，藻类从海床和覆盖层的高度取决于深度。根据风的暴露方向，与在暴风雨中脱落的F. lumbricalis暴露在外的被遮盖表面相比，被遮盖的表面上的被膜覆盖更大。如预测的随着气候变化而发生的暴风雨频发，F。lumbricalis的覆盖范围可能会发生变化。

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