Using 3D photogrammetry from ROV video to quantify cold-water coral reef structural complexity and investigate its influence on biodiversity and community assemblage
Using 3D photogrammetry from ROV video to quantify cold-water coral reef structural complexity and investigate its influence on biodiversity and community assemblage
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DOI：
10.1007/s00338-019-01827-3
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发表时间：
2019-06
期刊：
影响因子：
3.5
通讯作者：
D. Price;K. Robert;Alexander Callaway;Claudio Lo lacono;R. Hall;V. Huvenne
中科院分区：
文献类型：
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作者：
D. Price;K. Robert;Alexander Callaway;Claudio Lo lacono;R. Hall;V. Huvenne
浅水环境中造礁珊瑚形成的精细结构复杂性对生物多样性、物种组合和功能性状表达有影响。冷水珊瑚礁也是生物多样性的热点地区，这通常归因于珊瑚提供的坚硬表面和结构复杂性。然而，与浅水珊瑚礁不同，冷水珊瑚礁的这种复杂性很少在厘米尺度上量化，因此从未以类似的方式与珊瑚礁居民社区联系起来。从运动中提取结构的技术，从一系列照片中创建高分辨率的栖息地3D模型，正越来越多地被利用，与3D空间分析相结合，以创建有用的3D指标，如粗糙度。在这里，我们展示了使用的3D重建的冷水珊瑚礁的深度近1000米的探险家峡谷，一个支流的Whittard峡谷，东北大西洋的视频样带数据。我们使用Agisoft Photoscan软件构建了40个约25米长的视频断面的3D模型，从而实现了亚厘米分辨率的重建。数字高程模型被用来获得rugosity指标，和orthomosaics用于珊瑚覆盖评估。我们发现粗糙度值相媲美的浅水热带珊瑚礁粗糙度。礁和附近的非礁社区不同的组合组成，这是由深度和粗糙度。物种丰富度，底栖动物丰富度和鱼类丰富度增加与结构的复杂性，被归因于增加的壁龛，食物，住所和物理水运动的改变。生物多样性在较高的粗糙度上达到稳定，说明了一个特定的珊瑚礁群落的建立，该群落由超过30%的珊瑚覆盖率支持。死亡珊瑚的比例，活珊瑚群落结构的影响有限，相反，内礁模式的解释深度和粗糙度，虽然我们的研究结果在一定程度上混淆了多重共线性。细尺度结构的复杂性似乎是不可分割的冷水珊瑚礁社区的本地规模的生态模式。
Fine-scale structural complexity created by reef-building coral in shallow-water environments is influential on biodiversity, species assemblage and functional trait expression. Cold-water coral reefs are also hotspots of biodiversity, often attributed to the hard surface and structural complexity provided by the coral. However, that complexity has seldom been quantified on a centimetric scale in cold-water coral reefs, unlike their shallow-water counterparts, and has therefore never been linked in a similar way to the reef inhabitant community. Structure from motion techniques which create high-resolution 3D models of habitats from sequences of photographs is being increasingly utilised, in tandem with 3D spatial analysis to create useful 3D metrics, such as rugosity. Here, we demonstrate the use of ROV video transect data for 3D reconstructions of cold-water coral reefs at depths of nearly 1000 m in the Explorer Canyon, a tributary of Whittard Canyon, NE Atlantic. We constructed 40 3D models of approximately 25-m-length video transects using Agisoft Photoscan software, resulting in sub-centimetre resolution reconstructions. Digital elevation models were utilised to derive rugosity metrics, and orthomosaics were used for coral coverage assessment. We found rugosity values comparable to shallow-water tropical coral reef rugosity. Reef and nearby non-reef communities differed in assemblage composition, which was driven by depth and rugosity. Species richness, epifauna abundance and fish abundance increased with structural complexity, being attributed to an increase in niches, food, shelter and alteration of physical water movement. Biodiversity plateaued at higher rugosity, illustrating the establishment of a specific reef community supported by more than 30% coral cover. The proportion of dead coral to live coral had limited influence on the community structure; instead, within-reef patterns were explained by depth and rugosity, though our results were confounded to a certain extent by multi-collinearity. Fine-scale structural complexity appeared to be integral to local-scale ecological patterns in cold-water coral reef communities.