Improving the estimation of deep-sea megabenthos biomass: dimension to wet weight conversions for abyssal invertebrates
Improving the estimation of deep-sea megabenthos biomass: dimension to wet weight conversions for abyssal invertebrates
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DOI：
10.3354/meps11769
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发表时间：
2016-06-23
影响因子：
2.5
通讯作者：
Ruhl, Henry A.
中科院分区：
文献类型：
--
作者：
Durden, Jennifer M.;Bett, Brian J.;Ruhl, Henry A.
深海巨型动物生物量的评估通常采用底栖雪橇和拖网取样的方法，但非破坏性方法，特别是摄影，正变得越来越普遍。使用从有限数量的分类群的测量拖网捕捞标本中获得的方程，可以估计海底照片中的个体湿重。然而，由于缺乏适当的转换系数，对涵盖整个社区的分类群的估计有限。在这里，我们编译测量的身体尺寸和保存的湿重之间的关系，为一个全面的目录的深海底栖巨型动物，使用类似的47 000个标本豪猪深海平原（东北大西洋）的发现收藏（国家海洋学中心，南安普顿，英国）。该方法的实际应用表明，使用一个非常大的数据集的标本测量海底照片在同一位置。我们还整理了相应的现场数据鲜湿重，以估计固定在福尔马林和工业变性酒精保存的表观生物量的影响。具有相当比例的软组织的分类群在保存期间损失35至60%的湿重，而具有较大比例的硬组织的分类群损失10至20%。我们的总估计鲜湿重生物量的海参和刺胞动物的照片图形调查是类似的20倍，以前估计的总无脊椎动物生物量的基础上拖网渔获物。巨型底栖生物量的急剧上升对现存量、群落代谢和底栖碳流数值模拟的研究具有重要意义。
Deep-sea megafaunal biomass has typically been assessed by sampling with benthic sledges and trawls, but non-destructive methods, particularly photography, are becoming increasingly common. Estimation of individual wet weight in seabed photographs has been achieved using equations obtained from measured trawl-caught specimens for a limited number of taxa. However, a lack of appropriate conversion factors has limited estimation across taxa encompassing whole communities. Here we compile relationships between measured body dimensions and preserved wet weights for a comprehensive catalogue of abyssal epibenthic megafauna, using similar to 47 000 specimens from the Porcupine Abyssal Plain (NE Atlantic) housed in the Discovery Collections (National Oceanography Centre, Southampton, UK). The practical application of the method is demonstrated using an extremely large dataset of specimen measurements from seabed photographs taken in the same location. We also collate corresponding field data on fresh wet weight, to estimate the impact of fixation in formalin and preservation in industrial denatured alcohol on the apparent biomass. Taxa with substantial proportions of soft tissues lose 35 to 60% of their wet weight during preservation, while those with greater proportions of hard tissues lose 10 to 20%. Our total estimated fresh wet weight biomass of holothurians and cnidarians in the photo graphic survey was similar to 20 times the previous estimates of total invertebrate biomass based on trawl catches. This dramatic uplift in megabenthic biomass has significant implications for studies of standing stocks, community metabolism, and numerical modelling of benthic carbon flows.