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Material properties of Northeast Pacific zooplankton

机译：东北太平洋浮游动物的物质特性

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摘要

We measured the density and sound speed contrasts relative to seawater of Northeast Pacific zooplankton. The density contrast (g) was measured for euphausiids, decapods (Sergestes similis), amphipods (Primno macropa, Phronima sp., and Hyperiid spp.), siphonophore bracts, chaetognaths, larval fish, crab megalopae, larval squid, and medusae. Morphometric data (length, width, and height) were collected for these taxa. Density contrasts varied within and between zooplankton taxa. The mean and standard deviation (s.d.) for euphausiid density contrast were 1.059 ± 0.009. Relationships between zooplankton density contrast and morphometric measurements, geographic location, and environmental conditions were investigated. Site had a significant effect on euphausiid density contrast. Density contrasts of euphausiids collected in the same geographic area ～4-10 d apart were significantly higher (p ＜ 0.001). Sound speed contrast (h) was measured for euphausiids and pelagic decapods (S. similis) and it varied between taxa. The mean and s.d. for euphausiid sound speed were 1.019 ± 0.009. Euphausiid mass was calculated from measured density and volume, and a relationship between euphausiid mass and length was produced. We determined that euphausiid volume could be accurately estimated from two-dimensional measurements of animal body shape, and that biomass (or biovolume) could be accurately calculated from digital photographs of animals. Data from this study can improve the accuracy of theoretical acoustic scattering models for these taxa, resulting in more accurate estimates of zooplankton biomass in this region.
机译：我们测量了东北太平洋浮游动物相对于海水的密度和声速对比。测量了粉刺、,足类（Sergestes similis），两栖类（Primno macropa，Phronima sp。和Hyperiid spp。），虹吸管片，石嘴鱼，幼虫鱼，巨蟹科，幼体鱿鱼和中成虫的密度对比（g）。收集了这些分类单元的形态数据（长度，宽度和高度）。浮游生物类群内部和之间的密度对比各不相同。上腹部组织密度对比的平均值和标准偏差（s.d.）为1.059±0.009。浮游动物密度对比与形态测量，地理位置和环境条件之间的关系进行了调查。部位对羊膜瘤样密度对比有显着影响。在距离约4-10 d的同一地理区域收集的紫杉类的密度差值明显更高（p ＜0.001）。测量了上腹部和上足十足动物（S. similis）的声速对比度（h），并且在不同的分类单元之间变化。均值和标准差Euphausiid声速为1.019±0.009。从测量的密度和体积计算出上腹部的质量，并且产生上腹部的质量与长度之间的关系。我们确定，可以通过动物体形的二维测量准确地估算出上腹部的体积，并且可以从动物的数码照片中准确地计算出生物量（或生物量）。这项研究的数据可以提高这些类群的理论声散射模型的准确性，从而可以更准确地估算该区域的浮游生物量。

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