Metabolism and chemical composition of marine pelagic amphipods: synthesis toward a global bathymetric model
Metabolism and chemical composition of marine pelagic amphipods: synthesis toward a global bathymetric model
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海洋中上层片足类动物的代谢和化学成分：全球测深模型的综合
DOI：
10.1007/s10872-013-0177-5
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发表时间：
2013
影响因子：
2.3
通讯作者：
T. Ikeda
中科院分区：
文献类型：
--
作者：
T. Ikeda
汇编了来自世界海洋上至深海区的18-32种片脚类（双生类和双足类）的呼吸和氨排泄数据以及化学成分数据[含水量、灰分、碳(C)、氮(N)和C:N比值]。自变量包括体重、栖息地温度和中采样深度均是呼吸的显著预测因子，占数据方差的65 ~ 83%，而前两个变量是氨排泄的显著预测因子，占数据方差的64 ~ 77%。原子O:N比率（呼吸：氨排泄）范围从11到74（中位数为21.5）。碳组成与生境温度呈负相关，含水量、灰分、氮和碳氮比与这3个自变量均不相关。根据碳氮比判断，蛋白质被认为是大多数中上层片脚类动物的主要有机成分。然而，在bbb50 500 m深度的一些片脚类动物表现出较高的碳氮比（>0），表明体内有大量脂质沉积。结果表明，远洋片脚类动物的呼吸速率与远洋桡足类动物的呼吸速率接近，但高于远洋桡足类动物的呼吸速率，这反映了这三个类群的身体形态和游泳行为。作为身体化学成分的一个显著特征，远洋片脚类动物由于拥有强健的外骨骼，表现出极高的灰分含量（平均占DM的25%）。
Respiration and ammonia excretion data and chemical composition data [water content, ash, carbon (C), nitrogen (N) and C:N ratios] of 18–32 amphipods (hyperiids and gammarids) from the epipelagic through bathypelagic zones of the world’s oceans were compiled. The independent variables including body mass, habitat temperature and mid-sampling depth were all significant predictors of respiration, accounting for 65–83 % of the variance in the data, while the former two variables were significant predictors of ammonia excretion, accounting for 64–77 % of the variance. Atomic O:N ratios (respiration:ammonia excretion) ranged from 11 to 74 (median 21.5). C composition was negatively correlated with habitat temperature, but water contents, ash, N, and the C:N ratio were uncorrelated with the three independent variables. As judged by C:N ratios, protein was considered to be the major organic component of most pelagic amphipods. However, some amphipods from >500 m depth exhibited high C:N ratios (>10) suggesting a large deposition of lipids in the body. Comparison of the present results with global bathymetric models of euphausiids and pelagic copepods revealed that respiration rates of the pelagic amphipods were near-equal to the rates of euphausiids but greater than the rates of pelagic copepods, reflecting taxon-specific body morphology and swimming behavior among the three taxa. As a marked feature of body chemical composition, the pelagic amphipods exhibited extremely high ash content (mean 25 % of DM) due to their possession of a robust exoskeleton.