Benthic biomass size spectra in shelf and deep-sea sediments
Benthic biomass size spectra in shelf and deep-sea sediments
复制标题
陆架和深海沉积物中的底栖生物量大小谱
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
A. Yool
中科院分区：
文献类型：
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作者：
B. Kelly;Adrian P. Martin;B. Bett;T. R. Anderson;J. Kaariainen;C. Main;C. Marcinko;A. Yool
对三个对比地点的海洋底栖Meta动物（小型至大型动物，1 µg-32 mg湿重）的生物量分布进行了调查，以检验异速生长可以一致地解释生物量谱中观察到的趋势的假设。生物量（和丰度）的大小光谱，确定在法罗群岛-设得兰海峡（FSC）在东北大西洋（水深1600米），在北海（150米）的弗拉登地面（FG），和缺氧阿曼边缘（OM）在阿拉伯海（500米）的观测。在FG（标度指数，bD 0：16）和FSC（bD 0：32），观察到的生物量随体型的增加呈幂律关系，但在OM（bD 0：12，但与0无显著差异），观察到的生物量增加不太令人信服。构建了一个简单的模型来代表用于观察光谱的相同的16个后生动物大小类别，所有这些都依赖于共同的碎屑食物库，并允许摄食、呼吸和死亡这三个关键过程与身体大小成比例。一个微观遗传算法被用来拟合模型的观察网站。该模型准确地再现了所观察到的缩放，而不需要包括局部影响，如缺氧的影响。我们的研究结果表明，规模缩放的死亡率和摄入量的主导因素，确定分布的生物量在对比海洋沉积物群落的小型到大型底栖动物的大小范围。观测结果和模型结果都与“生态学代谢理论”在预测几何体大小类别的生物量的四分之一幂尺度方面大致一致。
The biomass distributions of marine benthic meta- zoans (meio- to macro-fauna, 1 µg-32 mg wet weight) across three contrasting sites were investigated to test the hy- pothesis that allometry can consistently explain observed trends in biomass spectra. Biomass (and abundance) size spectra were determined from observations made at the Faroe-Shetland Channel (FSC) in the Northeast Atlantic (water depth 1600 m), the Fladen Ground (FG) in the North Sea (150 m), and the hypoxic Oman Margin (OM) in the Arabian Sea (500 m). Observed biomass increased with body size as a power law at FG (scaling exponent, bD 0:16) and FSC (bD 0:32), but less convincingly at OM (bD 0:12 but not significantly different from 0). A simple model was con- structed to represent the same 16 metazoan size classes used for the observed spectra, all reliant on a common detrital food pool, and allowing the three key processes of ingestion, respi- ration and mortality to scale with body size. A micro-genetic algorithm was used to fit the model to observations at the sites. The model accurately reproduces the observed scal- ing without needing to include the effects of local influences such as hypoxia. Our results suggest that the size-scaling of mortality and ingestion are dominant factors determining the distribution of biomass across the meio- to macrofaunal size range in contrasting marine sediment communities. Both the observations and the model results are broadly in agree- ment with the "metabolic theory of ecology" in predicting a quarter power scaling of biomass across geometric body size classes.