Thaise Ricardo de Freitas, Eduardo Tadeu Bacalhau, S. T. Disaró
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引用次数: 2
摘要
有孔虫是分布广泛、数量丰富的原生生物,是海洋碳循环的积极参与者。它们的生物量可能占深海中新生宙总生物量的近一半。有孔虫生物量经常通过几何模型和生物体积估算来评估,因为它是非破坏性的,这使得可以估计来自古生态、博物馆和活样本的个体。为了提高有孔虫生物体积和生物量评估的准确性,我们评估并提出了207个有孔虫类群的几何模型和实验中各物种的平均细胞占用率。测量单个测试尺寸以计算体积(µm³),并测量测试的细胞占用率(PCO)以评估生物体积(µm³)。这些数据被转换成单个生物量测量值(µg / d - 1)。我们的高种内和种间PCO差异表明,每个物种的平均PCO比先前文献中断言的整个组合的预定固定百分比更准确地代表了占用的自然变异性。给出了基于测试尺寸与体积关系的回归方程。几何模型、PCO调整和方程将减少有孔虫生物体积和生物量评估的时间、精力和差异。因此,这些结果可以提高有孔虫生物量在未来的使用和可靠性,促进其在以下方面的应用:(1)不同的方法,包括碳通量估算;(2)确定气候变化对海洋营养网的影响;(3)环境监测计划。
Biovolume Method for Foraminiferal Biomass Assessment: Evaluation of Geometric Models and Incorporation of Species Mean Cell Occupancy
Foraminifers are widespread, highly abundant protists and active participants in marine carbon cycling. Their biomass might represent almost half of the total meiobenthic biomass in the deep sea. Foraminiferal biomass is frequently assessed through geometric models and biovolume estimates due to its non-destructive nature, which allows estimates of individuals from palaeoecological, museum, and living samples. To increase the accuracy of foraminiferal biovolume and biomass assessment we evaluate and propose geometric models for 207 foraminiferal taxa and the species’ average cell occupancy of the test. Individual test dimensions were measured to calculate volume (µm³), and the percent of cell occupancy (PCO) of the test was measured to assess the biovolume (µm³). These data were converted into individual biomass measurements (µg Corg ind−1). Our high intra- and interspecific PCO variance suggest that a mean PCO for each species represents the natural variability of occupancy more accurately than a predetermined fixed percentage for the whole assemblage, as previously asserted in the literature. Regression equations based on the relationship between test dimensions and volumes are presented. The geometric models, the PCO adjustment, and the equations will reduce time, effort, and discrepancies in foraminiferal biovolume and biomass assessments. Therefore, these results can improve the use and reliability of foraminiferal biomass in the future, facilitating its use in (1) distinct approaches including carbon flux estimations, (2) determining the effects of climate change on the marine trophic webs, and (3) environmental monitoring programs.
期刊介绍:
JFR publishes original papers of international interest dealing with the Foraminifera and allied groups of organisms. Review articles are encouraged.