当前位置: X-MOL 学术Mar. Micropaleontol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Growth of Heterostegina depressa under natural and laboratory conditions
Marine Micropaleontology ( IF 1.9 ) Pub Date : 2016-01-01 , DOI: 10.1016/j.marmicro.2015.11.005
Wolfgang Eder 1 , Antonino Briguglio 2 , Johann Hohenegger 1
Affiliation  

The use of micro-computed tomography (μCT) provides a unique opportunity to look inside the shells of larger benthic foraminifera to investigate their structure by measuring linear and volumetric parameters. For this study, gamonts/schizonts and agamonts of the species Heterostegina depressa d'Orbigny were examined by μCT; each single chamber's volume was digitally measured. This approach enables cell growth to be recognised in terms of chamber volume sequence, which progressively increases until reproduction occurs. This sequence represents the ontogeny of the foraminiferal cell and has been used here to investigate controlling factors potentially affecting the process of chamber formation. This is manifested as instantaneous or periodic deviations of the realised chamber volumes derived from modelled growth functions. The results obtained on naturally grown specimens show oscillations in chamber volumes which can be modelled by sums of sinusoidal functions. A set of functions with similar periods in all investigated specimens points to lunar and tidal cycles. To determine whether such cyclic signals are genuine and not the effects of a theoretical model, the same analysis was conducted on specimens held in a closed laboratory facility, as they should not be affected by natural environmental effects. Surprisingly, similar cyclicities were observed in such samples. However, a solely genetic origin of these cycles couldn't be verified either. Therefore, detailed analysis on the phase equality of these growth oscillations have been done. This approach is pivotal for proving that the oscillatory patterns discovered in LBF are indeed genuine signals, and on how chamber growth might be influenced by tidal currents or lunar months.

中文翻译:

在自然和实验室条件下 Heterostegina depressa 的生长

微型计算机断层扫描 (μCT) 的使用提供了一个独特的机会,可以通过测量线性和体积参数来观察大型底栖有孔虫的壳内部,以研究它们的结构。在这项研究中,通过 μCT 检查了 Heterostegina depressa d'Orbigny 物种的 gamonts/schizonts 和 agamonts;每个单室的体积都经过数字测量。这种方法可以根据腔室体积顺序识别细胞生长,该顺序逐渐增加,直到发生繁殖。该序列代表有孔虫细胞的个体发育,并已用于研究可能影响腔室形成过程的控制因素。这表现为从模拟生长函数得出的已实现腔室体积的瞬时或周期性偏差。在自然生长的样本上获得的结果显示了腔室体积的振荡,这可以通过正弦函数的总和来建模。在所有研究样本中具有相似周期的一组函数指向月球和潮汐周期。为了确定此类循环信号是否真实而不是理论模型的影响,对保存在封闭实验室设施中的样本进行了相同的分析,因为它们不应受到自然环境影响。令人惊讶的是,在这些样品中观察到了类似的周期性。然而,这些周期的单独遗传起源也无法得到证实。因此,已经对这些生长振荡的相位平等进行了详细分析。这种方法对于证明 LBF 中发现的振荡模式确实是真正的信号至关重要,
更新日期:2016-01-01
down
wechat
bug