Estimating digestion time in gelatinous predators: a methodological comparison with the scyphomedusa Aurelia aurita

Estimating digestion time in gelatinous predators: a methodological comparison with the scyphomedusa Aurelia aurita
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估计胶状捕食者的消化时间:与 scyphomedusa Aurelia aurita 的方法学比较

DOI:
10.1007/s00227-012-2134-z
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发表时间:
2012
期刊:
影响因子:
2.4
通讯作者:
FitzGeorge-Balfour T
FitzGeorge-Balfour T
中科院分区:
生物学2区
文献类型:
--
作者:
FitzGeorge-Balfour T

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为了量化胶质捕食者的营养影响,消化时间估计通常应用于肠道中的猎物计数。使用三种主要方法,人工喂养,自然喂养和稳态方法;这些方法及其基本假设不同。用于定义消化终点的标准以及观察消化进展的分辨率在不同研究中也有所不同。为了了解这种差异的影响,我们估计消化时间scyphomedusaAurelia auritafed成年女性的桡足类Acartia tonsausing这些不同的方法。我们发现~四倍的差异,这可以归因于某些终点标准偏向最慢消化速率,以及低观察分辨率的高估。人工操作以及游泳和进食行为的自然程度也可能影响估计数。我们为那些定量消化时间ofAurelia auritamedusae和凝胶捕食者提供了建议。
In order to quantify the trophic impact of gelatinous predators, digestion time estimates are commonly applied to counts of prey in the guts. Three primary approaches are used, the Manual-feeding, Natural-feeding and Steady-state methods; these differ in methodology and their underlying assumptions. The criteria used to define the end-point of digestion, and the resolution at which digestion progress is observed, also vary across studies. To understand the impact of such differences, we estimate digestion times of the scyphomedusaAurelia auritafed adult females of the copepodAcartia tonsausing these various approaches. We find ~fourfold differences which can be attributed to bias towards the slowest rates of digestion by some end-point criteria, and overestimation from low observation resolution. Artificial manipulation and the degree to which swimming and feeding behaviour are natural may also influence estimates. We provide recommendations for those quantifying digestion times ofAurelia auritamedusae and gelatinous predators.
加拿大不列颠哥伦比亚省萨尼奇湾的水母和栉水母的每日配给和捕食
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