Prey exoskeletons influence the course of gastric evacuation in Atlantic cod Gadus morhua
Prey exoskeletons influence the course of gastric evacuation in Atlantic cod Gadus morhua
复制标题
DOI：
10.1111/jfb.12005
复制
发表时间：
2013-03-01
影响因子：
2
通讯作者：
Chabot, D.
中科院分区：
文献类型：
--
作者：
Couturier, C. S.;Andersen, N. G.;Chabot, D.
本研究探讨了猎物外骨骼特征对大西洋鳕鱼Gadus morhua胃排空模式的影响。三个不同的阶段，突出了在胃排空的甲壳类动物的猎物，其特征在于一个强大的外骨骼。实验证实，三种虾，Pandalus borealis，Pandalus montagui和Eualus macilentus，以及螃蟹Chionoeclampus opilio，以不同的速度从胃中排出。所有阶段的持续时间增加，增加灰分（和碳酸盐）含量的新鲜猎物。厚度，化学成分和形态的猎物外骨骼都影响胃排空：持续时间的初始延迟，整体排空率和排空率下降的过程结束时。幂指数函数（PEF），其形状参数，很好地描述了这些猎物类型的疏散过程，特别是初始延迟。然而，PEF不允许通过当前胃内容物质量独立于膳食大小来描述排空，这限制了其在估计野生G的消耗率方面的有用性。莫华。为了预测和描述一个强大的外骨骼的猎物的胃排空，因此，建议的平方根函数扩展与初始滞后阶段，耦合到基于机械的圆柱体模型的胃排空。
This study examined the effects of prey exoskeleton characteristics on gastric evacuation patterns in Atlantic cod Gadus morhua. Three distinct stages were highlighted in the gastric evacuation of crustacean prey characterized by a robust exoskeleton. The experiments confirmed that the three shrimp species, Pandalus borealis, Pandalus montagui and Eualus macilentus, and the crab Chionoecetes opilio, were evacuated from the stomach at different rates. The duration of all stages increased with increasing ash (and carbonate) content of the fresh prey. Thickness, chemical composition and morphology of the prey exoskeleton all affected gastric evacuation: duration of initial delay, overall evacuation rate and a decreased evacuation rate at the end of the process. The power exponential function (PEF), with its shape parameter, described the course of evacuation for these prey types well, especially the initial delay. The PEF does not, however, allow describing evacuation by the current stomach content mass independent of meal size, which limits its usefulness in estimating consumption rates of wild G. morhua. To predict and describe gastric evacuation of prey with a robust exoskeleton, it is therefore suggested that the square-root function be expanded with an initial lag phase, coupled to the mechanistically based cylinder model of gastric evacuation.