Swimbladders under pressure: anatomical and acoustic responses by walleye pollock
Swimbladders under pressure: anatomical and acoustic responses by walleye pollock
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DOI：
10.1093/icesjms/fsp101
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发表时间：
2006-10
影响因子：
3.3
通讯作者：
J. Horne;K. Sawada;K. Abe;R. Kreisberg;D. Barbee;K. Sadayasu
中科院分区：
文献类型：
--
作者：
J. Horne;K. Sawada;K. Abe;R. Kreisberg;D. Barbee;K. Sadayasu
Horne， J. K, Sawada， K, Abe， K, Kreisberg， R. B, Barbee， D. H和Sadayasu， K. 2009。压力下的膀胱：狭鳕的解剖和声学反应。-海洋科学学报，66:000-000。压力通过改变鱼鳔的体积和表面积来影响鱼的回声强度。体积减小预计符合波义耳定律（体积a压力21），但在几何散射频率下，变形膀胱背侧表面积对物理学家目标强度（TS）的影响尚未被量化。研究人员在压力室中拍摄了3条幼年狭鳕（Theragra chalcogramma）的背部和侧位x线片，在环境至最大4.9 ~ 10.5 Pa（即5 atm）范围内对其膀胱进行成像。另外16条0组、21条幼鱼和28条成鱼的x光片用于比较不同生活史阶段的膀胱大小和形状。定向椭圆偏心率描述了背侧面和侧面的相对压缩，用来定义膀胱形状及其变化。随着压力的增加，膀胱背侧的表面积以恒定的速率减少。个体之间的膀胱体积减少是相似的，但比波义耳定律预测的要少。压迫在背腹平面最大，前后不对称。Kirchhoff-ray模式后向散射模型预测，当环境压力从4.9 ~ 10.5 Pa增加到38 kHz和120 kHz时，TS降低了4 dB。
Horne, J. K., Sawada, K., Abe, K., Kreisberg, R. B., Barbee, D. H., and Sadayasu, K. 2009. Swimbladders under pressure: anatomical and acoustic responses by walleye pollock. – ICES Journal of Marine Science, 66: 000–000. Pressure influences echo intensities from fish through changes in swimbladder volumes and surface areas. Volume reduction is expected to correspond to Boyle’s law (volume a pressure 21 ), but the effects of deforming the dorsal-aspect surface area of the swimbladder on the target strength (TS) of a physoclist have not been quantified at geometric scattering frequencies. Dorsal and lateral radiographs of three juvenile walleye pollock (Theragra chalcogramma) in a pressure chamber were used to image swimbladders from ambient to a maximum of 4.9 � 10 5 Pa (i.e. 5 atm). Radiographs from an additional 16 0-group, 21 juvenile, and 28 adult fish were used to compare swimbladder sizes and shapes across life-history stages. The directional elliptical eccentricity, which describes the relative compression in dorsal and lateral planes, was formulated to define swimbladder shapes and their variation. As pressure increased, dorsal-aspect surface areas of the swimbladder decreased at a constant rate. Swimbladder-volume reductions were similar among individuals, but less than those predicted by Boyle’s law. Compression was greatest in the dorsal– ventral plane and asymmetric anterior to posterior. The Kirchhoff-ray mode backscatter model predicted that TS at 38 and 120 kHz decreased by 4 dB as pressure increased from ambient to 4.9 � 10 5 Pa.