Observations of neutral buoyancy in diapausing copepods Calanoides acutus during Antarctic winter
Observations of neutral buoyancy in diapausing copepods Calanoides acutus during Antarctic winter
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南极冬季滞育桡足类 Calanoides acutus 中性浮力的观测
DOI：
10.1007/s00300-014-1525-7
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发表时间：
2014
期刊：
影响因子：
1.7
通讯作者：
Sartoris FJ
中科院分区：
文献类型：
--
作者：
Schründer S;Schnack-Schiel SB;Auel H;Sartoris FJ
草食性南极桡足类哲水蚤（Calanoides acutus）在500 m以下的深度以休眠阶段（滞育）不活跃地越冬。据推测，在滞育C。acutus是中性浮力，以保持能量储备，否则会被游泳活动耗尽。然而，到目前为止，还没有关于其浮力的实验观测报告，我们的浮力调节机制的知识是不完整的。在本研究中，种属特异性差异的浮力进行了视觉评估。观察了C.与另一种食草性桡足类哲水蚤propinquus相比，它在上层水域积极觅食越冬。新鲜捕获的桡足类在3-氨基苯甲酸乙酯（MS 222）的海水溶液中麻醉，以排除游泳运动对浮力控制的影响。结果表明，C. propinquus为负浮力，而diapausingC. acutus保持中性浮力。这是第一个记录，中性浮力滞育桡足类是由生化身体组成，而不需要额外的游泳运动。
The herbivorous Antarctic copepodCalanoides acutusoverwinters inactively in a resting stage (diapause) at depths below 500 m. It is assumed that during diapauseC. acutusis neutrally buoyant in order to retain energy reserves otherwise depleted by swimming activities. However, so far, no experimental observations on its buoyancy have been reported and our knowledge of buoyancy regulation mechanisms is incomplete. In the present study, species-specific differences in buoyancy were assessed visually. Observations were made of specimens from the diapausing cohort ofC. acutusand compared to another herbivorous copepodCalanus propinquus, which overwinters actively feeding in the upper water layers. Freshly caught copepods were anaesthetized in a 3-amino-benzoic acid ethyl ester (MS222) in seawater solution in order to exclude the influence of swimming movements on buoyancy control. It was shown thatC. propinquuswas negatively buoyant, whereas diapausingC. acutusremained neutrally buoyant. This is the first record that neutral buoyancy in diapausing copepods is maintained by the biochemical body composition without the additional need of swimming movements.
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DOI：
--
发表时间：
1991
期刊：
影响因子：
--
作者：
S. Schnack;W. Hagen;E. Mizdalski
通讯作者：
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