Midnight sinking behaviour in Calanus finmarchicus: a response to satiation or krill predation?
作者： GA Tarling , T Jarvis , SM Emsley , JBL Matthews
DOI: 10.3354/MEPS240183
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摘要: The vertical migration of Calanus finmarchicus and krill (Meganyctiphanes norvegica Thysanoessa raschii ) was monitored during the summer 1999 in Clyde Sea using a combi- nation acoustic net sampling methods. A moored 300 kHz Doppler current profiler (ADCP) identified sound scattering layer (SSL) that started to ascend surface last moments daylight. Net samples showed SSL mostly composed krill. C. finmarchi- cus rose late afternoon, causing small but detectable increase backscatter did not vary time through summer. ascent krill, by contrast, became earlier as day length decreased towards autumn. strong downward velocities following rise caused descent finmarchicus. fact this co- ordinated sinking occurred autumn, even though remained constant, implies feeding 'window' diminished over course season. Feeding conditions become significantly better same period, dis- counting satiation likely cause descent. close temporal coupling between arrival subsequent from suggests midnight is response predation.
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