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Using laser optics to illuminate high-resolution video-recordings, we revealed behavioural mechanisms through which males of the calanoid copepod speciesTemora longicornis locate females. Males of T. longicornis swam at signi¢cantly faster speeds than females along more sinuous routes, possibly re£ecting adaptations to increase encounter with females. Upon(More)
Small organisms in the ocean, such as zooplankton, are subject to fluid forces imposed by the turbulent velocity field. For instance, turbulent motion increases the contact rate among Studies indicate that several plankton species may avoid active turbulent surface layers by swimming downward to the pycnocline (Heath et al. 1988; Mackas et al. 1993;(More)
We quantified the flow field generated by tethered and free-swimming Euchaeta antarctica using the particle image velocimetry (PIV) technique. The streamlines around the free-swimming specimens were generally parallel to the body axis, whereas the streamlines around all of the tethered copepodids demonstrated increased curvature. Differences noted in the(More)
Recent advances in computational methods have made realistic large-scale simulations of animal locomotion possible. This has resulted in numerous mathematical and computational studies of animal movement through fluids and over substrates with the purpose of better understanding organisms' performance and improving the design of vehicles moving through air(More)
Velocity measurements were performed for the flow field generated by tethered krill Euphausia pacifica. The particle image velocimetry (PIV) technique was used to measure the velocity field in vertical planes aligned with the krill body axis. The krill generates a narrow jet-like flow behind and below the pleopods (roughly 25 below horizontal). The volume(More)
We investigated the effects of a common mysid predator, Neomysis americana on the mating success of an estuarine copepod, Eurytemora herdmani. The presence of a mysid predator, or only a predator cue, reduced copulation frequency and spermatophore transfer success of E. herdmani, and led to a substantial decrease in E. herdmani nauplius production. Thus,(More)
Krill are aquatic crustaceans that engage in long distance migrations, either vertically in the water column or horizontally for 10 km (over 200,000 body lengths) per day. Hence efficient locomotory performance is crucial for their survival. We study the swimming kinematics of krill using a combination of experiment and analysis. We quantify the propulsor(More)
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The small-scale spatial and temporal dynamics of phycosphere-sized chemical signals entrained within the feeding current of copepods is quantified here by combining flow visualization techniques with electrochemical technology (IVEC-10). Using the 30-␮m electrochemical probe sampling at 50 Hz and the velocity gradients created by two marine copepods, we(More)