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. 2019 Dec 9;9:18590. doi: 10.1038/s41598-019-54857-w

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Graphical representation of Daphnia longicephala movements and behaviour during the successful PCAs 1–7 & 9. The relative distances of the prey animals to their respective final positions (see Materials and Methods for details) are indicated. The danger zones (DZ) are depicted in light grey, the trap interior zones (TI) in dark grey. The following events are indicated by symbols: an upwards pointing arrow corresponds to a second antennae return stroke, an arrow pointing downwards corresponds to a second antenna downstroke, a double arrow corresponds to an asynchronous second antennae movement, and an asterisk corresponds to trap triggering.