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Author (up) Farkas, A.; Szaz, D.; Egri, A.; Barta, A.; Meszaros, A.; Hegedus, R.; Horvath, G.; Kriska, G. url  doi
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  Title Mayflies are least attracted to vertical polarization: A polarotactic reaction helping to avoid unsuitable habitats Type Journal Article
  Year 2016 Publication Physiology & Behavior Abbreviated Journal Physiol Behav  
  Volume 163 Issue Pages 219-227  
  Keywords Animals  
  Abstract Like other aquatic insects, mayflies are positively polarotactic and locate water surfaces by means of the horizontal polarization of water-reflected light. However, may vertically polarized light also have implications for the swarming behaviour of mayflies? To answer this question, we studied in four field experiments the behavioural responses of Ephoron virgo and Caenis robusta mayflies to lamps emitting horizontally and vertically polarized and unpolarized light. In both species, unpolarized light induces positive phototaxis, horizontally polarized light elicits positive photo- and polarotaxis, horizontally polarized light is much more attractive than unpolarized light, and vertically polarized light is the least attractive if the stimulus intensities and spectra are the same. Vertically polarized light was the most attractive for C. robusta if its intensity was about two and five times higher than that of the unpolarized and horizontally polarized stimuli, respectively. We suggest that the mayfly behaviour observed in our experiments may facilitate the stability of swarming above water surfaces. Beside the open water surface reflecting horizontally polarized light, the shadow and mirror image of riparian vegetation at the edge of the water surface reflect weakly and non-horizontally (mainly vertically) polarized light. Due to their positive polarotaxis, flying mayflies remain continuously above the water surface, because they keep away from the unpolarized or non-horizontally polarizing edge regions (water surface and coast line) of water bodies. We also discuss how our findings can explain the regulation of mayfly colonization.  
  Address Danube Research Institute, MTA Centre for Ecological Research, H-1113 Budapest, Karolina ut 29-31, Hungary; Group for Methodology in Biology Teaching, Biological Institute, Eotvos University, H-1117 Budapest, Pazmany setany 1, Hungary. Electronic address: kriska@ludens.elte.hu  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0031-9384 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:27178399 Approved no  
  Call Number LoNNe @ kyba @ Serial 1501  
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