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Spottier Targets Are Less Attractive to Tabanid Flies: On the Tabanid-Repellency of Spotty Fur Patterns

Figure 4

Colour picture and patterns of the degree of linear polarization d and angle of polarization α (clockwise from the vertical) of a living shady black cattle measured by imaging polarimetry in the blue (450 nm) part of the spectrum.

The optical axis of the polarimeter was horizontal, and the measurement was performed under an overcast sky. In the α-pattern double-headed arrows show the angle of polarization of reflected light at some places of the cattle coat. The background of the animal is white for the sake of a better visualization. The body surfaces of the cow from which light is reflected in a vertical plane polarize horizontally, while those from which light is reflected in a horizontal/oblique plane polarize vertically/obliquely.

Figure 4

doi: https://doi.org/10.1371/journal.pone.0041138.g004