Table 1.
Lateral speckles categories in male fish X. variata.
Fig 1.
Experimental tank to follow the predatory behaviors displayed by snake T. melanogaster over the fish X. variata.
A- compartment for experimental snake, B- pool filled with water containing sediments, into which the experimental fish were placed, C- window with dark blue cellophane paper to prevent the snakes from seeing the observer while he recorded the predatory behavior. The dashed arrows show the angle of incidence of two neon lamps light. One lamp was directed at an angle of 45° to the pool, and the other was above the pool so that light was reflected from the speckles of the male fish.
Table 2.
Concentration of suspended solids (mg /l) in six concentrations of water turbidity.
Table 3.
Factor structure of the first two roots for LDFA of each behavioral response displayed by snake T. melanogaster over male fish X. variata.
Fig 2.
Plot showing average position (centroid) of predatory behavior of 18 treatments displayed by snake T. melanogaster, depending of three categories (few, median, many) of number of lateral iridescent specks, on the male fish X. variata and five categories of water turbidity (100, 80, 60, 40, 20 and 0%).
The first two roots of LDFA account the 88.2% variability. The position of centroids on the first root were positively associated to variations to visual fixation (a) and orientations of snakes (b), while on the second root centroid position were positively associated to orientation and slow crawling. Plot show contours of visual fixation and orientation displayed of snakes when snakes were exposed to a gradient of turbidity and number of speckles.