. Bulletin. Science; Natural history; Natural history. O Figure 3. Male courtship repertories in two populations of Xenotoca eiseni. (Numbers to the left of displays indicate percent frequency; numbers to the right are percent effectiveness in achieving copulation.) Xenotoca eiseni.—Males from the Rio Tamazula exhibited five courtship displays: fish from Manan- tial El Sacristan had four (Fig. 3). The Loop Dance, Half-Dance, Lateral T-formation, Lateral Wheeling, and Oblique displays comprised the dis- play repertory of Rio Tamazula males; males from Manantial El Sacristan did not perform the
. Bulletin. Science; Natural history; Natural history. O Figure 3. Male courtship repertories in two populations of Xenotoca eiseni. (Numbers to the left of displays indicate percent frequency; numbers to the right are percent effectiveness in achieving copulation.) Xenotoca eiseni.—Males from the Rio Tamazula exhibited five courtship displays: fish from Manan- tial El Sacristan had four (Fig. 3). The Loop Dance, Half-Dance, Lateral T-formation, Lateral Wheeling, and Oblique displays comprised the dis- play repertory of Rio Tamazula males; males from Manantial El Sacristan did not perform the Oblique display. The most elaborate display was the Loop Dance, in which the male executed a series (one to six, usually four) of figure-eight movements slightly above (about half a body length) and one to two body lengths ahead of a swimming female. If the female was swimming rapidly, the forward pro- gression of the male approximated her swimming speed so that the Dance appeared more like a series of stretchcd-out loops than smooth figure- eights. At the end of each leg of the Dance, the male turned back to describe a loop before con- tinuing. During turning movements, the male strongly inclined the dorsal and espccialh the anal fins toward the female. When turning, a Rio Tamazula male exhibited exaggerated sigmoid flexures and often tilted so much that the vertical plane of his body became nearly horizontal. A male from Manantial El Sacristan lacked sigmoid posturing throughout the display and, when turn- ini;, the fish tilted only rareh and \er\ sliiihlh. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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