Alstons singing mouse (Scotinomys teguina) and Chiriqu singing mice (S. xerampelinus) inhabitnonoverlapping elevation zones in the mountains

Alston’s singing mouse (Scotinomys teguina) and Chiriquí singing mice (S. xerampelinus) inhabitnonoverlapping elevation zones in the mountains of Central America. Experiments by Pasch et al.(2013) showed that the boundary between the two occupied zones is mediated by competition, andthat S. xerampelinus mice are more aggressive and behaviorally dominant over S. teguina mice. Malesof both species sing at high frequencies to attract mates and repel rivals. Because S. teguina isbehaviorally subordinate, the researchers hypothesized that S. teguina males would avoid areas wherethe songs of S. xerampelinus mice could be heard. To test this, 24 S. teguina males were each playedone of three types of sound from a loudspeaker in the laboratory: songs from their own species, songsfrom the other species, or control sounds (white noise having the same frequency range as the mousesongs). They recorded the fraction of time the S. teguina mice spent near the loudspeaker as the response variable. The data are below.

a. Calculate the mean and standard error for each treatment group.

b. Conduct an appropriate test of whether the mean time near speaker is different among these three groups. Show the ANOVA table for this test.

c. The results of a Tukey–Kramer analysis on these data is in the table below. Do S. teguina mice avoid the songs of their own species, compared to the controls, or are they attracted? Do S. teguina mice avoid the songs of the other species compared to controls?

Transcribed Image Text:

S. teguina song: 0.95,0.95, 0.90,0.90, 0.85,0.85, 0.71,0.71, 0.61,0.61, 0.45,0.45, 0.68,0.68, 0.720.72