Table 1.
Mean testes mass (SD), somatic mass (SD), standard length (SD), mean slope, and 95% CI of slope of the testes mass to body mass relationship of male Brachyrhaphis rhabdophora from five low‐predation populations and four high‐predation populations. Also included are means and slopes for combined samples
| Predation environment | Population ID | n males | Mean somatic dry mass (SD) mg | Mean testes dry mass (SD) mg | Mean standard length (SD) mm | Slope of the testes to body mass relationship | Upper and lower 95% confidence interval | R 2 |
|---|---|---|---|---|---|---|---|---|
| Low‐predation | 21 | 36 | 66.7 (42.4) | 1.6 (1.1) | 25.2 (4.4) | 0.28 | −0.20 to 0.75 | 0.04 |
| 19 | 46 | 98.1 (31.7) | 1.2 (0.5) | 28.0 (2.6) | 0.64 | 0.35 to 0.94 | 0.31 | |
| 20 | 27 | 107.4 (52.4) | 1.6 (0.9) | 30.4 (4.7) | 0.70 | 0.46 to 0.93 | 0.60 | |
| 27 | 19 | 61.3 (41.1) | 0.6 (0.3) | 25.0 (3.8) | 0.23 | −0.29 to 0.75 | 0.05 | |
| 33 | 27 | 69.3 (46.9) | 1.3 (0.7) | 24.1 (5.1) | 0.67 | 0.41 to 0.93 | 0.52 | |
| Combined | 155 | 80.6 (20.7) | 1.3 (0.4) | 26.5 (2.6) | 0.49 | 0.33 to 0.66 | 0.19 | |
| High‐predation | 11 | 22 | 31.1 (17.5) | 1.5 (1.2) | 19.4 (2.9) | 0.45 | −0.32 to 1.23 | 0.07 |
| 4 | 28 | 72.9 (38.7) | 2.2 (1.8) | 24.5 (3.8) | 0.22 | −0.42 to 0.86 | 0.02 | |
| 9 | 34 | 76.1 (42.4) | 0.9 (0.6) | 26.6 (4.3) | 0.68 | 0.32 to 1.04 | 0.31 | |
| 23 | 15 | 40.7 (23.6) | 0.6 (0.2) | 22.0 (3.9) | 0.39 | −0.08 to 0.87 | 0.20 | |
| Combined | 99 | 55.2 (22.7) | 1.3 (0.71) | 23.1 (3.11) | 0.38 | 0.19 to 0.73 | 0.09 | |
| All samples combined | 254 | 69.3 (24.2) | 1.3 (0.5) | 25.0 (3.2) | 0.44 | 0.24 to 0.68 | 0.14 |