Functional trade-offs in the limb muscles of dogs selected for running vs. fighting.

摘要: The physical demands of rapid and economical running differ from those fighting such that functional trade-offs may prevent simultaneous evolution optimal performance in both behaviours. Here we test three hypotheses trade-off by measuring determinants limb musculoskeletal function two breeds domestic dogs have undergone intense artificial selection for (Greyhound) or (Pit Bull). We found Greyhounds Pit Bulls having relatively less muscle mass distally their limbs, weaker muscles forelimbs than hindlimbs, a much greater capacity elastic storage the in-series tendons extensor ankle joints. These observations are consistent with hypothesis specialization can limit vice versa. suggest locomotor abilities widespread taxonomically.