Allocation trade-offs impact organ size and muscle architecture in an invasive population of Xenopus laevis in Western France.

Allocation trade-offs impact organ size and muscle architecture in an invasive population of Xenopus laevis in Western France. J Anat. 2019 Aug 02;: Authors: Padilla P, Courant J, Herrel A Abstract Invasive species are a global scourge and often negatively impact native species. Understanding the expansion and dispersal limits of these species is essential. As previous studies have demonstrated increased locomotor performance for populations at the edge of the range of expanding populations, studies of locomotion including the anatomical and physiological traits underlying dispersal capacity are of interest. We focus here on an invasive population of Xenopus laevis introduced in France nearly forty years ago. Previous studies have demonstrated differences in mobility between populations from the centre and the edge of the invasive range, with individuals from the range edge possessing a higher endurance capacity. We test here whether range-edge frogs show anatomical differences in organs or muscles underlying these observed differences of performance. We dissected 10 males and 10 females from central and range-edge sites (40 animals in total) and measured the mass of their organs and the mass, the length, and the physiological cross-sectional area (PCSA) of 28 hind limb muscles. Our results show anatomical differences with individuals from the range edge possessing heavier, longer and more forceful muscles. Moreover, females from the...
Source: Journal of Anatomy - Category: Anatomy Authors: Tags: J Anat Source Type: research