Differences in standard metabolic rate at the range edge versus the center of an expanding invasive population of <i>Xenopus laevis</i> in the West of France

Louppe, Vivien; Courant, Julien; Videlier, Mathieu; Herrel, Anthony

doi:10.1111/jzo.12548

Cited by 23 publications

(41 citation statements)

References 77 publications

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“…3A-C). Previous studies (Louppe et al 2017(Louppe et al , 2018 have shown that individuals from the periphery have a greater stamina and a lower standard metabolic rate (SMR) for their body size. Larger muscles with longer fibres should result in greater power output and faster contractile velocity, traits that likely enhance jumping performance (James et al 2007).…”

Section: Muscle Architecturementioning

confidence: 99%

“…Consequently, differences in dispersal capacity between individuals from the centre and the front of the range should be reflected in traits that enhance dispersal capacity. Hind limb length has previously been demonstrated to be greater, for example, in animals from the range edge (Louppe et al 2017). However, whether other anatomical differences exist remains to be tested.…”

Section: Introductionmentioning

confidence: 99%

“…Their range has been increasing ever since and encompasses more than 207 km² (Measey et al 2012), with a dispersal rate estimated at 0.5-2 km a year (Grosselet et al 2006). Previous studies have shown that individuals at the dispersal front show a higher in vivo endurance capacity and a lower standard metabolic rate (SMR) than individuals from populations near the centre of the range (Louppe et al 2017(Louppe et al , 2018. Moreover, animals at the dispersal front show a lower investment in reproduction compared with animals from the centre of the range ).…”

Section: Introductionmentioning

confidence: 99%

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

2019

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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 rangeedge 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 range edge had a heavier heart but lighter stomach than those of the centre of the range. Future studies comparing the morphology between native and invasive populations in other regions or for other species will be especially insightful to better understand the possible adaptive changes in invasive populations and the limits on dispersal capacity.

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Section: Muscle Architecturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2019

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“…There is a growing number of biological invasions where spatial selection for a dispersal phenotype on the expanding front has been demonstrated. Morphological divergence of dispersal‐related traits in vanguard populations has been observed in amphibians, for example in Australia with the invasive cane toad ( Rhinella marina ) and in France with the invasive African clawed frog ( Xenopus laevis ) (Phillips et al ., ; Louppe, Courant & Herrel, ). Similarly, reduced parasite prevalence in range‐edge populations has been demonstrated with the blue striped snapper ( Lutjanus kasmira ) in Hawaii and the common house geckos ( Hemidactylus frenatus ) in Australia (Gaither et al ., ; Coates et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Morphological divergence and reduced ectoparasite prevalence in an introduced population of a Caribbean anole

Bodden

Puschendorf

2019

Journal of Zoology

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As biological invasions become increasingly common understanding what factors drive a species’ ability to rapidly colonize new habitats will be important for future conservation management. Theoretical models predict that spatial sorting of an invasive population will select for enhanced dispersal‐related traits and lower prevalence of parasitic infections. Supporting these, there is a growing body of evidence that demonstrates both features are common in invasive populations, although, these observations stem from mainland systems, over larger spatial scales. Here, we investigated the morphology and ectoparasite prevalence of Maynard's anole (Anolis maynardi) in its native range Little Cayman, and across its introduced range Cayman Brac where it invaded 31 years ago. We tested for morphological divergence, ectoparasite prevalence between the native population and the core, intermediate and range edge populations within the introduced range. In addition, we compared the overall body condition of lizards from each sex between islands using the scaled‐mass index. Our results suggest that spatial sorting could have selected for less parasitized individuals on the range edge of the introduced population, across an area of just 39 km2. However, there was no difference in hind‐limb length, the character that is expected to enhance dispersal ability, across the range of the introduced population. Instead, the greatest variation in morphology across the introduced range was found in fore‐limb length. Finally, both males and females from the introduced population were of significantly higher body condition than the native population, yet ectoparasite intensity had no effect on the body condition of infested hosts. These results highlight the rapid change in forelimb length and overall morphology has occurred rapidly since the species’ first introduction and a clear reduction in parasite prevalence on the range edge of the introduced population. Together these attributes have likely contributed to the successful colonization of Cayman Brac by A. maynardi.

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“…Further, we apply this conceptual model to juvenile life stages, a critically understudied life history stage that coincides with transitional movement from aquatic to terrestrial habitats (Cline & Hunter, ; Ramírez, Bell, Germano, Bishop, & Nelson, ; Roe & Grayson, ). Laboratory‐based quantification of individual performance measures, such as jumping ability, speed, and endurance, has been commonly used as proxies for individual dispersal and natural movement (Binning, Shaw, & Roche, ; Llewelyn, Phillips, Alford, Schwarzkopf, & Shine, ; Louppe, Courant, & Herrel, ; Phillips, Brown, Webb, & Shine, ). Body size and morphology have also been important determinants of individual performance and in some cases dispersal (John‐Alder & Morin, ; Yagi & Green, ).…”

Section: Introductionmentioning

confidence: 99%

The integrative effects of behavior and morphology on amphibian movement

Bredeweg

Morzillo

Thurman

et al. 2019

Ecology and Evolution

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Animal movement and dispersal are key factors in population dynamics and support complex ecosystem processes like cross‐boundary subsidies. Juvenile dispersal is an important mechanism for many species and often involves navigation in unfamiliar habitats. For species that metamorphose, such as amphibians, this transition from aquatic to terrestrial environments involves the growth and use of new morphological traits (e.g., legs). These traits strongly impact the fundamental ability of an organism to move in novel landscapes, but innate behaviors can regulate choices that result in the realized movements expressed. By assessing the integrative role of morphology and behavior, we can improve our understanding of juvenile movement, particularly in understudied organisms like amphibians. We assessed the roles of morphological (snout‐vent length and relative leg length) and performance (maximal jump distance) traits in shaping the free movement paths, measured through fluorescent powder tracking, in three anuran species, Pacific treefrog (Hyliola regilla), Western toad (Anaxyrus boreas), and Cascades frog (Rana cascadae). We standardized the measurement of these traits to compare the relative role of species' innate differences versus physical traits in shaping movement. Innate differences, captured by species identity, were the most significant factor influencing movement paths via total movement distance and path sinuosity. Relative leg length was an important contributor but significantly interacted with species identity. Maximal jump performance, which was significantly predicted by morphological traits, was not an important factor in movement behavior relative to species identity. The importance of species identity and associated behavioral differences in realized movement provide evidence for inherent species differences being central to the dispersal and movement of these species. This behavior may stem from niche partitioning of these sympatric species, yet it also calls into question assumptions generalizing anuran movement behavior. These species‐level effects are important in framing differences as past research is applied in management planning.

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Differences in standard metabolic rate at the range edge versus the center of an expanding invasive population of Xenopus laevis in the West of France

Cited by 23 publications

References 77 publications

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

Morphological divergence and reduced ectoparasite prevalence in an introduced population of a Caribbean anole

The integrative effects of behavior and morphology on amphibian movement

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