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. 2020 Feb 25;10:3409. doi: 10.1038/s41598-020-60122-2

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Changes to body condition across a species range. (a) GBIF and iNaturalist observational sites and sampled populations of a California endemic amphibian (Taricha torosa). The inset map depicts the spatial distribution of a focal population in the southern distribution within Santa Monica Mountains National Recreation Area (SMMNRA). (b) Longitudinal body condition data collected from sampled populations (northern: 2012–2016; southern: 2008–2016) highlight a significant general reduction in mean body condition (20% loss, respectively) across the southern distribution from 2008–2016 (GLMM, F_1,25 = 46.45, p < 0.001). Grey bands surrounding trend lines show 95% confidence intervals for both distributions. The dashed segment of the trend line in the northern distribution represents extrapolated data. Maps were rendered in R³⁵ using packages ggplot2³⁶ and ggmap³⁷.