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Data from: Elevated human impact on islands increases the introduction and extinction status of native insular reptiles

Cite this dataset

Jesse, Wendy et al. (2024). Data from: Elevated human impact on islands increases the introduction and extinction status of native insular reptiles [Dataset]. Dryad. https://doi.org/10.5061/dryad.qjq2bvqqc

Abstract

In the Anthropocene, the ranges of introduced species are expanding, while extinction-prone species are contracting. Introductions and extinctions are caused by how species respond to human impacts, but it is unknown why the ranges of some species expand and some contract. Here, we test whether this opposite response of human impact is due to introduced and extinction-prone species falling at opposite ends of geographic, evolutionary, or ecological trait continua. We constructed a database of native range maps, traits, phylogenetic relationships, and the introduction and extinction-prone status of squamate reptiles with ranges native to the Western Hemisphere. Across >3,000 snake and lizard species (88% of known native squamates), 142 had been introduced elsewhere and 483 were extinction-prone (i.e., vulnerable, endangered, critically endangered, extinct in the wild, extinct). To explain variation in status, we first tested if the same human-impacted regions in the Americas contained the native ranges of species of either status. Second, we tested for phylogenetic signal in species status. Finally, we tested the explanatory power of multiple trait continua. The native ranges of introduced and extinction-prone reptiles were clustered in island regions with high human impact vs. mainland regions with lower human impact. Phylogenetic signal was weak for status, but introduced and extinction-prone species were clustered in different clades. All geographic and ecological traits that explained each status supported the opposite ends hypothesis. Introduced species had larger, edgier ranges, while extinction-prone species had smaller, simpler ranges. Introduced species were mostly herbivorous/omnivorous, while extinction-prone species were mostly carnivorous. Introduced species produced larger clutches, while extinction-prone species had smaller body sizes. In the Anthropocene, the naive ranges of introduced and extinction-prone species are in the same human-impacted regions where trait continua, having opposite effects, determine whether species ranges expand or contract in the continuing face of global change.

README: Elevated human impact on islands increases the introduction and extinction status of native insular reptiles

https://doi.org/10.5061/dryad.qjq2bvqqc

Files

  1. JesseEcography2024WestHemiSquamatePhylogeny.nwk - Newick format phylogeny of Western Hemisphere squamates
  2. JesseEcography2024WestHemiSquamateVariables.csv - comma delimited file of the derived variables used in the study.

Metadata

The variables in JesseEcography2024WestHemiSquamateVariables.csv are

  1. Tip_labels
    • Description: Unique identifier for each species in the phylogeny.
    • Type: Categorical (string)
    • Example values: Abronia_anzuetoi, Abronia_aurita
  2. Genus
    • Description: Genus name of the species.
    • Type: Categorical (string)
    • Example values: Abronia
  3. Species
    • Description: Full species name including genus and specific epithet.
    • Type: Categorical (string)
    • Example values: Abronia anzuetoi, Abronia aurita
  4. Stem_age
    • Description: The stem age of the genus, indicating the time since the most recent common ancestor.
    • Type: Numeric (float)
    • Range: 0.003346 - 174.429250
  5. manual_category_merged
    • Description: IUCN threat category
    • Type: Categorical (string)
    • Example values: VU (Vulnerable), EN (Endangered), CR (Critically Endangered)
  6. threat_bin1
    • Description: Binary variable indicating if the species is considered threatened (1) or not (0).
    • Type: Numeric (integer)
    • Range: 0 - 1
  7. Introduced_bin
    • Description: Binary variable indicating if the species is introduced (1) or not (0).
    • Type: Numeric (integer)
    • Range: 0 - 1
  8. area
    • Description: Native range size of the species in square kilometers.
    • Type: Numeric (float)
    • Range: 0.001135 - 19569.164493
  9. norm.perimeter
    • Description: Normalized perimeter of the species' range, indicating range shape (compactness versus edginess).
    • Type: Numeric (float)
    • Range: -0.991804 - 5.223306
  10. Insularity_cont
    • Description: Portion of the species range located on oceanic islands.
    • Type: Numeric (float)
    • Range: 0.0 - 1.0
  11. area_evo
    • Description: Evolutionary range expansion rate of the genus.
    • Type: Numeric (float)
    • Range: 1011.187003 - 2.217933e+10
  12. PC1
    • Description: First principal component from PCA on climatic variables, aligned with climatic seasonality.
    • Type: Numeric (float)
    • Range: -4.379105 - 4.528202
  13. PC2
    • Description: Second principal component from PCA on climatic variables, aligned with elevation-derived variables.
    • Type: Numeric (float)
    • Range: -2.396485 - 4.424098
  14. corrected_SD
    • Description: Standard deviation of climatic variability within the species range, adjusted for range size.
    • Type: Numeric (float)
    • Range: -0.795953 - 6.494254
  15. parity
    • Description: Binary variable indicating reproductive mode, with 1 for viviparous and 0 for oviparous.
    • Type: Numeric (integer)
    • Range: 0 - 1
  16. diet
    • Description: Dietary category of the species (Carnivorous, Herbivorous, Omnivorous).
    • Type: Categorical (string)
    • Example values: Carnivorous, Omnivorous
  17. log_length_max
    • Description: Natural log-transformed maximum body length of the species.
    • Type: Numeric (float)
    • Range: 1.171183 - 4.465908
  18. log_clutch_size
    • Description: Natural log-transformed clutch size of the species.
    • Type: Numeric (float)
    • Range: 0.000000 - 2.484907
  19. worldports
    • Description: Number of sea ports within the species' native range.
    • Type: Numeric (float)
    • Range: 0.0 - 49.0
  20. HFP_median
    • Description: Median human footprint index within the species' range, indicating the level of human impact.
    • Type: Numeric (float)
    • Range: 0.0 - 49.999996

Missing data code: NA

Funding

Dutch Research Council