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Environmental context and differences between native and invasive observed niches of Batrachochytrium salamandrivorans affect invasion risk assessments in the Western Palaearctic

(2018) DIVERSITY AND DISTRIBUTIONS. 24(12). p.1788-1801
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Abstract
Aim: Identifying hosts and regions susceptible to invasion by an emerged pathogen is vital to inform early risk assessments. We here show how differences between a pathogen's native and invasive observed niche and their underlying environments affect this process, using the recent emergence of Batrachochytrium salamandrivorans (Bsal) as a critical, empirical example. Location: Palaearctic. Methods: To quantify observed niches, we first gathered occurrences from the native Asian and invasive European distribution of Bsal. Through ordination in PCA-bound environmental space, we then applied overlap tests to compare native and invasive Bsal niches with those of 56 putative Western Palaearctic host species. At last, we ensembled bivariate niche models (ESMs) for each Bsal niche to assess how differences in observed niches influenced suitability predictions. Results: The observed invasive Bsal niche is a conservative, partially filled subset of its wider native niche. Pathogen-host overlap measured using the narrow invasive niche was nevertheless found to be significantly higher than that of the native niche, which is partly situated in subtropical conditions absent from the Western Palaearctic. ESMs created using the native niche predict high suitability for Bsal throughout Europe. Conversely, a more restricted range was predicted using the invasive niche, which coincides with the presence of oceanic climates in north-western Europe and several Mediterranean mountain ranges. Main conclusions: Unequal relative availability of environments in native and invasive ranges may lead to underestimation of observed niche overlap between native pathogen populations and putative hosts in the invasive range. The existence of partially filled niches may add uncertainty to overlap measurements, and predictions of potential further spread. Results based on the invasive niche therefore provide a conservative estimate; yet demonstrate, in our case, that Bsal is already present in conditions shared by numerous host species. Further niche filling may accordingly increase risk of salamander diversity across the Western Palaearctic.
Keywords
biological invasion, chytrid, emerging infectious disease, partial niche filling, salamander, DISTRIBUTION MODELS, CHYTRID FUNGUS, DISEASE, DISTRIBUTIONS, MAXENT, DENDROBATIDIS, EPIDEMIOLOGY, BIODIVERSITY, PERFORMANCE, DYNAMICS

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Citation

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Chicago
Beukema, Wouter, An Martel, Tao Thien Nguyen, Koichi Goka, Dirk S. Schmeller, Zhiyong Yuan, Alexandra Laking, et al. 2018. “Environmental Context and Differences Between Native and Invasive Observed Niches of Batrachochytrium Salamandrivorans Affect Invasion Risk Assessments in the Western Palaearctic.” Diversity and Distributions 24 (12): 1788–1801.
APA
Beukema, W., Martel, A., Nguyen, T. T., Goka, K., Schmeller, D. S., Yuan, Z., Laking, A., et al. (2018). Environmental context and differences between native and invasive observed niches of Batrachochytrium salamandrivorans affect invasion risk assessments in the Western Palaearctic. DIVERSITY AND DISTRIBUTIONS, 24(12), 1788–1801.
Vancouver
1.
Beukema W, Martel A, Nguyen TT, Goka K, Schmeller DS, Yuan Z, et al. Environmental context and differences between native and invasive observed niches of Batrachochytrium salamandrivorans affect invasion risk assessments in the Western Palaearctic. DIVERSITY AND DISTRIBUTIONS. 2018;24(12):1788–801.
MLA
Beukema, Wouter et al. “Environmental Context and Differences Between Native and Invasive Observed Niches of Batrachochytrium Salamandrivorans Affect Invasion Risk Assessments in the Western Palaearctic.” DIVERSITY AND DISTRIBUTIONS 24.12 (2018): 1788–1801. Print.
@article{8589825,
  abstract     = {Aim: Identifying hosts and regions susceptible to invasion by an emerged pathogen is vital to inform early risk assessments. We here show how differences between a pathogen's native and invasive observed niche and their underlying environments affect this process, using the recent emergence of Batrachochytrium salamandrivorans (Bsal) as a critical, empirical example.
Location: Palaearctic.
Methods: To quantify observed niches, we first gathered occurrences from the native Asian and invasive European distribution of Bsal. Through ordination in PCA-bound environmental space, we then applied overlap tests to compare native and invasive Bsal niches with those of 56 putative Western Palaearctic host species. At last, we ensembled bivariate niche models (ESMs) for each Bsal niche to assess how differences in observed niches influenced suitability predictions.
Results: The observed invasive Bsal niche is a conservative, partially filled subset of its wider native niche. Pathogen-host overlap measured using the narrow invasive niche was nevertheless found to be significantly higher than that of the native niche, which is partly situated in subtropical conditions absent from the Western Palaearctic. ESMs created using the native niche predict high suitability for Bsal throughout Europe. Conversely, a more restricted range was predicted using the invasive niche, which coincides with the presence of oceanic climates in north-western Europe and several Mediterranean mountain ranges.
Main conclusions: Unequal relative availability of environments in native and invasive ranges may lead to underestimation of observed niche overlap between native pathogen populations and putative hosts in the invasive range. The existence of partially filled niches may add uncertainty to overlap measurements, and predictions of potential further spread. Results based on the invasive niche therefore provide a conservative estimate; yet demonstrate, in our case, that Bsal is already present in conditions shared by numerous host species. Further niche filling may accordingly increase risk of salamander diversity across the Western Palaearctic.},
  author       = {Beukema, Wouter and Martel, An and Nguyen, Tao Thien and Goka, Koichi and Schmeller, Dirk S. and Yuan, Zhiyong and Laking, Alexandra and Nguyen, Truong Quang and Lin, Chun-Fu and Shelton, Jennifer and Loyau, Adeline and Pasmans, Frank},
  issn         = {1366-9516},
  journal      = {DIVERSITY AND DISTRIBUTIONS},
  keywords     = {biological invasion,chytrid,emerging infectious disease,partial niche filling,salamander,DISTRIBUTION MODELS,CHYTRID FUNGUS,DISEASE,DISTRIBUTIONS,MAXENT,DENDROBATIDIS,EPIDEMIOLOGY,BIODIVERSITY,PERFORMANCE,DYNAMICS},
  language     = {eng},
  number       = {12},
  pages        = {1788--1801},
  title        = {Environmental context and differences between native and invasive observed niches of Batrachochytrium salamandrivorans affect invasion risk assessments in the Western Palaearctic},
  url          = {http://dx.doi.org/10.1111/ddi.12795},
  volume       = {24},
  year         = {2018},
}

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