Impact of an invader on species diversity is stronger in the non-native range than in the native range

Ledger, Kimberly J.; Pál, Róbert W.; Murphy, Patrick B.; Nagy, Dávid U.; Filep, Rita; Callaway, Ragan M.

doi:10.1007/s11258-015-0508-2

Cited by 33 publications

(30 citation statements)

References 57 publications

(63 reference statements)

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“…Considering such comparison, it is possible to denote the impact intensity. The application of this approach to terrestrial plant communities has indicated that invasive species may lead to reduced diversity in the introduced range in relation to native ranges (Hejda, ; Kaur et al, ; Ledger et al, ; Nielsen et al, ; Shah et al, ). In our study, the use of data from the native range of E. crassipes as a control enabled to demonstrate that these potential impacts are related to the invasion process and are not recorded in the native area.…”

Section: Discussionmentioning

confidence: 99%

“…This approach helps testing the frequently accepted (but poorly tested) hypothesis that introduced species promote greater impacts in the introduced range rather than the native one. There are indeed studies showing a more negative impact of invasive terrestrial plants on different aspects of diversity and assemblage composition in their introduced range rather than in their native one (Chen et al, ; Hejda, ; Ledger et al, ; Nielsen, Grøndahl, Callaway, Dickinson, & Ehlers, ; Taylor, Maxwell, Pauchard, Nuñez, & Rew, ). However, to the best of our knowledge, studies on highly invasive aquatic plants are yet to compare communities in native and introduced ranges.…”

Section: Introductionmentioning

confidence: 99%

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Negative correlations between native macrophyte diversity and water hyacinth abundance are stronger in its introduced than in its native range

Lolis

Alves

Fan

et al. 2020

Diversity and Distributions

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Aim:We tested the hypothesis that the diversity and abundance of aquatic macrophytes are negatively related with Eichhornia crassipes abundance in its introduced range, but not in its native range.Location: Upper Paraná River Floodplain, Brazil and Southeast China. Methods:We sampled aquatic macrophytes patches in Brazil (native range) andChina (introduced range) along a biomass gradient of E. crassipes. For each patch, we obtained values of species richness and aquatic macrophytes percentage cover, as response variables in regression models. We also used species accumulation curves to quantify the total plot diversity in dominated and non-dominated plots for both countries. Finally, we compared the influence of E. crassipes dominance on community composition and beta diversity with Permanova and Permdisp, respectively. Results:The regression analyses revealed a negative correlation between macrophyte richness and cover and E. crassipes biomass only in the introduced range. The cumulative number of species decreased at a higher extent in plots dominated by E. crassipes in China, compared with Brazil. Also, species composition changed and beta diversity decreased in the dominated plots in China, but not in Brazil. Main Conclusions:The reduction of all diversity attributes related to E. crassipes probably results from its engineer species role, which decreases littoral region habitat heterogeneity and affects rare species in the introduced range. Differences between countries may be associated with impacts of water hyacinth on native macrophytes as this plant grows very fast and is highly competitive. Although less probable, biotic resistance at the establishment phase of water hyacinth in sites with higher number of native species is also a possibility. Regardless of the main mechanism explaining our patterns, it is suggested that invasion by water hyacinth is a cause for concern for its higher impacts in the introduced ranges than the native ranges. | 243LOLIS et aL.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Negative correlations between native macrophyte diversity and water hyacinth abundance are stronger in its introduced than in its native range

Lolis

Alves

Fan

et al. 2020

Diversity and Distributions

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“…, Ledger et al. ). Such community‐level impacts of native dominants can be comparable to those of invasive species (Hejda et al.…”

Section: Introductionmentioning

confidence: 99%

Impacts of dominant plant species on trait composition of communities: comparison between the native and invaded ranges

et al. 2019

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Most studies on the impacts of plant invasions focus on species richness or diversity of invaded communities, but much less attention has been paid to structural changes such as the representation of species with different traits. To bridge this knowledge gap, we assess the impact of dominant species on the trait composition of recipient communities (i.e., how species with certain height, seed mass, specific leaf area, clonality, and life form are represented in the vegetation plots sampled). We sampled vegetation that comprised three species native to Eurasia and invasive in North America (i.e., Agrostis capillaris, Bromus tectorum, and Cirsium arvense) and three species native to North America and invasive in Europe (i.e., Aster novi‐belgii, Lupinus polyphyllus, and Solidago canadensis), in both their native and invaded ranges. This study system based on reciprocal inter‐continental invasions allowed us to assess whether the impact on trait composition differed (1) between the native and invaded ranges and (2) between the two continents. The relationships between species’ dominance and trait composition were tested using linear mixed‐effect models and ordination methods. A general trend was that dominant species with an impact on species richness also had an impact on trait composition, especially in North America, where even the native dominants affected the trait composition of the community. Further, the impact of Eurasian dominants in North America was stronger than that associated with the opposite direction of invasion, due to a strong negative effect of Eurasian invaders on local tall clonal perennials. Our results show that (1) the traits of species in the invaded community co‐determine the impact of invasion and are related to the impacts on species richness and composition; (2) the impacts on trait composition differ between the native and invaded ranges; and (3) the direction of invasion affects the impact on trait composition.

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“…Nonnative species often show higher field performance in their nonnative than in their native ranges (Vil a et al 2011, Shah et al 2014, Ledger et al 2015, Davis et al 2018. This biogeographic phenomenon can be caused by altered abiotic conditions and biotic interactions in nonnative ranges (Mitchell et al 2006), such as release from specific antagonists present in the native range (Keane and Crawley 2002).…”

Section: Introductionmentioning

confidence: 99%

Climate outweighs native vs. nonnative range‐effects for genetics and common garden performance of a cosmopolitan weed

Rosche

Hensen

Schaar

et al. 2019

Ecological Monographs

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Comparing genetic diversity, genetic differentiation, and performance between native and nonnative populations has advanced our knowledge of contemporary evolution and its ecological consequences. However, such between‐range comparisons can be complicated by high among‐population variation within native and nonnative ranges. For example, native vs. nonnative comparisons between small and non‐representative subsets of populations for species with very large distributions have the potential to mislead because they may not sufficiently account for within‐range adaptation to climatic conditions, and demographic history that may lead to non‐adaptive evolution. We used the cosmopolitan weed Conyza canadensis to study the interplay of adaptive and demographic processes across, to our knowledge, the broadest climatic gradient yet investigated in this context. To examine the distribution of genetic diversity, we genotyped 26 native and 26 nonnative populations at 12 microsatellite loci. Furthermore, we recorded performance traits for 12 native and 13 nonnative populations in the field and in the common garden. To analyze how performance was related to range and/or climate, we fit pedigree mixed‐effects models. These models weighed the population random effect for co‐ancestry to account for the influence of demographic history on phenotypic among‐population differentiation. Genetic diversity was very low, selfing rates were very high, and both were comparable between native and nonnative ranges. Nonnative populations out‐performed native populations in the field. However, our most salient result was that both neutral genetic differentiation and common garden performance were far more correlated with the climatic conditions from which populations originated than native vs. nonnative range affiliation. Including co‐ancestry of our populations in our models greatly increased explained variance and our ability to detect significant main effects for among‐population variation in performance. High propagule pressure and high selfing rates, in concert with the ability to adapt rapidly to climatic gradients, may have facilitated the global success of this weed. Neither native nor nonnative populations were homogeneous groups but responded comparably to similar environments in each range. We suggest that studies of contemporary evolution should consider widely distributed and genotyped populations to disentangle native vs. nonnative range effects from varying adaptive processes within ranges and from potentially confounding effects of demographic history.

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Impact of an invader on species diversity is stronger in the non-native range than in the native range

Cited by 33 publications

References 57 publications

Negative correlations between native macrophyte diversity and water hyacinth abundance are stronger in its introduced than in its native range

Negative correlations between native macrophyte diversity and water hyacinth abundance are stronger in its introduced than in its native range

Impacts of dominant plant species on trait composition of communities: comparison between the native and invaded ranges

Climate outweighs native vs. nonnative range‐effects for genetics and common garden performance of a cosmopolitan weed

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