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76 results for “native invader”

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zenodo36/100

Are rice fields less diverse and more invaded by non-native species than less impacted habitats? A test with wetland microcrustaceans

Raw data of environmental variables and microcrustacean abundance community matrix R scripts used in the study

opencc-by-4.0May 2024View details →

dryad36/100

An invasive seagrass drives its own success in two invaded seas by both negatively affecting native seagrasses and benefiting from those costs

The nature and strength of interactions between native and invasive species can determine invasion success. Species interactions can drive, prevent or facilitate invasion, making understanding the nature and outcome of these interactions critical. We conducted mesocosm experiments to test the outcome of interactions between Halophila stipulacea, a seagrass that invaded the Mediterranean and Caribbean Seas, and native seagrasses (Cymodocea nodosa and Syringodium filiforme, respectively) to elucidate mechanisms explaining the successful invasions. Mesocosms contained intact cores with species grown either mixed or alone. Overall, in both locations, there was a pattern of the invasive growing faster with the native than when alone, while also negatively affecting the native, with similar patterns for shoot density, aboveground and belowground biomass. In the Caribbean, H. stipulacea increased by 5.6 ± 1.0 SE shoots in 6 weeks when grown with the native while, when alone, there was a net loss of −0.8 ± 1.6 SE shoots. The opposite pattern occurred for S. filiforme, although these differences were not significant. While the pattern in the Mediterranean was the same as the Caribbean, with the invasive grown with the native increasing shoots more than when it grew alone, these differences for shoots were not significant. However, when measured as aboveground biomass, H. stipulacea had negative effects on the native C. nodosa. Our results suggest that a seagrass that invaded two seas may drive its own success by both negatively affecting native seagrasses and benefiting from that negative interaction. This is a novel example of a native seagrass species facilitating the success of an invasive at its own cost, providing one possible mechanism for the widespread success of this invasive species.

opencc-zeroNov 2022View details →

dryad36/100

Invader abundance and contraction of niche breadth during replacement of a native gammarid amphipod

The introduction of non-native species to new locations is a growing global phenomenon with major negative effects on native species and biodiversity. Such introductions potentially bring competitors into contact leading to partial or total species replacements. This creates an opportunity to study novel species interactions as they occur, with the potential to address the strength of inter- and intraspecific interactions, most notably competition. Such potential has often not been realized, however, due to the difficulties inherent in detecting rapid and spatially expansive species interactions under natural field conditions. The invasive amphipod crustacean Gammarus pulex has replaced a native species, Gammarus duebeni celticus, in river and lake systems across Europe. This replacement process is at least partially driven by differential parasitism, cannibalism and intraguild predation, but the role of interspecific competition has yet to be resolved. Here, we examine how abundance of an invasive species may affect spatial niche breadth of a native congeneric species. We base our analyses of niche breadth on ordination and factor analysis of biological community and physical parameters, respectively, constituting a summative, multidimensional approach to niche breadth along environmental gradients. Results derived from biological and environmental niche criteria were consistent, although interspecific effects were stronger using the biological niche approach. We show that the niche breadth of the native species is constrained as abundance of the invader increases, but the converse effect does not occur. We conclude that the interaction between invasive G. pulex and native G. d. celticus under natural conditions is consistent with strong interspecific competition whereby a native, weaker competitor is replaced by a superior invasive competitor. This study indicates a strong role of interspecific competition, alongside other known interactions such as differential intraguild predation, in rapid and expansive species replacements following biological invasions.

opencc-zeroDec 2022View details →

dryad36/100

Altered trait covariances between invasive and native ranges of a global plant invader

Increasing evidence suggests that invasive populations adapt to novel environments rapidly, and the ability to rapidly adapt depends on genetically-based trait variation and covariation. However, few studies have investigated the trait covariance in the native and invasive ranges. Such investigation will give a more comprehensive picture of how historical contingency and adaptation shape invasiveness, contributing to the prediction of future invasion dynamics. Here, we collected seven and nine populations alongside latitudes from invasive and native ranges of a global invasive plant, Spartina alterniflora, and planted them in two common gardens at the southernmost and northernmost sites of the invasive range. We measured plant traits, including the first flowering time, plant height, and seed set, and analyzed how these traits varied with garden sites and populations' origin latitudes and how their covariance changed between ranges. We found that plants flowered later, grew taller, and set more seeds in the high-latitude garden than in the low-latitude one. The growth and expression of genetic variation of traits appeared to be limited by high ambient temperature in the low-latitude garden. In the high-latitude garden, the flowering time of populations showed clinal variation for both invasive and native populations, whereas the plant height and seed set showed clinal variation only for native or invasive populations. From the native to the invasive range, the flowering time and seed set developed negative genetic covariance, and flowering time and plant height changed from negative genetically correlated to uncorrelated. Our results suggested that S. alterniflora has experienced rapid adaptation to clinal and local conditions over the 40-year invasion. Such geographic-scale rapid adaptation appeared to have benefited from previously identified genetic admixture that has released the trait covariance. Our study highlights the importance of integrating full-range geographical surveys with introduction history to understand the potential and mechanisms of trait evolution during invasion.

opencc-zeroFeb 2023View details →

zenodo36/100

Seed weight of Erodium cicutarium in its native and two invaded ranges

This dataset provides seed weights of the plant Erodium cicutarium in its native range in Germany as well as two invaded ranges, California (US) and Chile. The dataset is related to the following publication: Heger, T., Nikles, G., & Jacobs, B. S. (2018). Differentiation in native as well as introduced ranges: Germination reflects mean and variance in cover of surrounding vegetation. Aob Plants, ply009-ply009. https://doi.org/10.1093/aobpla/ply009

opencc-by-4.0Mar 2023View details →

dryad36/100