Abstract
ABSTRACT Questions What is the position of the two selected invasive alien species in the regional trait space? Does the probability of occurrence of a species depend on the interaction of its similarity to and the cover of the selected invasive species, Asclepias syriaca and Conyza canadensis ? Location Hungary, Kiskunság, sandy grasslands. Methods We used data from a stratified random grassland survey (plot size: 25 m 2 , n = 161). Our analysis focused on the two most common invasive species of studied habitats: clonal perennial A. syriaca and annual C. canadensis . Trait similarity between species was measured by weighted Gower distance using three sets of traits: (1) 12 traits covering all aspects of life history, (2) traits related to reproduction and (3) traits related to persistence. Calculated similarities were used to describe the position of the two focal invasive species in the trait space generated by all species. We fitted generalised mixed‐effects models with the presence/absence of all species except A. syriaca and C. canadensis as dependent variables and trait similarity to, and cover of invasive species as predictors. Results We found that both invasive species were in the trait range of the regional species pool. C. canadensis was closer to the centre of regional trait space than A. syriaca . Similarity to A. syriaca and its cover interacted to influence the occurrence of the rest of the species: Where the cover of A. syriaca was higher, similar species occurred with a higher probability. We found no such effect of similarity in the case of C. canadensis . Conclusions These results suggest that for perennial invasive species A. syriaca , trait similarity may influence the composition of co‐occurring species. In contrast, the results of annual C. canadensis suggest a more random assembly.
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Claims 5
Claim · model-written summary
Asclepias syriaca lies within the trait range of the regional species pool.
- Taxon
- Asclepias syriaca
Asclepias syriacat0 - Outcome
- trait range of the regional species poole1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Similarity in Persistence Traits Is Important for CoExistence With Perennial Invasive Asclepias syriaca but Not Annual Invasive Conyza canadensis”
e1“We found that both invasive species were in the trait range of the regional species pool”
Claim · model-written summary
Conyza canadensis lies within the trait range of the regional species pool.
- Taxon
- Conyza canadensis
Erigeron canadensist0 - Outcome
- trait range of the regional species poole1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Similarity in Persistence Traits Is Important for CoExistence With Perennial Invasive Asclepias syriaca but Not Annual Invasive Conyza canadensis”
e1“We found that both invasive species were in the trait range of the regional species pool”
Claim · model-written summary
Conyza canadensis is closer to the centre of the regional trait space than Asclepias syriaca.
- Taxon
- Conyza canadensisErigeron canadensist0
- Outcome
- closer to the centre of regional trait spacee2
- Direction
- closere2
- Comparator
- A. syriacae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Similarity in Persistence Traits Is Important for CoExistence With Perennial Invasive Asclepias syriaca but Not Annual Invasive Conyza canadensis”
e2“C. canadensis was closer to the centre of regional trait space than A. syriaca”
Claim · model-written summary
Where cover of Asclepias syriaca was higher, similar species occurred with a higher probability.
- Taxon
- Asclepias syriacaAsclepias syriacat0
- Treatment
- cover of A. syriacae3
- Outcome
- occurred with a higher probabilitye3
- Direction
- highere3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Similarity in Persistence Traits Is Important for CoExistence With Perennial Invasive Asclepias syriaca but Not Annual Invasive Conyza canadensis”
e3“Where the cover of A. syriaca was higher, similar species occurred with a higher probability”
Claim · model-written summary
Trait similarity to Conyza canadensis had no effect on the occurrence of co-occurring species.
- Taxon
- Conyza canadensisErigeron canadensist0
- Treatment
- similaritye4
- Outcome
- effect of similaritye4
- Direction
- no such effecte4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Similarity in Persistence Traits Is Important for CoExistence With Perennial Invasive Asclepias syriaca but Not Annual Invasive Conyza canadensis”
e4“We found no such effect of similarity in the case of C. canadensis”