Non-naturalized alien plants receive fewer flower visits than naturalized and native plants in a Swiss botanical garden

Razanajatovo, Mialy Harindra; Föhr, Christine; Fischer, Markus; Prati, Daniel; Kleunen, Mark van

doi:10.1016/j.biocon.2014.11.043

Cited by 24 publications

(28 citation statements)

References 53 publications

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“…On the other hand, a recent study showed that alien plants that have managed to establish naturalized populations in Switzerland were better than non‐naturalized plants in attracting abundant and diverse flower visitors in a botanical garden (Razanajatovo et al . ). This suggests that pollinator limitation might prevent naturalization under certain conditions.…”

Section: Discussionmentioning

confidence: 97%

“…In line with the idea that pollen limitation may be a barrier to invasion success of alien plants, a recent study on 446 alien and native species showed that alien plants that have not managed to establish self‐sustaining populations in Switzerland attracted fewer pollinators than naturalized aliens did (Razanajatovo et al . ). However, none of these studies assessed explicitly whether the alien plant species that are able to attract more pollinators also produce more seeds.…”

Section: Introductionmentioning

confidence: 97%

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Non‐invasive naturalized alien plants were not more pollen‐limited than invasive aliens and natives in a common garden

Razanajatovo

Kleunen

2016

Functional Ecology

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Summary1. Many invasive alien plants are, in contrast to many non-invasive ones, self-compatible and autofertile and thus do not fully depend on mates and pollinators for seed production. Nevertheless, they often still depend on pollinators for maximal reproduction. Indeed, it has been shown that many invasive plants can attract pollinators in the non-native range and may attract more of them than non-invasive plants do. This suggests that many introduced alien plants may have failed to become invasive because they are pollen-limited. 2. We used an experimental approach to test whether non-invasive alien species suffer higher pollen limitation and have lower autofertility than invasive aliens and natives. In a common garden, we assessed the degree of pollen limitation and autofertility of eight confamilial (or congeneric) triplets of native, invasive and non-invasive (but naturalized) alien plant species (totalling 24 species). Our breeding-system experiment included three treatments: pollen supplementation, open pollination and pollinator exclusion. We report three measures of pollen limitation and autofertility (fruit set, seed production per fruit and indices of pollen limitation and autofertility based on seed production per flower). 3. We found that the three plant groups had low degrees of pollen limitation and were almost all autofertile to some degree. Moreover, our phylogenetically informed analyses showed that the three plant groups did not differ significantly in their degrees of pollen limitation and autofertility. 4. Our results support previous findings that alien plants are able to attract pollinators in nonnative regions. Nevertheless, because invasive and non-invasive naturalized alien species did not differ in their degrees of pollen limitation, our results suggest that pollen limitation may not play a major role in the spread of alien plants, once they have become naturalized.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Non‐invasive naturalized alien plants were not more pollen‐limited than invasive aliens and natives in a common garden

Razanajatovo

Kleunen

2016

Functional Ecology

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“…Pollinator visitation rates can influence whether populations naturalise or not (Razanajatovo et al . ). We found that visitation rates are more than three times higher in naturalised H .…”

Section: Discussionmentioning

confidence: 97%

The importance of pollinators and autonomous self‐fertilisation in the early stages of plant invasions:BanksiaandHakea(Proteaceae) as case studies

et al. 2015

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Reproduction is a crucial stage in the naturalisation of introduced plant species. Here, using breeding system experiments and observations of floral visitors, we investigate whether a lack of pollinators or an inability to autonomously self-fertilise limits naturalisation in five Australian Banksia species and the co-familial Hakea salicifolia in South Africa. Banksia species were heavily utilised by native insects and nectar-feeding birds. Although Banksia produced fruit when pollinators were excluded, pollinators significantly increased seed set in four of the five species. H. salicifolia flowers were visited by 11 insect species; honeybees (Apis mellifera) were the main visitors. Flowers in naturalised H. salicifolia populations received almost four times the number of visits as flowers in non-naturalised populations; the latter showed both pollen limitation (PLI 0.40) and partial self-incompatibility. This should not prevent invasion, since H. salicifolia produces fruits via autonomous selfing in the absence of pollinators. The results suggest a limited role of breeding systems in mediating naturalisation of introduced Proteaceae species. Other factors, such as features of the recipient environments, appear to be more important. Spatial variation in rates of reproduction might, however, explain variation in the extent and rate of naturalisation of different populations.

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“…proposed a narrower circumscription of Baker's Law focusing on the consequences of mate rather than pollinator limitation. However, in a recent study, it was shown that naturalized species might attract more floral visitors than cultivated, but non-naturalized alien species42, suggesting that pollinator limitation may be important and should not be ignored.…”

Section: Discussionmentioning

confidence: 99%

Plants capable of selfing are more likely to become naturalized

et al. 2016

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Many plant species have established self-sustaining populations outside their natural range because of human activities. Plants with selfing ability should be more likely to establish outside their historical range because they can reproduce from a single individual when mates or pollinators are not available. Here, we compile a global breeding-system database of 1,752 angiosperm species and use phylogenetic generalized linear models and path analyses to test relationships between selfing ability, life history, native range size and global naturalization status. Selfing ability is associated with annual or biennial life history and a large native range, which both positively correlate with the probability of naturalization. Path analysis suggests that a high selfing ability directly increases the number of regions where a species is naturalized. Our results provide robust evidence across flowering plants at the global scale that high selfing ability fosters alien plant naturalization both directly and indirectly.

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Non-naturalized alien plants receive fewer flower visits than naturalized and native plants in a Swiss botanical garden

Cited by 24 publications

References 53 publications

Non‐invasive naturalized alien plants were not more pollen‐limited than invasive aliens and natives in a common garden

Non‐invasive naturalized alien plants were not more pollen‐limited than invasive aliens and natives in a common garden

The importance of pollinators and autonomous self‐fertilisation in the early stages of plant invasions:BanksiaandHakea(Proteaceae) as case studies

Plants capable of selfing are more likely to become naturalized

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