Increased relative abundance of an invasive competitor for pollination, Lythrum salicaria, reduces seed number in Mimulus ringens

Flanagan, Rebecca J.; Mitchell, Randall J.; Karron, Jeffrey D.

doi:10.1007/s00442-010-1693-2

Cited by 57 publications

(37 citation statements)

References 64 publications

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“…Like other studies of competition for pollination between L. siphilitica and M. ringens (e.g., Bell et al 2005;Flanagan et al 2010Flanagan et al , 2011, we used an additive design. An additive design has both advantages and disadvantages (reviewed in Inouye 2001).…”

Section: Experimental Designmentioning

confidence: 99%

Effect of coflowering Mimulus ringens on phenotypic selection on floral traits of gynodioecious Lobelia siphilitica

WassinkErica

Caruso

2013

Botany

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Although interspecific competition for pollination is hypothesized to result in divergence in floral traits (i.e., character displacement), few studies have tested whether selection on these traits differs in the presence and absence of a competitor for pollination. We measured phenotypic selection on floral traits of Lobelia siphilitica growing in the presence and absence of Mimulus ringens, a potential competitor for pollination. Because L. siphilitica is gynodioecious, we estimated selection separately for female and hermaphrodite plants. The presence of M. ringens did not decrease seed set of L. siphilitica. However, the presence of M. ringens did affect selection on daily display size of female L. siphilitica; there was significant selection for smaller daily displays in the absence of M. ringens, but non-significant selection for larger displays in the presence of M. ringens. In addition, selection on flower color did not differ in the presence and absence of M. ringens, but did differ between female and hermaphrodite L. siphilitica. Consequently, our results suggest that the evolution of floral traits in L.siphilitica, but not the evolution of sexual dimorphism in these traits, can be affected by interactions for pollination with M. ringens.

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Section: Experimental Designmentioning

confidence: 99%

Effect of coflowering Mimulus ringens on phenotypic selection on floral traits of gynodioecious Lobelia siphilitica

WassinkErica

Caruso

2013

Botany

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“…Invasion by exotic plant species can alter floral neighborhoods by changing floral density and diversity (Lázaro and Totland 2010b). These neighborhood characteristics are known to influence pollinator foraging behavior (Muñoz and Cavieres 1996, Kunin 1997, Bosch and Waser 2001, Ghazoul 2006, Bartomeus et al 2008, Flanagan et al 2010, Yang et al 2011). Furthermore, foraging behavior in a given floral neighborhood can be contingent on pollinator identity, as pollinator groups may behave differently in the same floral environment (Stout et al 1998, Lázaro and Totland 2010a, b).…”

mentioning

confidence: 99%

Neighborhood‐contingent indirect interactions between native and exotic plants: multiple shared pollinators mediate reproductive success during invasions

Waters

Fisher

Lambers

2014

Oikos

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Native and exotic plants can influence one another's fecundity through their influence on shared pollinators. Specifically, invasion may alter abundance and composition of local floral resources, affecting pollinator visitation and ultimately causing seedset of natives in more‐invaded and less‐invaded floral neighborhoods to differ. Such pollinator‐mediated effects of exotic plants on natives are common, but native and exotic plants often share multiple pollinators, which may differ in their responses to altered floral neighborhoods. We quantified pollinator‐mediated interactions between three common forbs of western Washington prairies (native Microseris laciniata and Eriophyllum lanatum and European Hypochaeris radicata) in three floral neighborhoods: 1) high native and low exotic floral density, 2) high exotic floral density and low native density, and 3) experimentally manipulated low exotic floral density. Pollinator visitation rates varied by floral neighborhood, plant species identity, and their interaction for all three plant species. Similarly, pollinator functional groups (eusocial bees, solitary bees, and syrphid flies) contributed differing proportions of total visitation to each species depending upon neighborhood context. Consequently, in exotic neighborhoods H. radicata competed with native M. laciniata, reducing seed set, while simultaneously facilitating visitation and seed set for native E. lanatum. Seed set of H. radicata was also highest in exotic neighborhoods (with high densities of conspecifics), raising the possibility of a positive feedback between exotic abundance and success. Our results suggest that the outcome of indirect interactions between native and exotic plants depends on the density and the composition of the floral neighborhood and of the pollinator fauna, and on context‐dependent pollinator foraging.

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“…Although we found little evidence of competition between C. stoebe and H. villosa for pollinators at low relative densities of C. stoebe, we observed a trend (non-significant) of decreasing visits per flower to H. villosa with increasing density of C. stoebe, indicating that there may be competition at greater densities of C. stoebe than we tested. Other studies investigating the impact of the relative abundance of an invasive plant on pollinator visitation to a coflowering native plant have found mixed results, including facilitative, competitive and neutral interactions (Muñoz and Cavieres 2008, Flanagan et al 2010, Chung et al 2014. A meta-analysis of seven studies found an increasing negative impact on visitation to and reproduction of native plants with increasing abundance of the invasive plant (Morales and Traveset 2009).…”

Section: Discussionmentioning

confidence: 97%

“…Other studies investigating the impact of the relative abundance of an invasive plant on pollinator visitation to a co‐flowering native plant have found mixed results, including facilitative, competitive and neutral interactions (Muñoz and Cavieres , Flanagan et al. , Chung et al. ).…”

Section: Discussionmentioning

confidence: 99%

Temporal‐ and density‐dependent impacts of an invasive plant on pollinators and pollination services to a native plant

et al. 2016

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Abstract. Pollinators and pollination services are under threat globally, and invasive plants have been implicated in their decline. Results of previous studies suggest that consequences of invasion for pollinators and plant-pollinator interactions are context specific. Investigating factors such as the density of an invasive plant and its phenology may provide a nuanced understanding of invasive species impacts. We conducted a 2-yr study in Montana to investigate how local pollinator abundance, richness, community composition, and visitation patterns varied with invasive Centaura stoebe density and phenology, and whether C. stoebe altered the reproduction of a co-flowering native plant, Heterotheca villosa, through changes in pollinator visitation. In an observational study, we found that during its peak bloom in August, Centaurea stoebe provided abundant floral resources to late-season pollinators. However, prior to C. stoebe bloom, native floral density and pollinator abundance and richness of these plots were lower compared to plots where C. stoebe was low or absent. Pollinator community composition in plots without C. stoebe was different compared to plots with C. stoebe (both high and low C. stoebe density), and these differences in pollinator composition strongly depended on the time of season. In an experimental study, we found that there was little evidence of competition between C. stoebe and H. villosa for pollinators at low relative densities of C. stoebe. Using experimental pollen supplementation, we observed no evidence of pollen limitation of seed set in H. villosa with increasing density of experimentally added C. stoebe. Our results suggest that the impact of an invasive plant on pollinators and plant-pollinator interactions depends on the relative density of the invasive plant and the timing of its bloom. Differences in pollinator visitation patterns over the growing season suggest that although C. stoebe provides abundant resources to lateseason pollinators, displacement of native plants at high C. stoebe density may indirectly harm pollinators that are active before C. stoebe blooms or that prefer native plants. Based on our results, restricting C. stoebe to low densities may help mitigate negative repercussions to native plant reproduction and may even be beneficial to some pollinators.

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Increased relative abundance of an invasive competitor for pollination, Lythrum salicaria, reduces seed number in Mimulus ringens

Cited by 57 publications

References 64 publications

Effect of coflowering Mimulus ringens on phenotypic selection on floral traits of gynodioecious Lobelia siphilitica

Effect of coflowering Mimulus ringens on phenotypic selection on floral traits of gynodioecious Lobelia siphilitica

Neighborhood‐contingent indirect interactions between native and exotic plants: multiple shared pollinators mediate reproductive success during invasions

Temporal‐ and density‐dependent impacts of an invasive plant on pollinators and pollination services to a native plant

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