Clonal spread of invasive Ludwigia hexapetala and L. grandiflora in freshwater wetlands of California

Okada, Miki; Grewell, Brenda J.; Jasieniuk, Marie

doi:10.1016/j.aquabot.2009.03.006

Cited by 65 publications

(58 citation statements)

References 52 publications

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“…Offspring that were integrated with their parents did have more leaves and increased lateral growth (branching) that could improve light capture for photosynthesis (Richards and Lee, 1986). They also had more rooting nodes and higher total biomass; both of which provide fitness benefits, as abundant fragments with rooting nodes can lead to establishment of newly dispersed, colonizing ramets (Okada et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

“…Introduced as an ornamental plant, it has long been an invasive species in France, and more recently it has invaded watersheds elsewhere in Europe and in the United States (Thouvenot et al, 2013b). The primary mode of spread is hydrochorous dispersal of floating asexual shoot fragments, although the species also reproduces sexually via buoyant fruit capsules with viable seeds (Okada et al, 2009). Dispersal of rhizome fragments by hydrochory following bank erosion events is also possible, but not common.…”

Section: Introductionmentioning

confidence: 99%

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Clonal integration in Ludwigia hexapetala under different light regimes

et al. 2015

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a b s t r a c tPhysiological integration among ramets of invasive plant species may support their colonization and spread in novel aquatic environments where growth-limiting resources are spatially heterogeneous. Under contrasting light conditions, we investigated how clonal integration influences growth, biomass allocation and morphology of Ludwigia hexapetala, an emergent floating-leaved macrophyte that is highly invasive in a range of wetland habitat types. In aquatic mesocosms, stolons of offspring ramets were either connected or severed from parent plants, with the pairs exposed to homogenous or heterogeneous combinations of sun or 85% shade. Morphological traits of all ramets were strongly influenced by light environment, and low light availability decreased plant growth, regardless of integration status. Allocation patterns varied with light regime; shaded plants increased allocation to leaf biomass while sun plants allocated more resources to belowground growth. Offspring ramets integrated with parents produced more biomass, suggesting a fitness advantage through integration. However, parent ramet performance declined with stoloniferous integration; integrated parents produced fewer ramets and allocated more resources to belowground biomass. For most response variables measured, there was no significant interactive effect between light treatment and integration, although parents growing in the shade attached to an offspring in the sun increased root mass ratio. The ability to establish and spread into new environments is a key trait of invasive plants, and physiological integration of resources may improve the establishment of juvenile ramets across variable light environments during early colonization. Physiological integration in patchy light environments may contribute to the invasiveness of L. hexapetala.Published by Elsevier B.V.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clonal integration in Ludwigia hexapetala under different light regimes

et al. 2015

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“…The capacity of these small fragments to disperse, survive, and grow is a major factor in the spread of clonal plants (Klimeš et al 1997;Barrat-Segretain and Bornette 2000). Establishment of small fragments is particularly important in the spread of aquatic and marine clonal species, including species of introduced, invasive plants and algae (Wright and Davis 2006;Jia et al 2009;Okada et al 2009). Understanding what determines the survival and growth of small clonal fragments is thus of both scientific and practical interest.…”

Section: Introductionmentioning

confidence: 98%

Effects of fragmentation on the survival and growth of the invasive, clonal plant Alternanthera philoxeroides

et al. 2011

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The capacity of small clonal fragments to survive and grow is a major factor in the spread of clonal plants, especially aquatic species. This study of the introduced, invasive, amphibious, stoloniferous herb Alternanthera philoxeroides in China tested the effects of fragment size, of loss of the stolon apex, and of the original position of a fragment within a clone before fragmentation on the survival and growth of fragments in a greenhouse experiment. The stolon internodes of plants consisting of one stolon with 5 ramets were severed in all 16 possible patterns, generating fragments of 1-5 ramets. These 16 fragmentation treatments were crossed with removal of the stolon apex. Fragmentation and apex removal did not affect total growth of plants, but more highly fragmented plants produced smaller, more numerous ramets. The survival of fragments consisting of one original ramet was about 85%, compared to 100% survival of fragments with 5 original ramets. Fragments consisting of the youngest ramets along the original stolon grew more than fragments of the same size that consisted of older ramets. These effects of fragmentation on growth provide new evidence for clonal integration of the rate at which connected ramets produce new ramets and novel evidence that fragments produced from different portions of clones have different potential for spread. They further suggest that detachment of small groups of distal ramets along stolons in the field might be very effective in spreading the species and that a trade-off between the number and the size of new ramets produced by fragments may represent an adaptive, plastic response to disturbance. Results do not recommend intentional fragmentation of clones as a means of controlling the rate of growth of this invasive species but suggest that incidental fragmentation may not increase its growth in mass, although it may increase its rate of spread.

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“…Oligospermum, family Onagraceae), is an invasive aquatic plant in California freshwater wetlands (Wagner et al 2007;Okada et al 2009;Hoch and Grewell 2011). Once established, the rapid growth of L. hexapetala readily dominates native vegetation (Fig.…”

Section: Introductionmentioning

confidence: 99%

Volatile emissions from the flea beetle Altica litigata (Coleoptera: Chrysomelidae) associated with invasive Ludwigia hexapetala

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et al. 2011

Chemoecology

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The flea beetle Altica litigata (Chrysomelidae) is an insect herbivore to plants within the families Lythraceae and Onagraceae, including ornamentals such as crape myrtle, Lagerstroemia spp. This insect is important both as a pest species and as a naturally occurring biological control agent due to its aggregate feeding behavior, which typically results in severe defoliation of the host plant. Despite the negative economic impact to ornamentals and contrary benefits as a biological control agent, there are few reports on the semiochemical communication of this family of insects. Uruguayan primrose-willow (Ludwigia hexapetala) is an invasive aquatic weed in California and serves as a host to A. litigata. To better characterize this association, the volatile emissions of A. litigata were collected while the flea beetles were: in containers by themselves, in containers with L. hexapetala leaves, in situ on L. hexapetala leaves in a growth chamber, and in situ on L. hexapetala leaves in the field. For comparison, the volatile emissions of A. litigata associated with two subspecies of creeping water primrose (L. peploides) were also evaluated. Two himachalene-type sesquiterpenes, showing the same carbon skeleton as compounds previously reported from Aphthona flava and Epitrix fuscula, were detected as volatiles from A. litigata.

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Clonal spread of invasive Ludwigia hexapetala and L. grandiflora in freshwater wetlands of California

Cited by 65 publications

References 52 publications

Clonal integration in Ludwigia hexapetala under different light regimes

Clonal integration in Ludwigia hexapetala under different light regimes

Effects of fragmentation on the survival and growth of the invasive, clonal plant Alternanthera philoxeroides

Volatile emissions from the flea beetle Altica litigata (Coleoptera: Chrysomelidae) associated with invasive Ludwigia hexapetala

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