Invasive and non-invasive congeneric Centaurea (Asteraceae) show contrasting patterns of herbivory by snails

Filipe, João C.; Jorge, Andreia F.; Eren, Özkan; Sotés, Gastón; Hierro, José Luis; Montesinos, Daniel

doi:10.5091/plecevo.2016.1231

Cited by 5 publications

(4 citation statements)

References 21 publications

(26 reference statements)

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“…This finding meets expectations of the SD hypothesis, an extension of the EICA hypothesis resulting from differentiating plant resistance to specialist versus generalist herbivores (Müller-Schärer et al, 2004;Joshi & Vrieling, 2005). Greater protection against generalists in C. solstitialis populations from the Caldenal than in those from Anatolia is consistent with results from feeding assays using another generalist herbivore, the garden snail Helix aspersa (Filipe et al, 2016). Additional work is needed to examine the nature of defenses (Doorduin & Vrieling, 2011) and the resistance to specialist herbivores (Zhang et al, 2018) in ancestral and non-native populations of C. solstitialis.…”

Section: Discussionsupporting

confidence: 82%

Evolution of increased competitive ability may explain dominance of introduced species in ruderal communities

Hierro

Eren

Čuda

et al. 2022

Ecological Monographs

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The evolution of increased competitive ability (EICA) hypothesis encapsulates the importance of evolution and ecology for biological invasions. According to this proposition, leaving specialist herbivores at home frees introduced plant species from investing limited resources in defense to instead use those resources for growth, selecting for individuals with reduced defense, enhanced growth, and, consequently, increased competitive ability. We took a multispecies approach, including ancestral and non-native populations of seven weeds, as well as seven coexisting local weeds, to explore all three predictions (i.e., lower defense, greater growth, and better ability to compete in non-native than ancestral populations), the generality as an invasion mechanism for a given system, and community-level consequences of EICA. We assessed plant defenses by conducting herbivory trials with a generalist herbivore. Therefore,

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Section: Discussionsupporting

confidence: 82%

Evolution of increased competitive ability may explain dominance of introduced species in ruderal communities

Hierro

Eren

Čuda

et al. 2022

Ecological Monographs

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“…It usually inhabits ruderal habitats and develops single bolting flower stems from basal rosettes. Several past studies have shown phenotypic differences between individuals from the native and nonnative regions of C. sulphurea, and between this species and the closely related, highly invasive, Centaurea solstitialis L. (Graebner et al 2012;Garcia et al 2013;Filipe et al Forthcoming). There has been no sign of interspecific hybridisation among these species.…”

Section: Introductionmentioning

confidence: 79%

Inter-regional hybrids of native and non-native Centaurea sulphurea inherit increased competitive ability from the non-natives

Filipe

Montesinos

2016

Plant Ecology & Diversity

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Background: Exotic species can rapidly develop adaptations to their non-native regions, such as increased size and competitive ability. Although these traits are believed to be responsible for invasive success, some non-invasive exotic species display them too. This suggests that increased size and competitive ability might be necessary but not sufficient to turn an exotic into a successful invader. Aim: To assess size and competitive ability of the exotic non-invasive weed Centaurea sulphurea, and of interregional hybrids between native and non-native populations. Methods: We experimentally produced a cohort of C. sulphurea individuals from the native range of the species in Spain, from its non-native range in California, as well as hybrids between the two regions. We grew these plants in pots in competition with the grass Bromus hordeaceus, or alone in control pots. Results: Individuals from California were larger and better competitors than individuals from Spain. Furthermore, interregional hybrids showed competitive responses similar to that of individuals from California. Conclusions: Our results confirm that increased competitive ability might be more frequent than previously thought among introduced species, since it can be detected in at least some exotic non-invasive species. They also illustrate the importance of maternal effects, how locally adapted traits are conserved and spread in the non-native ranges of exotic species, and suggest that plant size and competitive ability are not directly associated in this species.

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“…During its colonization history, the species had evolved many trait differences in its introduced areas, relative to the native range, such as increased seed size, germination timing and adult plant size (Graebner et al 2012, Hierro et al 2013Barker et al 2017), and increased competitive ability (Montesinos and Callaway 2017), among others. Other species in the genus were found to be allelopathic (Callaway and Aschehoug 2000;Ni et al 2010;Chen et al 2013;Aschehoug et al 2014), but previous experiments did not find evidence of root-mediated allelopathy in C. solstitialis (Carpenter 2007;Qin et al 2007); however, some studies suggest that leaf leachates may be allelopathic (Zamora 1984;Gómez-González et al 2009;Filipe et al 2016). All aerial parts of C. solstitialis possess several sesquiterpene lactones (Stevens and Merrill 1985;Alvarez 2008;Sotes et al 2015) which have well known pharmacological and biological inhibitory activity (Cheng et al 1992;Özçelik et al 2009), and that can act as an inducible chemical defense against herbivory (Beck et al 2008;Smith and Beck 2013;Oster et al 2015) or mediate competitive interactions with neighboring plants.…”

Section: Introductionmentioning

confidence: 99%

Biogeographic differences in the allelopathy of leaf surface extracts of an invasive weed

et al. 2019

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Allelopathy, the release of chemicals by plants that inhibit the germination and growth of competing species, can be an important trait for invasive success. However, little is known about potential biogeographical differences in allelopathy due to divergent regional eco-evolutionary histories. To test this, we examined the allelochemical potential of the highly invasive species Centaurea solstitialis from six world regions including native (Spain, Turkey) and non-native ranges (Argentina, Chile, California and Australia). Seeds from several populations in each region were collected and grown under common garden conditions. Allelopathic potential and chemical composition of three leaf extract concentrations of C. solstitialis from each region: 0.25%, 0.5% 0.75% (w/v−1) were assessed on the phytometer Lactuca sativa. The main allelochemicals present in the leaf-surface extract were sesquiterpene lactones that varied in major constitutive compounds across regions. These leaf extracts had strong inhibitory effects on L. sativa seed germination and net growth. Summed across regions, the 0.25% concentration suppressed germination by 72% and radicle elongation by 66%, relative to the controls. At the 0.5% concentration, no seeds germinated when exposed to extracts from the non-native ranges of Argentina and Chile, whereas germination and radicle growth were reduced by 98% and 89%, respectively, in the remaining regions, relative to controls. Germination and seedling growth were completely inhibited at the 0.75% concentration extract for all regions. Some non-native regions were characterized by relatively lower concentrations of allelochemicals, suggesting that there is biogeographical variation in allelopathic expression. These findings imply that rapid selection on the biochemical signatures of an exotic invasive plant species can be highly region-specific across the world.

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Invasive and non-invasive congeneric Centaurea (Asteraceae) show contrasting patterns of herbivory by snails

Cited by 5 publications

References 21 publications

Evolution of increased competitive ability may explain dominance of introduced species in ruderal communities

Evolution of increased competitive ability may explain dominance of introduced species in ruderal communities

Inter-regional hybrids of native and non-native Centaurea sulphurea inherit increased competitive ability from the non-natives

Biogeographic differences in the allelopathy of leaf surface extracts of an invasive weed

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