Contagious seed dispersal and the spread of avian-dispersed exotic plants

Bonilla, N. Omar; Pringle, Elizabeth G.

doi:10.1007/s10530-015-0966-4

Cited by 16 publications

(9 citation statements)

References 42 publications

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“…The direct effect of ‘ōhi‘a tree dbh on native woody understory cover (Fig. ) may be due to older trees having had more time to facilitate understory and/or larger trees attracting more birds and leading to a disproportionate quantity of seed rain relative to smaller trees (Duncan & Chapman ; Bonilla & Pringle ). That native understory was greatest closest to the base of the tree suggests that understory accumulates over time as seed rain and litter effects move outward.…”

Section: Discussionmentioning

confidence: 99%

Linking dominant Hawaiian tree species to understory development in recovering pastures via impacts on soils and litter

Yelenik

2016

Restoration Ecology

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Large areas of tropical forest have been cleared and planted with exotic grass species for use as cattle pasture. These often remain persistent grasslands after grazer removal, which is problematic for restoring native forest communities. It is often hoped that remnant and/or planted trees can jump-start forest succession; however, there is little mechanistic information on how different canopy species affect community trajectories. To investigate this, I surveyed understory communities, exotic grass biomass, standing litter pools, and soil properties under two dominant canopy trees-Metrosideros polymorpha ('ōhi'a) and Acacia koa (koa)-in recovering Hawaiian forests. I then used structural equation models (SEMs) to elucidate direct and indirect effects of trees on native understory. Native understory communities developed under 'ōhi'a, which had larger standing litter pools, lower soil nitrogen, and lower exotic grass biomass than koa. This pattern was variable, potentially due to historical site differences and/or distance to intact forest. Koa, in contrast, showed little understory development. Instead, data suggest that increased soil nitrogen under koa leads to high grass biomass that stalls native recruitment. SEMs suggested that indirect effects of trees via litter and soils were as or more important than direct effects for determining native cover. It is suggested that diverse plantings which incorporate species that have high carbon to nitrogen ratios may help ameliorate the negative indirect effects of koa on natural understory regeneration.

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Section: Discussionmentioning

confidence: 99%

Linking dominant Hawaiian tree species to understory development in recovering pastures via impacts on soils and litter

Yelenik

2016

Restoration Ecology

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“…Among them, propagule pressure is the obligatory factor determining invasion success (Lonsdale 1999;Lockwood et al 2005;Vanhellemont et al 2009). Numerous studies have confirmed its importance at both large (Křivánek et al 2006;Pyšek et al 2009Pyšek et al , 2015Woziwoda et al 2014) and small spatial scales (Pairon et al 2006;Deckers et al 2008;Vanhellemont et al 2009;Jagodziński et al 2015;Bonilla and Pringle 2015). Propagule pressure seems to be a crucial driver of relationships between habitat invasibility and ecological success of invasive species.…”

Section: Introductionmentioning

confidence: 97%

Drivers of invasive tree and shrub natural regeneration in temperate forests

Dyderski

Jagodziński

2018

Biol Invasions

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We assessed drivers of ecological success along resource availability gradients for three invasive woody species: Prunus serotina Ehrh., Quercus rubra L. and Robinia pseudoacacia L. We aimed to check how much of invasion success, measured by invader biomass, is explained by propagule pressure and plant community invasibility. Using 3 years of observations from 372 study plots (100 m 2 each) in temperate forests of Wielkopolski National Park (Poland) we investigated the hierarchy of predictors and partial dependencies using the random forest method. Our study indicated that propagule pressure explained more variance in success of invaders than invasibility-describing availability of resources and competitors in understory vegetation. We also found different responses of seedlings and saplings, connected with dependence on stored carbohydrates, which decreased seedling responses to resource availability gradients. However, resource availability (light and leaf litter predictors) had greater influence than predictors describing understory vegetation. Based on importance and response strength the species studied may be arranged by decreasing requirements for soil fertility and acidity: P. serotina \ Q. rubra \ R. pseudoacacia, whereas for light requirements and competition vulnerability the order is: P. serotina [ Q. rubra [ R. pseudoacacia. However, low light requirements of R. pseudoacacia may be biased by high proportion of sprouts supplied by parental trees. Results provide guidelines for effective management of invasive woody species in forest ecosystems and describe complex interactions between factors studied on ecological success of invaders.

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“…Most studies highlight several traits responsible for effective reproduction and spread (Pyšek et al 2015;Capinha et al 2015;Bonilla and Pringle 2015), as well as growth rate or traits connected with resource acquisition (Grotkopp et al 2010;Tecco et al 2010;te Beest et al 2015). One of the most important features of invasive species concerns adaptation to new habitat conditions -enemies or levels of resources (Funk 2008;Jeschke 2014).…”

Section: Introductionmentioning

confidence: 99%

Functional traits of acquisitive invasive woody species differ from conservative invasive and native species

Dyderski¹,

Jagodziński²

2019

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One of the most important sources of invasiveness is species’ functional traits and their variability. However there are still few studies on invasive tree species traits conducted along resource gradients that allow for a comparison of acquisitive and conservative strategies. We aimed to assess the differences in trait variation among native alien conservative and alien acquisitive tree species along resource availability gradients (soil fertility and light availability) and to assess the traits variability of the species studied along resources availability gradients. Our study compared invasive tree species in Europe (Prunusserotina Ehrh. Quercusrubra L. and Robiniapseudoacacia L.) with their native competitors (Acerpseudoplatanus L. A.platanoides L. Quercuspetraea (Matt.) Liebl. and Fagussylvatica L.). The study was conducted on 1329 seedlings and saplings collected in a system of 372 study plots in W Poland. For each individual we assessed leaf stem and root mass ratios total biomass leaf area ratio specific leaf area and projected leaf area. Two invasive species (P.serotina and R.pseudoacacia) represented a more acquisitive strategy than native species – along litter pH and light availability gradients these species had higher leaf mass fraction specific leaf area and leaf area ratio. In contrast Q.rubra had the highest total biomass and root mass fraction. Alien species usually had higher coefficients of variation of studied traits. This suggests that relatively high projected leaf area as a way of filling space and outcompeting native species may be reached in two ways – biomass allocation to leaves and control of leaf morphology or by overall growth rate. High variability of invasive species traits also suggests randomness in seedling survival which similarly to the neutral theory of invasion highlights the necessity of including randomness in modelling biological invasions.

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Contagious seed dispersal and the spread of avian-dispersed exotic plants

Cited by 16 publications

References 42 publications

Linking dominant Hawaiian tree species to understory development in recovering pastures via impacts on soils and litter

Linking dominant Hawaiian tree species to understory development in recovering pastures via impacts on soils and litter

Drivers of invasive tree and shrub natural regeneration in temperate forests

Functional traits of acquisitive invasive woody species differ from conservative invasive and native species

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