Interaction between invasive and potentially invasive shrub species does not influence relationships between their ecological success and distance from propagule sources

Dyderski, Marcin K.; Banaszczak, Piotr; Rawlik, Mateusz; Jagodziński, Andrzej M.

doi:10.1007/s11258-017-0740-z

Cited by 4 publications

(7 citation statements)

References 65 publications

(103 reference statements)

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“…Such non‐native invasive tree species have established extensive stands (henceforth referred to as “timber stands”) during the past century (Arasumani et al, 2019 ; Hulme et al, 2013 ), posing serious threats to native ecosystems (Hejda et al, 2017 ). Apart from their negative impacts on native regeneration (Dyderski et al, 2017 ), studies from low‐elevation ecosystems show that timber stands can also display signs of a heterospecific invasion (Kuebbing & Nuñez, 2015 ; Tecco et al, 2007 ), particularly in the understory. Studies from mountains on such invasions followed by changes in ecological circumstances by a primary invader are few (Giantomasi et al, 2008 ) and, thus, warrant further exploration.…”

Section: Introductionmentioning

confidence: 99%

“…Invasive trees introduced in grassland–forest mosaics in high‐altitude mountains (Arasumani et al, 2019 ; Hulme et al, 2013 ) impact biodiversity, water, and soil systems with their invasion into grasslands (Simberloff, 2011 ; van Wilgen & Richardson, 2014 ). Timber stands can alter their local habitat, and these effects get multiplied due to their size and longevity (Dyderski et al, 2017 ; Le Maitre et al, 2011 ). Their presence and influence may also facilitate the invasion of other non‐natives, especially in the understory (Kuebbing & Nuñez, 2015 ; O'Loughlin & Green, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

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Patterns of understory invasion in invasive timber stands of a tropical sky island

Jobin

Das

Harikrishnan

et al. 2023

Ecology and Evolution

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Current climate and land cover change threaten global mountaintops with increased spread of invasive species. Long‐established plantations of invasive trees on these mountaintops can alter their surroundings, further increasing invader‐facilitated invasion. Identifying the ecological conditions promoting such associations can help develop better management interventions. The Western Ghats's Shola Sky Islands (>1400 m MSL) host vast stretches of invasive tree plantations that sustain the colonization of other invasive woody, herbaceous, and fern species in their understories. Here, we analyzed vegetation and landscape variables from 232 systematically placed plots in randomly selected grids using non‐metric multidimensional scaling and Phi coefficient approaches to examine patterns of association (positive interactions) between understory invasive species with specific invasive overstory species. We also conducted GLMM with zero inflation to determine the influence of environmental variables where such associations occur. We find that understory invasion of multiple species under the canopy of other invasives is widespread across the Shola Sky Islands. Stands of Eucalyptus host the colonization of 70% of non‐native invasive species surveyed across the Shola Sky Islands. In particular, the Lantana camara invasion is strongly associated with Eucalyptus stands. We also found that climatic variables affect the colonization of understory woody invasive species, while invasion by exotic herbaceous species is associated with the density of road networks. Canopy cover impacts all invasives negatively, while fire incidence was negatively associated with invasion by Lantana spp. and the Pteridium spp. While the restoration of natural habitats primarily targets the highly invasive Acacia , less invasive Eucalyptus and Pinus are often not included. Our study suggests that retaining such invasive species in natural habitats, particularly protected areas, can hinder ongoing grassland restoration efforts by facilitating further invasions by multiple woody and herbaceous species.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Patterns of understory invasion in invasive timber stands of a tropical sky island

Jobin

Das

Harikrishnan

et al. 2023

Ecology and Evolution

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“…Exotic invasive tree species have established extensive stands across several tropical mountaintops, or sky islands, during the past century (Arasumani et al, 2019; Hulme et al, 2013) posing serious threats to native ecosystems (Hejda et al, 2017). Apart from their negative impacts on native regeneration (Dyderski et al, 2017), studies from low-elevation ecosystems show that invasive tree stands can also display signs of heterospecific invasion (Kuebbing & Nuñez, 2015; Tecco et al, 2007). Studies on such invader-facilitated invasion or secondary invasion from mountains are few (Giantomasi et al, 2008) and, thus, warrant further exploration.…”

Section: Introductionmentioning

confidence: 99%

“…Some non-native trees that were introduced in grassland-forest mosaics in high-altitude mountains (Arasumani et al, 2019; Hulme et al, 2013) impact biodiversity, water and soil systems with their expansion into grasslands (Simberloff, 2011; van Wilgen & Richardson, 2014). Plantations of non-native tree species can alter their local habitat, and these effects get multiplied due to their size and longevity (Dyderski et al, 2017; Le Maitre et al, 2011). Their presence and influence may also facilitate the invasion of other non-natives (Kuebbing & Nuñez, 2015; O’Loughlin & Green, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Their presence and influence may also facilitate the invasion of other non-natives (Kuebbing & Nuñez, 2015; O’Loughlin & Green, 2018). Such understory invasives can have cascading impacts by competing with natural forest regeneration (Dyderski et al, 2017; Vacek et al, 2020), impacting animal movements (Habel et al, 2016; Stewart et al, 2021) and enhancing edge effects (McDonald & Urban, 2006). Mapping such invasions at a landscape level becomes imperative to understand if particular overstory exotic and invasive species are associated with specific secondary invasive species in their understory.…”

Section: Introductionmentioning

confidence: 99%

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Patterns of secondary invasion in the understory of exotic, invasive timber stands

Jobin

Das

Harikrishnan

et al. 2022

Preprint

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Current climate and land cover change threaten global mountaintops with the increased spread of invasive species. Long-established plantations of exotic and invasive trees on these mountaintops can alter their surroundings, further increasing invader-facilitated or secondary invasion. Identifying the ecological conditions that promote such specific associations can help develop better management interventions. The Western Ghats's Shola Sky Islands (>1400m MSL) host vast stretches of exotic and invasive tree plantations that sustain the colonisation of other invasive woody, herbaceous and fern species in their understories. Here we analysed vegetation and landscape variables from 232 systematically-placed plots in randomly selected grids using NMDS and Phi Coefficient approaches to examine patterns of association (positive interactions) between secondary understory invasive species with specific exotic and invasive overstory species. We also conducted GLMM with zero inflation to determine the influence of environmental variables where such associations occur. We find that secondary invasion of multiple species under the canopy of other exotic invasives is widespread across the Shola Sky Islands. Stands of Eucalyptus host the colonisation of 70% of non-native invasive species surveyed across the Shola Sky Islands. In particular, the Lantana camara invasion is strongly associated with Eucalyptus stands. We also found that climatic variables affect the colonisation of understorey woody invasive species, while invasion by exotic herbaceous species is associated with the density of road networks. Canopy cover impacts all invasives negatively, while fire incidence was negatively associated with invasion by Lantana spp and the Pteridium spp. While the restoration of natural habitats largely targets the highly invasive Acacia, less invasive Eucalyptus and Pine are often not included. Our study suggests that retaining such exotic species in natural habitats, particularly protected areas, can hinder ongoing restoration efforts by facilitating further invasions by multiple woody and herbaceous species.

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Plant species over-occupancy indicates river valleys are natural corridors for migration

Holeštová

Douda

2021

Plant Ecol

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River valleys are considered natural corridors for migration of plant species, however, there is a lack of studies con rming higher colonisation rates of plant species in these areas. We compare plant speciesrichness between ancient and recent forests, and those located in a river valley with those located in the surrounding landscape. We hypothesise that, close to a river, higher plant species-richness will be associated with recent forests thus indicating a higher colonisation rate. The study area includes part of the Elbe River Valley and its surrounding landscape in the Czech Republic. We sampled an equal number of recent and ancient forests but lying at different distances from the river. We used generalised linear models to test the effect of distance from the river in dependence upon forest continuity (recent/ancient forest) on two plant species-richness categories, i.e. richness of forest species and overall species richness. In the surrounding landscape, higher richness of forest species was associated with ancient forests, whereas overall species richness was comparable. In the river valley, richness of forest species as well as overall species richness was higher in the recent forests. Recent forests in the river valley were more saturated by plant species than those in the surrounding landscape, indicating that in the river valley the colonisation rate of plant species is higher. These results con rm the importance of river valleys as natural corridors for migration of plant species.

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Interaction between invasive and potentially invasive shrub species does not influence relationships between their ecological success and distance from propagule sources

Cited by 4 publications

References 65 publications

Patterns of understory invasion in invasive timber stands of a tropical sky island

Patterns of understory invasion in invasive timber stands of a tropical sky island

Patterns of secondary invasion in the understory of exotic, invasive timber stands

Plant species over-occupancy indicates river valleys are natural corridors for migration

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