Satellite patches, patch expansion, and doubling time as decision metrics for invasion control:<i>Pennisetum ciliare</i>expansion in southwestern Arizona

Weston, Jaron D.; McClaran, Mitchel P.; Whittle, Richard K.; Black, Christian W.; Fehmi, Jeffrey S.

doi:10.1017/inp.2019.3

Cited by 4 publications

(5 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the singed stands within the postburn landscape had a small spatial footprint, taking up less than 20% of the full burn area in this experiment, and are highly visible within the burn area; therefore, we suggest that they could be a target for further restoration activities. Notably, the removal of satellite populations of the invader Pennisetum ciliare was found to reduce the doubling time of the invasion (Weston et al 2019). Selectively spraying preemergent herbicide may further reduce the potential for reinvasion (Lazarus & Germino 2022).…”

Section: Discussionmentioning

confidence: 99%

“…Systems with persistent seedbanks that contain native species experience a flush of native establishment after prescribed burns; however, non‐native species may reestablish within a few years due to surrounding propagule pressure (Dickens & Allen 2009; Alba et al 2014). The establishment of non‐native species may be accelerated if incomplete consumption results in singed stands of non‐native vegetation that still have seeds present either on the plant or in the understory, thus, forming refugia from which a plant invader can spread (Moody & Mack 1988; Weston et al 2019). These refugia combined with the high seed output of invasive species could therefore result in high cover and reinvasion of treated areas (Fenner & Thompson 2005; Colautti et al 2006).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Prescribed burning may produce refugia for invasive forb, Oncosiphon pilulifer

Schwab

Jenerette

Larios

2023

Restoration Ecology

View full text Add to dashboard Cite

Prescribed burning is a common management technique to reduce non‐native grass cover and seed availability in temperate forests and grasslands; however, its effectiveness in reducing non‐native forbs is unclear. Litter of invasive forbs like Oncosiphon pilulifer are not consumed by fire like invasive grass litter is, resulting in residual singed stands and high heterogeneity in the postburn landscape. We investigated the potential for this incomplete burning to alter postfire establishment of native and non‐native plant species by conducting a field experiment in a prescribed burn in Lake Perris State Park, CA. We investigated the role of microclimate and seed availability on establishment for 2 years following a prescribed burn in both singed stands and completely burned patches by adding or removing litter and adding native seed in a factorial design. Litter presence reduced soil temperatures and light availability, while singed stands had lower soil moisture and temperature. Litter present treatments had 5.6 ± 5.9% (mean ± SE) greater Oncosiphon cover yet doubled Oncosiphon viable seeds in the seedbank. Singed stands had 22.6 ± 4.9% greater Oncosiphon cover and more than doubled Oncosiphon viable seeds. Native seed addition did not influence native or Oncosiphon cover. These results suggest that residual singed stands within the prescribed burn landscape can create a favorable microclimate and allow Oncosiphon to retain seed, increasing reinvasion. Our experiment suggests that litter increased establishment of non‐native species as these species may better utilize postburn establishment opportunities impacting overall community recovery. Management of invasive forbs with prescribed burns may require secondary treatments to reduce reinvasion.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prescribed burning may produce refugia for invasive forb, Oncosiphon pilulifer

Schwab

Jenerette

Larios

2023

Restoration Ecology

View full text Add to dashboard Cite

show abstract

“…(b) Correlation between the perimeter:area ratio of patches and their relative expansion rate during simulations. Blackwood et al 2010, Hoffberg et al 2018, Weston et al 2019 needs to consider the mediating roles of varying patch geometries and the relative positions of patches within the landscape. While parameterizing our model framework to fit the spatial distribution of A. leptopus on St. Eustatius (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…5). These findings suggest that the ongoing debate regarding the removal of smaller or larger invasive species patches (Moody and Mack 1988, Wadsworth et al 2000, Whittle et al 2007, Blackwood et al 2010, Hoffberg et al 2018, Weston et al 2019) needs to consider the mediating roles of varying patch geometries and the relative positions of patches within the landscape.…”

Section: Discussionmentioning

confidence: 99%

“…Within an infestation, one can distinguish primary patches that were typically established early in the invasion process and have developed to a large size, and nascent satellite patches that established later and are still small (Moody and Mack 1988). Whether management strategies should focus on removing primary patches or satellite patches in the invaded range is an ongoing debate (Moody and Mack 1988, Wadsworth et al 2000, Whittle et al 2007, Blackwood et al 2010, Baker 2017, Hoffberg et al 2018, Weston et al 2019). Which removal actions comprise the most effective strategy may depend on the specific characteristics of the particular IAS, the phase of the invasion process, and the amount of available control effort considered (Liebhold and Bascompte 2003, Taylor and Hastings 2004, Epanchin‐Niell and Hastings 2010).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spatially explicit removal strategies increase the efficiency of invasive plant species control

Eppinga

Baudena

Haber

et al. 2021

Ecological Applications

View full text Add to dashboard Cite

Effective management strategies are needed to control expansion of invasive alien plant species and attenuate economic and ecological impacts. While previous theoretical studies have assessed optimal control strategies that balance economic costs and ecological benefits, less attention has been paid to the ways in which the spatial characteristics of individual patches may mediate the effectiveness of management strategies. We developed a spatially explicit cellular automaton model for invasive species spread, and compared the effectiveness of seven control strategies. These control strategies used different criteria to prioritize the removal of invasive species patches from the landscape. The different criteria were related to patch size, patch geometry, and patch position within the landscape. Effectiveness of strategies was assessed for both seed dispersing and clonally expanding plant species. We found that, for seed-dispersing species, removal of small patches and removal of patches that are isolated within the landscape comprised relatively effective control strategies. For clonally expanding species, removal of patches based on their degree of isolation and their geometrical properties comprised relatively effective control strategies. Subsequently, we parameterized the model to mimic the observed spatial distribution of the invasive species Antigonon leptopus on St. Eustatius (northern Caribbean). This species expands clonally and also disperses via seeds, and model simulations showed that removal strategies focusing on smaller patches that are more isolated in the landscape would be most effective and could increase the effectiveness of a 10-yr control strategy by 30-90%, as compared to random removal of patches. Our study emphasizes the potential for invasive plant species management to utilize recent advances in remote sensing, which enable mapping of invasive species at the high spatial resolution needed to quantify patch geometries. The presented results highlight how this spatial information can be used in the design of more effective invasive species control strategies.

show abstract

Long‐term and landscape impacts of buffel grass on arid plant communities: Ecosystem shifts and acceleration by fire

Ryan‐Colton,

French,

Wardle

et al. 2024

Ecosphere

View full text Add to dashboard Cite

Plant invasions drive biodiversity loss, transform ecosystems, and promote positive‐feedback cycles between invasion and fire. However, the long‐term impacts of invasive grasses across landscapes with diverse plant communities and interactions with fire are poorly known. Our objectives were to examine whether buffel grass (Cenchrus ciliaris), a globally significant plant invader, altered the abundance of understory and overstory plants, homogenized plant composition, and shifted ecosystems from woodlands to grassland and to explore interrelationships between invasion and fire. We combined two methodological approaches to assess invasion spread and impacts of buffel grass in the Aṉangu Pitjantjatjara Yankunytjatjara (APY) Lands of arid central Australia: a before‐after‐control‐impact (BACI) experiment over 25 years at 15 sites and a paired‐plot (randomized‐block) experiment at 18 sites. Both experiments spanned two geographic regions and multiple vegetation communities situated on flat plains and rocky hills. We used generalized linear mixed models to analyze predictions about plant abundance and permutational multivariate ANOVA (PERMANOVA) and permutational multivariate analysis of dispersion (PERMDISP) to examine changes in community composition. Fire and invasion interactions were explored using fire history or the relative fire tolerance of plant species as covariates, predictors, or responses. Fire interacted with the invasion process in multiple ways. Invaded sites had burnt more frequently and recently than native sites in one region, and where propagules were present in 1995, buffel grass abundance increased most when fires ensued. Abundance of understory plant functional groups (native grasses, ferns, and vines) decreased with invasion, and understory shrubs decreased due to frequent fires in invaded sites. Overstory composition shifted from fire‐sensitive species toward fire‐tolerant species, but this was not directly attributable to invasion. Partial evidence for ecosystem regime shifts included homogenization of understory communities in invaded rocky hills, and an increase in woody shrub cover at native but not invaded sites over 25 years, resulting in a 5% cover difference by 2019. Impacts were detected across heterogeneous ecological communities at a scale not previously tested amongst high background community variability. Although invasion is not dependent on fire, the acceleration of invasion spread and impacts with fire is a critical consideration for future research and management of grass invaders.

show abstract

Satellite patches, patch expansion, and doubling time as decision metrics for invasion control:Pennisetum ciliareexpansion in southwestern Arizona

Cited by 4 publications

References 33 publications

Prescribed burning may produce refugia for invasive forb, Oncosiphon pilulifer

Prescribed burning may produce refugia for invasive forb, Oncosiphon pilulifer

Spatially explicit removal strategies increase the efficiency of invasive plant species control

Long‐term and landscape impacts of buffel grass on arid plant communities: Ecosystem shifts and acceleration by fire

Contact Info

Product

Resources

About