The impact of <i>Acacia saligna</i> on the composition and structure of the Mediterranean maquis

Tozzi, Francesco Pio; Carranza, María Laura; Frate, Ludovico; Stanisci, Angela

doi:10.1080/14888386.2021.1936640

Cited by 9 publications

(5 citation statements)

References 88 publications

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“…Our results also evidenced that soil RS variables (summer BI2 and CI values) are important for modelling the fractional cover of A. saligna, which is consistent with the alterations in leaf litter content and soil organic matter in IAS patches usually observed in the field (Del Vecchio et al, 2013;Nsikani et al, 2017;Tozzi et al, 2021). In fact, Acacia species, being nitrogen-fixing plants, modify soil features, increasing the organic content and the development of soil microbiomes (Del Vecchio et al, 2013).…”

Section: Figuresupporting

confidence: 86%

“…Being introduced as fodder (Asefa and Tamir, 2006;George et al, 2007), windbreak and dune stabilization (Bar et al, 2004), and for ornamental purposes (Donaldson et al, 2014), it has become invasive in coastal areas across the world (e.g., South Africa, North Africa, Horn of Africa, Chile, and the Mediterranean; Thompson et al, 2015;Lozano et al, 2020). Several negative effects of A. saligna invasion on natural ecosystems were reported, for e.g., the alteration of biodiversity values, the decline of focal species, and the drastic change of vegetation structure toward dense monospecific A. saligna woodlands (Le Maitre et al, 2011;Del Vecchio et al, 2013;Tozzi et al, 2021). A. saligna also modifies soil nitrogen and organic matter content (Yelenik et al, 2004;El-Gawad and El-Amier, 2015), altering soil microbial communities (Crisóstomo et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Synergetic use of unmanned aerial vehicle and satellite images for detecting non-native tree species: An insight into Acacia saligna invasion in the Mediterranean coast

Marzialetti

Febbraro²,

Frate³

et al. 2022

Front. Environ. Sci.

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Invasive alien plants (IAPs) are increasingly threatening biodiversity worldwide; thus, early detection and monitoring tools are needed. Here, we explored the potential of unmanned aerial vehicle (UAV) images in providing intermediate reference data which are able to link IAP field occurrence and satellite information. Specifically, we used very high spatial resolution (VHR) UAV maps of A. saligna as calibration data for satellite-based predictions of its spread in the Mediterranean coastal dunes. Based on two satellite platforms (PlanetScope and Sentinel-2), we developed and tested a dedicated procedure to predict A. saligna spread organized in four steps: 1) setting of calibration data for satellite-based predictions, by aggregating UAV-based VHR IAP maps to satellite spatial resolution (3 and 10 m); 2) selection of monthly multispectral (blue, green, red, and near infra-red bands) cloud-free images for both satellite platforms; 3) calculation of monthly spectral variables depicting leaf and plant characteristics, canopy biomass, soil features, surface water and hue, intensity, and saturation values; 4) prediction of A. saligna distribution and identification of the most important spectral variables discriminating IAP occurrence using a fandom forest (RF) model. RF models calibrated for both satellite platforms showed high predictive performances (R2 > 0.6; RMSE <0.008), with accurate spatially explicit predictions of the invaded areas. While Sentinel-2 performed slightly better, the PlanetScope-based model effectively delineated invaded area edges and small patches. The summer leaf chlorophyll content followed by soil spectral variables was regarded as the most important variables discriminating A. saligna patches from native vegetation. Such variables depicted the characteristic IAP phenology and typically altered leaf litter and soil organic matter of invaded patches. Overall, we presented new evidence of the importance of VHR UAV data to fill the gap between field observation of A. saligna and satellite data, offering new tools for detecting and monitoring non-native tree spread in a cost-effective and timely manner.

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Section: Figuresupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Synergetic use of unmanned aerial vehicle and satellite images for detecting non-native tree species: An insight into Acacia saligna invasion in the Mediterranean coast

Marzialetti

Febbraro²,

Frate³

et al. 2022

Front. Environ. Sci.

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“…Acacia saligna is a widespread tree species in Corsica and Sardinia (Lozano et al 2020), in particular along the coast, and severely impacts the characteristics of soils and diversity and structure of the Mediterranean shrublands (Celesti-Grapow et al 2016;Tozzi et al 2021). The other two Acacia species, although common, are much less widespread and form dense populations only in a limited number of sites.…”

Section: Seed Collectionmentioning

confidence: 99%

“…H.L.Wendl. native to Australia, have shown in Europe invasive potential and negative impacts on native species, to the extent that containment measures have been implemented (Lowe et al 2000;European Union 2014;Tozzi et al 2021). Therefore, monitoring the presence of seed beetles of invasive Acacia spp.…”

Section: Introductionmentioning

confidence: 99%

Establishment and new hosts of the non-native seed beetle Stator limbatus (Coleoptera, Chrysomelidae, Bruchinae) on acacias in Europe

Cocco¹,

Brundu²,

Berquier³

et al. 2021

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Stator limbatus is a phytophagous beetle native to warm regions of North and Central America, feeding on Fabaceae seeds and one of the most polyphagous species within the subfamily Bruchinae, here reported for the first time in Europe and on new hosts. Adult beetles emerged from Acacia spp. seeds collected in the islands of Corsica (France), and Sardinia (Italy). The wide presence in Sardinia and Corsica supports the hypothesis that this alien species was introduced several years ago. In both islands, S. limbatus emerged from Acacia mearnsii seeds, with infestation rates of up to 74.2 and 90.8% in 2019 and 2020, respectively. This seed beetle also emerged from two previously unreported host species, Acacia saligna and A. pycnantha, showing highest infestation rates of 4.0 and 95.1%, respectively. Both Acacia species are reported as new host associations with S. limbatus. Overall, seed infestation rates recorded in 2019 and 2020 indicate that S. limbatus is well established and that Mediterranean bioclimatic conditions are suitable for its population increase in size. This study lays the foundations for further research on known and potential host species and the spread and distribution of S. limbatus in Europe.

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“…and Xanthium orientale L. subsp. italicum (Moretti) Greuter [24][25][26][27][28]. Recent research showed that these IAP often caused the decline in species richness and the decrease in cover of diagnostic/focal species of Italian native plant communities [27,[29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Identifying Critical Thresholds in the Impacts of Invasive Alien Plants and Dune Paths on Native Coastal Dune Vegetation

Francesco

Tozzi

Buffa

et al. 2022

Land

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Invasive alien plants (IAP) pose a major threat to biodiversity and have a negative impact on the integrity and conservation status of plant communities. Mediterranean dunes are widely exposed to IAP, due to their environmental heterogeneity and the anthropogenic pressures to which they are subjected. The current study explored the possible existence of critical thresholds of IAP cover/abundance and dune path impacts that may cause the decline in diagnostic species cover in shifting and transition dunes. A random sampling of 126 plots in areas invaded and not invaded by IAP across the Italian Adriatic dunes has been used and the recorded species have been classified in ecological guilds. In order to explore the effect of plant community composition and distances from dune paths on the diagnostic species cover, a Random Forest regression model has been fitted. The results revealed that three main critical thresholds can be detected concerning IAP total cover, IAP Oenothera stucchii Soldano abundance and the distance from dune paths and they work differently in shifting and transition dunes. The identification of such cut-off points provides useful insights for an array of actions to preserve the biodiversity of the Mediterranean coastal dunes.

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The impact of Acacia saligna on the composition and structure of the Mediterranean maquis

Cited by 9 publications

References 88 publications

Synergetic use of unmanned aerial vehicle and satellite images for detecting non-native tree species: An insight into Acacia saligna invasion in the Mediterranean coast

Synergetic use of unmanned aerial vehicle and satellite images for detecting non-native tree species: An insight into Acacia saligna invasion in the Mediterranean coast

Establishment and new hosts of the non-native seed beetle Stator limbatus (Coleoptera, Chrysomelidae, Bruchinae) on acacias in Europe

Identifying Critical Thresholds in the Impacts of Invasive Alien Plants and Dune Paths on Native Coastal Dune Vegetation

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The impact of Acacia saligna on the composition and structure of the Mediterranean maquis

Cited by 9 publications

References 88 publications

Synergetic use of unmanned aerial vehicle and satellite images for detecting non-native tree species: An insight into Acacia saligna invasion in the Mediterranean coast

Synergetic use of unmanned aerial vehicle and satellite images for detecting non-native tree species: An insight into Acacia saligna invasion in the Mediterranean coast

﻿Establishment and new hosts of the non-native seed beetle Stator limbatus (Coleoptera, Chrysomelidae, Bruchinae) on acacias in Europe

Identifying Critical Thresholds in the Impacts of Invasive Alien Plants and Dune Paths on Native Coastal Dune Vegetation

Contact Info

Product

Resources

About

Establishment and new hosts of the non-native seed beetle Stator limbatus (Coleoptera, Chrysomelidae, Bruchinae) on acacias in Europe