Road Dust Correlated with Decreased Reproduction of the Endangered Utah Shrub <i>Hesperidanthus suffrutescens</i>

Lewis, Matthew; Schupp, Eugene W.; Monaco, Thomas A.

doi:10.3398/064.077.0404

Cited by 9 publications

(12 citation statements)

References 26 publications

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“…On the other hand, dust particles of a size range lower than the diameter of stomata (8-12 μm) can enter through stomatal pores, interact with spongy mesophyll cells, disrupt the photosynthetic reaction center, and impede the overall plant growth (Sett 2017). The results of the present study are consistent with the findings of Lewis et al (2017). They reported a decrease in stomatal conductance of Hesperidanthus suffrutescens leaves growing near an unpaved road and bearing high amounts of dust as compared with those growing at a certain distance from the road with lighter dust contamination.…”

Section: Iforest -Biogeosciences and Forestrysupporting

confidence: 90%

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Effect of dust accumulation on Quercus cerris L. leaves in the Ezer forest, Lebanon

Najib¹,

Houri²,

Khairallah³

et al. 2022

iForest

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Air pollution arising from different sources represents a serious environmental threat to all living organisms, including vegetation. Monitoring air contamination levels is necessary to detect pollution levels, regulate atmospheric pollution, and ultimately improve ambient air quality. The current study evaluated the effects of air pollutants with a focus on dust and some biochemical and physiological properties of Quercus cerris L., which is growing in Lebanon's Ezer forest, threatened by the presence of a public road on its northern side. The studied parameters include leaf extract pH, stomatal conductance, relative water content, hydrogen peroxide, proline, carotenoids, and air pollution tolerance index. These parameters can provide reliable information about the tolerance status of plants towards pollutants. Three sites with different exposure to vehicular activities were used to conduct this study, including a control site (unpolluted) and two polluted sites (S1 and S2). The results showed a significant reduction in stomatal conductance and relative water content at polluted sites compared with the control site. Hydrogen peroxide, proline, and carotenoids showed the highest levels at the S2 site, which is indicative of the fact that Quercus cerris undergoes established physiological and biochemical changes in response to environmental stress. Based on the air pollution tolerance index (4.97-9.85) Quercus cerris is categorized as a sensitive species that can be used as a biological monitor of environmental pollution. Thus, the development and implementation of efficient environmental action plans based on biomonitoring should be considered for protecting the forests.

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Section: Iforest -Biogeosciences and Forestrysupporting

confidence: 90%

“…They reported higher dust deposition on the leaves of all the studied plant species growing on the edge of heavy-traffic roads when compared with those from control sites. Lewis et al (2017) also observed in their study that the levels of dust deposition decreased as the distance from the unpaved road increased.…”

Section: Resultsmentioning

confidence: 63%

Effect of dust accumulation on Quercus cerris L. leaves in the Ezer forest, Lebanon

Najib¹,

Houri²,

Khairallah³

et al. 2022

iForest

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“…Common observations include, reduction in leaf dry weight, destruction of photosynthetic pigments, damaged cell membrane permeability, stomatal index, and develop oxidative stresses (Chaudhury & Rathore, 2018 ; Clark et al, 2008 ; Currie & Bass, 2008 ; Leghari & Zaidi, 2013 ). More recent research reveals damage of optical properties, especially leaf surface reflectance in the visible and near infrared region (Gupta et al, 2016a , b ); pollination and reproduction (Lewis et al, 2017 ; Waser et al, 2017 ); reduction in photosynthetic pigments including chlorophyll “a,” “b,” and carotenoids (Joshi & Swami, 2009 ; Sen et al, 2017 ); enhancement of transpiration, thereby risking rapid water loss (Kameswaran et al, 2019 ), to name a few. We urge the urban authorities to consult the work of Muthu et al ( 2021 ), who summarized potential adversities of pollution on roadside plants (Table 4 ).…”

Section: Discussionmentioning

confidence: 99%

Urban greenery for air pollution control: a meta-analysis of current practice, progress, and challenges

Chaudhuri

Kumar²

2022

Environ Monit Assess

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Most governmental initiatives in India, to leash down urban air pollution, have yielded little results till date, largely due to purely technocratic vision, which is shrouded by technological, economic, social, institutional, and political hardships. We present this reflective article on urban greenery, as a proposition to urban authorities (e.g., pollution regulators, environmental systems’ managers, urban landscape planners, environmental policy makers), shift from purely technocratic way of thinking to thinking with nature , by strategic greening of urban spaces, for long-term air pollution prevention and control measures. To that end, we offer a meta-analysis of recent (post 2005) global literature using four-stage PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) approach. We open the narrative by briefing about main pollutant filtration mechanisms by trees, followed by cognitive aspects of species selection (e.g., deciduous vs. evergreen, air pollution tolerance index, environmental stressors). Till date, most Indian studies on urban greenery mostly but focused on physiological aspects of trees. Here, we draw attention of urban authorities to an equally compelling, but yet less explored, aspect: design criteria, with reference to two most common urban configurations, namely, street canyon and open road. With pictorial depictions, we enumerate various categories of street canyons and discuss aspect ratio (building height to street width) and various wind flow regimes (isolated roughness, wake interface, and skimming), that the urban authorities should be cognizant about to maximize pollutant removal efficiency. For open road, we discuss vegetation barriers, with special emphasis on canopy porosity/density functions. In the final sections, we reflect on a potential systems’ thinking approach for on-ground implementation, comprising of revamping of urban forestry programs, research and development, community mobilization and stakeholder engagement, and strategic outreach. In addition, we emphasize on means to harness co-benefits of urban greenery, beyond mere pollutant removal, to garner support from urban residents’ communities. Last but not the least, we also caution the urban authorities about the undesirable outcomes of urban greenery that will require more process-level research. Supplementary Information The online version contains supplementary material available at 10.1007/s10661-022-09808-w.

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“…While Beehive Dome is relatively far from this development, the area does have active grazing allotments [17]. It is possible that disturbance due to large machinery associated with development, such as high dust generation [26], could influence plant-pollinator interactions.…”

Section: Reproductive Output Trendsmentioning

confidence: 99%

Reproductive Success of an Endangered Plant after Invasive Bees Supplant Native Pollinator Services

DeNittis

Meyer

2021

Diversity

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Arctomecon humilis (dwarf bear poppy) is an endangered gypsophile restricted to the St. George area in southern Utah, USA. Extirpation of the rare oligolectic bee Perdita meconis and decline of other native pollinators within the last 20 years has been largely attributed to the advent of invasive Africanized honeybees (AHBs), which have become the predominant pollinator for A. humilis. A three-year study was carried out to determine if reliance on AHBs had a negative effect on reproductive output. In the first year, pollen addition experiments were carried out in a small, isolated population to determine if pollinator scarcity or genetic factors affected reproductive output. In the subsequent two years, reproductive output studies were conducted across four populations. In all years, fruit set across study sites was exceptionally high. There was no consistent effect from flower number or interplant distance, which have historically been shown to have a significant impact on reproductive output prior to AHB arrival. The consequences and sustainability of this relatively young relationship between A. humilis and the AHB remain unclear. However, high reproductive success shows that the AHB is currently capable of adequately fulfilling pollinator services for A. humilis.

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Road Dust Correlated with Decreased Reproduction of the Endangered Utah Shrub Hesperidanthus suffrutescens

Cited by 9 publications

References 26 publications

Effect of dust accumulation on Quercus cerris L. leaves in the Ezer forest, Lebanon

Effect of dust accumulation on Quercus cerris L. leaves in the Ezer forest, Lebanon

Urban greenery for air pollution control: a meta-analysis of current practice, progress, and challenges

Reproductive Success of an Endangered Plant after Invasive Bees Supplant Native Pollinator Services

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