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5 results for “reduced mowing”
Fig. 1 in Reducing mowing frequency increases floral resource and butterfly (Lepidoptera: Hesperioidea and Papilionoidea) abundance in managed roadside margins
Fig. 1. Effects of mowing treatment (no mowing, mowing every 6 wk, and mowing every 3 wk) on butterfly abundance and mortality. (a) Live butterflies were counted every other week and summed for the section replicates of each mowing treatment. (b) Dead butterflies were counted weekly and summed for the section replicates of each mowing treatment. (c) The relative butterfly mortalities were calculated every 3 wk as ΣDead / (ΣDead + ΣLive) for the section replicates of each mowing treatment. The gray box on each x-axis indicates when the interrupted 6 wk treatment (6* wk) was added due a mowing error in the 6 wk treatment sections in Site 2. The 6* wk treatment was split from the 6 wk treatment for the whole time period in all sites for longitudinal reasons, i.e., to avoid an unnatural drop in the 6 wk treatment afer the mowing error. The 6* wk treatment was split afer the mowing error in Site 2 in the statistical analysis. Black vertical lines represent the knots that separated the data into spline sections for the statistical analyses.
Is mowing effective in reducing rodent damage to forest plantations?
<p>Forest trees, particularly at a young age in afforestation, are susceptible to bark gnawing by herbivorous rodents such as voles. Few preventive measures for vole damage exist, although mowing to control herbaceous vegetation is often suggested. However, no empirical evidence supports the claim that mowing prevents or inhibits rodent damage to seedlings in a forest ecosystem. We examined the effects of single mowing on rodent population dynamics and the amount of damage they cause. The study was conducted in 2019 - 2021 at 34 randomly selected European beech forest plantations in Poland, with half manually mowed in late summer.</p> <h3>Methods</h3> <div> <p><strong>Rodent damage to trees</strong><br>To assess the duration and intensity of bark damage caused by small rodents, European beech saplings on 20 forest plantations were monitored monthly from December to April. Tree gnawing intensity was conducted from December 2019 to April 2021. During the tree survey, 150 beech saplings were inspected for signs of gnawing marks in each selected plantation. Any newly gnawed trees were recorded and marked. The proportion of gnawed trees to unaffected trees per month was used to measure damage intensity.</p> <p><strong>Small rodent abundance</strong><br>To estimate rodent abundance, small rodent surveys were conducted on 30 of the plantations. Surveys for rodents and tree damage were carried out in 16 plantations. Trapping lasted from January 2020 to August 2021. The small rodent’s community structure and population dynamics were surveyed using a catch-mark-release method during 5-day live-trapping sessions conducted eight times approximately every three months. Trapping sites were designated randomly within the plantations. At each site, 15 wooden boxes baited with oats and apples were placed in three rows 10 m apart and checked every 12 hours. Captured rodents were identified to species, marked non-individually by fur clipping at first capture, or recorded as a recapture.</p> </div>
Lupclip: Annual mowing has the potential to reduce the invasion of herbaceous Lupinus polyphyllus
<p>In order to manage invasive plant species efficiently, it is necessary to have a thorough understanding of different strategies of population control, including the underlying mechanisms of action and the consequences for target populations. Here, I explored the effectiveness of biomass removal as a method of control for the invasive perennial herb <i>Lupinus polyphyllus</i>. More specifically, using seed material from 11 populations, I assessed among-population variation (if any) in plant compensatory growth as a response to annual biomass removal under standardised growing conditions over two consecutive years, and quantified the demographic effects of a single biomass-removal event. In all study populations, annual biomass removal reduced plant size, flowering probability, and shoot and root biomass. Biomass removal also reduced plant survival and the number of flowering shoots, but these effects were pronounced at certain time points only. A population-level demographic analysis revealed that a single biomass-removal event considerably decreased the long-term population growth rate (λ); this decline in λ was due to a reduction in plant fecundity followed by survival and growth. These findings suggest that annual mowing has the potential to curb invasions of <i>L. polyphyllus </i>because plants are not able to fully compensate for drastic biomass loss.</p>
Lupclip: Annual mowing has the potential to reduce the invasion of herbaceous Lupinus polyphyllus
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Fig. 2 in Reducing mowing frequency increases floral resource and butterfly (Lepidoptera: Hesperioidea and Papilionoidea) abundance in managed roadside margins
Fig. 2. Effects of the 3 mowing treatments on the 4 floral resource response variables. (a) Density of all species, (b) density of known nectar species, (c) species richness of all species, and (d) species richness of known nectar species. The graphs depict the raw means. Different letters above the bars indicate means that are significantly different.
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Allen Brain Atlas
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OpenNeuro
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