An assessment of the potential for pollination facilitation of a rare plant by common plants: Symphyotrichum sericeum (Asteraceae) as a case study

Botany ◽  
2013 ◽  
Vol 91 (1) ◽  
pp. 34-42 ◽  
Author(s):  
Diana Bizecki Robson
Keyword(s):  
Seed Production ◽  
Plant Species ◽  
Plant Density ◽  
Stem Density ◽  
Rare Plant ◽  
Wide Range ◽  
Insect Visitation ◽  
Aggregative Response ◽  
Generalist Insect ◽  
The Impact

Pollination facilitation can occur when plant species share pollinators. Whether facilitation occurs depends on the flowering period overlap (synchrony), number of shared insect visitors (similarity), quantity and quality of insect visits, and the subsequent impact on seed production. Western Silvery Aster (Symphyotrichum sericeum (Vent.) G.L. Nesom) is a rare, self-incompatible plant visited by a wide range of generalist insect species. There are 22 common plant species that may facilitate insect visitation to the rare plant by supporting shared pollinators. Plant species with low synchrony and high similarity with S. sericeum are potential facilitators. In contrast, plant species with high synchrony and similarity likely act as competitors as the aggregative response to increasing plant density was saturating, suggesting that synchronously flowering species do not increase insect visitations. Hymenoptera responded more strongly than Diptera to increases in flowering stem density. These data suggest that facilitation of insect visitation between plant species via a numerical response that extends the flower season is possible but not likely via an aggregative response. Restoration of S. sericeum may therefore be more successful if potentially facilitating plants are grown with it; further testing of the impact of potential facilitators on seed production in S. sericeum is required.

scholarly journals Synphytoindication evaluation of habitats of plant species listed in the Red Data Book of Ukraine and habitat risk assessment under the impact of climate change

2020 ◽  
Vol 77 (6) ◽  
pp. 434-453
Author(s):  
V.V. Budzhak ◽  
◽  
Ya.P. Didukh ◽  
Keyword(s):  
Plant Species ◽  
Vascular Plants ◽  
Complete Information ◽  
Ecological Assessment ◽  
Red Data Book ◽  
Average Annual Temperature ◽  
Wide Range ◽  
Ecological Values ◽  
Data Book ◽  
The Impact

Ecological assessment of plant habitats in the territory of the upper basin of the Prut River was carried out using synphytoindication analysis of 2386 vegetation plots. This provided an opportunity to supplement the assessment of habitat conditions for 84 species of vascular plants listed in the Red Data Book of Ukraine. The conducted phytoindication assessment allowed to update and clarify information on the ranges of ecological amplitude for 55 species from the Red Data Book of Ukraine as well as to calculate indicators values for Crepis jacquinii for the first time. Based on the results of phytoindication assessment made for 49 species, the maximum ecological values (for 37 species) and minimum ecological values (for 38 species) were specified. Complete information on 12 environmental factors was obtained for habitats of 55 species, or 9% of species of vascular plants in the Red Data Book of Ukraine. A degree of possible threat to plant habitats is calculated, i.e. their reduction and loss due to increase in average annual temperature by 1, 2 and 3 °C. With the increase in temperature by 3 °C, the risk of habitat loss can reach 30% and only 3.5% of habitats remain out of danger, which indicates the catastrophic state of the studied habitats. At the same time, rising temperature can significantly affect the edaphic properties of the soil, in particular, the acidity regime; such indirect climate effects can be more significant for ecosystems than the direct ones. The obtained data indicate the risk of loss of species habitats, and subsequent result depends on further realization of species potential. Three options of the realization are possible: reduction and extinction, migration to other areas or landscape elements, and enhancing adaptive capacity of species. Results of ecological assessment of plant species and forecasting possible changes in their habitats based on synphytoindication methodology demonstrated the effectiveness and wide range of use of this methodology.

scholarly journals No universal scale-dependent impacts of invasive species on native plant species richness

2014 ◽  
Vol 10 (1) ◽  
pp. 20130939 ◽  
Author(s):  
Thomas J. Stohlgren ◽  
Marcel Rejmánek
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Plant Invasions ◽  
Plant Species Richness ◽  
Native Plant ◽  
Desert Ecosystems ◽  
Alien Plant ◽  
Native Plant Species ◽  
Wide Range ◽  
The Impact

A growing number of studies seeking generalizations about the impact of plant invasions compare heavily invaded sites to uninvaded sites. But does this approach warrant any generalizations? Using two large datasets from forests, grasslands and desert ecosystems across the conterminous United States, we show that (i) a continuum of invasion impacts exists in many biomes and (ii) many possible species–area relationships may emerge reflecting a wide range of patterns of co-occurrence of native and alien plant species. Our results contradict a smaller recent study by Powell et al. 2013 ( Science 339 , 316–318. ( doi:10.1126/science.1226817 )), who compared heavily invaded and uninvaded sites in three biomes and concluded that plant communities invaded by non-native plant species generally have lower local richness (intercepts of log species richness–log area regression lines) but steeper species accumulation with increasing area (slopes of the regression lines) than do uninvaded communities. We conclude that the impacts of plant invasions on plant species richness are not universal.

scholarly journals ¿Qué sabemos de la rareza en especies vegetales? Un enfoque genético-demográfico

2017 ◽  
pp. 17
Author(s):  
Ligia Guadalupe Esparza-Olguín
Keyword(s):  
Plant Species ◽  
Point Of View ◽  
Rare Plant ◽  
Genetic Studies ◽  
Reproductive Process ◽  
Rare Plant Species ◽  
Population Growth Rates ◽  
Wide Range ◽  
Genetic Patterns ◽  
Range Of Values

In this paper I present a review of a number of studies that have addressed demographic or genetic aspects of rare plant species, with the purpose of analyzing whether there are any demographic or genetic patterns which characterize them. From this review, I observed that in the majority of the rare plant species studied from a demographic point of view, several common features appear: population growth rates close to unity, important reproductive limitations, low germinability, low recruitment rates, and in some cases, certain aspects of the reproductive process are associated to intermittent events. Regarding the genetic studies, the existence of a wide range of values in the genetic variability of rare species became clear. Therefore, it may be concluded that rare plant species constitute a biologically heterogeneous assemblage. At present it is not possible to conclude about the existence of general demographic or genetic patterns within this group.

scholarly journals Substitution of the most important and declining wild food species in southeast Burkina Faso

2015 ◽  
Vol 18 ◽  
pp. 11-20
Author(s):  
Anna Leßmeister ◽  
Katharina Schumann ◽  
Anne Mette Lykke ◽  
Katja Heubach ◽  
Adjima Thiombiano ◽  
...  
Keyword(s):  
Burkina Faso ◽  
Plant Species ◽  
Negative Impact ◽  
Wild Plant ◽  
Wild Food ◽  
Wide Range ◽  
Perceived Change ◽  
Food Species ◽  
Socio Economic Variables ◽  
The Impact

Wild plant species are important nutritious supplements to otherwise nutrient poor diets of rural populations in West Africa. Consequently, a decline of wild food species has a direct negative impact on the nutritional status of local households. In this study, we firstly investigated the preferred wild food species in south-east Burkina Faso, their perceived change in abundance as well as their contribution to wild food income. Secondly, we studied how these species might be substituted in times of species shortfall. Thirdly, we investigated the impact of socio-economic variables on the substitution choice. We conducted 155 household interviews in two villages and found 21 wild food species. With a contribution of almost 70% to wild food income, Vitellaria paradoxa and Parkia biglobosa were economically most important. All species were considered declining to some degree. The wide range of cited substitutes for the ten most important wild food species indicates a great knowledge on alternative plant species in the area. For the majority, the substitution choice did not depend on socio-economic characteristics. Cited as surrogate for several important wild food species, the native tree Balanites aegyptiaca was the most important substitute species. Many valued wild food species were substituted with other highly valued wild food species and therefore the decline of one species can lead to a shortfall of another substitute. Thus, even though our results suggest that people are able to counteract the decrease or absence of wild food species, growing decline of one species would concurrently increase the pressure on other native food species.

scholarly journals Effect of Plant Morphological Traits on Throughfall, Soil Moisture, and Runoff

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1731 ◽  
Author(s):  
Yu Liu ◽  
Liang Zhao
Keyword(s):  
Soil Moisture ◽  
Water Balance ◽  
Plant Species ◽  
Morphological Traits ◽  
Leaf Shape ◽  
Semiarid Region ◽  
Stem Density ◽  
Native Plant ◽  
Plant Morphological Traits ◽  
The Impact

Plant canopy morphology plays an important role in water balance, peculiarly in semiarid environments. Through a field experiment, the impact of plant morphology of two native plant species, Artemisia sacrorum Ledeb (ASL) and Spiraea pubescens Turcz (SPT), on partitioning rainwater was revealed. The results indicated that a fragmented leaf shape and apparently high stem density of ASL reduced the throughfall and its intensity effectively but facilitated soil moisture replenishment. Although SPT has a greater canopy cover and canopy depth than ASL does, larger throughfall, a smaller throughfall threshold, and stronger throughfall intensity were observed in the SPT site. Moreover, the SPT site has a higher soil steady infiltration rate, but produced more surface runoff and caused lower soil moisture content. This study highlights the importance of plant morphological traits, peculiarly leaf morphology, in partitioning rainwater in this semiarid region. We argue that plant morphological traits should be considered when selecting plant species for revegetation and assessing water balance.

Using Long-Term Population Monitoring Data to Prioritize Conservation Action among Rare Plant Species

2019 ◽  
Vol 39 (2) ◽  
pp. 169 ◽  
Author(s):  
Holly L. Bernardo ◽  
Pati Vitt ◽  
Rachel Goad ◽  
Susanne Masi ◽  
Tiffany M. Knight
Keyword(s):  
Plant Species ◽  
Population Monitoring ◽  
Monitoring Data ◽  
Rare Plant ◽  
Conservation Action ◽  
Rare Plant Species

THE IMPACT OF LEADERSHIP PRACTICES TO TEAM MEMBERS’ SATISFACTION

2009 ◽  
Vol 8 (1) ◽  
Author(s):  
Chalimah .
Keyword(s):  
Conflict Resolution ◽  
Leadership Practices ◽  
Hotel Industry ◽  
Leader Behavior ◽  
Team Leader ◽  
Shop Floor ◽  
Team Members ◽  
Top Executives ◽  
Wide Range ◽  
The Impact

eamwork is becoming increasingly important to wide range of operations. It applies to all levels of the company. It is just as important for top executives as it is to middle management, supervisors and shop floor workers. Poor teamwork at any level or between levels can seriously damage organizational effectiveness. The focus of this paper was therefore to examine whether leadership practices consist of team leader behavior, conflict resolution style and openness in communication significantly influenced the team member’s satisfaction in hotel industry. Result indicates that team leader behavior and the conflict resolution style significantly influenced team member satisfaction. It was surprising that openness in communication did not affect significantly to the team members’ satisfaction.

Stress, anxiety, depression and burnout in frontline health care workers during COVID-19 pandemic: a brief systematic review and new data from Russia

2021 ◽  
Author(s):  
Ekaterina Mosolova ◽  
Dmitry Sosin ◽  
Sergey Mosolov
Keyword(s):  
Risk Factors ◽  
Systematic Review ◽  
Female Gender ◽  
Assessment Tools ◽  
Care Workers ◽  
Younger Age ◽  
Wide Range ◽  
Associated Risk Factors ◽  
Anxiety Depression ◽  
The Impact

During the COVID-19 pandemic, healthcare workers (HCWs) have been subject to increased workload while also exposed to many psychosocial stressors. In a systematic review we analyze the impact that the pandemic has had on HCWs mental state and associated risk factors. Most studies reported high levels of depression and anxiety among HCWs worldwide, however, due to a wide range of assessment tools, cut-off scores, and number of frontline participants in the studies, results were difficult to compare. Our study is based on two online surveys of 2195 HCWs from different regions of Russia during spring and autumn epidemic outbreaks revealed the rates of anxiety, stress, depression, emotional exhaustion and depersonalization and perceived stress as 32.3%, 31.1%, 45.5%, 74.2%, 37.7% ,67.8%, respectively. Moreover, 2.4% of HCWs reported suicidal thoughts. The most common risk factors include: female gender, nurse as an occupation, younger age, working for over 6 months, chronic diseases, smoking, high working demands, lack of personal protective equipment, low salary, lack of social support, isolation from families, the fear of relatives getting infected. These results demonstrate the need for urgent supportive programs for HCWs fighting COVID-19 that fall into higher risk factors groups.

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