scholarly journals Resistance variation in natural plant populations

2002 ◽  
Vol 38 (SI 1 - 6th Conf EFPP 2002) ◽  
pp. S145-S150 ◽  
Author(s):  
J.J. Burdon ◽  
P.H. Thrall

The general outcomes of long-term trajectories of coevolutionary interactions between specific hosts and pathogens are<br />set by the interaction of their life histories. However, within those outcomes the speed of co-evolutionary responses and<br />the extent of their expression in the resistance/virulence structure of wild plant and pathogen populations respectively,<br />are highly variable characters changing from place-to-place and time-to-time as a result of the interaction of host and<br />pathogen with the physical environment. As a consequence, understanding of the role of diseases in the evolution of their<br />hosts requires approaches that simultaneously deal with host and pathogen structures over multiple populations within a<br />metapopulation framework.

2020 ◽  
Vol 32 (S1) ◽  
pp. 15-16
Author(s):  
William E. Reichman ◽  
L. Bradford Perkins ◽  
Hilde Verbeek

This symposium will review the latest data on the influence of environmental design and its attributes on the cognitive and psychological wellbeing of older adults living with dementia. The presenters will cover the myriad ways in which the physical environment of care can adapt to the changing demands of older adults with sensory, motor and cognitive deficits and foster optimal functioning and quality of life. The role of emerging technologies will also be reviewed as they complement the contribution of the design of the physical environment to the wellbeing of older adults with cognitive impairment. Information will be offered through a review of the existing research literature as well as case studies that illustrate the impact of environmental modification on fostering wellbeing and minimizing the emergence of the behavioral and psychological symptoms of dementia. The presenters will represent and integrate sensibilities that have emerged from the fields of architecture, cognitive neuroscience and psychology.How the Principles of the Culture Change Movement Inform Environmental Design and the Application of Technology in the Care of Older Adults Living with DementiaWilliam E. ReichmanThe culture change movement informs a number of principles that have been applied to more contemporary design concepts for the congregate care of older adults living with dementia. This talk will review the core tenets of the Culture Change Movement as exemplified by the Greenhouse, Dementia Village and other innovative models of congregate long-term care. Specific reference will be made to how these tenets have been operationalized around the world into the design of programming and the creation of residential care environments that foster a better quality of life for older adults and an enhanced work environment for care providers. This talk will also include the emerging role of technologies that complement innovative design of the environment and which foster optimized social and recreational functioning of older adults living with dementia.A Better Life Through a Better Nursing Home DesignL. Bradford PerkinsOver the last 20 years there has been extensive experimentation related to the role of the environment in the housing, care and treatment of persons with Alzheimer’s and other age related dementias. Prior to that time the typical housing and care environment was a locked unit in a skilled nursing or other restrictive senior living facility. In 1991 the Presbyterian Association on Aging in Western Pennsylvania opened Woodside Place on its Oakmont campus. This small 36 bed facility was designed to incorporate the latest research and care experience with persons suffering from these issues. This one small project, as well as the long post occupancy research led by Carnegie Mellon University, clearly demonstrated that individuals with Alzheimer’s and related forms of dementia could lead a healthier, happier, higher quality of life in a more residential, less restrictive environment. Not everything in this pioneering project worked, and five generations of living and care models have followed that have refined the ideas first demonstrated by Woodside Place. Bradford Perkins, whose firm designed Woodside Place and over 100 other related projects, will discuss what was learned from Woodside Place as well as the five generations of projects (and post occupancy research) that followed.Innovative dementia care environments as alternatives for traditional nursing homes: evidence and experiences from the NetherlandsHilde VerbeekKey goals of the dementia care environment focus on increasing autonomy, supporting independence and trying to enable one’s own lifestyle for as long as possible. To meet these goals, innovative, small-scale and homelike care environments have been developed that have radically changed the physical, social and organizational aspects of long-term care in the Netherlands. This presentation discusses various Dutch models that have implemented small-scale and homelike care environments, including green care farms, dementia village and citizen initiatives. The models reflect a common care concept, focusing on residents’ remaining strengths, providing opportunity for choice and aiming to sustain a sense of self and control. A small number of residents (usually 6 to 8) live together in a homelike environment and nursing staff are part of the household. Residents are encouraged to participate in daily household activities, emphasizing normalization of daily life with person-centred care. The physical environment resembles an archetypal home. This talk presents the scientific evidence on the impact and effects of these small-scale, homelike models on residents, their family caregivers and staff. Furthermore, the presentation will highlight working approaches and how these initiatives have positively influenced routine care across the long-term care spectrum.


2019 ◽  
Author(s):  
K. Kreger ◽  
B. Shaban ◽  
E. Wapstra ◽  
C.P. Burridge

AbstractPhylogeography provides a means to understand mechanisms that shaped the distribution and abundance of species, including the role of past climate change. While concordant phylogeographic relationships across diverse taxa suggest shared underlying mechanisms (“phylogeographic parallelism”), it is also possible that similar patterns are the product of different mechanisms (“phylogeographic convergence”), reflecting variation among taxa in factors such as environmental tolerances, life histories, and vagility. Hence, phylogeographic concordance among closely related and ecologically similar species can yield a more confident understanding of the past mechanisms which shaped their distribution and abundance. This study documented mitochondrial and nuclear phylogeographic patterns in the ectotherm skink, Niveoscincus metallicus, which occupies historically glaciated regions of Tasmania, and contrasted these with the closely related and broadly sympatric N. ocellatus. Major phylogeographic breaks were similar in location between the two species, and indicative of isolation caused by retreat from high elevation areas during glaciations, but with long-term persistence at multiple low elevation sites. Hence, Pleistocene glacial refugia were altitudinal rather than latitudinal, a pattern mirrored in other temperate Southern Hemisphere taxa. This study also examined phylogeographic patterns across the intermittently inundated Bassian Isthmus between mainland Australia and the island of Tasmania, and revealed that structuring is similarly maintained when populations were physically isolated during interglacial rather than glacial stages.


2021 ◽  
Author(s):  
Vít Latzel ◽  
Javier Puy ◽  
Michael Thieme ◽  
Etienne Bucher ◽  
Lars Götzenberger ◽  
...  

AbstractAn accumulating body of evidence indicates that natural plant populations harbour a large diversity of transposable elements (TEs). TEs provide genetic and epigenetic variation that can substantially translate into changes in plant phenotypes. Despite the wealth of data on the ecological and evolutionary effects of TEs on plant individuals, we have virtually no information on the role of TEs on populations and ecosystem functioning. On the example of Arabidopsis thaliana, we demonstrate that TE-generated variation creates differentiation in ecologically important functional traits. In particular, we show that Arabidopsis populations with increasing diversity of individuals differing in copy numbers of the ONSEN retrotransposon had higher phenotypic and functional diversity. Moreover, increased diversity enhanced population productivity and reduced performance of interspecific competitors. We conclude that TE-generated diversity can have similar effects on ecosystem as usually documented for other biological diversity effects.


Oikos ◽  
1996 ◽  
Vol 76 (2) ◽  
pp. 411 ◽  
Author(s):  
J. J. Burdon ◽  
A. Wennström ◽  
T. Elmqvist ◽  
G. C. Kirby ◽  
A. Wennstrom

1979 ◽  
Vol 36 (3) ◽  
pp. 342-345 ◽  
Author(s):  
T. F. Waters

The symposium indicated many ways in which greater knowledge of benthic life histories can be used to develop and improve techniques such as sampling, taxonomic methods, and bioassays. Benthic organisms' diet and physical environment, factors variable in nature, were shown to be capable of modifying certain life history features such as growth rate and voltinism. The lack of accumulated life history data and the need to tailor sampling schedules to life history events were commonly identified elements in the symposium. Future research needs included (1) basic data on benthic life history, (2) improved taxonomy of immature benthic invertebrates, and (3) understanding the entire life history of an organism in relation to the seasonal progression of its environment. Management implications of benthic life history information included more applicable data from long-term bioassays on all life history stages, and improved management of stream fisheries through habitat alteration to manipulate benthic production. Key words: life history, benthos, symposium


2018 ◽  
Vol 10 (9) ◽  
pp. 3100 ◽  
Author(s):  
Qunyue Liu ◽  
Weicong Fu ◽  
Cecil van den Bosch ◽  
Yiheng Xiao ◽  
Zhipeng Zhu ◽  
...  

Globalization and urbanization have made many Chinese cities lose their distinct characteristics and have led to emotional sense of loss for individuals. Place attachment, as encompassing place dependence and place identity, is the positive emotion that describes the psychological connections between people and a certain place. Many studies have indicated that people develop place attachment toward a certain place by long-term interaction with that place. However, few studies have demonstrated that place attachment might also be evoked by a landscape that looks familiar, but with which a person has not had long-term interactions. It is important to understand the role of place attachment in urban design, as neglecting place attachment can have a negative impact on the outcomes of urban planning and urban design. In this study we explored the contributions of local landscape elements to people’s place attachment to a new physical environment by means of a cross-regional comparative study. Three groups of respondents living in three different areas of China were chosen, and a photo-based approach was used to examine the association between local landscape elements and place attachment. The results indicate, first, that local landscapes positively contribute to residents’ place attachment. Next, an individual’s place attachment to new environments can be enhanced by adding familiar local landscape elements. Findings suggest that planners and designers can build stronger place attachment by integrating landscape elements that are familiar to people. This can have implications, for example, when creating links between newcomers and the new environments to which they have moved.


2018 ◽  
Vol 285 (1873) ◽  
pp. 20172688 ◽  
Author(s):  
I. Montero-Serra ◽  
C. Linares ◽  
D. F. Doak ◽  
J. B. Ledoux ◽  
J. Garrabou

Understanding the role of the environment in shaping the evolution of life histories remains a major challenge in ecology and evolution. We synthesize longevity patterns of marine sessile species and find strong positive relationships between depth and maximum lifespan across multiple sessile marine taxa, including corals, bivalves, sponges and macroalgae. Using long-term demographic data on marine sessile and terrestrial plant species, we show that extreme longevity leads to strongly dampened population dynamics. We also used detailed analyses of Mediterranean red coral, with a maximum lifespan of 532 years, to explore the life-history patterns of long-lived taxa and the vulnerability to external mortality sources that these characteristics can create. Depth-related environmental gradients—including light, food availability, temperature and disturbance intensity—drive highly predictable distributions of life histories that, in turn, have predictable ecological consequences for the dynamics of natural populations.


2013 ◽  
Author(s):  
Francesca Menegazzo ◽  
Melissa Rosa Rizzotto ◽  
Martina Bua ◽  
Luisa Pinello ◽  
Elisabetta Tono ◽  
...  

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