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Ecological systems theory

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https://www.readbyqxmd.com/read/28421267/potential-distribution-of-mountain-cloud-forest-in-michoac%C3%A3-n-mexico-prioritization-for-conservation-in-the-context-of-landscape-connectivity
#1
Camilo A Correa Ayram, Manuel E Mendoza, Andrés Etter, Diego R Pérez Salicrup
Landscape connectivity is essential in biodiversity conservation because of its ability to reduce the effect of habitat fragmentation; furthermore is a key property in adapting to climate change. Potential distribution models and landscape connectivity studies have increased with regard to their utility to prioritizing areas for conservation. The objective of this study was to model the potential distribution of Mountain cloud forests in the Transversal Volcanic System, Michoacán and to analyze the role of these areas in maintaining landscape connectivity...
April 18, 2017: Environmental Management
https://www.readbyqxmd.com/read/28416694/experimental-dispersal-reveals-characteristic-scales-of-biodiversity-in-a-natural-landscape
#2
Rachel M Germain, Sharon Y Strauss, Benjamin Gilbert
Ecological theory posits that dispersal among habitat patches links local communities and is a key "regional" process that maintains biological diversity. However, manipulations required to experimentally test regional processes are infeasible for most systems, and thus more work is needed to detect the scales at which regional processes manifest and their overall effect on diversity. In a Californian grassland, a hotspot for global biodiversity, we used a seed vacuum to increase dispersal at spatial scales varying from 1 m to 10 km while maintaining a realistic spatial structure of species pools and environmental conditions...
April 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28412270/how-surgeons-conceptualize-talent-a-qualitative-study-using-sport-science-as-a-lens
#3
Rune Dall Jensen, Mette Krogh Christensen, Kori A LaDonna, Mikkel Seyer-Hansen, Sayra Cristancho
OBJECTIVES: Debates prevail regarding the definition of surgical talent, and how individuals with the potential to become talented surgeons can be identified and developed. However, over the past 30 years, talent has been studied extensively in other domains. The objectives of this study is to explore notions of talent in surgery and sport in order to investigate if the field of surgical education can benefit from expanding its view on talented performances. Therefore, this study aims to use the sport literature as a lens when exploring how surgeons conceptualize and define talent...
April 12, 2017: Journal of Surgical Education
https://www.readbyqxmd.com/read/28410029/ecological-pleiotropy-suppresses-the-dynamic-feedback-generated-by-a-rapidly-changing-trait
#4
John P DeLong
Population dynamics may carry a signature of an ecology-evolution-ecology feedback, known as eco-evolutionary dynamics, when functionally important traits change. Given current theory, the absence of a feedback from a trait with strong links to species interactions should not occur. In a previous study with the Didinium-Paramecium predator-prey system, however, rapid and large-magnitude changes in predator cell volume occurred without any noticeable effect on the population dynamics. Here I resolve this theory-data conflict by showing that ecological pleiotropy-when a trait has more than one functional effect on an ecological process-suppresses shifts in dynamics that would arise, given the links between cell volume and the species interaction...
May 2017: American Naturalist
https://www.readbyqxmd.com/read/28405367/shifts-in-rotifer-life-history-in-response-to-stable-isotope-enrichment-testing-theories-of-isotope-effects-on-organismal-growth
#5
Elena Gorokhova
In ecology, stable isotope labelling is commonly used for tracing material transfer in trophic interactions, nutrient budgets and biogeochemical processes. The main assumption in this approach is that the enrichment with a heavy isotope has no effect on the organism growth and metabolism. This assumption is, however, challenged by theoretical considerations and experimental studies on kinetic isotope effects in vivo. Here, I demonstrate profound changes in life histories of the rotifer Brachionus plicatilis fed (15)N-enriched algae (0...
March 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28379556/fusing-biodiversity-metrics-into-investigations-of-daily-life-illustrations-and-recommendations-with-emodiversity
#6
Lizbeth Benson, Nilam Ram, David M Almeida, Alex J Zautra, Anthony D Ong
Objectives: Functionalist emotion and ecological systems theories suggest emodiversity-the variety and relative abundance of individuals' emotion experiences-is beneficial for psychological and physical health and may change with age. This paper examines and provides recommendations for operationalization of diversity-type intraindividual variability (IIV) constructs using intensive longitudinal data, and demonstrates the utility of emodiversity by examining its links to physical health moderated by mean levels of emotion and age...
March 30, 2017: Journals of Gerontology. Series B, Psychological Sciences and Social Sciences
https://www.readbyqxmd.com/read/28369917/food-web-structure-of-willow-galling-sawflies-and-their-natural-enemies-across-europe
#7
Jens-Peter Kopelke, Tommi Nyman, Kévin Cazelles, Dominique Gravel, Steve Vissault, Tomas Roslin
Communities consist of species and their interactions. They can thus be described as networks, with species as nodes and interactions as links. Within such networks, the diversity of nodes and the distribution of links may affect patterns of energy transfer between trophic levels, the dynamics of the system, and the outcome in terms of ecosystem functioning. To date, most descriptions of networks have focused on single or relatively few sites, and have oftentimes been built on poorly-resolved nodes and links...
March 29, 2017: Ecology
https://www.readbyqxmd.com/read/28369822/improving-the-assessment-of-predator-functional-responses-by-considering-alternate-prey-and-predator-interactions
#8
K Chan, S Boutin, T J Hossie, C J Krebs, M O'Donoghue, D L Murray
To improve understanding of the complex and variable patterns of predator foraging behavior in natural systems, it is critical to determine how density-dependent predation and predator hunting success are mediated by alternate prey or predator interference. Despite considerable theory and debate seeking to place predator-prey interactions in a more realistic context, few empirical studies have quantified the role of alternate prey or intraspecific interactions on predator-prey dynamics. We assessed functional responses of 2 similarly-sized, sympatric carnivores, lynx (Lynx canadensis) and coyotes (Canis latrans), foraging on common primary (snowshoe hares; Lepus americanus) and alternate (red squirrels; Tamiasciurus hudsonicus) prey in a natural system...
March 29, 2017: Ecology
https://www.readbyqxmd.com/read/28361471/perceiver-as-polar-planimeter-direct-perception-of-jumping-reaching-and-jump-reaching-affordances-for-the-self-and-others
#9
Brandon J Thomas, Matthew M Hawkins, Patrick Nalepka
Runeson (Scandanavian Journal of Psychology 18:172-179, 1977) suggested that the polar planimeter might serve as an informative model system of perceptual mechanism. The key aspect of the polar planimeter is that it registers a higher order property of the environment without computational mediation on the basis of lower order properties, detecting task-specific information only. This aspect was posited as a hypothesis for the perception of jumping and reaching affordances for the self and another person. The findings supported this hypothesis...
March 30, 2017: Psychological Research
https://www.readbyqxmd.com/read/28355471/moving-from-static-to-dynamic-models-of-the-onset-of-mental-disorder-a-review
#10
Barnaby Nelson, Patrick D McGorry, Marieke Wichers, Johanna T W Wigman, Jessica A Hartmann
Importance: In recent years, there has been increased focus on subthreshold stages of mental disorders, with attempts to model and predict which individuals will progress to full-threshold disorder. Given this research attention and the clinical significance of the issue, this article analyzes the assumptions of the theoretical models in the field. Observations: Psychiatric research into predicting the onset of mental disorder has shown an overreliance on one-off sampling of cross-sectional data (ie, a snapshot of clinical state and other risk markers) and may benefit from taking dynamic changes into account in predictive modeling...
March 29, 2017: JAMA Psychiatry
https://www.readbyqxmd.com/read/28346736/loss-of-predator-species-not-intermediate-consumers-triggers-rapid-and-dramatic-extinction-cascades
#11
Ian Donohue, Owen L Petchey, Sonia Kéfi, Alexandre Génin, Andrew L Jackson, Qiang Yang, Nessa E O'Connor
Ecological networks are tightly interconnected, such that loss of a single species can trigger additional species extinctions. Theory predicts that such secondary extinctions are driven primarily by loss of species from intermediate or basal trophic levels. In contrast, most cases of secondary extinctions from natural systems have been attributed to loss of entire top trophic levels. Here, we show that loss of single predator species in isolation can, irrespective of their identity or the presence of other predators, trigger rapid secondary extinction cascades in natural communities far exceeding those generally predicted by theory...
March 27, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28341706/partner-abundance-controls-mutualism-stability-and-the-pace-of-morphological-change-over-geologic-time
#12
Guillaume Chomicki, Susanne S Renner
Mutualisms that involve symbioses among specialized partners may be more stable than mutualisms among generalists, and theoretical models predict that in many mutualisms, partners exert reciprocal stabilizing selection on traits directly involved in the interaction. A corollary is that mutualism breakdown should increase morphological rates of evolution. We here use the largest ant-plant clade (Hydnophytinae), with different levels of specialization for mutualistic ant symbionts, to study the ecological context of mutualism breakdown and the response of a key symbiosis-related trait, domatium entrance hole size, which filters symbionts by size...
March 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28339973/day-to-day-variability-in-self-reported-cigarettes-per-day
#13
John R Hughes, Saul Shiffman, Shelly Naud, Erica N Peters
Background and Aims: Nicotine addiction theory predicts small day to day variability in cigarettes/day (CPD) whereas social learning theory predicts large variability. A description of the variability in CPD over multiple days is not available. Methods: We conducted secondary analyses of two natural history studies with daily smokers - one of smokers not intending to quit, and one of smokers intending to quit sometime in the next 3 months. In the former, smokers recorded their smoking during the day by Ecological Momentary Assessment, using a palm-top computer...
March 4, 2017: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
https://www.readbyqxmd.com/read/28289263/fast-killing-parasites-can-be-favoured-in-spatially-structured-populations
#14
Helen C Leggett, Geoff Wild, Stuart A West, Angus Buckling
It is becoming increasingly clear that the evolution of infectious disease is influenced by host population structure. Theory predicts that parasites should be more 'prudent'-less transmissible-in spatially structured host populations. However, here we (i) highlight how low transmission, the phenotype being selected for in this in context, may also be achieved by rapacious host exploitation, if fast host exploitation confers a local, within-host competitive advantage and (ii) test this novel concept in a bacteria-virus system...
May 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28285464/shodagor-family-strategies-balancing-work-and-family-on-the-water
#15
Kathrine E Starkweather
The Shodagor of Matlab, Bangladesh, are a seminomadic community of people who live and work on small wooden boats, within the extensive system of rivers and canals that traverse the country. This unique ecology places particular constraints on family and economic life and leads to Shodagor parents employing one of four distinct strategies to balance childcare and provisioning needs. The purpose of this paper is to understand the conditions that lead a family to choose one strategy over another by testing predictions about socioecological factors that impact the sexual division of labor, including a family's stage in the domestic cycle, aspects of the local ecology, and the availability of alloparents...
March 11, 2017: Human Nature: An Interdisciplinary Biosocial Perspective
https://www.readbyqxmd.com/read/28279937/can-nutrient-pathways-and-biotic-interactions-control-eutrophication-in-riverine-ecosystems-evidence-from-a-model-driven-mesocosm-experiment
#16
Christoph G Jäger, Jeske Hagemann, Dietrich Borchardt
Ecological theory predicts that the relative importance of benthic to planktonic primary production usually changes along the rivers' continuum from a predomination of benthic algae in lower stream orders to a predomination of planktonic algae at higher orders. Underlying mechanisms driving the interaction between algae in these habitats, its controlling factors and consequences for riverine ecosystems are, however, only partly understood. We present a mechanistic analysis of the governing ecological processes using a simplified, numerical model and examine how abiotic factors and biotic interactions influence benthic and planktonic algae by changing resource competition...
February 27, 2017: Water Research
https://www.readbyqxmd.com/read/28276582/ecological-factors-in-human-development
#17
William E Cross
Urie Bronfenbrenner (1992) helped developmental psychologists comprehend and define "context" as a rich, thick multidimensional construct. His ecological systems theory consists of five layers, and within each layer are developmental processes unique to each layer. The four articles in this section limit the exploration of context to the three innermost systems: the individual plus micro- and macrolayers. Rather than examine both the physical features and processes, the articles tend to focus solely on processes associated with a niche...
March 9, 2017: Child Development
https://www.readbyqxmd.com/read/28262485/recent-visual-experience-shapes-visual-processing-in-rats-through-stimulus-specific-adaptation-and-response-enhancement
#18
Kasper Vinken, Rufin Vogels, Hans Op de Beeck
From an ecological point of view, it is generally suggested that the main goal of vision in rats and mice is navigation and (aerial) predator evasion [1-3]. The latter requires fast and accurate detection of a change in the visual environment. An outstanding question is whether there are mechanisms in the rodent visual system that would support and facilitate visual change detection. An experimental protocol frequently used to investigate change detection in humans is the oddball paradigm, in which a rare, unexpected stimulus is presented in a train of stimulus repetitions [4]...
March 20, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28242201/examining-the-role-of-individual-movement-in-promoting-coexistence-in-a-spatially-explicit-prisoner-s-dilemma
#19
Andrew E F Burgess, Tommaso Lorenzi, Pietà G Schofield, Stephen F Hubbard, Mark A J Chaplain
The emergence of cooperation is a major conundrum of evolutionary biology. To unravel this evolutionary riddle, several models have been developed within the theoretical framework of spatial game theory, focussing on the interactions between two general classes of player, "cooperators" and "defectors". Generally, explicit movement in the spatial domain is not considered in these models, with strategies moving via imitation or through colonisation of neighbouring sites. We present here a spatially explicit stochastic individual-based model in which pure cooperators and defectors undergo random motion via diffusion and also chemotaxis guided by the gradient of a semiochemical...
February 27, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28223529/social-ecological-network-analysis-of-scale-mismatches-in-estuary-watershed-restoration
#20
Jesse S Sayles, Jacopo A Baggio
Resource management boundaries seldom align with environmental systems, which can lead to social and ecological problems. Mapping and analyzing how resource management organizations in different areas collaborate can provide vital information to help overcome such misalignment. Few quantitative approaches exist, however, to analyze social collaborations alongside environmental patterns, especially among local and regional organizations (i.e., in multilevel governance settings). This paper develops and applies such an approach using social-ecological network analysis (SENA), which considers relationships among and between social and ecological units...
March 7, 2017: Proceedings of the National Academy of Sciences of the United States of America
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