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Ecological systems theory

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https://www.readbyqxmd.com/read/28812691/a-macroecological-theory-of-microbial-biodiversity
#1
William R Shoemaker, Kenneth J Locey, Jay T Lennon
Microorganisms are the most abundant, diverse and functionally important organisms on Earth. Over the past decade, microbial ecologists have produced the largest ever community datasets. However, these data are rarely used to uncover law-like patterns of commonness and rarity, test theories of biodiversity, or explore unifying explanations for the structure of microbial communities. Using a global scale compilation of >20,000 samples from environmental, engineered and host-related ecosystems, we test the power of competing theories to predict distributions of microbial abundance and diversity-abundance scaling laws...
April 3, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812678/the-multilayer-nature-of-ecological-networks
#2
Shai Pilosof, Mason A Porter, Mercedes Pascual, Sonia Kéfi
Although networks provide a powerful approach to study a large variety of ecological systems, their formulation does not typically account for multiple interaction types, interactions that vary in space and time, and interconnected systems such as networks of networks. The emergent field of 'multilayer networks' provides a natural framework for extending analyses of ecological systems to include such multiple layers of complexity, as it specifically allows one to differentiate and model 'intralayer' and 'interlayer' connectivity...
March 23, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812672/rapid-and-direct-recoveries-of-predators-and-prey-through-synchronized-ecosystem-management
#3
Jameal F Samhouri, Adrian C Stier, Shannon M Hennessey, Mark Novak, Benjamin S Halpern, Phillip S Levin
One of the twenty-first century's greatest environmental challenges is to recover and restore species, habitats and ecosystems. The decision about how to initiate restoration is best-informed by an understanding of the linkages between ecosystem components and, given these linkages, an appreciation of the consequences of choosing to recover one ecosystem component before another. However, it remains difficult to predict how the sequence of species' recoveries within food webs influences the speed and trajectory of restoration, and what that means for human well-being...
March 1, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28806928/colour-polymorphic-lures-exploit-innate-preferences-for-spectral-versus-luminance-cues-in-dipteran-prey
#4
Thomas E White, Darrell J Kemp
BACKGROUND: Theory predicts that colour polymorphism may be favored by variation in the visual context under which signals are perceived. The context encompasses all environmental determinants of light availability and propagation, but also the dynamics of perception in receivers. Color vision involves the neural separation of information into spectral versus luminance channels, which often differentially guide specific tasks. Here we explicitly tested whether this discrete perceptual basis contributes to the maintenance of polymorphism in a prey-luring system...
August 14, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28740492/patterns-of-early-life-gut-microbial-colonization-during-human-immune-development-an-ecological-perspective
#5
REVIEW
Isabelle Laforest-Lapointe, Marie-Claire Arrieta
Alterations in gut microbial colonization during early life have been reported in infants that later developed asthma, allergies, type 1 diabetes, as well as in inflammatory bowel disease patients, previous to disease flares. Mechanistic studies in animal models have established that microbial alterations influence disease pathogenesis via changes in immune system maturation. Strong evidence points to the presence of a window of opportunity in early life, during which changes in gut microbial colonization can result in immune dysregulation that predisposes susceptible hosts to disease...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28734593/unifying-research-on-social-ecological-resilience-and-collapse
#6
REVIEW
Graeme S Cumming, Garry D Peterson
Ecosystems influence human societies, leading people to manage ecosystems for human benefit. Poor environmental management can lead to reduced ecological resilience and social-ecological collapse. We review research on resilience and collapse across different systems and propose a unifying social-ecological framework based on (i) a clear definition of system identity; (ii) the use of quantitative thresholds to define collapse; (iii) relating collapse processes to system structure; and (iv) explicit comparison of alternative hypotheses and models of collapse...
July 19, 2017: Trends in Ecology & Evolution
https://www.readbyqxmd.com/read/28730353/an-exploration-into-the-bacterial-community-under-different-pasteurization-conditions-during-substrate-preparation-composting-phase-ii-for-agaricus-bisporus-cultivation
#7
Fabricio Rocha Vieira, John Andrew Pecchia
Substrate preparation (i.e., composting) for Agaricus bisporus cultivation is the most critical point of mushroom production. Among many factors involved in the composting process, the microbial ecology of the system is the underlying drive of composting and can be influenced by composting management techniques. Pasteurization temperature at the beginning of phase II, in theory, may influence the bacterial community and subsequently the "selectivity" and nutrition of the final substrate. Therefore, this hypothesis was tested by simulation in bioreactors under different pasteurization conditions (57 °C/6 h, 60 °C/2 h, and 68 °C/2 h), simulating conditions adopted by many producers...
July 20, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28726443/contextualizing-risk-and-protection-perceptions-of-bedouin-mothers-from-unrecognized-villages-in-the-naqab
#8
Ibtisam Marey-Sarwan, Dorit Roer-Strier, Hiltrud Otto
This qualitative study utilizes ecological theory, a context-informed perspective, and an interactive model to study minority children, while considering structural factors, oppression, segregation, power dynamics, and awareness of the political context. It examines perceptions of risk and protection using "snowball" sampling of 33 Bedouin mothers, citizens of Israel, from the unrecognized villages (UVs) in the Naqab in Southern Israel. Data were collected via in-depth, semistructured interviews during 2011 to 2013...
July 20, 2017: American Journal of Orthopsychiatry
https://www.readbyqxmd.com/read/28719737/a-novel-framework-for-analyzing-conservation-impacts-evaluation-theory-and-marine-protected-areas
#9
REVIEW
Michael B Mascia, Helen E Fox, Louise Glew, Gabby N Ahmadia, Arun Agrawal, Megan Barnes, Xavier Basurto, Ian Craigie, Emily Darling, Jonas Geldmann, David Gill, Susie Holst Rice, Olaf P Jensen, Sarah E Lester, Patrick McConney, Peter J Mumby, Mateja Nenadovic, John E Parks, Robert S Pomeroy, Alan T White
Environmental conservation initiatives, including marine protected areas (MPAs), have proliferated in recent decades. Designed to conserve marine biodiversity, many MPAs also seek to foster sustainable development. As is the case for many other environmental policies and programs, the impacts of MPAs are poorly understood. Social-ecological systems, impact evaluation, and common-pool resource governance are three complementary scientific frameworks for documenting and explaining the ecological and social impacts of conservation interventions...
July 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28708004/psychological-trait-resilience-within-ecological-systems-theory-the-resilient-systems-scales
#10
John Maltby, Liz Day, Heather D Flowe, Panos Vostanis, Sally Chivers
This project describes the development of the Resilient Systems Scales, created to address conceptual and methodological ambiguities in assessing the ecological systems model of resilience. Across a number of samples (total N = 986), our findings suggest that the Resilient Systems Scales show equivalence to a previously reported assessment (Maltby, Day, & Hall, 2015 ) in demonstrating the same factor structure, adequate intercorrelation between the 2 measures of resilience, and equivalent associations with personality and well-being...
July 14, 2017: Journal of Personality Assessment
https://www.readbyqxmd.com/read/28706465/disability-and-the-family-in-south-wales-coalfield-society-c-1920-1939
#11
Ben Curtis, Steven Thompson
This article utilises the south Wales coalfield in the interwar period as a case study to illustrate the applicability of two sociological theories - family systems theory and the social ecology of the family - to impairment in the past. It demonstrates that a theoretically-informed approach can help to situate impairment in its particular contexts, most especially the family and the community, and give a better sense of the lived experience of disability. It also demonstrates the complexity of the experience of disability as the family and economic circumstances of each impaired individual varied and led to different forms of care-giving or the utilisation of different sources of support...
January 2, 2017: Family & Community History: Journal of the Family and Community Historical Research Society
https://www.readbyqxmd.com/read/28684284/adaptive-evolution-of-body-size-subject-to-indirect-effect-in-trophic-cascade-system
#12
Xin Wang, Meng Fan, Lina Hao
Trophic cascades represent a classic example of indirect effect and are wide-spread in nature. Their ecological impact are well established, but the evolutionary consequences have received even less theoretical attention. We theoretically and numerically investigate the trait (i.e., body size of consumer) evolution in response to indirect effect in a trophic cascade system. By applying the quantitative trait evolutionary theory and the adaptive dynamic theory, we formulate and explore two different types of eco-evolutionary resource-consumer-predator trophic cascade model...
July 3, 2017: Bio Systems
https://www.readbyqxmd.com/read/28662450/dynamics-and-ecological-risk-assessment-of-chromophoric-dissolved-organic-matter-in-the-yinma-river-watershed-rivers-reservoirs-and-urban-waters
#13
Sijia Li, Jiquan Zhang, Enliang Guo, Feng Zhang, Qiyun Ma, Guangyi Mu
The extensive use of a geographic information system (GIS) and remote sensing in ecological risk assessment from a spatiotemporal perspective complements ecological environment management. Chromophoric dissolved organic matter (CDOM), which is a complex mixture of organic matter that can be estimated via remote sensing, carries and produces carcinogenic disinfection by-products and organic pollutants in various aquatic environments. This paper reports the first ecological risk assessment, which was conducted in 2016, of CDOM in the Yinma River watershed including riverine waters, reservoir waters, and urban waters...
June 26, 2017: Environmental Research
https://www.readbyqxmd.com/read/28650266/disease-suppressive-soils-new-insights-from-the-soil-microbiome
#14
Daniel Schlatter, Linda L Kinkel, Linda S Thomashow, David M Weller, Timothy Carl Paulitz
Soils suppressive to soilborne pathogens have been identified world-wide for almost 60 years and attributed mainly to suppressive or antagonistic microorganisms. Rather than identifying, testing and applying potential biocontrol agents in an inundative fashion, research into suppressive soils has attempted to understand how indigenous microbiomes can reduce disease, even in the presence of the pathogen, susceptible host, and favorable environment. Recent advances in next-generation sequencing of microbiomes have provided new tools to reexamine and further characterize the nature of these soils...
June 26, 2017: Phytopathology
https://www.readbyqxmd.com/read/28649968/real-time-polymer-nanocomposites-based-physical-nanosensors-theory-and-modeling
#15
Stefano Bellucci, Yuri Shunin, Victor Gopeyenko, Tamara Lobanova-Shunina, Nataly Burlutskaya, Yuri Zhukovskii
Functionalized carbon nanotubes and graphene nanoribbons nanostructures, serving as the basis for the creation of physical pressure and temperature nanosensors, are considered as tools for ecological monitoring and medical applications. Fragments of nanocarbon inclusions with different morphologies, presenting a disordered system, are regarded as models for nanocomposite materials based on carbon nanoсluster suspension in dielectric polymer environments (e.g., epoxy resins). We have formulated the approach of conductivity calculations for carbon-based polymer nanocomposites using the effective media cluster approach, disordered systems theory and conductivity mechanisms analysis, and obtained the calibration dependences...
June 26, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28649945/how-noise-and-coupling-influence-leading-indicators-of-population-extinction-in-a-spatially-extended-ecological-system
#16
Suzanne M O'Regan
Anticipating critical transitions in spatially extended systems is a key topic of interest to ecologists. Gradually declining metapopulations are an important example of a spatially extended biological system that may exhibit a critical transition. Theory for spatially extended systems approaching extinction that accounts for environmental stochasticity and coupling is currently lacking. Here, we develop spatially implicit two-patch models with additive and multiplicative forms of environmental stochasticity that are slowly forced through population collapse, through changing environmental conditions...
June 25, 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28648696/integrating-behaviour-into-the-pace-of-life-continuum-divergent-levels-of-activity-and-information-gathering-in-fast-and-slow-living-snakes
#17
Eric J Gangloff, Melinda Chow, Vianey Leos-Barajas, Stephanie Hynes, Brooke Hobbs, Amanda M Sparkman
An animal's life history, physiology, and behaviour can be shaped by selection in a manner that favours strong associations among these aspects of an integrated phenotype. Recent work combining animal personality and life-history theory proposes that animals with faster life-history strategies (i.e., fast growth, high annual reproductive rate, short lifespan) should exhibit higher general activity levels relative to those with slower life-history strategies, but empirical tests of within-species variation in these traits are lacking...
June 23, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28637849/breaking-out-of-the-comfort-zone-el-ni%C3%A3-o-southern-oscillation-as-a-driver-of-trophic-flows-in-a-benthic-consumer-of-the-humboldt-current-ecosystem
#18
José M Riascos, Marco A Solís, Aldo S Pacheco, Manuel Ballesteros
The trophic flow of a species is considered a characteristic trait reflecting its trophic position and function in the ecosystem and its interaction with the environment. However, climate patterns are changing and we ignore how patterns of trophic flow are being affected. In the Humboldt Current ecosystem, arguably one of the most productive marine systems, El Niño-Southern Oscillation is the main source of interannual and longer-term variability. To assess the effect of this variability on trophic flow we built a 16-year series of mass-specific somatic production rate (P/B) of the Peruvian scallop (Argopecten purpuratus), a species belonging to a former tropical fauna that thrived in this cold ecosystem...
June 28, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28633194/moving-forward-in-circles-challenges-and-opportunities-in-modelling-population-cycles
#19
REVIEW
Frédéric Barraquand, Stilianos Louca, Karen C Abbott, Christina A Cobbold, Flora Cordoleani, Donald L DeAngelis, Bret D Elderd, Jeremy W Fox, Priscilla Greenwood, Frank M Hilker, Dennis L Murray, Christopher R Stieha, Rachel A Taylor, Kelsey Vitense, Gail S K Wolkowicz, Rebecca C Tyson
Population cycling is a widespread phenomenon, observed across a multitude of taxa in both laboratory and natural conditions. Historically, the theory associated with population cycles was tightly linked to pairwise consumer-resource interactions and studied via deterministic models, but current empirical and theoretical research reveals a much richer basis for ecological cycles. Stochasticity and seasonality can modulate or create cyclic behaviour in non-intuitive ways, the high-dimensionality in ecological systems can profoundly influence cycling, and so can demographic structure and eco-evolutionary dynamics...
June 20, 2017: Ecology Letters
https://www.readbyqxmd.com/read/28618174/intraspecific-maternal-competition-induces-summer-diapause-in-insect-parasitoids
#20
Kevin Tougeron, George Hraoui, Cécile Le Lann, Joan van Baaren, Jacques Brodeur
Organisms often live in unpredictable environments and have to adopt life history strategies that optimize their fitness under these conditions. According to bet-hedging theory, individuals can reduce variation in fitness outcomes by investing in different strategies at the same time. For arthropods, facultative summer diapause enables survival during dry and hot periods of the year, and can be triggered by a decrease in resource abundance. However, the effect of resource depletion on diapause induction has never been disentangled from the effect of the perception of the presence of competitors...
June 15, 2017: Insect Science
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