scholarly journals High and dry: Trade-off in arboreal calling in a treefrog mediated by local environment

2019 ◽  
Author(s):  
Amanda S Cicchino ◽  
Nicholas A Cairns ◽  
Grégory Bulté ◽  
Stephen C Lougheed
Keyword(s):  
Environmental Conditions ◽  
Ground Cover ◽  
Local Environment ◽  
Environmental Data ◽  
Calling Behavior ◽  
Vegetation Density ◽  
Trade Off ◽  
Trade Offs ◽  
Mating Call ◽  
The Cost

Abstract Trade-offs shaping behavioral variation are often influenced by the environment. We investigated the role that the environment plays in mediating trade-offs using a widespread frog with a conspicuous mating display, Pseudacris crucifer. We first demonstrated, using playback and desiccation experiments, that calling site selection involves a trade-off between sound transmission and desiccation. We then determined the influence of local environmental conditions on the intensity of the trade-off by examining range-wide behavioral and environmental data. We showed that the benefit of improved call transmission is positively influenced by vegetation density and ground cover. Behavioral data are consistent with this relationship: sites with a greater transmission benefit have increased prevalence of arboreally calling males. We also found that the prevalence of arboreal calling behavior increases with relative humidity and air temperature, suggesting an influence of these environmental variables on the desiccation cost of arboreal calling. This study provides a clear example of the role of the environment in mediating trade-off intensities and shaping critical behavioral traits. Local environment mediates the intensity of a trade-off associated with arboreal calling behavior in a treefrog. Combining observational and experimental approaches, we show that arboreal calling behavior increases the transmission of a mating call while potentially subjecting individuals to a rate of desiccation six times greater than terrestrial calling. Local environmental conditions influence both the benefit and the cost of this trade-off, subjecting different populations to varying trade-off intensities and shaping arboreal calling behavior.

scholarly journals Using Artificial Intelligence to classify Jobseekers: The Accuracy-Equity Trade-off

2020 ◽  
pp. 1-19
Author(s):  
SAM DESIERE ◽  
LUDO STRUYVEN
Keyword(s):  
Artificial Intelligence ◽  
Maximum Level ◽  
Employment Services ◽  
Trade Off ◽  
The Public ◽  
Foreign Origin ◽  
Trade Offs ◽  
Graphical Tool ◽  
The Cost

Abstract Artificial intelligence (AI) is increasingly popular in the public sector to improve the cost-efficiency of service delivery. One example is AI-based profiling models in public employment services (PES), which predict a jobseeker’s probability of finding work and are used to segment jobseekers in groups. Profiling models hold the potential to improve identification of jobseekers at-risk of becoming long-term unemployed, but also induce discrimination. Using a recently developed AI-based profiling model of the Flemish PES, we assess to what extent AI-based profiling ‘discriminates’ against jobseekers of foreign origin compared to traditional rule-based profiling approaches. At a maximum level of accuracy, jobseekers of foreign origin who ultimately find a job are 2.6 times more likely to be misclassified as ‘high-risk’ jobseekers. We argue that it is critical that policymakers and caseworkers understand the inherent trade-offs of profiling models, and consider the limitations when integrating these models in daily operations. We develop a graphical tool to visualize the accuracy-equity trade-off in order to facilitate policy discussions.

scholarly journals Warmer temperatures attenuate the classic offspring number and reproductive investment trade-off in the common lizard, Zootoca vivipara

2016 ◽  
Vol 12 (6) ◽  
pp. 20160101 ◽  
Author(s):  
Alexis Rutschmann ◽  
Donald B. Miles ◽  
Jean Clobert ◽  
Murielle Richard
Keyword(s):  
Life History ◽  
Environmental Conditions ◽  
Life History Traits ◽  
Natural Populations ◽  
Trade Off ◽  
Offspring Number ◽  
Common Lizard ◽  
Trade Offs ◽  
Zootoca Vivipara ◽  
The Common

Life-history traits involved in trade-offs are known to vary with environmental conditions. Here, we evaluate the response of the trade-off between ‘offspring number’ versus ‘energy invested per offspring’ to ambient temperature in 11 natural populations of the common lizard, Zootoca vivipara . We provide evidence at both the intra- and interpopulation levels that the trade-off is reduced with an increase in air temperature. If this effect enhances current individual fitness, it may lead to an accelerated pace of life in warmer environments and could ultimately increase adult mortality. In the context of global warming, our results advocate the need for more studies in natural populations to explore interactions between life-history traits' trade-offs and environmental conditions.

scholarly journals Optimal maintenance scheduling for local public purpose buildings

2016 ◽  
Vol 34 (2) ◽  
pp. 120-135 ◽  
Author(s):  
Arnt O. Hopland ◽  
Sturla F. Kvamsdal
Keyword(s):  
Local Governments ◽  
Formal Model ◽  
Maintenance Scheduling ◽  
Trade Off ◽  
Content Type ◽  
Maintenance Schedule ◽  
Public Purpose ◽  
Trade Offs ◽  
Optimal Maintenance ◽  
The Cost

Purpose – The purpose of this paper is to set up and analyze a formal model for maintenance scheduling for local government purpose buildings. Design/methodology/approach – The authors formulate the maintenance scheduling decision as a dynamic optimization problem, subject to an accelerating decay. This approach offers a formal, yet intuitive, weighting of an important trade-off when deciding a maintenance schedule. Findings – The optimal maintenance schedule reflects a trade-off between the interest rate and the rate at which the decay accelerates. The prior reflects the alternative cost, since the money spent on maintenance could be saved and earn interests, while the latter reflects the cost of postponing maintenance. Importantly, it turns out that it is sub-optimal to have a cyclical maintenance schedule where the building is allowed to decay and then be intensively maintained before decaying again. Rather, local governments should focus the maintenance either early in the building’s life-span and eventually let it decay toward replacement/abandonment or first let it decay to a target level and then keep it there until replacement/abandonment. Which of the two is optimal depends on the trade-off between the alternative cost and the cost of postponing maintenance. Originality/value – The paper provides a first formal inquiry into important trade-offs that are important for maintenance scheduling of local public purpose buildings.

Exploring the Culture of Surveillance: A Qualitative Study in Portugal

2021 ◽  
Vol 10 (1) ◽  
pp. 79-95
Author(s):  
Délcio Faustino ◽  
Maria João Simões
Keyword(s):  
Qualitative Study ◽  
Detailed Analysis ◽  
Social Inequalities ◽  
Cost Benefit ◽  
Theoretical Framework ◽  
Surveillance Culture ◽  
Trade Off ◽  
Trade Offs ◽  
The Cost ◽  
Subjective Meanings

By following the theoretical framework of the surveillance culture this article aims to detail the surveillance imaginaries and practices that individuals have, capturing differences and social inequalities among respondents. We present an in-depth look into surveillance awareness, exploring subjective meanings and the varying awareness regarding commercial, governmental, and lateral surveillance. Furthermore, a detailed analysis is made on how individuals sometimes welcome surveillance, expanding on the cost-benefit trade-off, and detailing it on three distinct trade-offs: the privacy vs. commercial gains/rewards, the privacy vs. convenience and, the privacy vs. security. Lastly, we present a section that explores and analyzes resistance to surveillance.

scholarly journals Examining the relationships between phenotypic plasticity and local environments with genomic structural equation models

2019 ◽  
Author(s):  
Malachy T. Campbell ◽  
Haipeng Yu ◽  
Mehdi Momen ◽  
Gota Morota
Keyword(s):  
Local Adaptation ◽  
Environmental Conditions ◽  
Structural Equation ◽  
Structural Equation Models ◽  
Common Garden ◽  
Local Environment ◽  
Equation Model ◽  
Environmental Data ◽  
Association Analyses ◽  
Common Qtl

AbstractEnvironmental association analyses (EAA) seek to identify genetic variants associated with local adaptation by regressing local environmental conditions at collection sites on genome-wide polymorphisms. The rationale is that environmental conditions impose selective pressure on trait(s), and these traits are regulated in part by variation at a genomic level. Here, we present an alternative multivariate genomic approach that can be utilized when both phenotypic and environmental data are available for the population. This framework utilizes Bayesian networks (BN) to elucidate interdependancies between local environmental conditions and empirical phenotypes, and jointly estimates the direct and indirect genetic covariances between empirical phenotypes and environmental conditions using a mixed-effects structural equation model (SEM). Direct genomic covariance between empirical phenotypes and environmental conditions may provide insight into whether QTL that affect adaptation to an environmental gradient also affects the observed phenotype. To demonstrate the utility of this approach, we leveraged two existing datasets consisting of 55 climate variables for 1,130 Arabidopsis accessions and empirical phenotypes for fitness and phenology collected on 515 accessions in two common garden locations in Europe. BN showed that plasticity for fitness and phenology was highly dependant on local environmental conditions. Moreover, genomic SEM revealed relatively high positive genomic correlation between plasticity in fitness and environmental variables that describe the favorability of the local environment for plant growth, indicating the presence of common QTL or independent QTL that are tightly linked. We believe the frameworks presented in this manuscript can provide new insights into the genetic basis of local adaptation.

Optimizing the cost, LEED credits, and time trade-offs using a genetic algorithmic model

2020 ◽  
Vol 47 (5) ◽  
pp. 596-608
Author(s):  
Shantanu Kumar ◽  
Mohammed S. Hashem M. Mehany
Keyword(s):  
Construction Projects ◽  
Time Budget ◽  
Study Data ◽  
Trade Off ◽  
Trade Offs ◽  
Dataset Size ◽  
Preliminary Study ◽  
Algorithmic Model ◽  
The Cost

Over the last century, the complexity of construction projects has increased exponentially and its factors (e.g., time, budget, and quality) have generated complicated trade-offs. This research focuses on the trade-off between time, cost, and sustainability represented in Leadership in Energy and Environmental Design (LEED) credits (particularly materials and resources). The research is broken into preliminary and validation studies wherein the preliminary study uses an exhaustive search to find the optimized solution. In the validation case study, dataset size increased exponentially, and it became computationally incompatible to find the optimized solution. Genetic algorithm (GA) is used to find the optimized solution based on user-defined priority factors. Usage of GA is validated using the preliminary study data and then applied to the validation study data. A trade-off is seen between the priority factors and the optimized solution. The optimization model is successful in minimizing the time and cost, concurrently maximizing the points associated with LEED credits for a validation case study.

scholarly journals How evolution draws trade-offs

2017 ◽  
Author(s):  
Salomé Bourg ◽  
Laurent Jacob ◽  
Frédéric Menu ◽  
Etienne Rajon
Keyword(s):  
Physiological Mechanism ◽  
Physiological Mechanisms ◽  
Trade Off ◽  
Trade Offs ◽  
Genetic Level ◽  
Resource Storage ◽  
Combined Action ◽  
Frame Work ◽  
Classical Image ◽  
The Cost

Recent empirical evidence suggest that trade-off shapes can evolve, challenging the classical image of their high entrenchment. Here we model the evolution of the physiological mechanism that controls the allocation of a resource to two traits, by mutating the expression and the conformation of its constitutive hormones and receptors. We show that trade-off shapes do indeed evolve in this model through the combined action of genetic drift and selection, such that their evolutionarily expected curvature and length depend on context. In particular, a trade-off’s shape should depend on the cost associated with the resource storage, itself depending on the traded resource and on the ecological context. Despite this convergence at the phenotypic level, we show that a variety of physiological mechanisms may evolve in similar simulations, suggesting redundancy at the genetic level. This model should provide a useful frame-work to interpret and link the overly complex observations of evolutionary endocrinology and evo-lutionary ecology.

scholarly journals The possible fidelity-speed-proofreading cost trade-offs in DNA replication due to the exonuclease proofreading

2021 ◽  
Author(s):  
Qiu-Shi Li ◽  
Yao-Gen Shu ◽  
Wen-Bo Fu ◽  
Zhong-Can Ou-Yang ◽  
Ming Li
Keyword(s):  
Dna Replication ◽  
High Fidelity ◽  
Trade Off ◽  
Slowing Down ◽  
Polymerase Domain ◽  
Trade Offs ◽  
New Perspective ◽  
The Cost ◽  
Kinetic Proofreading ◽  
Hydrolysis Of

DNA replication is a high-fidelity information-copying processes which is realized by DNA polymerase (DNAP). The high fidelity was explained on the basis of the well-known kinetic-proofreading mechanism (KPR), under which the so-called fidelity-speed trade-off was studied theoretically. However, numerous biochemical experiments have shown that the high fidelity of DNA replication is achieved due to the initial discrimination of polymerase domain of DNAP, as well as the proofreading of the exonuclease domain of DNAP. This exonuclease-proofreading mechanism (EPR) is totally different from KPR. So the trade-off issues are worth being re-examined under EPR. In this paper, we use the first-passage method recently proposed by us to discuss the possible trade-offs in DNA replication under EPR. We show that there could be no fidelity-speed trade-off under EPR, i.e., the fidelity and the speed can be simultaneously enhanced by EPR in a large range of kinetic parameters. This provides a new perspective to understand the experimental data of the exonuclease activity of T7 DNAP and T4 DNAP. We also show that there exists the fidelity-proofreading cost trade-off, i.e., the fidelity is enhanced at the cost of increasing the futile hydrolysis of dNTP. A possible way to avoid this trade-off is to regulate the rate of DNAP translocation: slowing down the forward translocation (in the presence of the terminal mismatch) can enhance the fidelity without changing the speed and the proofreading cost. Our theoretical analysis offers deeper insights on the kinetics-function relation of DNAP.PACS numbers: 82.39.-k, 87.15.Rn, 87.16.A-

scholarly journals On the Cost-Effective Design of Agglomeration Bonus Schemes for the Conservation of Multiple Competing Species

2021 ◽  
Vol 9 ◽  
Author(s):  
Martin Drechsler
Keyword(s):  
Financial Incentives ◽  
Cost Effective ◽  
Spatial Arrangement ◽  
Species Traits ◽  
Competing Species ◽  
Trade Off ◽  
Conservation Measures ◽  
Trade Offs ◽  
The Cost ◽  
Agglomeration Bonus

An important mechanism of species co-existence in spatially structured landscapes is the competition-colonisation trade-off which states that co-existence of competing species is possible if, all other things equal, the better competitor is the worse coloniser. The effectiveness of this trade-off for the facilitation of co-existence, however, is likely to depend on the spatial arrangement of the habitat, because too strong agglomeration of the habitat may overly benefit the strong competitor (being the poor disperser), implying extinction of the inferiour competitor, while too much dispersion of the habitat may drive the superiour competitor (being the inferiour coloniser) to extinction. In working landscapes, biodiversity conservation is often induced through conservation payments that offset the forgone profits incurred by the conservation measure. To control the spatial arrangement of conservation measures and habitats in a conservation payment scheme, the agglomeration bonus has been proposed to provide financial incentives for allocating conservation measures in the vicinity of other sites with conservation measures. This paper presents a generic spatially explicit ecological-economic simulation model to explore the ability of the agglomeration bonus to cost-effectively conserve multiple competing species that differ by their competition strengths, their colonisation rates and their dispersal ranges. The interacting effects of the agglomeration bonus and different species traits and their trade-offs on the species richness in the model landscape are analysed. Recommendations for the biodiversity-maximising design of agglomeration bonus schemes are derived.

A Basic Income Trilemma: Affordability, Adequacy, and the Advantages of Radically Simplified Welfare

2019 ◽  
Vol 49 (3) ◽  
pp. 461-482 ◽  
Author(s):  
LUKE MARTINELLI
Keyword(s):  
Conceptual Framework ◽  
Policy Design ◽  
Policy Agenda ◽  
Basic Income ◽  
Trade Off ◽  
Means Testing ◽  
Trade Offs ◽  
Common Objection ◽  
The Uk ◽  
The Cost

AbstractAs basic income (BI) has ascended the policy agenda, so proposals have come under increasing scrutiny for their affordability and adequacy for meeting need. One common objection to BI has been that it is impossible to design a scheme that simultaneously conforms to these two criteria. In this article, I develop a conceptual framework for analysing the trade-offs that afflict BI policy design. I suggest that while the idea of a policy dilemma between affordability and adequacy does indeed afflict ‘full’ BI schemes, it is possible to design an affordable and adequate ‘partial’ BI scheme. However, this comes at the cost of (at least partly) forfeiting some key advantages that motivate interest in BI in the first place, since these only arise as a consequence of the elimination of means testing and related conditionality from the welfare system. Thus, BI proponents face a three-way trade-off in policy design between affordability, adequacy, and securing the full advantages of BI as a radical simplification of existing welfare policy. The trilemma is illustrated with reference to original microsimulation evidence for the UK, which demonstrates that at most two of the three criteria can be achieved in a single scheme.

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