scholarly journals The role of fluvial sediment supply and river-mouth hydrology in the dynamics of the muddy, Amazon-dominated Amapá–Guianas coast, South America: A three-point research agenda

2013 ◽  
Vol 44 ◽  
pp. 18-24 ◽  
Author(s):  
Edward J. Anthony ◽  
Antoine Gardel ◽  
Christophe Proisy ◽  
François Fromard ◽  
Erwan Gensac ◽  
...  
Keyword(s):  
South America ◽  
Research Agenda ◽  
River Mouth ◽  
Sediment Supply ◽  
Fluvial Sediment

Sediment retention in river deltas and feedbacks with delta morphology

2021 ◽  
Author(s):  
Jaap Nienhuis ◽  
Juan Paniagua-Arroyave ◽  
Frances Dunn ◽  
Sagy Cohen ◽  
Torbjorn Tornqvist
Keyword(s):  
River Mouth ◽  
Sediment Traps ◽  
Sediment Supply ◽  
Sediment Retention ◽  
Sediment Delivery ◽  
Cross Sectional ◽  
Fluvial Sediment ◽  
River Deltas ◽  
Sediment Loads ◽  
The Mean

<p>Fluvial sediments have collectively formed about 900,000 km<sup>2</sup> of deltaic land since Holocene sea-level rise slowed down. The rate at which deltas have retained fluvial sediment to build deltaic land, however, has varied greatly between different deltas. Here we quantify sediment retention in the delta topset and foreset for 3,556 deltas globally. We estimate retention from data on delta morphology and cross-sectional area, combined with WBMSed data on fluvial suspended sediment supply. Deltas, on average, retain 25±2% (standard error of the mean) of the fluvial sediment in their topset and 31±2% in their foreset. Because topset sediment retention reduces the sediment delivery to the river mouth, it sets up a feedback with processes that build delta morphology. Waves reduce topset sediment retention whereas tides increase it. Tide dominated deltas retain 61±24% on their topset, on average, compared to 21±3% and 24±2% for river- and wave-dominated deltas, respectively. Larger deltas trap more sediment, but not in comparison to their larger sediment loads, making them relatively inefficient sediment traps.</p>

The role of affect in travel risk perception: a new research agenda

2020 ◽  
Author(s):  
I-Chieh Michelle Yang
Keyword(s):  
Risk Perception ◽  
Positive Affect ◽  
Research Agenda ◽  
Tourism Industry ◽  
Psychological Process ◽  
Related Research ◽  
Risk Research ◽  
Conceptual Paper ◽  
New Research

This conceptual paper proposes a new research agenda in travel risk research by understanding the role of affect. Extant scholarship tends to focus on travel risk perception or assessment as a cognitive psychological process. However, despite the phenomenal growth of the tourism industry globally, research related to travel risk perception remains stagnant with no significant breakthrough. Drawing on the existing empirical evidences in risk-related research, this paper asserts that affect plays a potent role in influencing travel risk perception – positive affect leads to more positive travel risk perception, vice versa. In this paper, existing empirical evidences and theories are presented to provide support for this proposition.

scholarly journals EIMECA: A Proposal for a Model of Environmental Collective Action

2021 ◽  
Vol 13 (11) ◽  
pp. 5935
Author(s):  
Beatriz Carmona-Moya ◽  
Antonia Calvo-Salguero ◽  
María-del-Carmen Aguilar-Luzón
Keyword(s):  
Structural Equation Modeling ◽  
Collective Action ◽  
Research Agenda ◽  
Structural Equation ◽  
Equation Modeling ◽  
Environmental Identity ◽  
Group Efficacy ◽  
Action Model ◽  
Identity Model

The deterioration and destruction of the environment is becoming more and more considerable and greater efforts are needed to stop it. To accomplish this feat, all members of society must identify with solving environmental problems, environmental collective action being one of the most relevant means of doing so. From this perspective, the analysis of the psychosocial factors that lead to participation in environmental collective action emerges as a priority objective in the research agenda. Thus, the aim of this study is to examine the role of “environmental identity”, as conceptualized by Clayton, as a central axis for explaining environmental collective action. The inclusion of the latter in the theoretical framework of the SIMCA (social identity model of collective action) model gives rise to the model that we have called EIMECA (environmental identity model of environmental collective action). Two studies were conducted (344 and 720 participants, respectively), and structural equation modeling was used. The results reveal that environmental identity and a variety of negative emotional affects, as well as group efficacy, accompanied by hope for a simultaneous additive effect, are critical when it comes to predicting environmental collective action.

scholarly journals Co-occurrences of tropical trees in eastern South America: disentangling abiotic and biotic forces

Plant Ecology ◽  
2021 ◽  
Author(s):  
Emma-Liina Marjakangas ◽  
Otso Ovaskainen ◽  
Nerea Abrego ◽  
Vidar Grøtan ◽  
Alexandre A. de Oliveira ◽  
...  
Keyword(s):  
South America ◽  
Tree Species ◽  
Large Scale ◽  
Environmental Filtering ◽  
Limiting Similarity ◽  
Phylogenetic Relatedness ◽  
Biogeographical Regions ◽  
Dependent Processes ◽  
Occurrence Of Species

AbstractSpecies co-occurrences in local communities can arise independent or dependent on species’ niches. However, the role of niche-dependent processes has not been thoroughly deciphered when generalized to biogeographical scales, probably due to combined shortcomings of data and methodology. Here, we explored the influence of environmental filtering and limiting similarity, as well as biogeographical processes that relate to the assembly of species’ communities and co-occurrences. We modelled jointly the occurrences and co-occurrences of 1016 tropical tree species with abundance data from inventories of 574 localities in eastern South America. We estimated species co-occurrences as raw and residual associations with models that excluded and included the environmental effects on the species’ co-occurrences, respectively. Raw associations indicate co-occurrence of species, whereas residual associations indicate co-occurrence of species after accounting for shared responses to environment. Generally, the influence of environmental filtering exceeded that of limiting similarity in shaping species’ co-occurrences. The number of raw associations was generally higher than that of the residual associations due to the shared responses of tree species to the environmental covariates. Contrary to what was expected from assuming limiting similarity, phylogenetic relatedness or functional similarity did not limit tree co-occurrences. The proportions of positive and negative residual associations varied greatly across the study area, and we found a significant tendency of some biogeographical regions having higher proportions of negative associations between them, suggesting that large-scale biogeographical processes limit the establishment of trees and consequently their co-occurrences.

scholarly journals How Can Psychological Science Help Counter the Spread of Fake News?

2021 ◽  
Vol 24 ◽  
Author(s):  
Sander van der Linden ◽  
Jon Roozenbeek ◽  
Rakoen Maertens ◽  
Melisa Basol ◽  
Ondřej Kácha ◽  
...  
Keyword(s):  
Research Agenda ◽  
Source Credibility ◽  
Fake News ◽  
Intervention Effectiveness ◽  
Motivated Cognition ◽  
Individual Level ◽  
Psychological Science ◽  
Open Questions ◽  
The Individual

Abstract In recent years, interest in the psychology of fake news has rapidly increased. We outline the various interventions within psychological science aimed at countering the spread of fake news and misinformation online, focusing primarily on corrective (debunking) and pre-emptive (prebunking) approaches. We also offer a research agenda of open questions within the field of psychological science that relate to how and why fake news spreads and how best to counter it: the longevity of intervention effectiveness; the role of sources and source credibility; whether the sharing of fake news is best explained by the motivated cognition or the inattention accounts; and the complexities of developing psychometrically validated instruments to measure how interventions affect susceptibility to fake news at the individual level.

scholarly journals Enhancing Patient Safety by Reducing Healthcare-Associated Infections: The Role of Discovery and Dissemination

2010 ◽  
Vol 31 (2) ◽  
pp. 118-123 ◽  
Author(s):  
Keyword(s):  
Patient Safety ◽  
Healthcare System ◽  
Research Agenda ◽  
Position Paper ◽  
Public Confidence ◽  
Healthcare Associated Infections ◽  
Science Base ◽  
Healthcare Associated ◽  
National Approach

Healthcare-associated infections (HAIs) take a major human toll on society and reduce public confidence in the healthcare system. The current convergence of scientific, public, and legislative interest in reducing rates of HAI can provide the necessary momentum to address and answer important questions in HAI research. This position paper outlines priorities for a national approach to HAIs: scrutinizing the science base, developing a prioritized research agenda, conducting studies that address the questions that have been identified, creating and deploying guidelines that are based on the outcomes of these studies, and then initiating new studies that assess the efficacy of the interventions.

A Yahgan for the killing: murder, memory and Charles Darwin

2011 ◽  
Vol 46 (3) ◽  
pp. 415-443 ◽  
Author(s):  
JOSEPH L. YANNIELLI
Keyword(s):  
South America ◽  
Charles Darwin ◽  
Historical Memory ◽  
Cross Cultural ◽  
Western Coast ◽  
Cultural Interaction ◽  
European Expansion ◽  
Multiple Contexts ◽  
History Of

AbstractIn March 1742, British naval officer John Byron witnessed a murder on the western coast of South America. Both Charles Darwin and Robert FitzRoy seized upon Byron's story a century later, and it continues to play an important role in Darwin scholarship today. This essay investigates the veracity of the murder, its appropriation by various authors, and its false association with the Yahgan people encountered during the second voyage of theBeagle(1831–1836). Darwin's use of the story is examined in multiple contexts, focusing on his relationship with the history of European expansion and cross-cultural interaction and related assumptions about slavery and race. The continuing fascination with Byron's story highlights the key role of historical memory in the development and interpretation of evolutionary theory.

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