scholarly journals Identifying Key Processes and Drivers Affecting the Success of Non-indigenous Marine Species in Coastal Waters

2022 ◽  
Author(s):  
Martin Lindegren ◽  
Aurelia Pereira Gabellini ◽  
Peter Munk ◽  
Karen Edelvang ◽  
Flemming Hansen
Keyword(s):  
Community Assembly ◽  
Coastal Waters ◽  
Conservation Planning ◽  
Marine Conservation ◽  
Indigenous Species ◽  
Negative Consequences ◽  
Joint Modelling ◽  
Key Drivers ◽  
Positive Effect ◽  
Modelling Approach

Abstract Non-indigenous species (NIS) pose a major threat to biodiversity and the functioning and services of ecosystems. Despite their rapid spread in coastal waters worldwide, biotic invasions are widely disregarded in marine conservation planning. To guide conservation actions, a better understanding of the underlying mechanisms determining the success of NIS are therefore needed. Here we develop a joint modelling approach to identify the key drivers and community assembly processes determining the occurrence of invasive benthic invertebrates, using Danish coastal waters as a case study. To reflect factors affecting the introduction, establishment and spread of NIS throughout the area, we compiled long-term monitoring data on NIS, as well as information on commercial shipping, environmental conditions and estimates of larvae settling densities derived from drift model simulations informed by species traits. We then applied a set of species distribution models to identify the key drivers determining the occurrence of NIS. Our results demonstrate a significant positive effect of vessel activity, a negative effect of depth and bottom salinity, as well as a positive effect of the simulated settling densities on the probability of presence. Taken together, our results highlight the role of commercial shipping, habitat characteristics and passive advection of early-life stages on the success of NIS. Our joint modelling approach provide improved process understanding on the key community assembly processes determining the presence of NIS and may serve to guide monitoring, management and conservation planning in order to limit future invasions and their negative consequences on coastal ecosystems.

Incorporating putatively neutral and adaptive genomic data into marine conservation planning

2020 ◽  
Author(s):  
Amanda Xuereb ◽  
Cassidy C. D'Aloia ◽  
Marco Andrello ◽  
Louis Bernatchez ◽  
Marie‐Josée Fortin
Keyword(s):  
Conservation Planning ◽  
Genomic Data ◽  
Marine Conservation

scholarly journals The Influence of Atypical Employment on Socioeconomic Development

2020 ◽  
Vol 16 (1) ◽  
pp. 43-50
Author(s):  
Nikita L. Lyutov
Keyword(s):  
Market Segmentation ◽  
Socioeconomic Development ◽  
Employment Relations ◽  
Negative Consequences ◽  
Labour Law ◽  
Labour Market Segmentation ◽  
The Subject ◽  
Labour Legislation ◽  
Atypical Employment ◽  
Positive Effect

The Subject of the Study. The article deals with an issue of impact of atypical employment on the socioeconomic development on micro- and macro levels. The Purpose of the Study is to discover the links between the introduction of atypical forms of employment and socioeconomic development. The Main Theoretical and Empirical Aspects of Study: as the implementation of various forms of atypical employment is one of the aspects of flexibility in employment relations’ regulation, the author starts with a general analysis of impact of general flexibility of employment on the economy. This section of the article contains the conclusion that a thesis about positive effect of labour law flexibility on the economic effectiveness remains unproven; – the second part of the article contains an analysis of the relations between the specific forms of atypical employment and the state of economy. The conclusion has been made that ill-considered implementation of such forms into the labour legislation leads to such negative consequences to the economy as the labour market segmentation and volatility, rising incomes gap and lowering the purchasing power. – the thesis is made that Russian labour legislation modification in the field of atypical employment development is only acceptable with a view to make the already existing atypical employment come out of informal sector, and in a way that takes into account the interests of both parties of the employment relationship.

scholarly journals MICROALGAE FROM THE COASTAL WATERS OF TYULENY ISLAND IN THE CASPIAN SEA

2019 ◽  
Vol 14 (2) ◽  
pp. 120-131
Author(s):  
R. M. Barkhalov ◽  
A. A. Abdurakhmanova ◽  
F. Sh. Amaeva
Keyword(s):  
Coastal Waters ◽  
Caspian Sea ◽  
Biomass Concentration ◽  
Water Area ◽  
Trophic Chain ◽  
The Caspian Sea ◽  
Standard Procedures ◽  
Water Surface Layer ◽  
Rich Flora ◽  
Positive Effect

Aim. In this work, we set out to study the composition of a phytoplankton community in an important fishery area, the coastal water area of Tyuleny Island in the Caspian Sea.Methods. We present the results of seasonal observations (2016) on the state of phytoplankton in the coastal waters of Tyuleny Island in the Caspian Sea. In total, 120 phytoplankton samples were collected at four stations from the water surface layer (May–October) using the Nansen bottle and subsequent fixation by Lugolʹs solution. Sedimentation and concentration were carried out using standard procedures. The samples were processed in the Nageotte chamber with a volume of 0.1 ml under a light microscope.Results. According to the research results (2016), 103 species and varieties of microalgae were found in the phytoplankton samples collected from the water area of Tyuleny Island. The microalgae were represented by four divisions: Bacillariophyta – 49 species, Cyano‐ phyta – 24 species, Chlorophyta – 23 species and Pyrrophyta – 7 species. The greatest species diversity of phytoplankton in the studied water area was noted during the autumn period (61 spe‐ cies). In general, phytoplankton was found to be distributed homogeneously throughout the coastal area of the island, with the biomass concentration not reaching 1 g/m3.Conclusion. In 2016, favorable hydrological and hydrochemical conditions for the development of microalgae were observed. The desalinated water around Tyuleny Island, which is well warmed in the summer and does not freeze in the winter, contributed to the development of rich flora. Although bi‐ omass values were not high due to the prevalence of small‐celled microalgae in phytoplankton, in general, it should have a positive effect on the development of subsequent links in a trophic chain, as well as promote an increase in the productivity of waters of the Northern Caspian Sea. 

Investigating microblogging addiction tendency through the lens of uses and gratifications theory

2018 ◽  
Vol 28 (5) ◽  
pp. 1228-1252 ◽  
Author(s):  
Qian Li ◽  
Xunhua Guo ◽  
Xue Bai ◽  
Wei Xu
Keyword(s):  
Causal Relationship ◽  
Uses And Gratifications ◽  
Theoretical Perspective ◽  
Research Model ◽  
Negative Consequences ◽  
Psychological Outcome ◽  
Content Type ◽  
Different Types ◽  
Key Drivers ◽  
Practical Implications

Purpose Considering the popularity and addictive attributes of microblogging, the purpose of this paper is to explore the key drivers of the microblogging addiction tendency, and to investigate the causal relationship between microblogging usage and addiction tendency through the lens of the uses and gratifications (U&G) theory. Design/methodology/approach By extending the U&G theory to accommodate the negative consequences of gratification, a research model that explains the relationships among microblogging use, gratification and addiction tendency was developed and empirically examined based on the data collected from 520 microblogging users in China. Findings The results showed that different types of microblogging use lead to different categories of gratification to different extents, while different categories of gratification play different roles in determining the level of addiction tendency. Specifically, the effect of content gratification on addiction is marginal, while social gratification has significant effects on all dimensions of addiction tendency. Originality/value The present study has both theoretical and practical implications. From a theoretical perspective, unlike many previous studies applied the U&G theory to explore the positive outcomes of media uses, this paper extends the U&G by including addiction tendency as a negative psychological outcome of U&G., resulting a research framework (use-gratification-addiction framework). Meanwhile, this paper contributes to the extending literature by examining the constructs of U&G at a granular level and investigated the causal relationship between “uses” and “gratifications.”

Antecedents of smartphone brand switching: a push–pull–mooring framework

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Junyun Liao ◽  
Muhua Li ◽  
Haiying Wei ◽  
Zelin Tong
Keyword(s):  
Structural Equation ◽  
Content Type ◽  
Brand Switching ◽  
Equation Modelling ◽  
Emotional Commitment ◽  
Alternative Attractiveness ◽  
Fierce Competition ◽  
Push Factor ◽  
Positive Effect ◽  
Modelling Approach

PurposeRecent years have witnessed the increasingly fierce competition amongst smartphone brands. Hence, smartphone firms urge to prevent current consumers from switching to maintain market position. Based on the push–pull–mooring (PPM) framework, this study aims to explore the drivers of users' intentions to switch from their current smartphone brands.Design/methodology/approachBased on previous literature and the characteristics of the smartphone purchase, this study identified one pushing, two pulling and five mooring factors. Online questionnaires were collected to test hypotheses using the structural equation modelling approach. An additional netnography study provides further support to the hypotheses.FindingsResults show that regret is a push factor that enhances consumers' switching intentions. Moreover, two pull factors, subjective norms and alternative attractiveness positively influence consumers' switching intentions. Finally, switching costs, emotional commitment and brand community engagement are mooring factors that negatively affect brand-switching intention, whereas consumers' variety seeking has a positive effect.Originality/valueThis study enriches the brand switching literature and offers significant implications for customer retention.

scholarly journals Adaptive marine conservation planning in the face of climate change: What can we learn from physiological, ecological and genetic studies?

2019 ◽  
Vol 17 ◽  
pp. e00566 ◽  
Author(s):  
Gil Rilov ◽  
Antonios D. Mazaris ◽  
Vanessa Stelzenmüller ◽  
Brian Helmuth ◽  
Martin Wahl ◽  
...  
Keyword(s):  
Climate Change ◽  
Conservation Planning ◽  
Marine Conservation ◽  
Genetic Studies ◽  
The Face

scholarly journals Joint Modelling Of Individual Trajectories, Within-Individual Variability And A Later Outcome: Systolic Blood Pressure Through Childhood And Left Ventricular Mass In Early Adulthood

2020 ◽  
Author(s):  
Richard M A Parker ◽  
George Leckie ◽  
Harvey Goldstein ◽  
Laura D Howe ◽  
Jon Heron ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Left Ventricular Mass ◽  
Random Effect ◽  
Early Adulthood ◽  
Credible Interval ◽  
Left Ventricular ◽  
Individual Variability ◽  
Joint Modelling ◽  
Ventricular Mass ◽  
Modelling Approach

Abstract Within-individual variability of repeatedly-measured exposures may predict later outcomes: e.g. blood pressure (BP) variability (BPV) is an independent cardiovascular risk factor above and beyond mean BP. Since two-stage methods, known to introduce bias, are typically used to investigate such associations, we introduce a joint modelling approach, examining associations of mean BP and BPV across childhood to left ventricular mass (indexed to height; LVMI) in early adulthood with data (collected 1990-2011) from the UK’s Avon Longitudinal Study of Parents and Children cohort. Using multilevel models, we allow BPV to vary between individuals (a “random effect”) as well as to depend on covariates (allowing for heteroscedasticity). We further distinguish within-clinic variability (“measurement error”) from visit-to-visit BPV. BPV was predicted to be greater at older ages, at higher bodyweights, and in females, and was positively correlated with mean BP. BPV had a weak positive association with LVMI (10% increase in within-individual BP variance was predicted to increase LVMI by 0.21% (95% credible interval: -0.23%, 0.69%)), but this association became negative (-0.78%, 95% credible interval: -2.54%, 0.22%)) once the effect of mean BP on LVMI was adjusted for. This joint modelling approach offers a flexible method of relating repeatedly-measured exposures to later outcomes.

Who Takes the Floor and Why

2011 ◽  
Vol 56 (4) ◽  
pp. 622-641 ◽  
Author(s):  
Victoria L. Brescoll
Keyword(s):  
Positive Relationship ◽  
Past Research ◽  
Data Sets ◽  
Negative Consequences ◽  
Experimental Setting ◽  
Mediation Analyses ◽  
Strong Positive Relationship ◽  
And Gender ◽  
The Relationship ◽  
Positive Effect

Although past research has noted the importance of both power and gender for understanding volubility—the total amount of time spent talking—in organizations, to date, identifying the unique contributions of power and gender to volubility has been somewhat elusive. Using both naturalistic data sets and experiments, the present studies indicate that while power has a strong, positive effect on volubility for men, no such effect exists for women. Study 1 uses archival data to examine the relationship between the relative power of United States senators and their talking behavior on the Senate floor. Results indicate a strong positive relationship between power and volubility for male senators, but a non-significant relationship for female senators. Study 2 replicates this effect in an experimental setting by priming the concept of power and shows that though men primed with power talk more, women show no effect of power on volubility. Mediation analyses indicate that this difference is explained by women’s concern that being highly voluble will result in negative consequences (i.e., backlash). Study 3 shows that powerful women are in fact correct in assuming that they will incur backlash as a result of talking more than others—an effect that is observed among both male and female perceivers. Implications for the literatures on volubility, power, and previous studies of backlash are discussed.

Sign in / Sign up

Export Citation Format

Share Document