scholarly journals An investigation of the calcification response of the scleractinian coral <i>Astrangia</i> <i>poculata</i> to elevated <i>p</i>CO<sub>2</sub> and the effects of nutrients, zooxanthellae and gender

2012 ◽  
Vol 9 (1) ◽  
pp. 29-39 ◽  
Author(s):  
M. Holcomb ◽  
A. L. Cohen ◽  
D. C. McCorkle
Keyword(s):  
Ocean Acidification ◽  
Elevated Co2 ◽  
Scleractinian Coral ◽  
Egg Production ◽  
Elevated Pco2 ◽  
Future Research ◽  
Population Structures ◽  
Different Temperatures ◽  
Increased Sensitivity ◽  
And Gender

Abstract. The effects of nutrients and pCO2 on zooxanthellate and azooxanthellate colonies of the temperate scleractinian coral Astrangia poculata (Ellis and Solander, 1786) were investigated at two different temperatures (16 °C and 24 °C). Corals exposed to elevated pCO2 tended to have lower relative calcification rates, as estimated from changes in buoyant weights. Experimental nutrient enrichments had no significant effect nor did there appear to be any interaction between pCO2 and nutrients. Elevated pCO2 appeared to have a similar effect on coral calcification whether zooxanthellae were present or absent at 16 °C. However, at 24 °C, the interpretation of the results is complicated by a significant interaction between gender and pCO2 for spawning corals. At 16 °C, gamete release was not observed, and no gender differences in calcification rates were observed – female and male corals showed similar reductions in calcification rates in response to elevated CO2 (15% and 19% respectively). Corals grown at 24 °C spawned repeatedly and male and female corals exhibited two different growth rate patterns – female corals grown at 24 °C and exposed to CO2 had calcification rates 39% lower than females grown at ambient CO2, while males showed a non-significant decline of 5% under elevated CO2. The increased sensitivity of females to elevated pCO2 may reflect a greater investment of energy in reproduction (egg production) relative to males (sperm production). These results suggest that both gender and spawning are important factors in determining the sensitivity of corals to ocean acidification, and considering these factors in future research may be critical to predicting how the population structures of marine calcifiers will change in response to ocean acidification.

scholarly journals A gender bias in the calcification response to ocean acidification

2011 ◽  
Vol 8 (4) ◽  
pp. 8485-8513 ◽  
Author(s):  
M. Holcomb ◽  
A. L. Cohen ◽  
D. C. McCorkle
Keyword(s):  
Ocean Acidification ◽  
Elevated Co2 ◽  
Egg Production ◽  
Elevated Pco2 ◽  
Future Research ◽  
Astrangia Poculata ◽  
Population Structures ◽  
Different Temperatures ◽  
Increased Sensitivity ◽  
Ambient Co2

Abstract. The effects of nutrients and pCO2 on zooxanthellate and azooxanthellate colonies of the temperate scleractinian coral Astrangia poculata (Ellis and Solander, 1786) were investigated at two different temperatures (16 °C and 24 °C). Corals exposed to elevated pCO2 tended to have lower relative calcification rates, as estimated from changes in buoyant weights. No nutrient effect was observed. At 16 °C, gamete release was not observed, and no gender differences in calcification rate were observed. However, corals grown at 24 °C spawned repeatedly and male and female corals exhibited two different growth rate patterns. Female corals grown at 24 °C and exposed to CO2 had calcification rates 39 % lower than females grown at ambient CO2, while males showed only a 5 % decline in calcification under elevated CO2. At 16 °C, female and male corals showed similar reductions in calcification rates in response to elevated CO2 (15 % and 19 % respectively). At 24 °C, corals spawned repeatedly, while no spawning was observed at 16 °C. The increased sensitivity of females to elevated pCO2 may reflect a greater investment of energy in reproduction (egg production) relative to males (sperm production). These results suggest that both gender and spawning are important factors in determining the sensitivity of corals to ocean acidification and their inclusion in future research may be critical to predicting how the population structures of marine calcifiers will change in response to ocean acidification.

scholarly journals Interactive effects of metal pollution and ocean acidification on physiology of marine organisms

2015 ◽  
Vol 61 (4) ◽  
pp. 653-668 ◽  
Author(s):  
Anna V. Ivanina ◽  
Inna M. Sokolova
Keyword(s):  
Trace Metals ◽  
Ocean Acidification ◽  
Elevated Co2 ◽  
Marine Ecosystems ◽  
Marine Organisms ◽  
Interactive Effects ◽  
Future Research ◽  
Acid Base ◽  
Physiological Basis ◽  
Physiological Functions

Abstract Changes in the global environment such as ocean acidification (OA) may interact with anthropogenic pollutants including trace metals threatening the integrity of marine ecosystems. We analyze recent studies on the interactive effects of OA and trace metals on marine organisms with a focus on the physiological basis of these interactions. Our analysis shows that the responses to elevated CO2 and metals are strongly dependent on the species, developmental stage, metal biochemistry and the degree of environmental hypercapnia, and cannot be directly predicted from the CO2-induced changes in metal solubility and speciation. The key physiological functions affected by both the OA and trace metal exposures involve acid-base regulation, protein turnover and mitochondrial bioenergetics, reflecting the sensitivity of the underlying molecular and cellular pathways to CO2and metals. Physiological interactions between elevated CO2 and metals may impact the organisms’ capacity to maintain acid-base homeostasis and reduce the amount of energy available for fitness-related functions such as growth, development and reproduction thereby affecting survival and performance of estuarine populations. Environmental hypercapnia may also affect the marine food webs by altering predator-prey interactions and the trophic transfer of metals in the food chain. However, our understanding of the degree to which these effects can impact the function and integrity of marine ecosystems is limited due the scarcity of the published research and its bias towards certain taxonomic groups. Future research priorities should include studies of metal x PCO2 interactions focusing on critical physiological functions (including acid-base, protein and energy homeostasis) in a greater range of ecologically and economically important marine species, as well as including the field populations naturally exposed (and potentially adapted) to different levels of metals and CO2 in their environments.

Ocean Acidification: Knowns, Unknowns, and Perspectives

2011 ◽  
Author(s):  
Jean-Pierre Gattuso ◽  
Jelle Bijma
Keyword(s):  
Ocean Acidification ◽  
Elevated Co2 ◽  
Acoustic Noise ◽  
Current Knowledge ◽  
Co2 Enrichment ◽  
Marine Organisms ◽  
Societal Implications ◽  
Future Research ◽  
First Results ◽  
Enrichment Experiments

Although the changes in the chemistry of seawater driven by the uptake of CO2 by the oceans have been known for decades, research addressing the effects of elevated CO2 on marine organisms and ecosystems has only started recently (see Chapter 1). The first results of deliberate experiments on organisms were published in the mid 1980s (Agegian 1985) and those on communities in 2000 (Langdon et al. 2000; Leclercq et al. 2000 ). In contrast, studies focusing on the response of terrestrial plant communities began much earlier, with the first results of free-air CO2 enrichment experiments (FACE) being published in the late 1960s (see Allen 1992 ). Not surprisingly, knowledge about the effects of elevated CO2 on the marine realm lags behind that concerning the terrestrial realm. Yet ocean acidification might have significant biological, ecological, biogeochemical, and societal implications and decision-makers need to know the extent and severity of these implications in order to decide whether they should be considered, or not, when designing future policies. The goals of this chapter are to summarize key information provided in the preceding chapters by highlighting what is known and what is unknown, identify and discuss the ecosystems that are most at risk, as well as discuss prospects and recommendation for future research. The chemical, biological, ecological, biogeochemical, and societal implications of ocean acidification have been comprehensively reviewed in the previous chapters with one minor exception. Early work has shown that ocean acidification significantly affects the propagation of sound in seawater and suggested possible consequences for marine organisms sensitive to sound (Hester et al . 2008). However, sub sequent studies have shown that the changes in the upper-ocean sound absorption coefficient at future pH levels will have no or a small impact on ocean acoustic noise (Joseph and Chiu 2010; Udovydchenkov et al . 2010). The goal of this section is to condense the current knowledge about the consequences of ocean acidification in 15 key statements. Each statement is given levels of evidence and, when possible, a level of confidence as recommended by the Intergovernmental Panel on Climate Change (IPCC) for use in its 5th Assessment Report (Mastrandrea et al. 2010).

Self-Compassion and Quality of Life in Adults Who Stutter

2020 ◽  
Vol 29 (4) ◽  
pp. 2097-2108
Author(s):  
Robyn L. Croft ◽  
Courtney T. Byrd
Keyword(s):  
Quality Of Life ◽  
Social Connectedness ◽  
The Self ◽  
Future Research ◽  
Self Compassion ◽  
Adults Who Stutter ◽  
And Gender ◽  
Relationship Of ◽  
The Impact

Purpose The purpose of this study was to identify levels of self-compassion in adults who do and do not stutter and to determine whether self-compassion predicts the impact of stuttering on quality of life in adults who stutter. Method Participants included 140 adults who do and do not stutter matched for age and gender. All participants completed the Self-Compassion Scale. Adults who stutter also completed the Overall Assessment of the Speaker's Experience of Stuttering. Data were analyzed for self-compassion differences between and within adults who do and do not stutter and to predict self-compassion on quality of life in adults who stutter. Results Adults who do and do not stutter exhibited no significant differences in total self-compassion, regardless of participant gender. A simple linear regression of the total self-compassion score and total Overall Assessment of the Speaker's Experience of Stuttering score showed a significant, negative linear relationship of self-compassion predicting the impact of stuttering on quality of life. Conclusions Data suggest that higher levels of self-kindness, mindfulness, and social connectedness (i.e., self-compassion) are related to reduced negative reactions to stuttering, an increased participation in daily communication situations, and an improved overall quality of life. Future research should replicate current findings and identify moderators of the self-compassion–quality of life relationship.

The use of ICT by SMMEs in a Digital Economy: A case study in Buffalo City Metropolitan in South Africa [Abstract]

10.28945/4314 ◽  
2019 ◽  
Keyword(s):  
South Africa ◽  
Technology Acceptance ◽  
21St Century ◽  
Common Knowledge ◽  
Digital Economy ◽  
Future Research ◽  
Wealth Creation ◽  
Underdeveloped Areas ◽  
And Gender ◽  
Set Up

Aim/Purpose: The goal of this study is to advance understanding of ICT utilization by SMMEs by checking access, ability (in terms of technological skills) and usage of ICT among some SMMEs entrepreneurs operating their businesses in an underdeveloped areas to enhance their business activities in order to utilizes the digital opportunities 21st century digital economies present. Background: In today’s world no nation or region is untouched by the forces of globalization and digital economy. One of the key pioneering forces of globalization is the advances of ICT like internet, social networks, etc. In the sphere of business, this pioneering force has also altered the way businesses and organizations communicate and interact with customers and society at large. Such alternation presents obvious opportunities for wealth creation and growth for businesses and organizations that are well-equipped to take advantages of them. But for those that are less-equipped, particularly SMMEs, globalization can easily lead to fore-closures and marginalization. It is a common knowledge that SMMEs entrepreneurs mostly rely on ICT gadgets like mobile phone, Laptops, Tablets to conduct their business activities as many of them don’t have enough capital to set up offices with necessary equipment. Therefore, using various ICT functions/programs on these ICT devices to enhance their business activities are critical to their businesses in the 21st century digital economies. Methodology: Purposeful sampling was used to approach fifty-four SMMEs entrepreneurs operating their businesses in underdeveloped areas locally called Townships in Buffalo City Metropolitan. Microsoft excel was used in the descriptive statistics. Contribution: This research will add to the growing knowledge ICT usage in SMMEs in the 21st century digital economies. Findings: The results indicate that the participating SMMEs entrepreneurs need to be educated, trained and supported in the use of the ICT applicable to enhance their business activities in order for them to take advantages of 21st century digital economies present. Recommendations for Practitioners: The agencies tasked with looking after SMMEs in South Africa needs to consider the lacked of utilisation of ICTs by SMMEs entrepreneurs operating their businesses in underdeveloped areas as one of the barrier to growing of their businesses and take necessary steps to address it. Recommendation for Researchers: Since age and gender have been proven to be key-moderating variables in many technology acceptance models. There is a need to explore in depth whether the factors of gender and age also act as barriers. Impact on Society: The research will assist stakeholders, policy makers and agencies tasked with looking after SMMEs to identify the barriers hindering SMMEs to grow and address them accordingly. Future Research: More work needs to be done to check whether gender, age of the SMMEs entrepreneurs have some effects on their attitude towards the integration of ICT into their business activities.

Feeling Threatened by Immigrants: The Role of Ideology and Subjective Societal Status

2020 ◽  
Author(s):  
Michael Bollwerk ◽  
Bernd Schlipphak ◽  
Joscha Stecker ◽  
Jens Hellmann ◽  
Gerald Echterhoff ◽  
...  
Keyword(s):  
Online Survey ◽  
Middle Eastern ◽  
Social Dominance Orientation ◽  
Survey Study ◽  
Future Research ◽  
Right Wing Authoritarianism ◽  
Threat Perceptions ◽  
Contextual Determinants ◽  
Intergroup Conflicts ◽  
And Gender

Threat perceptions towards immigrants continue to gain importance in the context of growing international migration. To reduce associated intergroup conflicts, it is crucial to understand the personal and contextual determinants of perceived threat. In a large online survey study (N = 1,184), we investigated the effects of ideology (i.e., Right-Wing Authoritarianism and Social Dominance Orientation), subjective societal status (SSS) and their interaction effects in predicting symbolic and realistic threat perceptions towards Middle Eastern immigrants. Results showed that ideology (higher RWA and SDO) and lower SSS significantly predicted both symbolic and realistic threat, even after controlling for income, education, age, and gender. Furthermore, ideology and SSS interacted significantly in predicting realistic threat, with higher levels of SDO and RWA enhancing the effect of SSS. In the discussion, we focus on the implications of our findings with respect to understanding societal conflicts, discuss methodological limitations, and provide directions for future research.

The Role of Resilience in Sexual and Gender Minority Mental Health

2020 ◽  
pp. 428-442
Author(s):  
Dawn M. Szymanski ◽  
Kirsten A. Gonzalez
Keyword(s):  
Mental Health ◽  
Minority Stress ◽  
Quantitative Research ◽  
Social Stigma ◽  
Therapeutic Interventions ◽  
Future Research ◽  
Minority Mental Health ◽  
And Gender ◽  
Structural Levels

Many lesbian, gay, bisexual, transgender, and queer (LGBTQ) persons are able to persevere and flourish despite pervasive social stigma and minority stress based on their sexual orientation and gender identity. This chapter reviews the research on LGBTQ resilience that can occur at individual, interpersonal/family, community, and contextual/structural levels. The authors describe qualitative research that has examined pathways to resilience and positive LGBTQ identity. The authors also review quantitative research on LGBTQ resilience via mediator, moderator, and moderated mediation models. Variables are described that have been found to explain or buffer the links between external and internalized minority stressors and mental health outcomes. The authors review the small but growing body of research that has begun to examine the efficacy of therapeutic interventions aimed at promoting LGBTQ resilience. Limitations are discussed and directions for future research are suggested.

The Interplay of Developing Morality and Gender Attitudes

2020 ◽  
pp. 724-745
Author(s):  
Rebecca S. Bigler ◽  
Lynn S. Liben
Keyword(s):  
Psychological Theory ◽  
The United States ◽  
Gender Nonconformity ◽  
Gender Attitudes ◽  
Future Research ◽  
Policy And Practice ◽  
Ethical Policy ◽  
History Of ◽  
And Gender ◽  
And Behavior

Morality and gender are intersecting realms of human thought and behavior. Reasoning and action at their intersection (e.g., views of women’s rights legislation) carry important consequences for societies, communities, and individual lives. In this chapter, the authors argue that children’s developing views of morality and gender reciprocally shape one another in important and underexplored ways. The chapter begins with a brief history of psychological theory and research at the intersection of morality and gender and suggests reasons for the historical failure to view gender attitudes through moral lenses. The authors then describe reasons for expecting morality to play an important role in shaping children’s developing gender attitudes and, reciprocally, for gender attitudes to play an important role in shaping children’s developing moral values. The authors next illustrate the importance and relevance of these ideas by discussing two topics at the center of contentious debate in the United States concerning ethical policy and practice: treatment of gender nonconformity and gender-segregated schooling. The chapter concludes with suggestions for future research.

Military Background and Gender Identity in Psychological Assessment Among College Students: Factorial Invariance of the Counseling Center Assessment of Psychological Symptoms–62 (CCAPS-62)

Assessment ◽  
2021 ◽  
pp. 107319112199876
Author(s):  
Arpita Ghosh ◽  
Christopher R. Niileksela ◽  
Rebecca Janis
Keyword(s):  
Gender Identity ◽  
Structural Equation ◽  
Psychological Symptoms ◽  
College Counseling ◽  
Counseling Center ◽  
Factorial Invariance ◽  
Equation Modeling ◽  
Future Research ◽  
Military Background ◽  
And Gender

The purpose of this study was to examine the factorial invariance of the Counseling Center Assessment of Psychological Symptoms–62 (CCAPS-62) across military background and gender identity. A sample of 2,208 military students and 2,208 nonmilitary students were chosen from a large database of university and college counseling centers. Using exploratory structural equation modeling, findings suggested the CCAPS-62 is mostly invariant across military background and gender identity. Only three item thresholds appeared to be noninvariant across groups. These results suggest comparisons of scores across military background and gender can be made. Latent mean differences across groups were also examined. After controlling for several background variables, there were some differences between males and females on subscales measuring depression, eating concerns, and generalized anxiety, but no differences between military and nonmilitary students. Implications for practice and future research are discussed.

scholarly journals An Experimental Study of the Decomposition and Carbonation of Magnesium Carbonate for Medium Temperature Thermochemical Energy Storage

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1316
Author(s):  
Daniel Mahon ◽  
Gianfranco Claudio ◽  
Philip Eames
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Energy Storage ◽  
Magnesium Carbonate ◽  
Experimental Results ◽  
Future Research ◽  
Medium Temperature ◽  
Different Temperatures ◽  
Decomposition Enthalpy ◽  
Co2 Atmosphere

To improve the energy efficiency of an industrial process thermochemical energy storage (TCES) can be used to store excess or typically wasted thermal energy for utilisation later. Magnesium carbonate (MgCO3) has a turning temperature of 396 °C, a theoretical potential to store 1387 J/g and is low cost (~GBP 400/1000 kg). Research studies that assess MgCO3 for use as a medium temperature TCES material are lacking, and, given its theoretical potential, research to address this is required. Decomposition (charging) tests and carbonation (discharging) tests at a range of different temperatures and pressures, with selected different gases used during the decomposition tests, were conducted to gain a better understanding of the real potential of MgCO3 for medium temperature TCES. The thermal decomposition (charging) of MgCO3 has been investigated using thermal analysis techniques including simultaneous thermogravimetric analysis and differential scanning calorimetry (TGA/DSC), TGA with attached residual gas analyser (RGA) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) (up to 650 °C). TGA, DSC and RGA data have been used to quantify the thermal decomposition enthalpy from each MgCO3.xH2O thermal decomposition step and separate the enthalpy from CO2 decomposition and H2O decomposition. Thermal analysis experiments were conducted at different temperatures and pressures (up to 40 bar) in a CO2 atmosphere to investigate the carbonation (discharging) and reversibility of the decarbonation–carbonation reactions for MgCO3. Experimental results have shown that MgCO3.xH2O has a three-step thermal decomposition, with a total decomposition enthalpy of ~1050 J/g under a nitrogen atmosphere. After normalisation the decomposition enthalpy due to CO2 loss equates to 1030–1054 J/g. A CO2 atmosphere is shown to change the thermal decomposition (charging) of MgCO3.xH2O, requiring a higher final temperature of ~630 °C to complete the decarbonation. The charging input power of MgCO3.xH2O was shown to vary from 4 to 8136 W/kg with different isothermal temperatures. The carbonation (discharging) of MgO was found to be problematic at pressures up to 40 bar in a pure CO2 atmosphere. The experimental results presented show MgCO3 has some characteristics that make it a candidate for thermochemical energy storage (high energy storage potential) and other characteristics that are problematic for its use (slow discharge) under the experimental test conditions. This study provides a comprehensive foundation for future research assessing the feasibility of using MgCO3 as a medium temperature TCES material. Future research to determine conditions that improve the carbonation (discharging) process of MgO is required.

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