scholarly journals Meiofauna winners and losers of coastal hypoxia: case study harpacticoid copepods

2014 ◽  
Vol 11 (2) ◽  
pp. 281-292 ◽  
Author(s):  
M. Grego ◽  
B. Riedel ◽  
M. Stachowitsch ◽  
M. De Troch
Keyword(s):  
Harpacticoid Copepod ◽  
Recovery Phase ◽  
Harpacticoid Copepods ◽  
The Family ◽  
Juvenile Stages ◽  
Males And Females ◽  
Gravid Females ◽  
The Impact

Abstract. The impact of anoxia on meiobenthic copepod species was assessed by means of a field experiment. Four plexiglass chambers were deployed in situ in 24 m depth to simulate an anoxic event of 9 days, 1 month, 2 months and 10 months. From normoxic to anoxic conditions, we recorded a drop in copepod density and species richness. With increasing duration of anoxia the relative abundance of the individuals of the family Cletodidae increased, and they survived the 1 month and 2 month anoxia, the latter with few specimens. They were the true "winners" of the experimentally induced anoxia. Dominance did not increase in the deployments because not one, but several species from this family were tolerant to anoxia. The overall rate of survival was the same for males and females, but no juvenile stages of copepods survived in anoxia. During a recovery phase of 7 days after a short-term anoxia of 9 days, harpacticoid copepod density did not increase significantly, and there was only a slight increase in species diversity. We concluded that no substantial colonisation from the surrounding sediment took place. The survivors, however, showed a high potential for recovery according to the number of gravid females, whose number increased significantly once the oxygen was available again. These findings imply that substantial energy is allocated to reproduction in the recovery phase.

scholarly journals Meiofauna winners and losers of coastal hypoxia: case study harpacticoid copepods

2013 ◽  
Vol 10 (7) ◽  
pp. 12385-12416 ◽  
Author(s):  
M. Grego ◽  
B. Riedel ◽  
M. Stachowitsch ◽  
M. De Troch
Keyword(s):  
Harpacticoid Copepod ◽  
Recovery Phase ◽  
Harpacticoid Copepods ◽  
The Family ◽  
Juvenile Stages ◽  
Males And Females ◽  
Gravid Females ◽  
The Impact

Abstract. The impact of anoxia on meiobenthic copepod species was assessed by means of a field experiment. Four plexiglass chambers were deployed in situ in 24 m depth to simulate an anoxic event of 9 days, 1 month, 2 months and 10 months. From normoxic to anoxic conditions, we recorded a drop in copepod density and species richness. With increasing duration of anoxia the relative abundance of the individuals of the family Cletodidae increased, and they survived the 1 month and 2 month anoxia, the latter with few specimens. They were the true "winners" of the experimentally induced anoxia. Dominance did not increase throughout all deployments because; not one, but several species from this family were tolerant to anoxia. The overall rate of survival was the same for males and females, but no juvenile stages of copepods survived in anoxia. During a recovery phase of 7 days after a short-term anoxia of 9 days, harpacticoid copepod density did not increase significantly, and there was only a slight increase in species diversity. We concluded that there was no substantial colonisation from the surrounding sediment. The survivors, however, showed a high potential for recovery according to the number of gravid females, whose number increased significantly once the oxygen was available again. These finding imply that a substantial amount of energy is allocated to reproduction in the recovery phase.

scholarly journals Fuel economy assessment tool for auxiliary kite propulsion of merchant ship

2018 ◽  
pp. 5-7 ◽  
Author(s):  
Vincent Podeur ◽  
Damien Merdrignac ◽  
Morgan Behrel ◽  
Kostia Roncin ◽  
Caroline Fonti ◽  
...  
Keyword(s):  
Fuel Economy ◽  
Assessment Tool ◽  
Round Trip ◽  
Merchant Ship ◽  
Added Resistance In Waves ◽  
The Mean ◽  
The Impact ◽  
Engine Power

A tool dedicated to assess fuel economy induced by kite propulsion has been developed. To produce reliable results, computations must be performed on a period over several years, for several routes and for several ships. In order to accurately represent the impact of meteorological trends variations on the exploitability of the kite towing concept, a time domain approach of the problem has been used. This tool is based on the weather database provided by the ECMWF. Two sailing strategies can be selected for assessing the performance of the kite system. For a given kite area, the simulation can be run either at constant speed or at constant engine power. A validation has been made, showing that predicted consumption is close from in-situ measurement. It shows an underestimation of 11.9% of the mean fuel consumption mainly due to auxiliary consumption and added resistance in waves that were not taken into account. To conclude, a case study is performed on a 2200 TEU container ship equipped with an 800m² kite on a transatlantic route between Halifax and Le Havre. Round trip simulations, performed over 5 years of navigation, show that the total economy predicted is of around 12% at a speed of 16 knots and around 6.5% at a speed of 19 knots.

Economic Security and Empowerment of Rural Women

2020 ◽  
pp. 171-186
Author(s):  
Suganda Ramamoorthi
Keyword(s):  
Rural Women ◽  
Tamil Nadu ◽  
Economic Security ◽  
Economic Resources ◽  
Patriarchal Family ◽  
The Family ◽  
Private And Public ◽  
Gender Asymmetry ◽  
The Impact

Economic security is a fundamental cord that would enhance the empowerment levels of women. In the patriarchal family structure, women have little or no access to economic resources, making them vulnerable. Social sanction for femicide, social and cultural discriminatory practices, and violence against women have curtailed women's choices and freedom. The impact of the elimination of girl children and strong son preference has deprived women of their economic entitlements. The case study is of particular interest as it is undertaken in Usilampatti taluk in Tamil Nadu, India, which is notorious for the practice of female foeticide and infanticide leading to low sex ratio. This chapter is an attempt to identify how rural women who have escaped femicide negotiate with gender asymmetry, reorganize the power relations within the family and market structure, manage economic resources, and emerge as independent leaders both in the private and public domains.

The Impact of Disability: A Family Crisis

1982 ◽  
Vol 13 (3) ◽  
pp. 25-29 ◽  
Author(s):  
Susan Reagles
Keyword(s):  
Social Adjustment ◽  
Typical Pattern ◽  
Family Crisis ◽  
The Family ◽  
Individual Family ◽  
Adjustment To Disability ◽  
The Individual ◽  
Adjustment Issues ◽  
The Impact

A disability experienced by one family member impacts on all individuals in the family unit and influences their typical pattern of interaction. The process of individual and family adjustment to disability, a family crisis, is seen in a case study of Sam and his diagnosis of multiple sclerosis. The individual, family and social adjustment issues, including redefinition of family, social, sexual and work roles, are examined in a real live context. Tentative recommendations for professionals working with families in which an individual becomes disabled are developed from personal interviews with Sam and his family.

Partnership working between young carers project and social services

2013 ◽  
Vol 16 (3) ◽  
pp. 50-64
Author(s):  
Anna Heyman
Keyword(s):  
Social Work ◽  
Social Services ◽  
Family Relationships ◽  
Qualitative Interviews ◽  
Theory And Practice ◽  
Young Carers ◽  
Social Work Theory ◽  
The Family ◽  
The Impact

This article draws on in-depth qualitative interviews with ten practitioners who specialise in working with young carers, to examine how members of the emerging profession of ‘young carers’ worker’ view their partnerships with social services. It focuses particularly on one case study area (Town Z), where partnerships between social services and the voluntary sector around young carers were relatively highly developed. It explores the practitioners’ comments about the impact of their organisations’ partnerships with social services on their work. This is done in the context of their conceptualisations of care and family relationships. In particular, the themes of identifying young carers and working with the family as a whole are discussed, and young carers’ workers views are compared to the conceptualisations that come across in literature from both disability studies and social work perspectives. It is concluded that young carers’ workers conceptualisations of care and disability do differ markedly from the perspectives that appear to dominate both social work theory and practice, and that this impacting on how the former view their partnerships with the latter.

scholarly journals Functioning of a family with a child suffering from cystic fibrosis and short bowel syndrome - case study

2018 ◽  
Vol 19 (2) ◽  
pp. 100-111
Author(s):  
Justyna Świerczyńska ◽  
Agnieszka Mazur ◽  
Izabela Chojnowska-Ćwiąkała ◽  
Agnieszka Podosek
Keyword(s):  
Cystic Fibrosis ◽  
Mental Disorders ◽  
Short Bowel Syndrome ◽  
Family System ◽  
Short Bowel ◽  
The Family ◽  
Child Patient ◽  
The Impact

Abstract This article presents the problem of the functioning of a family with a child suffering from two painful, chronic and incurable diseases - cystic fibrosis and short bowel syndrome. Its aim is to learn about the impact of these diseases on the occurrence and course of mental disorders in a child and on the functioning of the whole family in which such a child is brought up. Like any long-term illness of a child, it has influenced changes in the functioning of the family system. The parents’ functioning and the flexibility of the family system conditioned the acceptance of the diagnosis and determined further participation of the family in the treatment process. This article also discusses the risk of unfavorable attitudes of parents towards the child’s illnesses, which may contribute to the development of mental disorders in the child patient, as well as in his/her parents or siblings. In the process of treatment and rehabilitation, the necessity for cooperation of medical staff, the patient and his/her parents has been emphasised.

scholarly journals Influence of Krishi Vigyan Kendras and Socio-Economic Characteristics towards Adoption of Climate-Resilient Technologies

2021 ◽  
pp. 38-43
Author(s):  
Peddi Naga Harsha Vardhan ◽  
Prabhat Kumar Pal ◽  
Deepa Roy
Keyword(s):  
Climate Change ◽  
Agricultural Research ◽  
Research Work ◽  
Household Head ◽  
Control Area ◽  
The Family ◽  
Conservation Technology ◽  
Socio Economic Variables ◽  
The Impact

Indian economy is mostly dependent on agriculture but climate change is the most threatening phenomena and addressing it as the biggest challenge now a days. ‘In order to reduce the climate change adversities, Indian Council of Agricultural Research (ICAR) with the help of different Krishi vigyan Kendra (KVKs) operated a project called “National Innovations on Climate Resilient Agriculture”. To know the impact of the project a study was conducted in KVKs (i.e., NICRA, KVKs) of two districts of North Bengal i.e., Cooch Behar and Malda. One adopted village and one non adopted village adjacent to adopted village (as control area) were selected for study from each KVK-area.  From each village 30 respondents were selected randomly i.e., 60 respondents from adopted village and 60 respondents from non-adopted village. A total of 120 respondents were taken for the research work. The result from this study shows that in the level of awareness, adoption of water-saving technology, in-situ moisture conservation technology, water harvesting, recycling technology and other climate-resilient technologies the mean awareness and adoption score is more in the adopted village than in the non adopted village. The education of household head, total land holding, outside contact score, total yearly income of the family, extent of participation, exposure to interpersonal media, household power access status, level of awareness on climate resilient technology and extent of association with KVK are positively and significantly associated with adoption score. It is also found that in non-adopted villages the socio-economic variables are influencing more towards adoption of climate-resilient technology, whereas, in adopted villages it is due to the association with KVK.

scholarly journals Assessing the efficiency of a “buried wall” barrier in the establishment of near-surface long-term storage and disposal facilities for RW

2021 ◽  
Vol 14 (1) ◽  
pp. 96-105
Author(s):  
V. V. Suskin ◽  
◽  
I. V. Kapyrin ◽  
F. V. Grigorev ◽  
◽  
...  
Keyword(s):  
Near Surface ◽  
Transfer Processes ◽  
Long Term Storage ◽  
Mass Transfer Processes ◽  
High Degree ◽  
The Impact ◽  
Term Storage

The article evaluates the impact of a “buried wall” barrier on the long-term safety during the long-term storage1 or in-situ disposal of nuclear legacy facilities, in particular, industrial reservoirs, as well as during the development of near-surface disposal facilities for radioactive waste (RWDF). For assessment purposes, filtration and mass transfer processes have been numerically modelled in the GeRa code based on a case study of a reference near-surface facility. The study explores in which way the available covering screen affects the dynamics of contaminant spread. It evaluates the sensitivity of the results to the dispersion parameter commonly characterized by a high degree of uncertainty.

scholarly journals Mind the Outgroup and Bare Branches in Total-Evidence Dating: a Case Study of Pimpliform Darwin Wasps (Hymenoptera, Ichneumonidae)

2020 ◽  
Author(s):  
Tamara Spasojevic ◽  
Gavin R Broad ◽  
Ilari E Sääksjärvi ◽  
Martin Schwarz ◽  
Masato Ito ◽  
...  
Keyword(s):  
Evolutionary Rate ◽  
Total Evidence ◽  
Morphological Data ◽  
Phylogenetic Study ◽  
Phylogenetic Distance ◽  
Rate Heterogeneity ◽  
The Family ◽  
The Impact ◽  
Age Estimates

Abstract Taxon sampling is a central aspect of phylogenetic study design, but it has received limited attention in the context of total-evidence dating, a widely used dating approach that directly integrates molecular and morphological information from extant and fossil taxa. We here assess the impact of commonly employed outgroup sampling schemes and missing morphological data in extant taxa on age estimates in a total-evidence dating analysis under the uniform tree prior. Our study group is Pimpliformes, a highly diverse, rapidly radiating group of parasitoid wasps of the family Ichneumonidae. We analyze a data set comprising 201 extant and 79 fossil taxa, including the oldest fossils of the family from the Early Cretaceous and the first unequivocal representatives of extant subfamilies from the mid Paleogene. Based on newly compiled molecular data from ten nuclear genes and a morphological matrix that includes 222 characters, we show that age estimates become both older and less precise with the inclusion of more distant and more poorly sampled outgroups. These outgroups not only lack morphological and temporal information, but also sit on long terminal branches and considerably increase the evolutionary rate heterogeneity. In addition, we discover an artefact that might be detrimental for total-evidence dating: “bare-branch attraction”, namely high attachment probabilities of certain fossils to terminal branches for which morphological data are missing. Using computer simulations, we confirm the generality of this phenomenon and show that a large phylogenetic distance to any of the extant taxa, rather than just older age, increases the risk of a fossil being misplaced due to bare-branch attraction. After restricting outgroup sampling and adding morphological data for the previously attracting, bare branches, we recover a Jurassic origin for Pimpliformes and Ichneumonidae. This first age estimate for the group not only suggests an older origin than previously thought, but also that diversification of the crown group happened well before the Cretaceous-Paleogene boundary. Our case study demonstrates that in order to obtain robust age estimates, total-evidence dating studies need to be based on a thorough and balanced sampling of both extant and fossil taxa, with the aim of minimizing evolutionary rate heterogeneity and missing morphological information.

Sign in / Sign up

Export Citation Format

Share Document