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PubMed Journals Articles About "Decline Diversity Swedish Seas Environmental Narratives Marine History" - Page: 3 RSS

17:26 EST 21st January 2020 | BioPortfolio

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Showing "Decline diversity Swedish seas Environmental narratives marine history" PubMed Articles 51–75 of 16,000+

Spatial genetic structure and diversity of natural populations of Aesculus hippocastanum L. in Greece.

Horse-chestnut (Aesculus hippocastanum L.) is an endemic and relict species from the Mediterranean biodiversity hotspot and a popular ornamental tree. Knowledge about the evolutionary history of this species remains scarce. Here, we ask what historical and ecological factors shaped the pattern of genetic diversity and differentiation of this species. We genotyped 717 individuals from nine natural populations using microsatellite markers. The influence of distance, topography and habitat variables on spatial...


Time-course relationship between environmental factors and microbial diversity in tobacco soil.

Soil physicochemical properties and microbial diversity both play equally important roles in tobacco cultivation. However, the relationship between these factors remains unclear. In this study, we investigated their correlations through the whole tobacco growth period, including the pretransplanting (YX-p), root extending (R), flourishing (F), and mature (M) stages in the Yuxi region of the Yunnan-Guizhou Plateau by measuring physicochemical properties and conducting 16S/18S rRNA analysis. The analysis demo...

The impact of mental health recovery narratives on recipients experiencing mental health problems: Qualitative analysis and change model.

Mental health recovery narratives are stories of recovery from mental health problems. Narratives may impact in helpful and harmful ways on those who receive them. The objective of this paper is to develop a change model identifying the range of possible impacts and how they occur.


Narratives of older persons' frailty and physical activity in relation to environmental landscapes and time.

The objective of this study was to explore the influence of the environmental landscape on the physical activity of older persons experiencing frailty.

The diversity and biogeography of microeukaryotes in the euphotic zone of the northwestern Pacific Ocean.

Microeukaryotes are the key ecosystem drivers mediating marine productivity, the food web and biogeochemical cycles. The northwestern Pacific Ocean (NWPO), as one of the world's largest oligotrophic regions, remains largely unexplored regarding diversity and biogeography of microeukaryotes. Here, we investigated the community composition and geographical distribution of microeukaryotes collected from the euphotic zone of three different regions in the NWPO using high-throughput sequencing of the 18S rRNA ge...

A method for the determination of organically bound tritium in marine biota based on an improved tubular-combustion system.

A method for the measurement of organically bound tritium (OBT) in marine biota has been developed using a combustion device designed with three independent temperature control zones and a two-stage intake mode to ensure full combustion of samples. The versatility of the combustion device and combustion water recoveries were tested on nine different types of marine biota, with recoveries varying from 85.15% to 92.67%, with an average of 89.4 ± 11.34%. This indicates that our developed combustion method...

Global vulnerability of marine mammals to global warming.

Although extinctions due to climate change are still uncommon, they might surpass those caused by habitat loss or overexploitation over the next few decades. Among marine megafauna, mammals fulfill key and irreplaceable ecological roles in the ocean, and the collapse of their populations may therefore have irreversible consequences for ecosystem functioning and services. Using a trait-based approach, we assessed the vulnerability of all marine mammals to global warming under high and low greenhouse gas emis...

The psychologist's biographer: Writing lives in the history of psychology.

How should historians employ psychological insight when seeking to understand and analyze their historical subjects? That is the essential question explored in this methodological reflection on the relationship between psychology and biography. To answer it, this paper offers a historical, historiographical, and theoretical analysis of life writing in the history of psychology. It touches down in the genres of autobiography, psychobiography, and cultural history to assess how other historians and psychologi...

Female sex and western-style diet protect mouse resistance arteries during acute oxidative stress.

Western-style diet (WD; high in fat and carbohydrates) increases vascular oxidative stress. We hypothesized that vascular cells adapt to WD by developing resilience to oxidative stress. Male and female C57BL/6J mice (age, 4 wk) were fed control diet (CD) or WD for 16-20 wk. Small resistance (superior epigastric) arteries (SEAs; diameter, ~125 μm) were isolated and pressurized for study. Basal reactive oxygen speciesproduction was greatest in SEAs of males fed WD. During exposure to HO (200 μM, 50 min), pr...

Good birth narratives: Diverse South African women's perspectives.

There is currently a substantial international research focus on issues relating to childbirth distress, traumatic birth and negative birth experiences. Less research attention has been paid to women's narratives or accounts of positive or affirming birth experiences, particularly in the South African context. The aim of this article is to explore the ingredients of a 'good birth' experience from the perspectives of South African women's birth narratives.

How corals made rocks through the ages.

Hard, or stony, corals make rocks that can, on geological time scales, lead to the formation of massive reefs in shallow tropical and subtropical seas. In both historical and contemporary oceans, reef building corals retain information about the marine environment in their skeletons, which is an organic-inorganic composite material. The elemental and isotopic composition of their skeletons is frequently used to reconstruct the environmental history of Earth's oceans over time, including temperature, pH and ...

Visual opsin diversity in sharks and rays.

The diversity of colour vision systems found in extant vertebrates suggests that different evolutionary selection pressures have driven specialisations in photoreceptor complement and visual pigment spectral tuning appropriate for an animal's behaviour, habitat and life history. Aquatic vertebrates in particular show high variability in chromatic vision and have become important models for understanding the role of colour vision in prey detection, predator avoidance and social interactions. In this study, w...

The Limits of Power: Wind Energy, Orkney, and the Post-war British State.

This article identifies the environmental components of the limits of industrial nationalization between 1945 and 1956, and with it the spatial dimensions of state power, through a case study of wind power experiments on the Orkney islands. Technocratic and socialist principles drove efforts to supply electricity to all corners of the nation, but material and environmental factors limited success, especially in remote regions. The article considers the materiality of islandness and its effects on the applic...

Genetic background modifies CNS-mediated sensorimotor decline in the AD-BXD mouse model of genetic diversity in Alzheimer's disease.

Many patients with Alzheimer's dementia also exhibit non-cognitive symptoms such as sensorimotor deficits, which can precede the hallmark cognitive deficits and significantly impact daily activities and an individual's ability to live independently. However, the mechanisms underlying sensorimotor dysfunction in AD and their relationship with cognitive decline remains poorly understood, due in part to a lack of translationally relevant animal models. To address this, we recently developed a novel model of ge...

Study partner-reported decline identifies cognitive decline and dementia risk.

Identifying individuals at risk for cognitive decline, Mild Cognitive Impairment (MCI), and dementia due to Alzheimer's disease (AD) is a critical need. Functional decline is associated with risk and can be efficiently assessed by participants and study partners (SPs). We tested the hypothesis that SP-reported functional decline is an independent predictor of dementia risk and cognitive decline.

Influences of Salinity and Organic Compounds on Embryo Development in Three Medaka Oryzias Congeners with Habitats Ranging from Freshwater to Marine.

To clarify whether Oryzias congeners, including freshwater, brackish water, and marine medaka, would be useful models for evaluating environmental chemical effects in various aquatic ecosystems, we examined the influence of salinity on their embryo development. We also compared the toxicity values of the organotin compounds triphenyltin and tributyltin, which remain pollutants of marine and freshwater ecosystems, between Oryzias latipes (freshwater), Oryzias melastigma (brackish water), and Oryzias javanicu...

Agricultural intensification was associated with crop diversification in India (1947-2014).

Declines in agricultural biodiversity associated with modern farming practices may negatively affect the sustainability of agro-ecosystems, but formal knowledge of historical variation in spatio-temporal variation of agro-biodiversity is limited. We used time series of national (1947-2014) and district-level (1956-2008) crop distribution data for India to show that despite strong agricultural intensification after 1960, the average crop species diversity at the district level was stable, but increased at th...

Sirtuins as regulators of the cellular stress response and metabolism in marine ectotherms.

The effects of climate change are altering the environmental landscape of marine habitats and exposing organisms to stressful conditions that may exceed their tolerance limits. Marine intertidal organisms are well adapted to fluctuating environments by adjusting energy metabolism and inducing the cellular stress response (CSR). Recent studies have shown that food availability can influence stress tolerance of marine ectotherms where a well-fed organism is more "robust" and more likely to survive a stressor ...

phylogenetic B2 subgroups in the infant gut microbiota: predominance of uropathogenic lineages in Swedish infants and enteropathogenic lineages in Pakistani infants.

segregates into phylogenetic groups, with group B2 containing both extraintestinal pathogenic (ExPEC) and enteropathogenic (EPEC) strains. Ten main B2 subgroups (I-X)/sequence type complexes (STcs), as well as EPEC lineages have been identified. In the current study, we characterized ExPEC and EPEC strains of phylogenetic B2 subgroups/STcs that colonize Swedish and Pakistani infants. Gut-commensal B2 strains, 120 from Swedish (N=87) and 19 from Pakistani (N=12) infants, were assigned to B2 subgroups. Carr...

High-throughput sequencing analysis of marine pioneer surface-biofilm bacteria communities on different PDMS-based coatings.

Marine biofilms, the attachment of marine microorganisms on artificial surfaces in natural seawater, play critical roles in the development of marine biofouling, which pave ways for the settlement and colonization of sessile invertebrate larvae. Despite the excellent microbe-inhibitory effect of polydimethylsiloxane (PDMS)-based coatings, marine bacteria could still attach to surfaces and form natural biofilms. However, there is little information available on the common structural features of pioneer surf...

Diversity of tryptophan halogenases in sponges of the genus Aplysina.

Marine sponges are a prolific source of novel enzymes with promising biotechnological potential. Especially halogenases, which are key enzymes in the biosynthesis of brominated and chlorinated secondary metabolites, possess interesting properties towards the production of pharmaceuticals that are often halogenated. In this study we used a PCR-based screening to simultaneously examine and compare the richness and diversity of putative tryptophan halogenase protein sequences and bacterial community structures...

Mytilidae as model organisms in the marine ecotoxicology of pharmaceuticals - A review.

Growing production and consumption of pharmaceuticals is a global problem. Due to insufficient data on the concentration and distribution of pharmaceuticals in the marine environment, there are no appropriate legal regulations concerning their emission. In order to understand all aspects of the fate of pharmaceuticals in the marine environment and their effect on marine biota, it is necessary to find the most appropriate model organism for this purpose. This paper presents an overview of the ecotoxicologica...

Beta diversity of gastrointestinal helminths in two closely related South African rodents: species and site contributions.

A fundamental aim of parasite ecology is to understand the mechanisms behind spatial variation in diversity and structure of parasite assemblages. To understand the contribution of individual parasite species and their assemblages to spatial variation in parasite communities, we examined species contributions to beta diversity (SCBD) and local contributions to beta diversity (LCBD) of parasitic gastrointestinal helminths (nematodes and cestodes) in two closely related rodents, Rhabdomys dilectus and Rhabdom...

Spatio-temporal patterns of the oceanic conditions and nearshore marine community in the Mid-Atlantic Bight (New Jersey, USA).

Oceanic environmental conditions influence, shape, and control the geographical range, spatial distribution, abundance, and size composition of marine fauna. Water temperature, salinity, dissolved oxygen, depth, and sediment type influence select fish life-history characteristics and community structure. Marine communities are vulnerable to major changes in environmental conditions, but the response and severity depends on various biological or ecological factors, such as resilience to stress or adaptation....

Environmental magnetic parameter characteristics as indicators of heavy metal pollution in the surface sediments off the Zhoushan Islands in the East China Sea.

The pollution of continental shelf sea sediments has always been an important issue for scientists because it can directly affect marine life and marine ecology. Thus, we carried out detailed studies of environmental magnetism and heavy metals in 145 surface sediment samples from the area southeast of the Zhoushan Islands in the East China Sea. The magnetic minerals in the sediments are mainly magnetite with a small amount of goethite and hematite. The magnetic mineral particles are mainly pseudosingle doma...


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