Search results for "HAV"

Risk behavior of youth – social definition of risk

2020

Social defining of the risk behaviors is rooted in a diverse, multidimensional world of norms, values, rituals and discourses. Including social contexts of engaging in the risk behaviors and production of knowledge about them allowed us to go beyond standard cause-and-effect descriptions and examine these actions as an essential element of everyday practices and rituals of youth. The aim of this paper was to analyze the risk behaviors of youth in the framework of sociological categories of risk, reflexivity and interactional order. The paper is based on the results of the qualitative study conducted within the project “Problem Behaviors of Youth – Study in the Opole Region 2019–2020,” that …

Zadania ponadosobiste młodych a droga ku eudajmonii

2014

To enter or not to enter is not the question : a qualitative inquiry into the career experiences of next generation family members

2014

The use of digital analytics for measuring and optimizing digital marketing performance

2016

Demonstrating the monetary outcomes of marketing is no longer considered a virtue but a necessity by the top management. Marketers are increasingly held accountable for their actions, yet most marketers struggle in their attempts to measure marketing performance. The emergence of digital analytics tools (e.g., Web analytics) has raised optimism of improved measurability due to its ability to track customer behavior in the digital environment. However, research lacks a clear understanding of the opportunities and limitations of digital analytics, and what it takes from an organization to make the most of its usage. The dissertation advances the knowledge in this area by investigating how ind…

Zachowania finansowe dzieci - problem finansów czy psychologii? Dylematy metodologiczne

2016

Główny problem poruszony w artykule dotyczy tego, w jaki sposób badane jest uczestnictwo dzieci w rynku finansowym i ich możliwości wykazywania różnych zachowań finansowych. Niniejsze opracowanie stanowi próbę rozstrzygnięcia dylematu, czy zachowania finansowe dzieci powinny być przedmiotem badań w obrębie finansów czy raczej psychologii. Zwrócono w nim uwagę na zakres, w jakim badania takie były dotychczas prowadzone, a takżeq na to, i jakich wniosków dostarczały. W pracy przedstawiono odrębność metodologiczną badań oraz określono, jakich informacji dostarczają. Główna konkluzja opracowania sprowadza się do tego, że jakkolwiek badania zachowań finansowych dzieci w ujęciu psychologicznym i …

Long-term changes in pigmentation of arctic Daphnia provide potential for reconstructing aquatic UV exposure

2016

Abstract Despite the biologically damaging impacts of solar ultraviolet radiation (UV) in nature, little is known about its natural variability, forcing mechanisms, and long-term effects on ecosystems and organisms. Arctic zooplankton, for example the aquatic keystone genus Daphnia (Crustacea, Cladocera) responds to biologically damaging UV by utilizing photoprotective strategies, including pigmentation. We examined the preservation and content of UV-screening pigments in fossil Daphnia remains (ephippia) in two arctic lake sediment cores from Cornwallis Island (Lake R1), Canada, and Spitsbergen (Lake Fugledammen), Svalbard. The aims were to document changes in the degree of UV-protective p…

Phosphorus limitation enhances parasite impact: feedback effects at the population level

2014

Background Nutrient deficiency affects the growth and population dynamics of consumers. Endoparasites can be seen as consumers that drain carbon (C) or energy from their host while simultaneously competing for limiting resources such as phosphorus (P). Depending on the relative demands of the host and the parasite for the limiting nutrient, intensified resource competition under nutrient limitation can either reduce the parasite’s effect on the host or further reduce the fitness of the nutrient-limited host. So far, knowledge of how nutrient limitation affects parasite performance at the host population level and how this affects the host populations is limited. Results We followed the popu…

Oxidative stress biomarkers in the copepod Limnocalanus macrurus from the northern Baltic Sea : effects of hydrographic factors and chemical contamin…

2015

The importance of phytoplankton production for carbon budgets in a semiarid floodplain wetland

2011

Phytoplankton production (PP) in wetlands is not measured as often as that of macrophytes. A three year-study during a period of sustained high flooding was undertaken in a central Spanish floodplain wetland (Las Tablas de Daimiel National Park) to determine net PP, its spatial heterogeneity and controlling factors, and compare it with primary production in macrophyte communities. This enabled us to estimate carbon budgets for each community. All PP variables showed high spatial and temporal variability among sites, resulting in low coherence even when flooding connected all sites. Net PP corresponded to 25- 36% of submerged plant production and 3-10% of helophyte production. Net PP was con…

Browning-induced changes in trophic functioning of planktonic food webs in temperate and boreal lakes: insights from fatty acids

2022

AbstractThe effects of lake browning on trophic functioning of planktonic food webs are not fully understood. We studied the effects of browning on the response patterns of polyunsaturated fatty acids and n−3/n−6 ratio in seston and compared them between boreal and temperate lakes. We also compared the regional differences and the effects of lake browning on the reliance of zooplankton on heterotrophic microbial pathways and the mass fractions of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in zooplankton. Lake browning was associated with increasing phytoplankton biomass and concentrations of EPA and DHA in both temperate and boreal lakes, but the seston n−3/n−6 ratio was low…