Algunos efectos metabólicos de la sustitución de proteínas por grasa en la dieta para truchas

Se han estudiado en truchas arco aris (Salmo gairdneri), los efectos que sobre la gluconeogénesis hepática, tiene el cambio de los porcentajes proteico y lipídico de la dieta y la inserción de cortos periodos de ayuno. La reducción del nivel proteico conlleva una disminución de la gluconeogénesis a partir de aminoácidos como lo n:!l.!estran las actividades de PEPCK y FDP-asa determinadas. La actividad transaminásica hepática durante los periodos de alimentación refleja la intensidad del anabolismo proteico, mientras que durante el ayuno dicha actividad está condicionada por el grado de catabolismo de los aminoácidos. La gluconeogénesis a partir de lactato no parece ser importante en condiciones de reposo muscular, al menos.The effects of diets with differents protein and fat levels on gluconeogenesis in rainbow trout (Salmo gairdneri) were studied. The insertion of short fasting periods was also considered. Reduction of protein level of the diet was accomplished to a reduced rate of gluconeogenesis as the lower activíties of PEPCK and FDP-ase have pointed out. During feeding periods the activity of liver transaminases studied reflects the intensity of protein anabolism, whereas during fasting periods, these activities are determined by the aminoacids catabolism rateo Gluconeogenesis from lactate seems to be a process of less importance, at least in muscular resting conditions

Influencia de la dieta sobre los niveles sanguíneos y hepáticos de diferentes metabolitos en la trucha

Se han determinado los niveles sanguíneos de glucosa, lactato, colesterol, ácidos grasos libres y cuerpos cetónicos así como los de glucógeno hepático en truchas a intervalos de dos horas durante un ciclo de 24 y tras suministrarles una dieta comercial de piscifactoría. Ninguno de los parámetros estudiados ha mostrado una respuesta clara a la comida, en contraste con lo que ocurre para alguno de ellos en mamíferos, lo cual pone de manifiesto una vez más las peculiaridades digestivas y metabólicas de la trucha.The evolution of the blood levels of glucose, lacta te, cholesterol, free fatty acids, ketonic bodies and liver glycogen content were determined in rainbow trout (Salmo gairdneri) at fixed intervals (2 hrs.) during a 24 hrs. period after a meal consisting in a commercial dieto None of the parameters studied show a definite response to food in contrast to that observed for sorne of these parameters in mammals. This fact provides a further evidence about the metabolic and digestive peculiarities of the trout

Segmenting consumers of meat and dairy products from five European countries: Implications for promoting sustainable food choices

Accelerating the transition of agri-food systems towards higher sustainability requires greater understanding of consumers’ decision-making related to sustainable food choices, together with competing drivers which may result in unsustainable food choice demand. Meat and dairy production systems negatively contribute to greenhouse gas targets, unless sustainable production methods are applied, and these are understood by consumers and used in food choices. The psychological factors determining consumers’ attitudes towards sustainably produced meat and dairy products were assessed. Data were collected through an online survey across five European countries (Czechia, Spain, Sweden, Switzerland, and the United Kingdom) (n = 2,490) in November 2021. The results showed consumers perceived food sustainability to be less important than sensory and healthiness attributes. UK consumers showed the strongest intentions to increase consumption of sustainably produced meat and dairy products. In contrast, Swiss consumers demonstrated the weakest intentions. A twostage cluster analysis based on consumers’ perceived attribute importance identified four distinct segments: low food involvement (19.6%), high food involvement (31.9%), price-sensitive (23.2%), and health- and sustainability-involved (25.3%) consumer segments. Respondents in low food involvement and price-sensitive consumer segments tended to be younger and have lower environmental preservation attitudes and were more prevalent in Switzerland and Czechia. Those in high food involvement and health- and sustainability-involved consumer segments perceived higher importance of food sustainability and were more prevalent in Spain and Sweden. These respondents expressed greater intentions to increase consumption of sustainably produced meat and dairy products, at the same time being more likely to recognise the utility of sustainability labelling information. Animal welfare information was perceived to be most important for respondents in all the segments with the exception of those in the price-sensitive consumer segment. Building on the results, recommendations for promoting consumer sustainable food choices are propose

Periodontal Disease and Nuclear and Oxidative DNA Damage

Oral health is an important aspect of the overall health status of an individual. DNA damage has been associated with oral health and dental factors due to the increased of oxidative stress (OxS). DNA damage can produce a wide range of effects on human health. These effects could appear immediately, but others do not become evident much later. Chronic diseases have been study to understand their mechanisms, clinical implications, and the development of secondary disease such as cancer. Periodontitis is one of the most common oral diseases. It is an inflammatory chronic infectious disease, which is characterized by the loss of supporting tissues and tooth loss caused by periodontopathogens and long-term release of reactive oxygen species (ROS); thus, oxidative stress is increased during periodontitis. Oxidative stress can produce DNA damage, including the oxidation of nucleosides, which could cause DNA strand break. This oxidative damage leads the formation of micronuclei (MN) a marker of nuclear damage. Also, oxidative stress increased 8-hydroxy-2′-deoxyguanosine levels which are the most common stable product of oxidative DNA damage

Citizen attitudes towards the environment and association with perceived threats to the countryside: evidence from countries in five European biogeographic zones

Citizens play a crucial role in attaining the United Nations 2030 sustainable development goals (SDGs). There is growing awareness of the importance of understanding citizen perspectives on environmental issues, in relation to developing and maintaining sustainable lifestyles, and in addressing perceived threats to protection and restoration of ecosystems and biodiversity. This analysis sought to understand people’s attitudes towards environmental conservation, how they relate to perceived threats to the countryside, and to determine how attitudes and perceived threats vary demographically and between countries. A survey was administered to citizens (quota sampled on age, gender, education, and split between rural and urban residency) across five countries representative of differing biogeographical regions (N=3,190): Czech Republic (n=649) (Continental); Spain (Mediterranean) (n=623); Sweden (Boreal) (n=645); Switzerland (Alpine) (n=641); United Kingdom (UK) (Atlantic) (n=632). Attitudes were measured using the Environmental Attitudes Inventory (EAI-24) on 2 factors (utilization; preservation) and perceived threat to the countryside on 1-factor (15 items). Multigroup regression analysis indicated that preservationist attitudes were associated with greater perceived threat to the countryside in all five countries. Higher perceived threat was associated with activities linked to environmental degradation, socio-economic uncertainty and risks in agri-food supply chains in all countries. The “bad behaviour of visitors” was the greatest perceived threat in the Czech Republic, Switzerland and the UK, while “lack of young farmers taking over farming” was the greatest perceived threat in Spain and Sweden. To promote pro-environmental attitudes and obtain greater public support for policies and interventions targeting environmental conservation, communication about environmental threats is needed, together with threat mitigation measures. Raising peoples’ awareness of threats to the countryside through targeted communications could promote pro-environment attitudes and potentially result in pro-environmental behaviours

Tipping points and farmer decision-making in European permanent grassland (PG) agricultural systems

Permanent grasslands (PG) provide multifunctional ecosystem services (ES) in Europe and globally, which are threatened by both increased farming intensity and land use change in marginal areas. Farm management decisions can represent critical thresholds, or behavioural “tipping points”, in the agricultural system. Decisions are influenced by a combination of agronomic, policy and social factors. Transformation of PG systems can be facilitated through positive tipping points and relevant policy implementation to ensure sustainable PG systems. The aim of this research was to understand the drivers of decisions regarding land use changes and management towards critical positive and negative tipping points across five biogeographic zones in Europe. Interview methodology assessed farmers’ preferences and priorities regarding the adoption of sustainable PG systems. Participants were selected from five case study countries, each representing a different biogeographic zone in Europe (Continental/Pannonian: Czech Republic, Boreal: Sweden, Mediterranean: Spain, Alpine: Switzerland, and Atlantic: UK). The sample also covered three farming intensity types within these biogeographic zones: high input/intensive conventional farms (≥1.0 LU /ha); low input/extensive conventional farms (<1.0 LU/ha); and certified organic farms. In total, 373 farm interviews were obtained from the case study countries between October 2020 and October 2021. The analysis focuses on drivers of change and considers tipping points across these countries, considering case studies of land use changes (specifically land abandonment) and land management practices (specifically changes in stocking rates). The most common reasons for PG management changes towards either intensification or extensification were economic. Farmers require policy support to increase provision of non-market ES, while rebalancing subsidies can deliver environmental ES at scale through abandonment (e.g., through the creation of specific habitats that support some threatened species). Agri-environment schemes (AES)and subsidies could be more flexible to allow farmers to better adapt grassland management to local production conditions and unpredictable circumstances such as droughts, floods, or market shocks. To maintain PG that delivers more goods and services, financial compensation for ES delivery was perceived to be the most significant support mechanism needed, while easier access to ES provision expertise through extension or consultancy services is considered important factor

Toxic elements in blood of red-necked nightjars (Caprimulgus ruficollis) inhabiting differently polluted environments

Toxic metals have been widely reported in avian tissues due to their well-known accumulation capacity and adverse effects. However, rare earth elements (REE) and other minor elements (ME) are becoming a new threat due to their use in modern technology. Presently, exposure data are limited and no studies have been reported in wildlife. The order Caprimulgiformes is among the most understudied groups of birds lacking blood ecotoxicological data. One major constraint is the small blood sample volume that can be collected to ensure animal welfare, which limits analyses. In order to shed light on these collective issues, we sampled 48 red-necked nightjars (Caprimulgus ruficollis) inhabiting three different scenarios of contaminant exposure (agricultural-urban area, n = 15; mining area, n = 17; and control area, n = 16) in southeastern Spain, and report for the first time concentrations of 50 elements (i.e. trace elements, ATSDR’s list toxic elements, REE and ME) using a recently developed technique able to analyze them by ICP-MS in very small volumes of blood (130 μL). Concentrations of As, Cd, Pb and Mn were significantly higher in individuals captured at the mining area compared to the other sites. Lead levels in the mine site were of particular concern since it was in the range of blood concentrations related to subclinical/clinical effects in other species, and in our study were associated with decreased hematocrit values (up to 44% hematocrit depression at blood concentrations >1000 ng/ml w.w.). Moreover, additive effects related to metal cocktail exposure in the mining area could be expected. Age and gender-related differences in blood concentrations were found for some elements. Even though most REE and ME concentrations were close to the LOQ, some of these emerging contaminants may trigger sublethal effects that, together with the ATSDR’s list toxic elements, need to be carefully evaluated in a future study.</p

Guide to the alien and invasive species of rivers, lakes and estuaries in the Iberian Peninsula.

Guide to the alien and invasive species of rivers, lakes and estuaries in the Iberian Peninsula