Search results for "viljely"

Local knowledge and global justice : From hegemonic development to planetary well-being

2024

This chapter discusses the relationship between critical development studies and planetary well-being, showing how the former can add insights to the latter to build a comprehensive theory. Critical development studies is introduced as a field of study, which provides tools to uncover hidden power dynamics and ecologically destructive patterns in contemporary development. Development is analysed as a particular model of the good life, a societal programme, an epistemological system of power, and a global governance system. Using insights from critical development studies, the chapter points out differences between sustainable development and planetary well-being, noting that sustainable dev…

Sahalahden talonpoikaisten rusthollisukujen perhestrategiat 1721-1886

2006

Harjusistukkaiden luonnonravintolammikkoviljelyn kehittäminen : yhteenveto tutkimuksista vuosilta 1997-99 = Development of the culture of grayling st…

2002

Discharge management in fresh and brackish water RAS: Combined phosphorus removal by organic flocculants and nitrogen removal in woodchip reactors

2020

The current study combined P and N removal using organic flocculant chemicals and woodchip bioreactors in both freshwater and brackish water (7 ppm) recirculating aquaculture systems (RAS). The use of carbon (C) containing flocculant chemicals in the process was hypothesized to further stimulate C-demanding N removal (denitrification) in bioreactors. The trial of combined P and N removal consisted of four treatments: freshwater and brackish water RAS with and without the addition of supernatant from flocculation process to the woodchip reactor. Duplicate woodchip reactors were used per treatment and the trial was run for six weeks. 56 % and 49 % of P was removed from fresh and brackish slud…

Towards sustainable farming practices and food security: study about vulnerability of Finnish farms

2017

The aim of this paper is to discuss food security in the context of sustainable farming practices in Finland. There are two research questions: 1) How are the Finnish farms vulnerable from the viewpoint of food security? 2) How could they increase their resilience for guaranteeing food security in the future? The paper is based on a qualitative study for which 15 Finnish food system specialists were interviewed in 2015. According to the results, three types of vulnerabilities are discovered: 1) market vulnerabilities, 2) continuity of farms, and 3) environment changes. For reducing vulnerabilities, the re-evaluation of policy instruments is needed. At the same time, new knowledge and skills…

Ruokintarytmin vaikutus kuhan, Sander lucioperca (L.), kasvuun, ravinnonkulutukseen ja fysiologiaan

2008

Warming temperatures and ectoparasitic sea lice impair internal organs in juvenile Atlantic salmon

2021

As a consequence of climate change and open net-pen salmon farming, wild Atlantic salmon Salmo salar are increasingly likely to encounter elevated temperatures and parasite abundances during their early marine migration. Such stressors can compromise fitness by diminishing liver energy stores and impairing cardiac muscle. To assess whether temperature and infestation by salmon lice Lepeophtheirus salmonis are important correlates of liver energy stores and cardiac muscle performance in juvenile salmon, we experimentally infested fish at 3 abundances of louse infestation (zero, low, and high) and 5 temperatures (10, 13, 16, 19, and 22°C). At the end of the experiment (i.e. when sea lice reac…

Sequential infection can decrease virulence in a fish–bacterium–fluke interaction: Implications for aquaculture disease management

2019

Hosts are typically infected with multiple strains or genotypes of one or several parasite species. These infections can take place simultaneously, but also at different times, i.e. sequentially, when one of the parasites establishes first. Sequential parasite dynamics are common in nature, but also in intensive farming units such as aquaculture. However, knowledge of effects of previous exposures on virulence of current infections in intensive farming is very limited. This is critical as consecutive epidemics and infection history of a host could underlie failures in management practises and medical intervention of diseases. Here, we explored effects of timing of multiple infection on viru…

The effects of different combinations of fixed and moving bed bioreactors on rainbow trout (Oncorhynchus mykiss) growth and health, water quality and…

2019

The effect of bioreactor design on nitrification efficiency has been well studied, but less is known about the overall impacts on water quality. Besides nitrification, submerged fixed bed bioreactors (FBBR) trap fine solid particles, whereas moving bed bioreactors (MBBR) grind solids, possibly increasing solids and particle accumulation in the system. In this experiment, the effects of different combinations of fixed bed and moving bed bioreactors on water quality, solids removal, particle size distribution, fish health based on histopathological changes and nitrification efficiency were studied in laboratory scale recirculating aquaculture systems (RAS) with rainbow trout (Oncorhynchus myk…

Farming intensity indirectly reduces crop yield through negative effects on agrobiodiversity and key ecological functions

2022

International audience; Farming intensity and landscape heterogeneity influence agrobiodiversity and associated ecological functions. The relative contributions of these agroecosystem components to agricultural production remain unclear because of inter-relations and weather-dependant variations. Using a structural equation modelling approach, we estimated direct and indirect contributions of farming intensity (soil management, pesticide use and fertilisation) and landscape heterogeneity (of semi-natural covers and crop mosaic) to cereal crop production, in 54 fields (mostly wheat), in two years (24 and 30 fields). Indirect effects were evaluated through agrobiodiversity (carabid and plant …