1,721,130 research outputs found
Indagini sulla distribuzione spaziale delle ovideposizioni di Tortrix viridana L. (Lepidoptera Tortricidae) in querceti della Sardegna. Terzo contributo: Disegno di campionamento in formazioni forestali a Quercus pubescens Willd
No full textIndagini sulla distribuzione spaziale delle ovideposizioni di Tortrix viridana L. (Lepidoptera Tortricidae) in querceti della Sardegna. Secondo contributo
No full textStatistical analysis of spatio-temporal fluctuation of Lymantria dispar L. population in N.E. Sardinian cork-oak region
No full textImpact of water and energy infrastructure on local well-being: an agent-based analysis of the water-energy-food nexus
No full textInvestments in infrastructure development are considered a key for economic growth, but their impact on well-being of rural populations is controversial. We propose an agent-based model to study the impact that water canals and electric grid development have on the Water-Energy-Food (WEF) nexus in a rural area. The analysis addresses the effects of hydropower infrastructure construction on basic needs satisfaction show the emergence of a competition for land between rural communities and water and energy sectors. Environmental heterogeneity is found to play a critical role, because physical exclusion and economic constraints may reduce the benefits of new service access for some intended beneficiares. These results have implications for government planning processes, as they emphasize the potential for infrastructure to cause appreciable, even if unintended, harm to local rural communities. The use of agent-based analysis like that presented here, can help to minimize unintended consequences and to inform compensation policies
Indagini sulla distribuzione spaziale delle ovideposizioni di Tortrix viridana L. (Lepidoptera Tortricidae) in querceti della Sardegna
No full textImpact of hydropower development on rural livelihood: An agent-based exploration
No full textDecisions on capital intensive hydrological infrastructure, including dams and canal-fed irrigation schemes, may have non-trivial effects on the behaviour and, ultimately, the well-being of local communities. We propose an interdisciplinary agent-based model to deepen the understanding of the impact of hydropower infrastructure investment on the water-energy-food nexus of local rural communities, focusing on food security in the context of a moderately sized hydropower and irrigation development in a developing country. The paper explicitly formalises the decision processes and the interactions between rural villages, districts and national governments in hierarchical and peer-topeer networks. The findings capture the consequences of the arising competition for water and land between new dam construction and local agricultural production. Results demonstrate that these dynamics can be further exacerbated by demographic pressures and climate change, leading to unsustainable consumption levels. However, these effects could be mitigated by prevention-oriented governmental policies such as investments in best practices and technological innovation, or by updating diet preferences, such increasing the consumption of food commodities with more efficient production
Analisi della distribuzione spaziale e campionamento delle ovideposizioni di Tortrix viridana L. (Lep. Tortricidae) in querceti della Sardegna
No full textTemperature influences on functional response of Coenosia attenuata (Diptera: Muscidae) individuals
No full textThe functional response of single Coenosia attenuta Stein (Diptera: Muscidae) adult females to Drosophila melanogaster (Meigen) adults has been investigated at different but constant temperatures and prey densities. The experiments were conducted in cages over a wide range of temperatures between 12 and 42 degrees C. At each experimental temperature, the number of attacks increases with increasing prey density up to a maximum attack rate referred to as demand rate. A ratio-dependent and demand-driven functional response model was appropriate to describe the attack rate at different temperatures. Both the demand and the search rate linearly increased with increasing temperatures throughout the range. Based on these results, a temperature- and prey density-dependent bidimensional attack rate model was developed and parameterized. The resulting response surface shows that C. attenuata is active over a wide range of temperatures (from approximately 12 to 36 degrees C) and attacks occur up to 42 degrees C. Thus, C. attenuata may be a promising biological control agent in Mediterranean greenhouses. To support this conclusion, further studies including the evaluation of spatial scale effects on the search rate and the consideration of the economically relevant whitefly prey are recommended
Solving constraint in water-energy-food nexus: the case of eucalyptus plantation in Ethiopia
No full textA generalization of the Incidence Function Model for metapopulations with fluctuating behaviour: an application to Lymantria dispar (L.) in Sardinia
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