Informing Marine Spatial Planning (MSP) with numerical modelling: A case-study on shellfish aquaculture in Malpeque Bay (Eastern Canada)

A moratorium on further bivalve leasing was established in 1999–2000 in Prince Edward Island (Canada). Recently, a marine spatial planning process was initiated explore potential mussel culture expansion in Malpeque Bay. This study focuses on the effects of a projected expansion scenario on productivity of existing leases and available suspended food resources. The aim is to provide a robust scientific assessment using available datasets and three modelling approaches ranging in complexity: (1) a connectivity analysis among culture areas; (2) a scenario analysis of organic seston dynamics based on a simplified biogeochemical model; and (3) a scenario analysis of phytoplankton dynamics based on an ecosystem model. These complementary approaches suggest (1) new leases can affect existing culture both through direct connectivity and through bay-scale effects driven by the overall increase in mussel biomass, and (2) a net reduction of phytoplankton within the bounds of its natural variation in the area.

Zmiany w systemach komunikacji akustycznej ptaków jako bioindykatory zmian w środowisku

Wydział Biologii

Ideologia da casa própria... sem casa própria: o Programa de Arrendamento Residencial na cidade de João Pessoa-PB

Brazilian Housing policy has always promoted homeownership. In 1999, a new form of housing promotion was set up in the country with the PAR (Programa de Arrendamento Residencial, or residential rental programme). This is a sort of leasing, in which a right to buy is granted at the end of contract. Again, with this, the final objective is homeownership. This dissertation aims at further understanding the role of PAR in the wake of the country s housing policies of the post-BNH period, analysing the case of João Pessoa, capital city of Paraíba state. By focusing in the city, it has been possible to analyse also the impact of the programme in the dynamics of the city s urban development. Accordingly, the analysis of PAR seeks to understand the programme s operational aspects as well as its location, urban and architectural aspects. The operational aspects refer to how the programme is operated, considering the differences to the other housing programmes in the country. The urban and architectural aspects refer to location, typology and construction characteristics of housing estates produced under the scheme. This study gives a general view of the country s recent housing policy and programmes and the specific characteristics of PAR, observing also its impacts in the city development

El arrendamiento financiero como instrumento no tradicional de inversión y financiamiento para la adquisición de equipo de alineado de vehículos para el desarrollo de la mediana empresa dedicada al servicio de reparación automotríz del área metropolítana de San Salvador.

El entorno o ambiente, que las pequeñas y medianas empresas afrontan en su diario vivir, está caracterizado por una elevada incertidumbre económica, política y social; agregando además los problemas de solvencia y liquidez; y las limitaciones en el acceso al crédito del sistema financiero. Partiendo de esto, las pequeñas y medianas empresas y en particular, las que se dedican al Servicio de Reparación Automotriz, deben de formularse o estructurarse los modelos de tomas de decisiones, basados en la Inversión de activos y la fuente de financiamiento adecuada para costear esos activos, así como la administración eficiente de los mismos. Dentro de este entorno, las instituciones financieras ofrecen servicios relacionados a nuevos proyectos y alternativas de financiamiento, decidiendo el empresario optar, por el que más se adapte a la realidad de su compañía. Pero, el Arrendamiento Financiero puede utilizarse en aquellas empresas, que tienen planeado la inversión de activos fijos, siendo así un instrumento de financiamiento e inversión alternativo. Por lo tanto, será estudiado con el fin de determinar en que medida el Arrendamiento Financiero, como instrumento no tradicional de inversión y financiamiento, para la adquisición de equipo de alineado de vehículos, contribuirá al desarrollo de la Mediana Empresa dedicada al servicio de reparación automotriz, en el Área Metropolitana de San Salvador. En tal sentido, se consideró pertinente estudiar y proponer el Arrendamiento Financiero como instrumento alternativo, para la adquisición de Activo Permanente y realizar un diagnóstico que determinara las fuentes de financiamiento usuales en las Medianas Empresas que operan en el sector automotriz, y con el soporte de instrumentos de recolección de datos como la encuesta poder concluir acerca de la utilización y expectativas del Arrendamiento Financiero por parte de dicho sector y así visualizar que el Leasing pueda llegar a tener una real factibilidad y aplicabilidad. Dentro de los principales resultados están: 1. Existe un potencial de necesidades de inversión por parte de las empresas dedicadas al servicio automotriz, debido a la diversidad en los servicios que demandan los principales clientes. 2. Los bienes que presentan mayor porcentaje de seleccionado para ser objeto de inversión por parte de las empresas del subsector automotriz, es en gran porcentaje el equipo de alineado, y dirigido para la expansión de su negocio, todo con el objeto de mantenerse vigentes con el mercado, o sea tener la tecnología de punta. 3. En cuanto al conocimiento del Leasing, la gran mayoría no tiene las bases para manejo y ni la experiencia de utilización de esta herramienta en decisiones de inversión; resultado de la poca información que existe en el ámbito financiero. Las recomendaciones formuladas a partir de las anteriores son: 4. Considerando que los propietarios de las medianas empresas de servicio automotriz, muestran disposición a la inversión en equipo, resulta conveniente realizar dicha inversión por medio del Arrendamiento Financiero, herramienta que proporciona diferentes beneficios como financiamiento del valor total del bien. 5. Con el objeto de realizar una inversión de equipo de alineado, se recomienda la aplicación de este modelo de implementación para la Adquisición de bienes por medio del Arrendamiento Financiero para facilitar las decisiones de equipamiento y lograr expandirse en el subsector y mejorar sus servicios. 6. Corresponde a las empresas arrendadoras dar a conocer mucho más sobre los procedimientos y requisitos para optar a realizar el leasing, así como por parte de los empresarios de conocer acerca de los beneficios que pueden obtener para sus empresas.

Using Authentic Materials to Teach Reading Conprehension

Se estudia el uso de textos auténticos y la elaboración de materiales para la enseñanza y aprendizaje de la comprensión de lectura. Se presenta un análisis de la información y de las teorías aceptadas por los expertos del área y su congruencia con los materiales que se encuentran en el mercado. Además, se analizan los intereses y necesidades de los estudiantes de la Universidad Nacional con el fin de que los profesores cuenten con las herramientas para identificar los textos más significativos para los estudiantes y así mejorar sus habilidades de lectura. The use of authentic texts is addressed for teaching reading comprehension as well as for creating materials to improve the teaching-learning process of this skill. The information and theories held by the experts in this field are discussed with regard to whether they correspond to the materials available in the market. In addition, results of needs analysis instruments applied to Universidad Nacional students are provided, so that instructors can have the tools to identify the readings that students may find more meaningful and therefore improve their reading skilis.

Selection and Passage of County Land Preservation Voter Referendum: The Role of Government

County jurisdictions in America are increasingly exercising self-government in the provision of public community services through the context of second order federalism. In states exercising this form of contemporary governance, county governments with “reformed” policy-making structures and professional management practices, have begun to rival or surpass municipalities in the delivery of local services with regional implications such as environmental protection (Benton 2002, 2003; Marando and Reeves, 1993). The voter referendum, a form of direct democracy, is an important component of county land preservation and environmental protection governmental policies. The recent growth and success of land preservation voter referendums nationwide reflects an increase in citizen participation in government and their desire to protect vacant land and its natural environment from threats of over-development, urbanization and sprawl, loss of open space and farmland, deterioration of ecosystems, and inadequate park and recreational amenities. The study’s design employs a sequential, mixed method. First, a quantitative approach employs the Heckman two-step model. It is fitted with variables for the non-random sample of 227 voter referendum counties and all non-voter referendum counties in the U.S. from 1988 to 2009. Second, the qualitative data collected from the in-depth investigation of three South Florida county case studies with twelve public administrator interviews is transformed for integration with the quantitative findings. The purpose of the qualitative method is to complement, explain and enrich the statistical analysis of county demographic, socio-economic, terrain, regional, governance and government, political preference, environmentalism, and referendum-specific factors. The research finds that government factors are significant in terms of the success of land preservation voter referendums; more specifically, the presence of self-government authority (home rule charter), a reformed structure (county administrator/manager or elected executive), and environmental interest groups. In addition, this study concludes that successful counties are often located coastal, exhibit population and housing growth, and have older and more educated citizens who vote democratic in presidential elections. The analysis of case study documents and public administrator interviews finds that pragmatic considerations of timing, local politics and networking of regional stakeholders are also important features of success. Further research is suggested utilizing additional public participation, local government and public administration factors.

Analysis of Land Use Change as a Method of Predicting Water Demands in an Urbanizing Environment: Redland, Miami-Dade County, Florida

The fluctuation in water demand in the Redland community of Miami-Dade County was examined using land use data from 2001 and 2011 and water estimation techniques provided by local and state agencies. The data was converted to 30 m mosaicked raster grids that indicated land use change, and associated water demand measured in gallons per day per acre. The results indicate that, first, despite an increase in population, water demand decreased overall in Redland from 2001 to 2011. Second, conversion of agricultural lands to residential lands actually caused a decrease in water demand in most cases while acquisition of farmland by public agencies also caused a sharp decline. Third, conversion of row crops and groves to nurseries was substantial and resulted in a significant increase in water demand in all such areas converted. Finally, estimating water demand based on land use, rather than population, is a more accurate approach.

Defending the 'public interest': an assessment of competing actor representations of 'solutions' to growing natural resource deficiencies.

This paper applies a SRT framework to the study of two case studies, namely the recent campaign of opposition to the legalization of hydraulic fracking in the State of New York and the more ongoing debate on land leasing in Africa. In relation to both campaigns, the analysis accounts for the arguments of a major financial institution and industry representatives who stress the safe and value-adding dimensions of these practices, as well as the views of opponents who refute the validity of industry's position and point to the unacceptable risks posed to the community, health and the environment. In spite of a number of obvious differences between these two case studies, not least differences arising from contrasting socio-economic and geo-political settings, there were also some notable similarities. First, was a tendency amongst protesters in both cases to formulate their role as contemporaries in a historically extended struggle for democratic justice. All perceived of themselves as guardians of their community's right to resist a corporate 'invasion' of their territories, like their forefathers and mothers before them. A theme of colonialism was explored in both settings through various identity and thematic anchoring devices that deliberately evoked shared understandings and historical memories of exploitation and human suffering. The evocation of powerful symbols of identity through visual narratives of protest further reinforced the cultural comprehensibility of opponents' message of protest in both contexts.

Rural change south of the river Bride in counties Cork and Waterford: the surveyors' evidence 1716–1851

Estate studies in Irish historical geography have been often designed to confirm or contrast local trends of development with those previously identified at the regional or sub-regional level. To date, little attention has been awarded to estate maps in studies of rural landscape change. It is a theme of this paper that the results yielded from a careful study of such estate maps can throw light on the results of the activities of the majority of estate residents. In this regard, it is fortunate that at Lismore surveys of the estate in 1716–17 and 1773–4 have survived, and a nineteenth century dimension is added by an analysis of the Valuation Office maps for 1851. This work is focused on a study of critical indicators of change, notably leasing arrangements, farm size, rate and type of enclosure, infrastructural development and settlement growth. These changes are reviewed within the framework of the dialectic that developed between landlord or landlord-inspired management policies and the forces released locally by the vast bulk of the population. Broadly this analysis indicates some of the potential rewards which may be secured by detailed scrutiny of estate maps in conjunction with other estate records.

Diet composition of a declining steppe bird the Little Bustard (Tetrax tetrax) in relation to farming practices

Foraging strategies and diet selection play an essential role in individual survival and reproductive success. The study of feeding ecology becomes crucial when it concerns endangered species such as the Little Bustard (Tetrax tetrax), whose populations are suffering strong declines as a consequence of agricultural intensification. Despite the fact that several populations are overwintering in areas affected by agricultural transformation, nothing is known about how feeding behavior responds to these changes. We studied for the first time the winter diet composition of the Little Bustard in Spain and compared it between areas with two different farming systems: dry and irrigated farmland. Diet was studied through the micro-histological analysis of 357 droppings collected in 16 locations across the wintering range of the Little Bustard in Spain. Up to 62 plant species were identified. Most consumed species were cultivated legumes (46.7%) and dicotyledon weeds (45.6%), while monocotyledons were scarcely consumed (7.7%). Diet composition differed significantly between dry and irrigated farmland areas. In irrigated areas, diet was mainly composed of legumes, in particular alfalfa (Medicago sativa). In contrast, in dry farmland areas diet was more diverse, composed mainly of weeds (Compositae, Papaveraceae, and Cruciferae) and also cultivated legumes, particularly vetch (Vicia sativa). These results suggest that legume crops could be an effective measure to improve habitat quality in areas with scarce food resources. However, in the case of irrigated areas, the strong reliance on alfalfa could make the Little Bustard more vulnerable to changes in land use. This study is the first step to understand the winter trophic requirements of the endangered Little Bustard, but further research is necessary to understand the food requirements of this species during the entire annual cycle.

Descripción de funcionamiento del área de sostenibilidad en Colombia caso de estudio Bancolombia

La Responsabilidad Social Empresarial renueva la concepción de la empresa, otorgando a ésta una dimensión amplia e integradora, que va más allá de la cuestión económica en la que se incorpora perfectamente la triple faceta de la sostenibilidad: económica, social y medioambiental. El término Responsabilidad Social Corporativa ha sido definido “La RSE es la integración voluntaria, por parte de las empresas, de las preocupaciones sociales y ambientales en sus operaciones comerciales y en sus relaciones con sus interlocutores”.

Hierarchical spatial segregation of two Mediterranean vole species: the role of patch‑network structure and matrix composition

According to ecological theory, the coexistence of competitors in patchy environments may be facilitated by hierarchical spatial segregation along axes of environmental variation, but empirical evidence is limited. Cabrera and water voles show a metapopulation-like structure in Mediterranean farmland, where they are known to segregate along space, habitat, and time axes within habitat patches. Here, we assess whether segregation also occurs among and within landscapes, and how this is influenced by patch-network and matrix composition. We surveyed 75 landscapes, each covering 78 ha, where we mapped all habitat patches potentially suitable for Cabrera and water voles, and the area effectively occupied by each species (extent of occupancy). The relatively large water vole tended to be the sole occupant of landscapes with high habitat amount but relatively low patch density (i.e., with a few large patches), and with a predominantly agricultural matrix, whereas landscapes with high patch density (i.e.,many small patches) and low agricultural cover, tended to be occupied exclusively by the small Cabrera vole. The two species tended to co-occur in landscapes with intermediate patch-network and matrix characteristics, though their extents of occurrence were negatively correlated after controlling for environmental effects. In combination with our previous studies on the Cabrera-water vole system, these findings illustrated empirically the occurrence of hierarchical spatial segregation, ranging from withinpatches to among-landscapes. Overall, our study suggests that recognizing the hierarchical nature of spatial segregation patterns and their major environmental drivers should enhance our understanding of species coexistence in patchy environments.

Can birds play a role as High Nature Value indicators of montado system?

Montados form a heterogeneous landscape of wooded matrix dominated by cork and/or holm oak with open areas characterized by fuzzy boundaries. Montado supports a high biological diversity associated to low intensity management and a landscape diversity provided by a continuous gradient of land cover. Among other features this permits the classification of montados as a High Nature Value (HNV) system. We assessed the role of birds as HNV indicators for montado, and tested several bird groups—farmland, edge, forest generalists and forest specialists species; and some universal indicators such as species conservation status, Shannon’s diversity index and species richness. Our study areas covered the North–South distribution of cork oak in Portugal, and we surveyed the breeding bird communities across 117 sampling sites. In addition to variables related to management and sanitary status, we considered variables that characterize the landscape heterogeneity inside the montado—trees and shrub density and richness of woody vegetation. Our results suggest that specific bird guilds can be used as HNV indicators of particular typologies of montado, and highlight the need to develop an indicator that could be transversally applied to all types of montado.

Propagation modelling and resource allocation in mobile radio communications

Over the past years, ray tracing (RT) models popularity has been increasing. From the nineties, RT has been used for field prediction in environment such as indoor and urban environments. Nevertheless, with the advent of new technologies, the channel model has become decidedly more dynamic and to perform RT simulations at each discrete time instant become computationally expensive. In this thesis, a new dynamic ray tracing (DRT) approach is presented in which from a single ray tracing simulation at an initial time t0, through analytical formulas we are able to track the motion of the interaction points. The benefits that this approach bring are that Doppler frequencies and channel prediction can be derived at every time instant, without recurring to multiple RT runs and therefore shortening the computation time. DRT performance was studied on two case studies and the results shows the accuracy and the computational gain that derives from this approach. Another issue that has been addressed in this thesis is the licensed band exhaustion of some frequency bands. To deal with this problem, a novel unselfish spectrum leasing scheme in cognitive radio networks (CRNs) is proposed that offers an energy-efficient solution minimizing the environmental impact of the network. In addition, a network management architecture is introduced and resource allocation is proposed as a constrained sum energy efficiency maximization problem. System simulations demonstrate an increment in the energy efficiency of the primary users’ network compared with previously proposed algorithms.