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Displaying Results 1 - 25 of 84 on page 1 of 4
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A simple genetic identification method for northeast atlantic smoothhound sharks (mustelus spp.)
(2018)
Farrell, E. D.; Clarke, M. W.; Mariani, S.
A simple genetic identification method for northeast atlantic smoothhound sharks (mustelus spp.)
(2018)
Farrell, E. D.; Clarke, M. W.; Mariani, S.
Abstract:
Considerable ambiguity exists in the identification of the commercially valuable smoothhound sharks (Mustelus spp.) in the Northeast (NE) Atlantic. The lack of a clear and accurate method of identification prevents the collation of reliable species-specific landings and survey data for these fish and hinders the accurate delineation of the distribution ranges of species and stock boundaries, making it impossible to apply sound species-specific conservation and management strategies. This paper reports on the development of a multiplex PCR reaction that utilizes a set of mtDNA primers for the identification of Mustelus asterias, Mustelus mustelus, and Galeorhinus galeus. The high throughput method allows for the rapid and cost-effective identification of large numbers of samples; its application to 431 fish collected between 2006 and 2008 also raises important questions regarding the biogeography of the genus Mustelus in the NE Atlantic.
http://hdl.handle.net/10379/11417
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Age and growth estimates for the starry smoothhound (Mustelus asterias) in the Northeast Atlantic Ocean
(2010)
Farrell, E D; Mariani, S; Clarke, M W
Age and growth estimates for the starry smoothhound (Mustelus asterias) in the Northeast Atlantic Ocean
(2010)
Farrell, E D; Mariani, S; Clarke, M W
Abstract:
This study is the first to estimate age, growth and longevity of M. asterias based on interpretation of band pairs in sectioned vertebrae. Age and growth of 106 male and 114 female starry smooth-hound sharks (Mustelus asterias) were estimated by counting band pairs on unstained sectioned vertebrae. Growth curves were fitted to the length-at-age data using the von Bertalanffy and Gompertz models. The 1-parameter von Bertalanffy-L0 provided the best fit for males (L∞ = 104 cm TL, L0 = 30 cm TL and estimated K = 16 0.224) and females (L∞ = 133 cm TL, L0 = 30 cm TL and estimated K = 0.136). Longevity was estimated to be 11.8 and 20.2 years for males and females respectively. The length weight relationship is also presented for 304 male and 424 female M. asterias. The von Bertalanffy model was fitted to weight-at-age data. These estimates can form the basis of future work on the assessment and management of this species.
http://hdl.handle.net/10793/417
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Age and growth estimates for the starry smoothhound (mustelus asterias) in the northeast atlantic ocean
(2018)
Farrell, E. D.; Mariani, S.; Clarke, M. W.
Age and growth estimates for the starry smoothhound (mustelus asterias) in the northeast atlantic ocean
(2018)
Farrell, E. D.; Mariani, S.; Clarke, M. W.
Abstract:
Age, growth, and longevity were estimated for the starry smoothhound (Mustelus asterias), based on the interpretation of sectioned vertebrae of 106 males (35 - 104 cm stretch total length, STL) and 114 females (44 - 112 cm STL). Growth curves were fitted to length-at-age data using von Bertalanffy and Gompertz models. The three-parameter von Bertalanffy growth function (VBGF) provided the best statistical fit to the male data (L(infinity) = 103.7 cm STL, L(0) = 38.1 cm STL, k = 0.195 year(-1)). The Gompertz growth function provided the best statistical fit to the female data, although the estimated parameters were biologically unreasonable. Therefore, the three-parameter VBGF was also accepted for females (L(infinity) = 123.5 cm STL, L(0) = 34.9 cm STL, k = 0.146 year(-1)). Longevity was estimated to be 13 and 18.3 years for males and females, respectively. The length weight relationship is also presented for 304 male and 424 female M. asterias. The von Bertalanffy model was fitted ...
http://hdl.handle.net/10379/11420
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An assessment of multiple drivers determining woody species composition and structure: a case study from the Kalahari, Botswana
(2019)
Meyer, Thoralf; Holloway, Paul; Christiansen, Thomas B.; Miller, Jennifer A.; D’Odorico...
An assessment of multiple drivers determining woody species composition and structure: a case study from the Kalahari, Botswana
(2019)
Meyer, Thoralf; Holloway, Paul; Christiansen, Thomas B.; Miller, Jennifer A.; D’Odorico, Paolo; Okin, Gregory S.
Abstract:
Savannas are extremely important socio-economic landscapes, with pastoralist societies relying on these ecosystems to sustain their livelihoods and economy. Globally, there is an increase of woody vegetation in these ecosystems, degrading the potential of these multi-functional landscapes to sustain societies and wildlife. Several mechanisms have been invoked to explain the processes responsible for woody vegetation composition; however, these are often investigated separately at scales not best suited to land-managers, thereby impeding the evaluation of their relative importance. We ran six transects at 15 sites along the Kalahari transect, collecting data on species identity, diversity, and abundance. We used Poisson and Tobit regression models to investigate the relationship among woody vegetation, precipitation, grazing, borehole density, and fire. We identified 44 species across 78 transects, with the highest species richness and abundance occurring at Kuke (middle of the rainf...
http://hdl.handle.net/10468/8694
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An unintended experiment in fisheries science: a marine area protected by war results in mexican waves in fish numbers-at-age
(2018)
Beare, Doug; Hölker, Franz; Engelhard, Georg H.; McKenzie, Eddie; Reid, David G.
An unintended experiment in fisheries science: a marine area protected by war results in mexican waves in fish numbers-at-age
(2018)
Beare, Doug; Hölker, Franz; Engelhard, Georg H.; McKenzie, Eddie; Reid, David G.
Abstract:
Marine protected areas (MPAs) are attaining increasing importance in the management of marine ecosystems. They are effective for conservation in tropical and subtropical areas (mainly coral and rocky reefs), but it is debated whether they are useful in the management of migratory fish stocks in open temperate regions. World War II created a large marine area within which commercial fishing was prevented for 6 years. Here we analyse scientific trawl data for three important North Sea gadoids, collected between 1928 and 1958. Using statistical models to summarise the data, we demonstrate the potential of MPAs for expediting the recovery of over-exploited fisheries in open temperate regions. Our age-structured data and population models suggest that wild fish stocks will respond rapidly and positively to reductions in harvesting rates and that the numbers of older fish in a population will react before, and in much greater proportion, than their younger counterparts in a kind of Mexica...
http://hdl.handle.net/10379/10382
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Assessing the distribution and vulnerability of a seabird community at sea to inform conservation and management
(2018)
Critchley, Emma Jane
Assessing the distribution and vulnerability of a seabird community at sea to inform conservation and management
(2018)
Critchley, Emma Jane
Abstract:
Seabirds are an apex predator in marine ecosystems and can be important bio-indicators for informing wider marine conservation and management. They face many threats from anthropogenic activities at sea but the interactions and subsequent impacts can often be difficult to monitor, particularly in pelagic regions. Ireland and Britain in the north-eastern Atlantic Ocean host internationally important numbers of many seabird species. However, there are challenges in assessing their distribution at sea, not least the time and costs involved in trying to do this at the community level. The large territorial waters of both countries also provide significant prospective marine fossil fuels and renewable energy. Therefore, there is the potential for detrimental impacts to seabird populations where hotspots of seabird density overlap with marine energy activity. In this thesis I demonstrate how existing data can be combined to assess the at-sea distribution, vulnerability, and gaps in conser...
http://hdl.handle.net/10468/7822
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Assessment of the Impact of Ammonia Emissions from Intensive Agriculture Installations on Special Areas of Conservation and Special Protection Areas
(2020)
Kelleghan, David B.; Hayes, Enda T.; Everard, Mark; Curran, Thomas P.
Assessment of the Impact of Ammonia Emissions from Intensive Agriculture Installations on Special Areas of Conservation and Special Protection Areas
(2020)
Kelleghan, David B.; Hayes, Enda T.; Everard, Mark; Curran, Thomas P.
Abstract:
Atmospheric ammonia poses a significant threat to biodiversity and human health around the world. A high concentration can result in significant changes to the structure of ecosystems, as atmospheric ammonia is particularly harmful to a number of nitrogen-sensitive habitats (bogs, heath, semi-natural grasslands, etc.). In addition, ammonia reacts with other pollutants in the air to form particulate matter, which disperses over great distances. Atmospheric particulate matter has been linked to a range of pulmonary and cardiac issues in humans. Concentrations of ammonia in the air downwind of hotspot sources, such as pig and poultry farms, are likely to negatively affect the environment. The contribution of multiple sources of ammonia to cumulative impacts in Ireland is currently poorly understood. The AmmoniaN2K project aimed to assist the EPA licensing of intensive agriculture installations (pig and poultry farms) in Ireland. This work is particularly relevant to appropriate assessm...
http://hdl.handle.net/10197/11627
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Breeding bird species diversity across gradients of land use from forest to agriculture in Europe
(2017)
Koivula, Matti J.; Chamberlain, Dan E.; Fuller, Robert J.; Palmer, Stephen C. F.; Banko...
Breeding bird species diversity across gradients of land use from forest to agriculture in Europe
(2017)
Koivula, Matti J.; Chamberlain, Dan E.; Fuller, Robert J.; Palmer, Stephen C. F.; Bankovics, Attila; Bracken, Fintan; Bolger, Tom; de Juana, Eduardo; Montadert, Marc; Neves, Renato; Rufino, Rui; Sallent, Angel; Lopes da Silva, Luís; Leitão, Pedro J.; Steffen, Manfred; Watt, Allan D.
Abstract:
Loss, fragmentation and decreasing quality of habitats have been proposed as major threats to biodiversity world-wide, but relatively little is known about biodiversity responses to multiple pressures, particularly at very large spatial scales. We evaluated the relative contributions of four landscape variables (habitat cover, diversity, fragmentation and productivity) in determining different components of avian diversity across Europe. We sampled breeding birds in multiple 1-km2 landscapes, from high forest cover to intensive agricultural land, in eight countries during 2001−02. We predicted that the total diversity would peak at intermediate levels of forest cover and fragmentation, and respond positively to increasing habitat diversity and productivity; forest and open-habitat specialists would show threshold conditions along gradients of forest cover and fragmentation, and respond positively to increasing habitat diversity and productivity; resident species would be more strong...
http://hdl.handle.net/10344/6288
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Breeding bird species diversity across gradients of land use from forest to agriculture in Europe
(2018)
Koivula, Matti J.; Chamberlain, Dan E.; Fuller, Robert J.; Bracken, Fintan; Bolger, Tho...
Breeding bird species diversity across gradients of land use from forest to agriculture in Europe
(2018)
Koivula, Matti J.; Chamberlain, Dan E.; Fuller, Robert J.; Bracken, Fintan; Bolger, Thomas; et al.
Abstract:
Loss, fragmentation and decreasing quality of habitats have been proposed as major threats to biodiversity world-wide, but relatively little is known about biodiversity responses to multiple pressures, particularly at very large spatial scales. We evaluated the relative contributions of four landscape variables (habitat cover, diversity, fragmentation and productivity) in determining different components of avian diversity across Europe. We sampled breeding birds in multiple 1-km2landscapes, from high forest cover to intensive agricultural land, in eight countries during 2001-2002. We predicted that the total diversity would peak at intermediate levels of forest cover and fragmentation, and respond positively to increasing habitat diversity and productivity; forest and open-habitat specialists would show threshold conditions along gradients of forest cover and fragmentation, and respond positively to increasing habitat diversity and productivity; resident species would be more stron...
http://hdl.handle.net/10197/9467
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Capturing goats: documenting two hundred years of mitochondrial DNA diversity among goat populations from Britain and Ireland
(2017)
Cassidy, Lara M.; Teasdale, Matthew D.; Carolan, Sean; Enright, Ruth; Werner, Raymond; ...
Capturing goats: documenting two hundred years of mitochondrial DNA diversity among goat populations from Britain and Ireland
(2017)
Cassidy, Lara M.; Teasdale, Matthew D.; Carolan, Sean; Enright, Ruth; Werner, Raymond; Bradley, Daniel G.; Finlay, Emma K.; Mattiangeli, Valeria
Abstract:
The domestic goat (Capra hircus) plays a key role in global agriculture, being especially prized in regions of marginal pasture. However, the advent of industrialized breeding has seen a dramatic reduction in genetic diversity within commercial populations, while high extinction rates among feral herds have further depleted the reservoir of genetic variation available. Here, we present the first survey of whole mitochondrial genomic variation among the modern and historical goat populations of Britain and Ireland using a combination of mtDNA enrichment and high throughput sequencing. Fifteen historical taxidermy samples, representing the indigenous 'Old Goat' populations of the islands, were sequenced alongside five modern Irish dairy goats and four feral samples from endangered populations in western Ireland. Phylogenetic and network analyses of European mitochondrial variation revealed distinct groupings dominated by historical British and Irish samples, which demonstrat...
http://hdl.handle.net/10468/6523
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Repair and Conservation of the Four Courts Dome
(2018)
Pavia, Sara; Aly, Marwa
Repair and Conservation of the Four Courts Dome
(2018)
Pavia, Sara; Aly, Marwa
Abstract:
The Four Courts was built between 1786 and 1802. Fire events, the 1922 civil war, pollution and exposure have damaged the building?s fabric. A conservation project by the Office of Public Works focussed on the dome, an outstanding structure built with limestone, fire-clay brick and granite. This paper presents the results of the material?s investigation prior to the restoration. There were concerns that the new concrete dome, placed after the civil war, had altered the loading path of the original timber structure and was now transferring the weight of the roof onto the Portland stone and brick parapet. The similar compressive strengths of the original Portland stone in the dome (50 MPa) and the quarry stone (41-54MPa) suggest that there is little or no strength loss due to permanent loading in time therefore, the stone is probably not carrying any loads. The strength of the granite is lower than expected. This was mainly attributed to the use of granite boulders and the different s...
http://hdl.handle.net/2262/90358
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Challenges in assessing ecological impacts of construction and demolition waste on wetlands: a case study
(2018)
STAUNTON, J
Challenges in assessing ecological impacts of construction and demolition waste on wetlands: a case study
(2018)
STAUNTON, J
Abstract:
Although wetlands are of ecological and economic importance, they continue to be lost to anthropogenic activities such as infilling. The impacts of wetland infilling with construction and demolition (C&D) waste on wetland plant and dipteran (Insecta: Diptera) communities were examined. Areas of wetland infilled with C&D waste compared to non-infilled areas had: a) higher soil pH and lower soil moisture / organic content; b) a relatively higher percentage of ruderal plant communities; c) relatively fewer dipteran families that were wetland specialist, gall-forming, parasitic and haematophagous; d) relatively lower abundances and species richness of marsh flies (Diptera: Sciomyzidae). Challenges encountered during this study included locating C&D waste sites; obtaining permission from landowners to undertake this study; frequent damage and theft of equipment due to human interference, machinery and infilling activity. Given the current paucity of data regarding...
http://hdl.handle.net/10379/14006
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Chinese companies as “takers” and “makers” of sustainable development and corporate social responsibility in China
(2015)
Holzer, Constantin
Chinese companies as “takers” and “makers” of sustainable development and corporate social responsibility in China
(2015)
Holzer, Constantin
http://hdl.handle.net/10468/3499
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Climate Change and the Conservation of Archaeological Sites: a Review of Impacts Theory
(2011)
Daly, Caithleen
Climate Change and the Conservation of Archaeological Sites: a Review of Impacts Theory
(2011)
Daly, Caithleen
Abstract:
This article identifies the current state of knowledge in the literature regarding the possible impacts of future climatic change on archaeological sites and ensembles. Drawing on the literature review a matrix of potential impacts is collated to provide a simplified overview. This theoretical ‘menu’ is then tested by applying it to a vulnerability assessment of the World Heritage site of Skellig Michael in Ireland. The case study results reveal some knowledge gaps, particularly in regard to the impacts of climate change on buried archaeological remains.
https://arrow.dit.ie/beschrecart/8
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Competing discourses of built heritage: lay values in Irish conservation planning
(2016)
Parkinson, Arthur; Scott, Mark J.; Redmond, Declan
Competing discourses of built heritage: lay values in Irish conservation planning
(2016)
Parkinson, Arthur; Scott, Mark J.; Redmond, Declan
Abstract:
Built heritage conservation has traditionally been shaped by professionals through an 'authorised heritage discourse', emphasising expert knowledge and skills, universal value, a hierarchy of significance, and protecting the authenticity of tangible assets. However, while the purpose of built heritage conservation is widely recognised to be broad, encompassing cultural, social and economic benefits, it takes place in the presence, and on behalf, of a wider public whose values and priorities may differ starkly from those of heritage power-players. Drawing on the perspectives of a range of built heritage actors in three small towns in Ireland, this paper contributes to these debates, exploring the competing values and priorities embedded within lay discourses of heritage. Based on critical discourse analysis of interviews with local actors, the paper identifies that collected memory and local place distinctiveness, contributing to a sense of local identity, are of central im...
http://hdl.handle.net/10197/7693
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Conservation of Earthen Vernacular Architecture in Ireland Study of the Mechanical Properties and the Structural Behaviour of Cob
(2020)
JIMENEZ RIOS, ALEJANDRO
Conservation of Earthen Vernacular Architecture in Ireland Study of the Mechanical Properties and the Structural Behaviour of Cob
(2020)
JIMENEZ RIOS, ALEJANDRO
Abstract:
Cultural heritage is increasingly threatened not only by traditional causes of decay, but also by changing social, economic and environmental conditions. The deterioration or disappearance of any cultural item constitutes a harmful impoverishment of our heritage. Besides, culture has been recognized as an enabler and driver of sustainable development, peace and economic progress, which highlights the necessity of fostering its documentation, protection, and promotion. For all these reasons, working in the conservation of our cultural heritage should not only be justified but encouraged. The general objective of this PhD thesis is to contribute with the efforts to achieve Target 11.4 of the Sustainable Development Goals (SDG), adopted by the United Nations (UN) in 2015, by strengthening the efforts to protect and safeguard the world's cultural and natural heritage. The aim of the research is to increase awareness regarding the importance of vernacular architecture and its intrin...
http://hdl.handle.net/2262/91547
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Conservation Research and Policy with Non-Trivial Transaction Costs and Incomplete Contracting
(2009)
Steele, Scott R.
Conservation Research and Policy with Non-Trivial Transaction Costs and Incomplete Contracting
(2009)
Steele, Scott R.
Abstract:
Achieving conservation in the agricultural sector is difficult. The primary complicating factor is the large number of public-good environmental services that can potentially be provided by large numbers of individuals working the land under diverse economic and ecological circumstances. The complexity of the problem implies that additional consideration be given to transaction cost economics and the theory of incomplete contracting. The implications of incomplete contracting and transaction costs theory on the development, implementation, and evaluation of conservation policies are considered. Organizational analysis of the agricultural conservation problem yields three propositions and suggests unique research priorities.
http://hdl.handle.net/10379/327
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Defining 'Official' Built Heritage Discourses within the Irish Planning Framework: Insights from Conservation Planning as Social Practice
(2017)
Parkinson, Arthur; Scott, Mark J.; Redmond, Declan
Defining 'Official' Built Heritage Discourses within the Irish Planning Framework: Insights from Conservation Planning as Social Practice
(2017)
Parkinson, Arthur; Scott, Mark J.; Redmond, Declan
Abstract:
Conservation of built heritage is a key planning process and goal which shapes urban development outcomes across European cities. In Ireland, conservation of the built heritage is a key part of the planning framework, albeit one that is, in comparative terms, only recently established. While it is widely recognized that the underlying rationale for conservation of built heritage varies considerably (from cultural priorities to place marketing), the literature suggests that heritage and conservation professionals perform a key role in controlling decision-making through an official or 'authorized' heritage discourse (AHD), emphasizing expert values and knowledge and based around selective heritage storylines often reflecting elite tastes. Drawing on policy and practice in Ireland, in this paper, we contribute to these debates by further unpacking the AHD, exploring tensions within the heritage policy elite through examination of competing views and representations relating ...
http://hdl.handle.net/10197/8678
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Defining biological assemblages (biotopes) of conservation interest in the submarine canyons of the south west approaches (offshore united kingdom) for use in marine habitat mapping
(2018)
Davies, Jaime S.; Howell, Kerry L.; Stewart, Heather A.; Guinan, Janine; Golding, Neil
Defining biological assemblages (biotopes) of conservation interest in the submarine canyons of the south west approaches (offshore united kingdom) for use in marine habitat mapping
(2018)
Davies, Jaime S.; Howell, Kerry L.; Stewart, Heather A.; Guinan, Janine; Golding, Neil
http://hdl.handle.net/10379/11080
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Developing optimal strategies for limiting the spread of grey squirrels (Sciurus carolinensis) and conservation of reds (Sciurus vulgaris) in Ireland
(2016)
Flaherty, Margaret
Developing optimal strategies for limiting the spread of grey squirrels (Sciurus carolinensis) and conservation of reds (Sciurus vulgaris) in Ireland
(2016)
Flaherty, Margaret
Abstract:
Ireland has two species of squirrel, the native red squirrel (Sciurus vulgaris) and the non-native and invasive grey squirrel (Sciurus carolinensis). Since the initial introduction of the grey squirrel to a single site in the Irish midlands in 1911, it has spread to cover the eastern half of Ireland. Furthermore, red squirrels had disappeared from the areas in which the grey squirrels were longest established. This phenomenon has also occurred in Britain and Italy, and is the result of competition between the two species. In Britain the replacement of red squirrel populations has also been mediated by the squirrelpox virus (SQPV), a disease asymptotic in grey squirrels but lethal to reds. In Ireland, the continued displacement and disappearance of red squirrels has been attributed to the effects of competition only, but SQPV has recently been discovered in red squirrels in the east and north of Ireland. The continuing expansion of grey squirrel populations and displacement of red ...
http://hdl.handle.net/10379/5752
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Different shades of green? unpacking habitual and occasional pro-environmental behavior
(2018)
Lavelle, Mary Jo; Rau, Henrike; Fahy, Frances
Different shades of green? unpacking habitual and occasional pro-environmental behavior
(2018)
Lavelle, Mary Jo; Rau, Henrike; Fahy, Frances
http://hdl.handle.net/10379/12395
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End use level water and energy interactions: A large non-residential building case study
(2019)
Nair, Sudeep; Hashim, Hafiz; Hannon, Louise; Clifford, Eoghan
End use level water and energy interactions: A large non-residential building case study
(2019)
Nair, Sudeep; Hashim, Hafiz; Hannon, Louise; Clifford, Eoghan
Abstract:
Within the European Union, buildings account for around 40% of the energy use and 36% of CO2 emissions, thus representing a significant challenge in the context of recent EU directives that require all new buildings to be nearly zero-energy by 2020. Reduced consumption of water, and hot water in particular, provides a significant opportunity to reduce energy consumption. While there have been numerous studies pertaining to the water-energy nexus of residential buildings, the complexity of water networks in larger buildings has meant that this area has been relatively unexplored. The paper presents a comprehensive investigation of the hot water use profile, associated energy use, on-site pumping energy use, carbon emissions, and solar energy harvesting potential in an Irish university building over periods before and after water conservation efforts. Total water-related energy consumption (including the heating and pumping losses) were analysed using the WHAM model and modified pumpi...
http://hdl.handle.net/10379/15373
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Environmental geotechnics for peatland management and restoration
(2019)
O'Kelly, Brendan
Environmental geotechnics for peatland management and restoration
(2019)
O'Kelly, Brendan
Abstract:
Peatlands are dynamic eco-hydrological wetland systems, increasingly under threat worldwide due to natural and anthropogenic effects, including large-scale drainage and oxidation, causing their subsidence and ecological deterioration. In Europe, the requirements for conservation, restoration and long-term sustainability of degraded active bog have been accentuated by more stringent environmental policy and legislation. This paper describes how peat bunds(dams), strategically constructed at affected areas around the bog margins,can gradually re-establish the natural peatland hydrology and peat-forming vegetation through collection, storage and controlled release of surface runoff from the high bog. For geotechnical stability, the translational-type slip failure was identified as the critical case. The analysis must account for drying out of the compacted peat during drought periods and ensuing increases in l...
http://hdl.handle.net/2262/89386
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Evaluation of Red Grouse (Lagopus lagopus scoticus) habitat in the Connemara National Park
(2013)
Finnerty, Eugene J.; Dunne, James; McMahon, Barry J.
Evaluation of Red Grouse (Lagopus lagopus scoticus) habitat in the Connemara National Park
(2013)
Finnerty, Eugene J.; Dunne, James; McMahon, Barry J.
Abstract:
The Red Grouse is a red-listed species and as such is of conservation concern in Ireland. These species are typically breeding birds which have been in rapid decline over the last 25 years or whose populations have been severely reduced over the last 100 years (Newton et al. 1999). This study investigated the habitats that were utilised by grouse in the Connemara National Park from mid June to August 2005. Three sites were surveyed within the Park, each covering an area of 250m x 250m. Two of these sites contained evidence of grouse utilising the area (such as feathers and droppings) and a control site containing no evidence of utilisation by grouse. Each of the sites was surveyed for heather percentage cover, maximum heather height and growth form as well as its invertebrate fauna. Grouse diet was also studied by analysis of droppings. The percentage cover of heather and the maximum heather height on the sites with grouse was found to be higher than that of the control site. The ...
http://hdl.handle.net/10197/4457
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Factors influencing Hen Harrier Circus cyaneus territory site selection and breeding success
(2019)
Caravaggi, Anthony; Irwin, Sandra; Lusby, John; Ruddock, Marc; O'Toole, Lorcán; Me...
Factors influencing Hen Harrier Circus cyaneus territory site selection and breeding success
(2019)
Caravaggi, Anthony; Irwin, Sandra; Lusby, John; Ruddock, Marc; O'Toole, Lorcán; Mee, Allan; Nagle, Tony; O'Neill, Shane; Tierney, David; McCarthy, Alan; O'Halloran, John
Abstract:
Capsule: Our findings regarding Hen Harrier Circus cyaneus territory site selection and breeding success in Ireland offer an opportunity for the development of initiatives and conservation actions aimed at enhancing the suitability of upland areas for breeding Hen Harriers and ensuring the long-term persistence of the species.Aims: To investigate landscape-scale associations between habitat composition and Hen Harrier territory site selection, and to explore the influence of habitat and climate on breeding success.Methods: We used multi-model inference from generalized linear models and Euclidean distance analyses to explore the influence of habitat, topographic, anthropogenic and climatic factors on Hen Harrier territory selection and breeding success in Ireland, based on data from national breeding surveys in 2010 and 2015.Results: Hen Harrier territories were associated with heath/shrub, bog and pre-thicket coniferous forests. Comparisons between territories and randomly generate...
http://hdl.handle.net/10468/9473
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