Academic literature on the topic 'Ecological Niche Factor Analysis'
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Journal articles on the topic "Ecological Niche Factor Analysis"
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Pettorelli, N., A. Hilborn, F. Broekhuis, and S. M. Durant. "Exploring habitat use by cheetahs using ecological niche factor analysis." Journal of Zoology 277, no. 2 (February 2009): 141–48. http://dx.doi.org/10.1111/j.1469-7998.2008.00522.x.
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Yorkina, Nadia, Katerina Maslikova, Olga Kunah, and Olexandr Zhukov. "ANALYSIS OF THE SPATIAL ORGANIZATION OF VALLONIA PULCHELLA (MULLER, 1774) ECOLOGICAL NICHE IN TECHNOSOLS (NIKOPOL MANGANESE ORE BASIN, UKRAINE)." Ecologica Montenegrina 17 (April 4, 2018): 29–45. http://dx.doi.org/10.37828/em.2018.17.5.
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The ecological niche of Vallonia pulchella (Muller, 1774) was investigated by means of the general factor analysis of GNESFA. It was revealed that the ecological niche of a micromollusk is determined by both edaphic factors and ecological features of vegetation. Ecological niche optima may be presented by integral variables such as marginality and specialization axes and may be plotted in geographic space. The spatial distribution of the Vallonia pulchella habitat suitability index (HSI) within the Technosols (sod-lithogenic soils on red-brown clays) is shown, which allows predicting the optimal conditions for the existence of the species.
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Afonin*, A. N., Yu Yu Kulakova, and Yu A. Fedorova. "Environmental niche modelling as tool for pest risk assessment." PLANT PROTECTION NEWS 104, no. 1 (April 19, 2021): 40–52. http://dx.doi.org/10.31993/2308-6459-2021-104-1-14422.
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The article reviews the concept and technology of pest risk assessment for the spread of quarantine species based on ecological and geographical analysis and ecological niche modeling. Using a quarantine species Ipomoea hederacea (L.) Jacq. as an example, we calculated the ecological requirements of the species. The main ecological factors limiting the spread of I. hederacea were determined and the ecological amplitudes of the species in relation to each factor limiting its distribution were quantitatively estimated. We identified ecologically suitable habitats and compiled a map of the ecological-geographical niche of the species using specially created environmental maps based on the obtained data of the ecological limits of the species. Using the map of the ecological-geographical niche, the I. hederacea distribution risk in the regions of the Russian Federation was estimated. Similar maps can be used for basis of quantitative as well as targeted risk assessment of penetration and establishment of harmful organisms. Obtained information will be useful to compile lists of quarantine species, estimate the potential areas of geographic distribution of pests into Russian Federation, and make decisions for introduction of effective phytosanitary measures to prevent the penetration of these invasive organisms. It can also be used as the basis for organizing and conducting phytosanitary monitoring in the Russian Federation.
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Xuezhi, Wang, Xu Weihua, Ouyang Zhiyun, Liu Jianguo, Xiao Yi, Chen Youping, Zhao Lianjun, and Huang Junzhong. "Application of ecological-niche factor analysis in habitat assessment of giant pandas." Acta Ecologica Sinica 28, no. 2 (February 2008): 821–28. http://dx.doi.org/10.1016/s1872-2032(08)60030-x.
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Triolo, Stefano, Daniela Campobello, and Maurizio Sarà. "Diurnal habitat suitability for a Mediterranean steppeland bird, identified by Ecological Niche Factor Analysis." Wildlife Research 38, no. 2 (2011): 152. http://dx.doi.org/10.1071/wr10185.
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Context The negative effects of agricultural intensification and policies, use of pesticides, fertilisers and mechanised harvesting on several populations of pseudo-steppe birds have increasingly required more detailed and effective habitat suitability models. Distribution models of farmland species are prone to incur recordings of false absence data. Ecological Niche Factor Analysis (ENFA) allows identification of environmental predictors of species distribution by using presence data only. Aims We quantified the diurnal habitat preferences and niche width of one steppe species, the stone curlew (Burhinus oedicnemus), with unfavourable conservations status in a Mediterranean area and reclassified a map with respect to habitat suitability classes according to the resulting distribution model. Methods Ecological Niche Factor Analysis was used with GIS cartography customised with habitat and anthropogenic variables recorded during field surveys carried out in four study plots (~500 ha) and at different spatial scales. Key results The stone curlew selected areas with low vegetation cover, such as fields following artichoke harvesting and tillage, close to rural buildings and unpaved roads. In contrast, the stone curlew avoided areas with high vegetation cover and areas highly disturbed by human-induced fires. The occurrence of natural vegetation was neither preferred nor avoided. The most robust model was based on a large-scale analysis (200 m from the bird location points), according to which the optimal area for stone curlew distribution during its breeding season was restricted to 1% of the entire study area. Conclusions Two uncorrelated factors, ‘marginality’ and ‘tolerance’, described the stone curlew’s niche in the area. The first index indicated selection for habitats that were marginal with respect to those available in the area, whereas the second indicated a species with a medium–wide environmental niche. In particular, the stone curlew occupied a much more restricted niche (low tolerance) in relation to individual variables. The use of customised databases at a large scale of analysis was found to more effectively reveal ecological requirements of this marginal and specialised species. Implications Our results allowed us to indicate practical land management actions for the stone curlew, such as prevention of human-induced fires and increase of pastoral activities. Our results indicated a potentially positive role of little-disturbed service roads along rural buildings in stone curlew distribution, which warrants further research. In addition, studies are needed to verify the presence of an ecological trap in artichoke fields, their preferred habitat. As we showed for the stone curlew, niche analyses conducted at a large scale using customised databases could greatly improve habitat suitability models of farmland species.
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Basille, Mathieu, Clément Calenge, Éric Marboutin, Reidar Andersen, and Jean-Michel Gaillard. "Assessing habitat selection using multivariate statistics: Some refinements of the ecological-niche factor analysis." Ecological Modelling 211, no. 1-2 (February 2008): 233–40. http://dx.doi.org/10.1016/j.ecolmodel.2007.09.006.
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Hirzel, A. H., J. Hausser, D. Chessel, and N. Perrin. "ECOLOGICAL-NICHE FACTOR ANALYSIS: HOW TO COMPUTE HABITAT-SUITABILITY MAPS WITHOUT ABSENCE DATA?" Ecology 83, no. 7 (July 2002): 2027–36. http://dx.doi.org/10.1890/0012-9658(2002)083[2027:enfaht]2.0.co;2.
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Zhukov, O. V., D. V. Kovalenko, S. S. Kramarenko, and A. S. Kramarenko. "Analysis of the spatial distribution of the ecological niche of the land snail Brephulopsis cylindrica (Stylommatophora, Enidae) in technosols." Biosystems Diversity 27, no. 1 (March 10, 2019): 62–68. http://dx.doi.org/10.15421/011910.
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The aim of our work is to describe the ecological niche of the land snail Brephulopsis cylindrica (Menke, 1828) in terms of the edaphic properties and properties of the vegetation cover and to show the spatial features of the variation of the habitat preference index within the artificial soil body – technosols (soddy-lithogenic soils on loess-like clays) using the ecological niche factor analysis (ENFA). The research was carried out at the Research Centre of the Dnipro Agrarian and Economic University in Pokrov. Sampling was carried out on a variant of artificial soil (technozems) formed on loess-like clays. The test site where the sampling was conducted consists of 7 transects of 15 samples each. Test points form a regular grid with a mesh size of 3 m. Soil mechanical impedance, aggregate-size distribution, soil electrical conductivity, vegetation physiognomic characteristics, and Didukh phytoindication scales were used as ecogeographic predictors of the mollusc’s ecological niche properties. Phytoindication assessment indicates that the technosol ecological regimes are favourable for sub-mesophytes, hemi-hydrocontrastophiles, neutrophiles, semi-eutrophs. The test for statistical significance showed that an axis of marginality of the ecological niche of B. cylindrica and axes of specialization are significantly different from the random distribution. We found that the ecological niche of the mollusc is determined by both edaphic factors and ecological features of vegetation. The marginality of B. cylindrica ecological niche over the entire period of study is determined mainly by preferences for physiognomic vegetation types, higher values of the continentality and thermality regimes. Often greater content in the soil of aggregates 1–3 mm in size coincides with greater numbers of B. cylindrica individuals. Individuals of this species avoid physiognomic type III and areas with higher soil alkalinity and mineralization detected both by means of the phytoindication approach and soil electrical conductivity data. Ecological niche optima may be presented by integral variables such as marginality and specialization axes and plotted in geographic space. The spatial distribution of the B. cylindrica habitat suitability index (HSI) within the technosols is shown, which makes it possible to predict the optimal conditions for the existence of the species.
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Carrascal, Luis M., Eulalia Moreno, and Ingrid M. Mozetich. "Ecological plasticity of morphological design: an experimental analysis with tit species." Canadian Journal of Zoology 73, no. 11 (November 1, 1995): 2005–9. http://dx.doi.org/10.1139/z95-236.
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To determine whether behavioural plasticity in foraging modes is contingent upon the morphology of the species, we analyzed the variability in frequency of use of foraging postures (standing versus hanging) under the selection pressure of predation risk. We studied the leg morphology of two contrasting tit species (Blue Tit, Parus caeruleus, and Crested Tit, P. cristatus). Results demonstrated that the leg morphology of the Blue Tit provides it with greater ecological plasticity in terms of foraging posture than that of the Crested Tit. Observed interspecific differences in ecological plasticity are not attributable to interspecific differences in morphological variability (between individuals within species). The morphofunctional bases of ecological plasticity in foraging posture are discussed. Morphological design may be considered an important factor in explaining niche width and potential for niche shifts, as morphology might determine the range of ecological "space" within which a species is allowed to move. The same niche shift in different species could represent different costs when morphological constraints are considered in relation to behavioural performance.
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Praca, E., and A. Gannier. "Ecological niche of three teuthophageous odontocetes in the northwestern Mediterranean Sea." Ocean Science Discussions 4, no. 5 (October 10, 2007): 785–815. http://dx.doi.org/10.5194/osd-4-785-2007.
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Abstract. In the northwestern Mediterranean Sea, sperm whales, pilot whales and Risso's dolphins prey on cephalopods exclusively or preferentially. In order to evaluate their competition, we modelled their habitat suitability with the Ecological Niche Factor Analysis (ENFA) and compared their ecological niche using a discriminant analysis. We used a long term (1995–2005) small boat data set, with visual and acoustic (sperm whale) detections. Risso's dolphin had the shallowest and the more spatially restricted principal habitat, mainly located on the upper part of the continental slope (640 m mean depth). With a wider principal habitat, at 1750 m depth in average, the sperm whale used a deeper part of the slope as well as close offshore waters. Finally, the pilot whale has the most oceanic habitat (2500 m mean depth) mainly located in the central Ligurian Sea and Provençal basin. Therefore, potential competition for food between these species may be reduced by the differentiation of their ecological niches.
Dissertations / Theses on the topic "Ecological Niche Factor Analysis"
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Williams, Alison Kay. "The influence of probability of detection when modeling species occurrence using GIS and survey data." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/11129.
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I compared the performance of habitat models created from data of differing reliability. Because the reliability is dependent on the probability of detecting the species, I experimented to estimate detectability for a salamander species. Based on these estimates, I investigated the sensitivity of habitat models to varying detectability.
Models were created using a database of amphibian and reptile observations at Fort A.P. Hill, Virginia, USA. Performance was compared among modeling methods, taxa, life histories, and sample sizes. Model performance was poor for all methods and species, except for the carpenter frog (Rana virgatipes). Discriminant function analysis and ecological niche factor analysis (ENFA) predicted presence better than logistic regression and Bayesian logistic regression models. Database collections of observations have limited value as input for modeling because of the lack of absence data. Without knowledge of detectability, it is unknown whether non-detection represents absence.
To estimate detectability, I experimented with red-backed salamanders (Plethodon cinereus) using daytime, cover-object searches and nighttime, visual surveys. Salamanders were maintained in enclosures (n = 124) assigned to four treatments, daytime__low density, daytime__high density, nighttime__low density, and nighttime__high density. Multiple observations of each enclosure were made. Detectability was higher using daytime, cover-object searches (64%) than nighttime, visual surveys (20%). Detection was also higher in high-density (49%) versus low-density enclosures (35%).
Because of variation in detectability, I tested model sensitivity to the probability of detection. A simulated distribution was created using functions relating habitat suitability to environmental variables from a landscape. Surveys were replicated by randomly selecting locations (n = 50, 100, 200, or 500) and determining whether the species was observed, based on the probability of detection (p = 40%, 60%, 80%, or 100%). Bayesian logistic regression and ENFA models were created for each sample. When detection was 80 __ 100%, Bayesian predictions were more correlated with the known suitability and identified presence more accurately than ENFA.
Probability of detection was variable among sampling methods and effort. Models created from presence/absence data were sensitive to the probability of detection in the input data. This stresses the importance of quantifying detectability and using presence-only modeling methods when detectability is low. If planning for sampling as an input for suitability modeling, it is important to choose sampling methods to ensure that detection is 80% or higher.Ph. D.
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Storey, Liza Preethy. "Effects of climate and land use change on invasive species a case study of Tradescantia fluminensis (Vell.) in New Zealand /." The University of Waikato, 2009. http://hdl.handle.net/10289/2634.
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Climate change, land use change and invasive species are transforming global biodiversity at multiple scales. Projections are for threats to biodiversity from these global changes to continue into the future, with varied and discernible distribution changes for many species. Concomitantly, these global changes will interact with each other to further exacerbate the problem, as exemplified in this study. In New Zealand, climate change is expected to affect landscapes, fragmented and disturbed by land use change, further increasing the potential invasibility of these landscapes for a suite of existing and emerging invasive species. This thesis is concerned with the combined effects of climate and land use changes on the spatial distribution of the sub-tropical invasive plant, Tradescantia fluminensis (Vell.). The contribution of this thesis is to undertake an integrated assessment of the distribution change for this species in New Zealand. On the basis that climatic variables affect species distribution at larger scales, while land use, habitat, disturbance and dispersal mechanisms affect distribution at smaller scales, two separate analyses were undertaken. At the national scale BioCLIM and the Ecological Niche Factor Analysis (ENFA) were implemented using the variables: minimum temperature (July-August), MTminJ-A, and annual water deficit (November-February). At the landscape scale, only ENFA was implemented, using the variables: MTminJ-A, ECOSAT riparian classes (habitat) and proximity to roads, urban areas and streams (disturbance and dispersal sources). Three scenarios of climate change (CCSR B1-Low, CSIRO9 A1B-Mid and HadCM A1FI-High) and two scenarios of land use change (SmartGrowth and Buildout) were developed to the year 2050, using the CLIMPACTS Open Framework Modelling System and Geographic Information Systems, GIS, techniques respectively. The baseline species distribution model was extrapolated in ENFA, using the 2050 scenarios. Changes to potential threat from this species to protected areas at the landscape level were assessed spatially at the landscape level. This approach and its results are novel for this species. At the national scale the results for the modelling show that climate change will increase the potential habitat suitability of Tradescantia under all combined scenarios of CCSR, CSIRO9 and HadCM for mean minimum temperature (July-August), MTminJ-A and Annual Water Deficit, AWD. At the case study landscape, in the Western Bay of Plenty and Tauranga also the modelling results showed that climate change and land use changes will increase the suitability for Tradescantia by 2050. The 'core' or highest suitability areas increase under all future scenarios. At the national level core suitability increased by about 13% for the CCSR:B1-Low and CSIRO9:A1B-Mid and 22% for HadCM:A1FI-High combined scenario on the North Island. On the South Island, core areas increased by a much lower margin - 1.4%, 2.3% and 2.9% for CCSR:B1-Low, CSIRO9:A1B-Mid and HadCM:A1FI-High combined scenarios respectively. At the landscape level core areas increased by 5%, 8% and 21% for the CCSR:B1-Low+SmartGrowth, Darlam:A1b-Mid+SmartGrwoth and HadCM:A1FI-High+Build-out combined scenarios, respectively. This is true also for the Protected areas within the case study landscape, and indicate that the increasing if Tradescantia is able to track both climate and land use change through its dispersal and migration within the landscape 9 primarily in the inland and upland direction), then is will pose a greater risk to native habitats than at present. Integrated assessments and the outputs they produce are essential to exploring anticipated changes (through scenario-building) and in understanding the change spatial context and magnitude of projected changes from the combined effects of climate and land use changes into the future and need to be integrated into biodiversity-biosecurity management at multiple scales.
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Whitehead, Joanna K. "Breeding success of adult female kakapo (Strigops habroptilus) on Codfish Island (Whenua Hou) : correlations with foraging home ranges and habitat selection." Lincoln University, 2007. http://hdl.handle.net/10182/640.
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Kakapo (Strigops habroptilus) are a flightless, nocturnal parrot endemic to New Zealand. Thought to be extinct within their natural range, kakapo are currently listed as nationally critical. The current population of 86 individuals is managed by the Department of Conservation’s National Kakapo Team on two offshore islands in southern New Zealand, with all females of breeding age on Codfish Island (Whenua Hou). Kakapo only breed once every two to five years, coinciding with the mast fruiting of specific plant species. On Codfish Island, the proportion of adult female kakapo that breed in rimu (Dacrydium cupressinum) fruiting years is dependent on the quantity of fruit produced, with fewer females attempting to breed during low mast years. The purpose of this research is to investigate why only some adult female kakapo breed in low rimu fruiting years on Codfish Island, specifically assessing if foraging home range size and/or habitat selection influence breeding. A total of 506 location points were collected at night for 18 adult female kakapo between March and May 2006. These were used to estimate foraging home ranges and to assess if kakapo select for particular types of vegetation. Ecological Niche Factor Analysis was used to determine the relative importance of habitat variables in the distribution of female kakapo and to predict areas of suitable breeding habitat when rimu fruit is limited. The breeding success of individuals in 2005, a low rimu mast year, was used to identify if differences in home ranges or habitat selection occurred between breeding and non-breeding females. The large variation in foraging home range sizes recorded in this research was consistent with previous studies. Foraging home range sizes were on average twice the size for breeders than for non-breeders, suggesting that adult female kakapo may be limited in their ability to breed by the size of the area they occupy. Adult female kakapo did not randomly use vegetation on Codfish Island as some vegetation types were not used, while others were common inside foraging home ranges. Adult female kakapo utilise a broad niche and are capable of surviving in a wide range of habitats. However, breeding females were more specialised in their niche requirements than non-breeders, with breeders utilising areas with higher abundances of mature rimu trees. Females occurred in high elevation, flat areas of the island but this may have been because this is where appropriate vegetation types occurred. During low rimu mast years, breeding adult females were predicted to occupy habitat in high elevation, plateau areas with a high abundance of rimu. Areas identified as sub-optimal habitat for breeding included the coastal areas, the lower elevation area of the main valley and some ridgelines. The home ranges of all 10 breeding females contained some optimal habitat, while females who did not breed were more likely to be located in sub-optimal habitat. Although there were significant areas of optimal breeding habitat not occupied by adult female kakapo, other kakapo may have been present in these areas. To increase the proportion of females that breed in low rimu mast years, it may be necessary to remove sub-adult females or surplus adult males living in optimal breeding habitat from the island. Alternatively, females in sub-optimal breeding habitat could be fed supplementary foods or transferred to other islands where there is unoccupied suitable breeding habitat available.
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Lefevre, Robert E., and Kevin Halverson. "Ecological Sustainability Analysis of the Coronado NF: Describing the Ecological Niche of the Forest for Water and Riparian Resources." Arizona-Nevada Academy of Science, 2007. http://hdl.handle.net/10150/296684.
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Kulhanek, Stefanie. "Investigating the use of invasion history, meta-analysis and niche-based models as tools for predicting the ecological impacts of introduced aquatic species." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66655.
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Biological invasions pose a major threat to global biodiversity. While there is increasing concern regarding the impacts caused by non-indigenous species (NIS), generalisable tools for predicting their ecological effects have yet to be developed. Several researchers have suggested that examining the previously documented effects of NIS, termed invasion history, can serve as a basis for forecasting future impacts. Yet, while predictive models for impact have been devel oped based on the invasion histories of several widespread invaders, the generalisability of such approaches has not been demonstrated. The severity of the impacts caused by NIS may vary as a function of their local abundance across invaded sites. Thus by estimating the expected abundance of introduced species, at potential recipient locations, we may be able to identify habitats which are particularly vulnerable to their effects. While ecological niche-based models (ENM) have often been used to predict the abundance of species within their native ranges, such approaches have rarely been applied to NIS. In this thesis I conduct an extensive literature review, using 19 aquatic species, and assess the utility of invasion history for predicting future impacts. I illustrate that, while for most NIS limited and heterogeneous data currently inhibits the development of quantitative predictions, invasion history can often reveal the type and direction of future impacts. Using one of these species, Cyprinus carpio, as a case study, I conduct a meta-analysis and demonstrate that, where data is available, models incorporating NIS biomass can explain a substantial amount of variation in the severity of impacts across invaded locations. I then develop neural network-based ENM to forecast both the occurrence and biomass of C. carpio in a portion of its invaded range, using monitoring data from Minnesota. I test the ability of the resulting models to geneLes invasions biologiques posent un risque majeur pour la biodiversité mondiale. Malgré qu'il y ait un intérêt grandissant concernant les impacts causés par les espèces non indigènes (ENI), des outils de prédictions de leurs effets écologiques restent encore à être développés. Plusieurs chercheurs ont suggéré que l'étude des impacts antérieurs des ENI, nommé historique d'invasion, pourrait servir en tant que référence pour prédire leurs effets futurs. Et malgré que des modèles de prédictions aient été développés selon l'historique d'invasion de certaines espèces envahissantes notoires, la précision globale de tels outils reste à être démontrée. La sévérité des impacts causés par les ENI peut varier selon leur abondance à travers des milieux envahis. Ainsi, par la prédiction de l'abondance des ENI, à travers des sites potentiellement envahissables, nous devrions être en mesure d'identifier les habitats particulièrement vulnérables face à leurs effets. En dépit que les modèles de niches fondées écologiques (MNE) aient souvent été utilisés pour prédire l'abondance des espèces dans leur aire de répartition d'origine, de telles approches ont rarement été mises en application envers des ENI. Dans cette thèse, j'entreprends une revue étendue des publications scientifiques concernant les ENI. En utilisant 19 espèces aquatiques comme échantillon, j'évalue l'utilité de l'historique d'invasion comme outil pour prévoir leurs impacts futurs. Je démontre que la plupart des données sur les impacts des ENI sont restreintes et hétérogènes, limitant le développement des prédictions quantitatives, mais que l'historique d'invasion peut souvent révéler le type et la direction et des impacts futurs. En utilisant un de ces ENI, Cyprinus carpio, comme sujet d'étude, je conduis une méta analyse et démontre que, où les données sont disponibles, les mod
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Messias, Patrícia. "Delimitação de espécies do complexo Aspidosperma pyrifolium Mart. & Zucc. (Apocynaceae)." Botucatu, 2019. http://hdl.handle.net/11449/182518.
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Orientador: Ingrid KochResumo: Aspidosperma pyrifolium Mart. & Zucc. é uma espécie com distribuição ampla e disjunta, variação morfológica e taxonomia complexa. Neste estudo é tratada como um complexo de espécies, e utilizada como modelo para delimitação de espécies através de múltiplos critérios operacionais (genéticos, morfológicos e ecológicos). Consideramos que espécies são segmentos de linhagens de uma metapopulação evoluindo separadamente, pois este é um conceito universal que diminuiu as visões conflitantes do que é considerado espécie. Realizamos análises filogenéticas com dados concatenados (ITS e rpl32-trnL) e de coalescência para testar o monofiletismo do complexo e seus grupos. Desenvolvemos marcadores microssatélites polimórficos para A. pyrifolium usados na avaliação da diversidade genética e estruturação de cinco populações naturais. Analisamos a morfologia através de morfometria, incluindo características quantitativas, tanto vegetativas quanto reprodutivas. As análises ecológicas, incluíram modelagem e testes de similaridade de nicho ecológico. Nossos resultados recuperaram o complexo A. pyrifolium como monofilético, com 3 subclados relacionados a regiões geográficas e vegetações específicas, resultados também corroborados na árvore de espécies. O clado 1 ocorre na Caatinga no Nordeste do Brasil, o clado 2 nas manchas de Floresta Estacional na região Centro-Oeste no Brasil e clado 3 na vegetação chaqueana no Mato grosso do Sul, Paraguai e Bolívia. Todas as análises de estrutura populaciona... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Aspidosperma pyrifolium Mart. & Zucc. is a species with wide distribution and disjunct, morphological variation and complex taxonomy. In this study, we treated it as a species complex, and used as a model for species delimitation using multiple operational criteria (genetic, morphological and ecological). We consider species as segments of separately evolving metapopulation lineages, since this is a universal concept that diminished the conflicting visions of what is considered species. For this, we performed phylogenetic with concatenated data (ITS and rpl32-trnL) and coalescence analyzes to test the monophyly of the complex and its groups. We developed polymorphic microsatellites for complex A. pyrifolium for evaluated the genetic diversity and structure of five natural population. We analyzed morphology through morphometry, including quantitative characteristics, both vegetative and reproductive. The ecological analyzes included modeling and testing of ecological niche similarity. Our results recovered Aspidosperma pyrifolium complex as monophyletic, with 3 subclades related to geographic regions and specific vegetation, results also corroborated in the species tree. Clade 1 occurs in the Caatinga in Northeast Brazil, clade 2 in the Seasonal Forest patches in the Center-West region of Brazil and clade 3 in the Chaqueana vegetation in Mato Grosso do Sul, Paraguay and Bolivia. All analyzes of population structure suggested the formation of two genetic groups, one with the po... (Complete abstract click electronic access below)
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Bachmann, Beatrice Yvonne [Verfasser], Martin [Akademischer Betreuer] Kappas, and Oliver [Akademischer Betreuer] Tackenberg. "Extraction and Analysis of Baseline Data for Protected Area Management Using Geographic Information Systems, Remote Sensing and Ecological Niche Modeling : Case Study: Armando Bermúdez National Park in the Cordillera Central of the Dominican Republic / Beatrice Yvonne Bachmann. Gutachter: Martin Kappas ; Oliver Tackenberg. Betreuer: Martin Kappas." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2012. http://d-nb.info/1042346542/34.
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Souza, Renato Pereira de. "Filogeografia da febre amarela na América do Sul." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/6/6132/tde-19042013-141517/.
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Os Flavivírus são vírus de 40 50 nm de diâmetro, com formas esféricas e RNA de fita simples, com sentido positivo e aproximadamente 11 kb de comprimento. O Vírus da Febre Amarela, protótipo do grupo, é o agente causador da Febre Amarela, uma antiga doença que causou epidemias generalizadas na África, Américas do Norte e do Sul e Europa do século XVII ao início do século XX, e depois ressurgiu nas últimas décadas na África sub- saariana e América do Sul tropical. O presente trabalho busca a reconstrução da transmissão da Febre Amarela na América do Sul, no tempo e espaço, em especial, considerando a provável influência das populações humanas, primatas não humanos e mosquitos, na evolução e distribuição das linhagens genéticas de Febre Amarela, aplicando modelos de inferência Bayesiana para análises filogenéticas e filogeográficas e testando hipóteses de distribuição geográfica com modelagem de nicho ecológico. Os dados dão poucas evidências de que as estratégias de vacinação vigentes tenham efetivamente colaborado para a diminuição da ocorrência de Febre Amarela, indicando possíveis erros na estratégia de vacinação. A partir da análise Coalescente da população viral de Febre Amarela, a população viral apresentou um decréscimo importante iniciado em meados dos anos 90. A análise filogeográfica sugere um padrão geral de transmissibilidade Source-Sink destacando a região amazônica como fonte de diversidade para as outras áreas estudadas, com uma estrutura filogeográfica secundária em ondas. Assim, as introduções do vírus em áreas fora da amazônia tem ocorrência aleatória e podem ser ligadas temporalmente e geograficamente ao norte da America do Sul. Os modelos de distribuição geográfica corroboram esse padrão e indicam uma área possível para circulação da Febre Amarela ampla, englobando diversos ecótonos. Os resultados indicam um possível efeito em longo prazo da vacinação atuando diretamente sobre a evolução e dinâmica filogenética da Febre Amarela e sugere que monitorar a evolução do vírus da Febre Amarela é uma estratégia válida para compreender sua distribuição geográfica e evidenciar mecanismos complexos de transmissão e introdução. Por sua vez, os modelos de Nicho Ecológico mostraram ser ferramentas adequadas para calcular o risco da doença em determinadas áreas, sem sua ocorrência prévia, contribuindo como um modelo preditivos para orgãos de Vigilância prepararem suas estratégias de prevenção e controle no caso de possível introdução de patógenosThe flaviviruses are viruses of 40-50 nm in diameter, with spherical shaped and single-strand RNA with positive sense and approximately 11 kb in length. The Yellow Fever virus is the prototype of the group and the causative agent of Yellow Fever, a disease which caused widespread epidemics in Africa, North America, South America and Europe of the seventeenth century to the early twentieth century. The disease reemerged in recent decades in sub-Saharan Africa and tropical South America. This manuscript aims to reconstruct, in time and space, the transmission of yellow fever in South America, through the applying of a Bayesian inference model, considering the probable influence of human populations, nonhuman primates and mosquitoes on the evolution and distribution of Yellow Fever genetic lineages. Distributional pattern hypothesis will be tested by computational modeling of ecological niche. The data provide little evidence that current vaccination strategies have effectively contributed to reducing the occurrence of Yellow Fever, indicating possible errors in the vaccination strategy. From the analysis of the Yellow Fever population Coalescence, the viral population showed a significant decrease started in the mid-90s. The phylogeographic analysis suggests a general pattern of transmissibility \"Source-Sink\" highlighting the Amazon region as a source of diversity for the other areas studied, with a secondary phylogeographic wave like structure. Thus, the introductions of the virus into areas outside the Amazon has random occurrence and can be linked temporally and geographically to the north of South America The geographical distribution models corroborate this pattern and indicate a broad possible area for Yellow Fever circulation, encompassing many ecotones. The results indicate a possible long-term effect of vaccination acting directly on the evolution and phylogenetic dynamics of Yellow Fever and suggests that monitoring the evolution of the Yellow Fever virus is a valid strategy to understand the geographical distribution and highlight complex transmission mechanisms and spatial movements. In turn Ecological Niche models showed as an appropriate tool to calculate disease risk in certain areas without previous occurrence of the disease, working as a predictive model for Surveillance institutions prepare their strategies for prevention and control in the case of possible pathogen introduction
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Inoue, Kentaro. "A Comprehensive Approach to Conservation Biology: From Population Genetics to Extinction Risk Assessment for Two Species of Freshwater Mussels." Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1437683696.
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Lucas, D. Pulane. "Disruptive Transformations in Health Care: Technological Innovation and the Acute Care General Hospital." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/2996.
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Advances in medical technology have altered the need for certain types of surgery to be performed in traditional inpatient hospital settings. Less invasive surgical procedures allow a growing number of medical treatments to take place on an outpatient basis. Hospitals face growing competition from ambulatory surgery centers (ASCs). The competitive threats posed by ASCs are important, given that inpatient surgery has been the cornerstone of hospital services for over a century. Additional research is needed to understand how surgical volume shifts between and within acute care general hospitals (ACGHs) and ASCs. This study investigates how medical technology within the hospital industry is changing medical services delivery. The main purposes of this study are to (1) test Clayton M. Christensen’s theory of disruptive innovation in health care, and (2) examine the effects of disruptive innovation on appendectomy, cholecystectomy, and bariatric surgery (ACBS) utilization. Disruptive innovation theory contends that advanced technology combined with innovative business models—located outside of traditional product markets or delivery systems—will produce simplified, quality products and services at lower costs with broader accessibility. Consequently, new markets will emerge, and conventional industry leaders will experience a loss of market share to “non-traditional” new entrants into the marketplace. The underlying assumption of this work is that ASCs (innovative business models) have adopted laparoscopy (innovative technology) and their unification has initiated disruptive innovation within the hospital industry. The disruptive effects have spawned shifts in surgical volumes from open to laparoscopic procedures, from inpatient to ambulatory settings, and from hospitals to ASCs. The research hypothesizes that: (1) there will be larger increases in the percentage of laparoscopic ACBS performed than open ACBS procedures; (2) ambulatory ACBS will experience larger percent increases than inpatient ACBS procedures; and (3) ASCs will experience larger percent increases than ACGHs. The study tracks the utilization of open, laparoscopic, inpatient and ambulatory ACBS. The research questions that guide the inquiry are: 1. How has ACBS utilization changed over this time? 2. Do ACGHs and ASCs differ in the utilization of ACBS? 3. How do states differ in the utilization of ACBS? 4. Do study findings support disruptive innovation theory in the hospital industry? The quantitative study employs a panel design using hospital discharge data from 2004 and 2009. The unit of analysis is the facility. The sampling frame is comprised of ACGHs and ASCs in Florida and Wisconsin. The study employs exploratory and confirmatory data analysis. This work finds that disruptive innovation theory is an effective model for assessing the hospital industry. The model provides a useful framework for analyzing the interplay between ACGHs and ASCs. While study findings did not support the stated hypotheses, the impact of government interventions into the competitive marketplace supports the claims of disruptive innovation theory. Regulations that intervened in the hospital industry facilitated interactions between ASCs and ACGHs, reducing the number of ASCs performing ACBS and altering the trajectory of ACBS volume by shifting surgeries from ASCs to ACGHs.
Books on the topic "Ecological Niche Factor Analysis"
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Worm, Boris, and Derek P. Tittensor. A Theory of Global Biodiversity (MPB-60). Princeton University Press, 2018. http://dx.doi.org/10.23943/princeton/9780691154831.001.0001.
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The number of species found at a given point on the planet varies by orders of magnitude, yet large-scale gradients in biodiversity appear to follow some very general patterns. Little mechanistic theory has been formulated to explain the emergence of observed gradients of biodiversity both on land and in the oceans. Based on a comprehensive empirical synthesis of global patterns of species diversity and their drivers, this book develops and applies a new theory that can predict such patterns from few underlying processes. The book shows that global patterns of biodiversity fall into four consistent categories, according to where species live: on land or in coastal, pelagic, and deep ocean habitats. The fact that most species groups, from bacteria to whales, appear to follow similar biogeographic patterns of richness within these habitats points toward some underlying structuring principles. Based on empirical analyses of environmental correlates across these habitats, the book combines aspects of neutral, metabolic, and niche theory into one unifying framework. Applying it to model terrestrial and marine realms, the book demonstrates that a relatively simple theory that incorporates temperature and community size as driving variables is able to explain divergent patterns of species richness at a global scale. Integrating ecological and evolutionary perspectives, the book yields surprising insights into the fundamental mechanisms that shape the distribution of life on our planet.
Book chapters on the topic "Ecological Niche Factor Analysis"
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Zhao, Zhi-xuan, Jun Yin, Zhan-feng Huang, Bai-sha Weng, Biao Zhang, and Deng-hua Yan. "Nest Habitat Suitability Modeling for Red-Crown Crane (Grus Japonensis) Based on Ecological Niche Factor Analysis." In Advances in Intelligent and Soft Computing, 555–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25188-7_69.
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Lijuan, Gu, and Wang Min. "The Analysis of the SMEs Survival Strategy Based on the Ecological Niche Theory." In Advances in Intelligent and Soft Computing, 417–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27948-5_55.
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Fortunato, Léa, Chantal Guihenneuc-Jouyaux, Dominique Laurier, Margot Tirmarche, Jacqueline Clavel, and Denis Hémon. "Introduction of Within-area Risk Factor Distribution in Ecological Poisson Models." In Mathematical Methods in Survival Analysis, Reliability and Quality of Life, 61–74. London, UK: ISTE, 2010. http://dx.doi.org/10.1002/9780470610985.ch4.
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Peterson, A. Townsend, Jorge Soberón, Richard G. Pearson, Robert P. Anderson, Enrique Martínez-Meyer, Miguel Nakamura, and Miguel Bastos Araújo. "Modeling Ecological Niches." In Ecological Niches and Geographic Distributions (MPB-49). Princeton University Press, 2011. http://dx.doi.org/10.23943/princeton/9780691136868.003.0007.
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This chapter explains how environmental data can be used to create models that characterize species’ ecological niches in environmental space. It introduces a model, which is a function constructed by means of data analysis for the purpose of approximating the true relationship (that is, the niche) in the form of the function f linking the environment and species occurrences. The chapter first considers the “meaning” of the function f that is being estimated by the algorithms before discussing the modeling algorithms, the approaches used to implement ecological niche modeling, model calibration, model complexity and overfitting, and model extrapolation and transferability. The chapter concludes with an overview of differences among methods and selection of “best” models, along with strategies for characterizing ecological niches in ways that allow visualization, comparisons, definition of quantitative measures, snf more.
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Bonan, Gordon B. "Soil temperature as an ecological factor in boreal forests." In A Systems Analysis of the Global Boreal Forest, 126–43. Cambridge University Press, 1992. http://dx.doi.org/10.1017/cbo9780511565489.005.
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Henderson, Peter A. "The Construction, Description, and Analysis of Age-Specific Life-Tables." In Southwood's Ecological Methods, 336–61. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198862277.003.0011.
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Methods for constructing a life-table and budget for a species are described, and the various methods for the analysis of stage-frequency data reviewed. Stage-frequency data comprise counts of the individuals in different development stages in samples taken from a population over a period of time. The analysis of stage-frequency data to estimate the durations of the stages, the numbers entering stages, and survival rates is described. Examples of survivorship curves are presented, and the calculation of population growth rate described. Analysis of life-table data and demographic methods, including key-factor analysis, are described.
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Cliff, A. D., M. R. Smallman-Raynor, P. Haggett, D. F. Stroup, and S. B. Thacker. "Environmental Changes: Ecological Modifications." In Infectious Diseases: A Geographical Analysis. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780199244737.003.0017.
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Diseases originate, spread, and persist or wither, within a specific environmental context. For the entire time during which humans have lived on the earth, this environmental context has changed and, viewed from the beginning of a new millennium, all the available evidence suggests that the environment is set to change further and faster than at any other time in human history. In this chapter, we explore aspects of the changing environmental terrain in which diseases spread, and how these changes have served to promote the emergence and resurgence of infectious agents. Anthropogenic environmental changes and ecological modifications that promote the emergence and resurgence of infectious diseases are numerous and include deforestation and reforestation, road construction, agricultural development, dam building, irrigation and water control schemes, coastal zone degradation and wetland modification, mining and urbanization, and macro- and micro-climate change and variability (Morse 1995; Patz, Graczyk, et al. 2000; Patz, Daszak, et al. 2004; McMichael 2004). As Patz, Daszak, et al. (2004: 1092) observe, these changes and modifications can, in turn, provoke a ‘cascade effect’ of habitat fragmentation, ecosystem degradation, and biodiversity loss, pollution, poverty, and human migration that serve to amplify the risks of disease emergence and spread. Examples of infectious diseases that are known or suspected to be especially prone to the effects of environmental and land use change are given in Table 7.1. Of the many environmental and land use changes that can facilitate the processes of infectious disease emergence and resurgence, we have selected the five interlinked factors in Figure 7.1 for study here. We illustrate each factor with special reference to one or more examples drawn from the sample diseases and regions listed in Table 7.2. Our examples include: agricultural development and Argentine haemorrhagic fever in South America (Section 7.2); water control schemes and Rift Valley fever in Africa and the eastern Mediterranean (Section 7.3); deforestation and Nipah viral disease in the western Pacific (Section 7.4.1); reforestation and Lyme disease in North America (Section 7.4.2); climate variability and hantavirus pulmonary syndrome in North America (Section 7.5); and natural disasters and disease in North America and South-East Asia (Section 7.6).
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Peterson, A. Townsend, Jorge Soberón, Richard G. Pearson, Robert P. Anderson, Enrique Martínez-Meyer, Miguel Nakamura, and Miguel Bastos Araújo. "From Niches to Distributions." In Ecological Niches and Geographic Distributions (MPB-49). Princeton University Press, 2011. http://dx.doi.org/10.23943/princeton/9780691136868.003.0008.
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This chapter explores the conceptual bases for the discrepancy between species’ potential geographic distributional areas and their occupied distributional areas, focusing on the case of conditions when the Eltonian Noise Hypothesis is true as well as the necessary modifications when it is not. It first considers the meaning of the potential distributional area and the reasons why an ecological niche model may not estimate it correctly. It then explains why a species may not be at equilibrium with its potential distributional area, but rather inhabits only some subset of areas suitable for it. It also discusses nonequilibrium distributions that may arise in terms of the BAM diagram before concluding with an analysis of procedures for further processing of a niche model, which expresses potential geographic distributional area, to yield an estimate of occupied distributional area.
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Wilkening, Jennifer, Lara Kobelt, and Tiffany J. Pereira. "Climate Change Vulnerability Assessment of Imperiled Plants in the Mojave Desert." In Endangered Plants. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95783.
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The Mojave Desert in the southwestern United States is one of the hottest and driest areas of North America. Climate change is likely to exacerbate these conditions. The region is home to many endemic plant species, including 24 federally threatened species. The impact of climate change factors on these sensitive Mojave Desert species is relatively unknown. Here we used a climate change vulnerability assessment to determine which imperiled plants may be most affected by changing climatic conditions. We evaluated the vulnerability of each species under future climate scenarios and calculated scores using metrics such as exposure, sensitivity, niche breadth, and dispersal capability. We found that most listed plant species were vulnerable to climate change, with 21% (N = 5) classified as extremely vulnerable, 25% (N = 6) classified as highly vulnerable, and 42% (N = 10) classified as moderately vulnerable. Contributing factors most frequently associated with vulnerability included various barriers to migration, high habitat specificity, and species sensitivity to changes in hydrological patterns. Many of these species are already threatened by ongoing anthropogenic stressors such as urban growth and associated developments, and these results suggest that climate change will pose additional challenges for conservation and management. Natural resource managers can use the vulnerability ranking and contributing factors identified from these analyses to inform ecological decisions related to threatened plants throughout desert regions.
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"Fishery Resources, Environment, and Conservation in the Mississippi and Yangtze (Changjiang) River Basins." In Fishery Resources, Environment, and Conservation in the Mississippi and Yangtze (Changjiang) River Basins, edited by Xiaoyun Sui, Xiao Zhang, Yintao Jia, Yifeng Chen, and Dekui He. American Fisheries Society, 2016. http://dx.doi.org/10.47886/9781934874448.ch8.
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<em>Abstract</em>.—A total of 13 alien fish species were introduced to the middle reaches of the Yarlung Zangbo River with the development of aquaculture in recent years. Eight of these species now have established populations and five have not established. To explore the mechanism for alien fish species establishment in this river, we compiled 23 biological traits of those species and tested for differences in biological trait and ecological niche between the established and nonestablished fish species. The trait analysis results showed that successfully established fish species have smaller body length, smaller egg diameter, earlier sexual maturity, and wider diet breadth than the nonestablished species. Ecological niches between established and nonestablished fish species also differed significantly. Our results support the vacant niche hypothesis that the successfully established species could occupy the vacant niches in the introduced range. We also used a model to predict the invasion risk of 27 potentially introduced fish species in the middle reaches of the Yarlung Zangbo River. The model predicted that there was a higher risk of establishment for 15 of the 27 species.
Conference papers on the topic "Ecological Niche Factor Analysis"
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Xingjian, Xue, and He QiChao. "Urban Public Transportation Ecological Niche Marginal Distance Base on Passenger Trip Cost Analysis." In 2009 Second International Conference on Intelligent Computation Technology and Automation. IEEE, 2009. http://dx.doi.org/10.1109/icicta.2009.676.
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Ni, Qiang, Hong-li Wang, Huai-yu Li, Zhao-mei Liu, and Jian-feng Feng. "Coastal zone urban ecological economy evaluation based on SFA and factor analysis." In EM2010). IEEE, 2010. http://dx.doi.org/10.1109/icieem.2010.5646614.
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Banaszek, Jarosław, Marzena Leksy, and Oimahmad Rahmonov. "The ecological diversity of vegetation within urban parks in the Dąbrowski Basin (southern Poland)." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.005.
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The aim of this work is to present the diversity of flora in terms of ecological requirements. The research was conducted in the area of two urban parks in the area of two cities in southern Poland: Bedzin and Czeladz. These parks were established in different historical periods, and were planned (and are managed) differently. The results of the investigation have shown that the occurrence of 192 vascular species has been observed in the Gora Zamkowa (Castle Hill) Park, while in the Grabek park, 334 such species are known to exist. Such disparity is the result of the occurrence of micro-habitats and of the differences between the ways the two parks are managed. It is also due to these parks’ different functions. In the first case, the park area is protected by law. In the latter case, human activity has created a new ecological niche for organisms with a high degree of ecological tolerance. Based on the ecological values, the following groups of plants were distinguished: saxi-frages grasslands, xerothermic grasslands, beech forests, alder forests and artificial planted trees. Analysis has shown that ur-ban parks are potential places for growth various type of vegetation and also for increasing biodiversity, and can constitute particularly important hotspots for biodiversity in the cityscape, even if their primary role is recreational. As the study shows, the environment of a highly urbanized and industrialized region can also have a positive influence on ecological and floristic diversity.
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Lu, Qing, Liyan Xu, Zhen Cai, and Xiao Peng. "The spectrum of metropolitan areas across the world, and detection of potential metropolitan areas with Chinese characteristics." In 55th ISOCARP World Planning Congress, Beyond Metropolis, Jakarta-Bogor, Indonesia. ISOCARP, 2019. http://dx.doi.org/10.47472/sdgu8646.
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When people talk about the Metropolitan Area (MA), they mean differently in different parts of the world with different contexts. Based on its spatial extent, internal structure, socio-economic function, and network characteristics, an MA can refer to various entities from a metropolis to a Megacity-region. In an effort to clarify the MA concept, we review the origin of the MA concept and its development in various parts of the world, especially the United States, Japan and China, so as to propose a spectrum of MAs, and their relationship with specific human and natural geographical contexts. Particularly, we find MAs in China typically have a unique three-circle structure, which is composed of a core circle, a commuting circle, and a functional metropolitan circle. By international comparable standards which include factors such as population density, facility density, and economic activity intensity, and adjusted with reasonable context-dependent considerations in China, the three circles are designated as follows: the spatial extent with the highest development intensity and assuming a central regional role is identified as the core circle; the districts and counties around the core circle with a commuting rate greater than 10% are identified as the commuting circle; and the districts and counties within an one-hour accessible zone are identified as the functional metropolitan circle. To test the model, we utilize eight sources of big data covering ecological background, population, economy, transportation, real estate, land use, infrastructure, and culture characteristics, and with a fusion analysis of the data we show how the factors combined give rise to the three-circle structure in typical Chinese MAs, and why the combination of the same factors in the US and Japanese contexts works otherwise to fill different niches in the spectrum of MAs mentioned above. For a further inquiry, within the framework of the same model and using the same dataset, we identify 32 cities from all 338 prefecture-level cities in China that would qualify as an MA or potential MA, which we call “the Metropolitan Areas with Chinese Characteristics”, and designate the spatial extent of the three circles within each of the MAs. Additional analyses are also conducted to locate the main development corridors, key growth poles, and currently underdeveloped regions in each of the MAs. We conclude the paper with discussions of potential challenges of MA development in China vis-a-vis current policies, such as cross-administration collaboration between jurisdictions within the same MA, and cross-scale collaboration between MAs, cities, and city groups. Placing the research in the global context, and considering the vast similarities between China and other developing countries in terms of population density, land resources, urbanization level, and socio-economic development status in general, we argue that China’s model of MAs may be also applicable to other developing countries. Therefore, this research may shed lights to planning researchers and practitioners around the world, especially in developing countries in understanding the development conditions of MAs in their own contexts, and also in methods for identifying and planning potential MAs to achieve their specific policy objectives.
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Abdel Samad, Rim, Zulfa Al Disi, Mohammad Ashfaq, and Nabil Zouari. "The use of Principle Component Analysis and MALDI-TOF MS for the differentiation of mineral forming Virgibacillus and Bacillus species isolated from Sabkhas." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0069.
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Occurrence of mineral forming and other bacteria in mats is well demonstrated. However, their high diversity shown by ribotyping was not explained, although it could explain the diversity of formed minerals. Common biomarkers as well as phylogenic relationships are useful tools to clustering the isolates and predict their potential role in the natural niche. In this study, combination of MALDI-TOF MS with PCA was shown a powerful tool to categorize 35 mineral forming bacterial strains isolated from Dohat Fshaikh sabkha, at northwest of Qatar (23 from decaying mats and 12 from living ones). 23 strains from decaying mats belong to Virgibacillus genus as identified by ribotyping and are shown highly involved in formation of protodolomite and a diversity of minerals. They were used as internal references in categorization of sabkha bacteria. Combination of isolation of bacteria on selective mineral forming media, their MALDI TOF MS protein profiling and PCA analysis established their relationship in a phyloproteomic based on protein biomarkers including m/z 4905, 3265, 5240, 6430, 7765, and 9815. PCA analysis clustered the studied strains into 3 major clusters, showing strong correspondence to the 3 phyloproteiomic groups that were established by the dendrogram. Both clustering analysis means have evidently demonstrated a relationship between known Virgibacillus strains and other related bacteria based on profiling of their synthesized proteins. Thus, larger populations of bacteria in mats can be easily screened for their potential to exhibit certain activities, which is of ecological, environmental and biotechnological significance.
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Felcis, Renars, and Janis Zaltkovskis. "Ecological Attitudes and Their Components about Organic and Conventionally Grown Food: The Case of the Gauja National Park." In 14th International Scientific Conference "Rural Environment. Education. Personality. (REEP)". Latvia University of Life Sciences and Technologies. Faculty of Engineering. Institute of Education and Home Economics, 2021. http://dx.doi.org/10.22616/reep.2021.14.037.
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The 2nd year students of sociology in Faculty of Social Sciences in University of Latvia conducted a study “Attitudes of the residents of the Gauja National Park region towards organic and conventional agriculture” during the spring of 2020, under the supervision of lecturers Renārs Felcis and Jurijs Ņikišins, where ecological attitude index has been made on organic and conventional farming (including 4 statements regarding statements of state action). The aim of the article is to describe the index of ecological attitudes and to identify the latent themes of ecological attitudes about organic and conventional farming to reveal in more detailed hidden similarities of 10 statements about aspects of organic and conventional farming. A type of factor analysis (principal component analysis (further ‒ PCA)) was performed in addition to the descriptive analysis to achieve the aim. In the final analysis, 3 components were proposed, the first of which reflects the ecological habits of purchase, the second ‒ the ecological habits of growing and the third ‒ the individual variables on the importance of the expiration of products. The applicability of the statement scale in future research is suggested for discussion and conclusions.
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Shaowei, Wang. "Radiation Dose Evaluation of Marine Organisms for Coastal Nuclear Power Plant." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67832.
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Fukushima nuclear accident has aroused concern about ionizing radiation damage to the marine environment. It is subjective to assess the accident’s effects on the marine ecological environment during different scholars, because of different understanding of nuclide release quantity, dose estimation models and parameters. To solve this problem, a gradually progressive research approach is designed based on a coastal nuclear power plant in study, which is “from influencing factors analyzing to biological dose assessment, and to uncertainty analysis”. First, the factors affecting the biological dose assessment will be analyzed, and then the concerns of the various factors and their impact on the results of the assessment will be discussed. Second, the biological dose will be assessed based on appropriate dose mode after selecting representative species and analyzing critical exposure pathway. Finally, the uncertainty of radionuclide release quantity, dilution factor, concentration factor, dose conversion factor will be analyzed. The study will provide reliable scientific bases to identify the factors impact biological dose assessment effectively, and improve the accuracy of the dose evaluation.
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Volkova, Tatiana, Tatiana Volkova, Vera Minenkova, Vera Minenkova, Denis Dony, Denis Dony, Anatoly Filobok, Anatoly Filobok, Diana Pinchuk, and Diana Pinchuk. "FACTORS INFLUENCING THE FORMATION AND REALIZATION OF THE TRANSBOUNDARY NATURAL MANAGEMENT POLICY IN AZOV-BLACK SEA BASIN." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b43157a814f.
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The states of the Azov-Black sea basin make an active usage of different transboundary resources, first of all, natural, spatial and anthropogenic for personal use that mostly come into collision with the global purposes of the steady region development. Rather unsteady environment is being formed in the given region when the interference of the inner and outer negative factors of social, economic, anthropogenic political and ecological development occurs. All that leads to the formation of the complex problems demanding urgent solution. For the benefit of the production of recommendations for the effective realization of the state policy of transboundary natural management and finding out strong and weak points, opportunities and threats the SWOT analysis of the factors influencing the realization of the transboundary natural management policy in the Azov –Black sea basin has been performed. Currently the determining role in the formation and realization of transboundary natural management policy is being played by the political factors including geopolitical unsteadiness, absence of agreement in decisions taking and unpredictability of the tendency of international sanctions establishment. In this case on the one hand environmental policy is a “victim” of the political ambitions of the states of the region, on the other hand – it is able to act as consolidating factor for the countries realizing the necessity of solving the problem of the steady natural management facing the common ecologic threats.
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Volkova, Tatiana, Tatiana Volkova, Vera Minenkova, Vera Minenkova, Denis Dony, Denis Dony, Anatoly Filobok, Anatoly Filobok, Diana Pinchuk, and Diana Pinchuk. "FACTORS INFLUENCING THE FORMATION AND REALIZATION OF THE TRANSBOUNDARY NATURAL MANAGEMENT POLICY IN AZOV-BLACK SEA BASIN." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b9427677c65.26790752.
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The states of the Azov-Black sea basin make an active usage of different transboundary resources, first of all, natural, spatial and anthropogenic for personal use that mostly come into collision with the global purposes of the steady region development. Rather unsteady environment is being formed in the given region when the interference of the inner and outer negative factors of social, economic, anthropogenic political and ecological development occurs. All that leads to the formation of the complex problems demanding urgent solution. For the benefit of the production of recommendations for the effective realization of the state policy of transboundary natural management and finding out strong and weak points, opportunities and threats the SWOT analysis of the factors influencing the realization of the transboundary natural management policy in the Azov –Black sea basin has been performed. Currently the determining role in the formation and realization of transboundary natural management policy is being played by the political factors including geopolitical unsteadiness, absence of agreement in decisions taking and unpredictability of the tendency of international sanctions establishment. In this case on the one hand environmental policy is a “victim” of the political ambitions of the states of the region, on the other hand – it is able to act as consolidating factor for the countries realizing the necessity of solving the problem of the steady natural management facing the common ecologic threats.
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Wu, Ye, Tingting Yu, and Hong Leng. "Integrating the landscape vulnerability into developing rural places: a framework for rural landscape vulnerability evaluation from human-natural perspective." In Post-Oil City Planning for Urban Green Deals Virtual Congress. ISOCARP, 2020. http://dx.doi.org/10.47472/tanf6339.
Full textAbstract:
According to the formation of urban-rural structure in the process of global urbanization, rural area plays an important role in supporting the healthy, liveable environment in cities and villages. With the dual pressure of ecological environment change and rapid urbanization, the rural landscape has obvious problems, resulting in the degradation or even disappearance of rural landscape, and assimilation of rural civilization. In order to identify the rural landscape problems and reveal its formation mechanism, this paper proposes a specific framework to analyze the vulnerability indicators of rural landscape, to reflect the vulnerability of rural human-natural systems and explore the driving factors, and to propose corresponding planning strategies to cope with the vulnerability and shaping liveable places. The study focuses on the typical villages in representative county, located in Heilongjiang, China. Based on the vulnerability components of exposure, sensitivity and adaptation, we construct the evaluation index of rural landscape vulnerability, and use the comprehensive index method to calculate the vulnerability threshold of 12 typical villages, exploring the driving factors combining Factor Analysis and Principal Component Analysis. Further, the framework will propose a way to communicate with practitioners and policy makers on reducing or coping with landscape vulnerability. It can thus serve as a tool for targeting the implementation of policies and practices aimed at improving the liveable rural settlements environment in villages.