Relevant bibliographies by topics / Population Viability Assessment

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Population Viability Assessment'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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Journal articles on the topic "Population Viability Assessment"

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Lee, Danny C., and Bruce E. Rieman. "Population Viability Assessment of Salmonids by Using Probabilistic Networks." North American Journal of Fisheries Management 17, no. 4 (November 1997): 1144–57. http://dx.doi.org/10.1577/1548-8675(1997)017<1144:pvaosb>2.3.co;2.

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Andersen, Mark C. "Potential Applications of Population Viability Analysis to Risk Assessment for Invasive Species." Human and Ecological Risk Assessment: An International Journal 11, no. 6 (December 2005): 1083–95. http://dx.doi.org/10.1080/10807030500278610.

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Mazaris, Antonios D., Øyvind Fiksen, and Yiannis G. Matsinos. "Using an individual-based model for assessment of sea turtle population viability." Population Ecology 47, no. 3 (August 5, 2005): 179–91. http://dx.doi.org/10.1007/s10144-005-0220-5.

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McCallum, Hamish. "Risk assessment in conservation biology." Pacific Conservation Biology 1, no. 4 (1994): 372. http://dx.doi.org/10.1071/pc940372.

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Population viability analysis (PVA) has become one of the standard tools of conservation biology. Unfortunately, few examples have entered the refereed literature. Most remain in the "grey" world of internal government reports, where the results of "what-if" scenarios become transformed into the firm basis for policy settings. The problem is that rough guesses of population parameters enter the black box of a modeling package, to emerge as attractive and apparently precise graphs of extinction probability as a function of population size. Somewhere in the process, it is often forgotten that the quantitative predictions cannot be better than the quality of the parameters which went into them.
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Mirzayans, Razmik, Bonnie Andrais, and David Murray. "Viability Assessment Following Anticancer Treatment Requires Single-Cell Visualization." Cancers 10, no. 8 (August 1, 2018): 255. http://dx.doi.org/10.3390/cancers10080255.

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A subset of cells within solid tumors become highly enlarged and enter a state of dormancy (sustained proliferation arrest) in response to anticancer treatment. Although dormant cancer cells might be scored as “dead” in conventional preclinical assays, they remain viable, secrete growth-promoting factors, and can give rise to progeny with stem cell-like properties. Furthermore, cancer cells exhibiting features of apoptosis (e.g., caspase-3 activation) following genotoxic stress can undergo a reversal process called anastasis and survive. Consistent with these observations, single-cell analysis of adherent cultures (solid tumor-derived cell lines with differing p53 status) has demonstrated that virtually all cells—irrespective of their size and morphology—that remain adherent to the culture dish for a long time (weeks) after treatment with anticancer agents exhibit the ability to metabolize 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl- tetrazolium bromide (MTT). The purpose of this commentary is to briefly review these findings and discuss the significance of single-cell (versus population averaged) observation methods for assessment of cancer cell viability and metabolic activity.
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Trisurat, Yongyut, Anak Pattanavibool, George A. Gale, and David H. Reed. "Improving the viability of large-mammal populations by using habitat and landscape models to focus conservation planning." Wildlife Research 37, no. 5 (2010): 401. http://dx.doi.org/10.1071/wr09110.

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Context. Assessing the viability of animal populations in the wild is difficult or impossible, primarily because of limited data. However, there is an urgent need to develop methods for estimating population sizes and improving the viability of target species. Aims. To define suitable habitat for sambar (Cervus unicolor), banteng (Bos javanicus), gaur (Bos gaurus), Asian elephant (Elephas maximus) and tiger (Panthera tigris) in the Western Forest Complex, Thailand, and to assess their current status as well as estimate how the landscape needs to be managed to maintain viable populations. Methods. The present paper demonstrates a method for combining a rapid ecological assessment, landscape indices, GIS-based wildlife-habitat models, and knowledge of minimum viable population sizes to guide landscape-management decisions and improve conservation outcomes through habitat restoration. Key results. The current viabilities for gaur and elephant are fair, whereas they are poor for tiger and banteng. However, landscape quality outside the current distributions was relatively intact for all species, ranging from moderate to high levels of connectivity. In addition, the population viability for sambar is very good under the current and desired conditions. Conclusions. If managers in this complex wish to upgrade the viabilities of gaur, elephant, tiger and banteng within the next 10 years, park rangers and stakeholders should aim to increase the amount of usable habitat by ~2170 km2 or 17% of existing suitable habitats. The key strategies are to reduce human pressures, enhance ungulate habitats and increase connectivity of suitable habitats outside the current distributions. Implications. The present paper provides a particularly useful method for managers and forest-policy planners for assessing and managing habitat suitability for target wildlife and their population viability in protected-area networks where knowledge of the demographic attributes (e.g. birth and death rates) of wildlife populations are too limited to perform population viability analysis.
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Shrader‐Frechette, Kristin. "Comparativist Philosophy of Science and Population Viability Assessment in Biology: Helping Resolve Scientific Controversy." Philosophy of Science 73, no. 5 (December 2006): 817–28. http://dx.doi.org/10.1086/518634.

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Rezaeinejad, Saeid, and Volodymyr Ivanov. "Assessment of correlation between physiological states of Escherichia coli cells and their susceptibility to chlorine using flow cytometry." Water Supply 13, no. 4 (August 1, 2013): 1056–62. http://dx.doi.org/10.2166/ws.2013.083.

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The physiological differences of individual cells of bacterial population may imply the existence of cell subpopulations with different sensitivity to chlorine, which may affect the efficiency of drinking water disinfection. The susceptibility of individual bacterial cells to chlorine was examined using flow cytometry. The inactivation of Escherichia coli cells by chlorine in the populations with specific growth rates of 0.2 and 0.9 h−1 was assessed using various viability indicators. Viability of bacterial cells was evaluated using membrane integrity propidium iodide (PI) dye, respiratory activity indicator of 5-cyano-2,3-ditolyl tetrazolium chloride (CTC) and membrane potential probe of DiBAC4(3). It was found that there were cell subpopulations of E. coli with different levels of susceptibility to chlorine. E. coli cell population with higher specific growth rate was more susceptible to chlorine. The CT values for inactivation of 99% of cells (CT99) in populations of E. coli with specific growth rates of 0.9 and 0.2 h−1 were 0.06 and 0.09 mg min l−1, respectively. Flow cytometry could be used to study the sensitivity of bacterial cells to the chemical agents.
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King, Tony, Christelle Chamberlan, and Amos Courage. "Assessing reintroduction success in long-lived primates through population viability analysis: western lowland gorillas Gorilla gorilla gorilla in Central Africa." Oryx 48, no. 2 (October 21, 2013): 294–303. http://dx.doi.org/10.1017/s0030605312001391.

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AbstractThe use of population modelling has become an increasingly common tool in reintroduction planning and assessment. Although initial reintroduction success is often measured by quantifying post-release survival and reproduction, longer-term success is best assessed through measurements of population viability. Here we develop a population model capable of providing useful results for influencing management of a reintroduction programme for a long-lived and slow-reproducing primate, the western lowland gorilla Gorilla gorilla gorilla. We used post-release monitoring data from two reintroduced populations in the Batéké Plateau region of Congo and Gabon, complemented with published data on wild and captive populations, to develop a population model using Vortex. Sensitivity testing illustrated that the model was highly sensitive to changes in the input parameters for annual birth rates, the number of lethal equivalents, and for female annual mortality rates, especially for adults. The results of the population viability analysis suggested that the reintroduced gorilla populations have a reasonable chance of persistence (> 90% over 200 years) but illustrated that reinforcement of the populations could significantly improve probabilities of population persistence and retention of genetic diversity. Equally, catastrophic events could have significant negative impacts. Continued monitoring of the populations should allow refinement of the model, improving confidence in its predictions and its relevance to decision-making.
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Murray, Dennis L., Karen F. Hussey, Laura A. Finnegan, Stacey J. Lowe, Glynis N. Price, John Benson, Karen M. Loveless, et al. "Assessment of the status and viability of a population of moose (Alces alces) at its southern range limit in Ontario." Canadian Journal of Zoology 90, no. 3 (March 2012): 422–34. http://dx.doi.org/10.1139/z2012-002.

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Factors affecting the distribution and abundance of animals are of substantial interest, and across most of their southern range, populations of moose ( Alces alces (L., 1758)) are declining, presumably because of climate change. Conditions favouring moose population decline versus numerical increase in select areas of the range are not well understood. During 2006–2009, we tested the hypothesis that moose in southern Ontario formed a viable population near the species’ southern range limit, despite occurrence of climate patterns apparently deleterious for population growth. Our study upheld each of our predictions: (i) high pregnancy rate (83.0%) and annual female survival rate (0.899 (0.859, 0.941; 95% CI)), indicating that the population was increasing (λ = 1.16); (ii) female moose having blood-based condition indices within normal range, despite larger than expected home-range size; and (iii) levels of genetic differentiation indicating that the population was part of a larger metapopulation of moose in the region. We surmise that moose in southern Ontario currently are not subject to the prevalent continental decline, likely owing to favourable site-specific climatic conditions. Future research should elaborate on why select southern moose populations are increasing and whether they will ultimately succumb to die off as effects of climate change become increasingly pronounced.
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Dissertations / Theses on the topic "Population Viability Assessment"

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Bowerman, Tracy. "A Multi-Scale Investigation of Factors Limiting Bull Trout Viability." DigitalCommons@USU, 2013. http://digitalcommons.usu.edu/etd/1524.

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Effective conservation strategies for imperiled species require an understanding of processes that influence fitness throughout the organism's life cycle and across the range of habitats needed to complete that cycle. I evaluated factors that affect population viability of bull trout Salvelinus confluentus, a threatened freshwater char species, throughout individual life stages and over the entire life cycle. I assessed the relationship between bull trout egg incubation success and environmental variables. Egg survival was negatively related to the percent of fine sediment in redds and positively related to hydraulic conductivity and the strength of downwelling. Next, I quantified juvenile bull trout survival rates and described movement patterns for this life stage. Juvenile bull trout emigrated from natal headwaters into larger rivers throughout the entire year and across a range of sizes. Estimates of juvenile survival rates improved dramatically when emigration was incorporated into the analysis. I integrated my observations of bull trout survival, growth, and movement to create a life-cycle model, which I used to better understand how populations respond to changes in specific demographic rates. Bull trout populations were particularly sensitive to changes in juvenile growth and survival. The relative effect of changes to fertility rates and adult survival varied depending upon whether a population was composed primarily of large, migratory, or smaller, resident individuals. Dispersal helped to lower the probability of extinction for small or declining populations when neighboring populations were stable. My research demonstrates that bull trout require access to habitats throughout entire watersheds to maintain population viability. My results suggest that limiting anthropogenic sources of fine sediment and maintaining areas of channel complexity that promote downwelling can be important for bull trout embryo survival. Management decisions should also consider the diverse behavior of juvenile bull trout and the wide range of habitat they use. Additionally, connectivity between populations is likely to be important for declining populations to persist. The diversity of life-history strategies expressed by bull trout helps maintain demographic stability within and among populations. As such, preservation of habitat integrity and full life-history diversity is imperative for conservation and recovery of bull trout populations range-wide.
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Säterberg, Torbjörn. "Minimum Ecologically Viable Populations : Risk assessment from a multispecies perspective." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18959.

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The extinction risk of threatened species has traditionally been assessed by the use of tools of Population Viability Analysis (PVA). Species interactions, however, have seldom been accounted for in PVA:s. The omission of species interactions in risk assessments may further lead to serious mistakes when setting target sizes of populations. Even a slight abundance decrease of a target species may result in changes of the community structure; in the worst case leading to a highly impoverished community. Of critical importance to conservation is therefore the question of how many individuals of a certain population that is needed in order to avoid this kind of consequences. In the current study, a stochastic multispecies model is used to estimate minimum ecological viable populations (MEVP); earlier defined as “the minimum size of a population that can survive before itself or some other species in the community becomes extinct”. The MEVP:s are compared to population sizes given by a single species model where interactions with other species are treated as a constant source incorporated in the species specific growth rate. MEVP:s are found to be larger than the population sizes given by the single species model. The results are trophic level dependent and multispecies approaches are suggested to be of major importance when setting target levels for species at the basal level. Species at higher trophic levels, however, are altogether more prone to extinction than species at the basal level, irrespective of food web size and food web complexity.

 

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Nylen-Nemetchek, Marcy. "Lynx (Felis lynx) of Riding Mountain National Park, an assessment of habitat availability and population viability." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ41666.pdf.

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Muiznieks, Britta Dace. "Population viability analysis of Puerto Rican parrots an assessment of its current status and prognosis for recovery /." Connect to this title online, 2003. http://www.lib.ncsu.edu/theses/available/etd-06192003-121313/unrestricted/etd.pdf.

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Klok, Trijntje Christina. "A quest for the role of habitat quality in nature conservation applications of population dynamical models in viability analysis and risk assessment /." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/55182.

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Rustage, Sarah Elizabeth. "Correlates of rarity in UK bumblebee (Bombus spp.) populations." Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3372.

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The decline of bumblebee (Bombus spp.) populations in the UK and worldwide has been well reported. It has been generally assumed that such declines result in the genetic impoverishment of some species, potentially leading to reduced fitness and increased extinction risk. This study tested the fundamental assumption linking population fragmentation with fitness, in a model system of two Bombus species native to the UK. Bombus monticola has declined significantly in range across the UK in recent years and occupies fragmented upland areas, while Bombus pratorum has remained abundant and widespread over many habitat types. The effects of genetic diversity on fitness have been addressed in wild Bombus species, but this is the first study to explicitly compare data from species of differing levels of population connectivity and hence test the assumptions of traditional population genetic theory. As genetic diversity has often been linked with immunocompetence, aspects of the innate immune response were quantified, together with parasite load. These empirical measures of fitness showed lower than expected variability between the two study species, and no evidence was found to support the theory of lower fitness in fragmented populations. However, the considerable variability between sample sites in both species for all parameters measured raised interesting questions as to the underlying evolutionary processes; it is postulated that B. monticola populations may maintain a higher than expected Ne, despite their fragmented distribution. This study also provided methodological developments. An alternative method for the quantification of wing wear as a proxy for age was proposed, which could be easily applied to other Bombus species and possibly adapted for use in other flying insects. In addition possible sources of error in AFLP analysis were highlighted which have not been adequately discussed in the current literature, namely the effects of sample storage. Given the utility of AFLPs for non-model species, this is an important avenue for future research, and would be applicable to studies in other systems. Overall, the data presented here emphasise the challenges of studying fitness in wild populations, and underline the requirement for research into the fundamental principles underlying many assumptions made by conservation genetic theory.
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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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Kouchner, Coline. "Durabilité des exploitations apicoles et interactions avec les stratégies de renouvellement du cheptel Bee farming systems sustainability: an assessment framework in France." Thesis, Avignon, 2019. http://www.theses.fr/2019AVIG0718.

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Variabilité du contexte de production, pertes de colonies : les exploitations apicoles fontaujourd'hui face à différentes problématiques environnementales et socio-économiques. Enjeu majeur pourla filière, la durabilité des exploitations reste aujourd'hui difficile à caractériser en l’absence de référenceset d’un cadre d’évaluation adapté à l’apiculture. Cette thèse propose une définition de la durabilité adaptéeaux spécificités des exploitations apicoles, élaborée avec un ensemble d’acteurs de la filière apicole enFrance métropolitaine. Cette définition met notamment en lumière l’importance de la capacité d’adaptationdes exploitations, dans un contexte de fortes incertitudes sur les ressources alimentaires du cheptel commesur les pertes de colonies.En l’absence de leviers directs de gestion des ressources, la gestion du cheptel occupe une place centraledans le fonctionnement de l’exploitation. Pour assurer le maintien de ce cheptel malgré les pertes decolonies, différentes stratégies de renouvellement des colonies et des reines sont mises en place par lesapiculteurs. En s’appuyant sur des enquêtes auprès d’apiculteurs professionnels, la deuxième partie de cettethèse caractérise ces différentes stratégies et les pratiques qui les composent, ainsi que leur variabilité d’uneexploitation à l’autre. Ces stratégies de renouvellement contribuent directement à la durabilité del’exploitation par le maintien du cheptel, mais sont aussi en interaction avec d’autres aspects dufonctionnement de l’exploitation, qui sont abordés par la troisième partie de cette thèse. Les choixtechniques de gestion du renouvellement peuvent ainsi générer différentes contraintes dans le temps etl’organisation du travail, et contribuent à l’adaptabilité des pratiques et à la capacité d’adaptation del’exploitation apicole dans un contexte d’incertitudes.Cette thèse contribue à mieux cerner les enjeux actuels de la durabilité des exploitations apicoles, et lesinteractions possibles entre les stratégies de renouvellement du cheptel et cette durabilité
Floral resources availability, annual climatic conditions or colony losses: professionalbeekeepers have to cope with several economic and environmental challenges to ensure the sustainabilityof their farm. Through a collective work with French professional beekeepers and other stakeholders fromthe apicultural sector, this thesis defines the sustainability of bee farming systems. The adaptive capacity ofthe farm appears as a central issue to ensure the beekeeper’s sustainability goals, as beekeepers have toface an uncertain environment.To cope with the annual colony losses, the colony and queen replacement strategy is a key aspect in abee farming operation management, and can interact with other sustainability goals. The replacementstrategies of professional beekeepers are formalised and some of their main technical or socio-economicconsequences are studied. The beekeeper’s replacement strategy appears to affect their work organisation,as well as the flexibility of their practices, which both contribute to the adaptive capacity of the farm.This thesis provides an outlook on the current issues of bee farming system sustainability, and on themain interactions between the beekeeper’s replacement strategy and their farm sustainability
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Fearon, Joclyn Joe. "Population assessments of priority plant species used by local communities in and around three Wild Coast reserves, Eastern Cape, South Africa." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1007059.

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The project was initiated by Eastern Cape Parks (ECP) as a request for the construction of inventories of priority species and their population levels inside three nature reserves on the Eastern Cape Wild Coast, South Africa, and to develop a strategic management plan to manage these natural resources in each reserve. Thirty key species were identified by local communities in and around Dwesa-Cwebe, Silaka and Mkambati Nature Reserves through community workshops. For forested areas belt transects of 100 m x 6 m where used. The basal circumference of key tree species within the belt transect was measured as well as the height of saplings (height < 150 m). Tree species were categorized based on densities, size class distribution (SCD) curves and values, and spatial grain. For grassland areas straight transects of 200 m long were used, along which ten 3 m x 3 m quadrates were placed at 20 m intervals. Within each grassland transect the height of herbs or tuft diameter of grasses was recorded and percentage cover estimated. Grassland species were categorized based on density, SCD curves and percentage cover. All species were placed into harvesting categories based on analysed ecological data that was collected in the field. Category 1 species were very rare or not found in the reserve and it was recommended that species be conserved and monitored. Category 2 species had low densities in the reserve indicating declining populations and was suggested that these be monitored and not harvested. Category 3 species had high densities and have potential for harvesting with strict limitations. Category 4 species were most abundant with very high densities and can be harvested within management guidelines. These categories were grouped further using social and ecological data such as harvesting risk, frequency of collection, use value and number of uses. This highlighted which species have conservation priority within each category and a decision can be made as to how intense or limited extraction should be. By incorporating GIS the distribution of each species was looked at and harvesting and non-harvesting zones established to determine where species can be extracted. Monitoring plans must consider the quantity of plant material collected, fire regimes, optimal harvesting rates and harvesting zones, and be able to pick up changes in populations. Also, it is important that the community be involved in conserving and monitoring these species. Adaptive monitoring and management must be used to steer harvesting practices in the Wild Coast reserves. This allows for the development of harvesting practices through ‘learning by doing’, and the evolution of good questions to guide monitoring decisions
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"Developing Behavioral Indices of Population Viability: A Case Study of California Sea Lions in the Gulf of California, Mexico." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.15085.

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abstract: Despite years of effort, the field of conservation biology still struggles to incorporate theories of animal behavior. I introduce in Chapter I the issues surrounding the disconnect between behavioral ecology and conservation biology, and propose the use of behavioral knowledge in population viability analysis. In Chapter II, I develop a framework that uses three strategies for incorporating behavior into demographic models, outline the costs of each strategy through decision analysis, and build on previous work in behavioral ecology and demography. First, relevant behavioral mechanisms should be included in demographic models used for conservation decision-making. Second, I propose rapid behavioral assessment as a useful tool to approximate demographic rates through regression of demographic phenomena on observations of related behaviors. This technique provides behaviorally estimated parameters that may be applied to population viability analysis for use in management. Finally, behavioral indices can be used as warning signs of population decline. The proposed framework combines each strategy through decision analysis to provide quantitative rules that determine when incorporating aspects of conservation behavior may be beneficial to management. Chapter III applies this technique to estimate birthrate in a colony of California sea lions in the Gulf of California, Mexico. This study includes a cost analysis of the behavioral and traditional parameter estimation techniques. I then provide in Chapter IV practical recommendations for applying this framework to management programs along with general guidelines for the development of rapid behavioral assessment.
Dissertation/Thesis
M.S. Biology 2012
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Books on the topic "Population Viability Assessment"

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Ruth, Janet M. Status assessment and conservation plan for the Grasshopper sparrow (Ammodramus savannarum). Falls Church, VA: Department of Interior, U.S. Fish & Wildlife Service, 2015.

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Resources, United States Congress House Committee on. Scientific assessments of declining pelagic fish populations in the California Bay-Delta: Oversight field hearing before the Committee on Resources, U.S. House of Representatives, One Hundred Ninth Congress, second session, Monday, February 27, 2006, in Stockton, California. Washington: U.S. G.P.O., 2006.

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Population and Habitat Viability Assessment Workshop (2005 Dhaka, Bangladesh). Conservation of western hoolock gibbon (hoolock hoolock hoolock) in India and Bangladesh: Population and Habitat Viability Assessment (P.H.V.A.) Workshop report. Edited by Molur Sanjay, Wildlife Trust of Bangladesh, and U.S. Fish and Wildlife Service. Coimbatore: Zoo Outreach Organisation in collaboration with Wildlife Information & Liaison Development Society, 2005.

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Population, and Habitat Viability Assessment Workshop (1995 Aug 21-24 Austin Tex ). Golden-cheeked warbler population and habitat viability assessment report: Report of a workshop arranged by the U.S. Fish and Wildlife Service. [Washington, D.C: U.S. Fish and Wildlife Service, 1995.

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Population and Habitat Viability Assessment Workshop (1995 Sept. 18-21 Austin, Tex.). Black-capped vireo population and habitat viability assessment report: Report of a workshop arranged by the U.S. Fish and Wildlife Service. [Washington, D.C.?]: The Service, 1995.

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Population and Habitat Viability Assessment Workshop (1995 Aug. 21-24 Austin, Tex.). Golden-cheeked warbler population and habitat viability assessment report: Report of a workshop arranged by the U.S. Fish and Wildlife Service. [Washington, D.C: U.S. Fish and Wildlife Service, 1995.

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Population and Habitat Viability Assessment Workshop (1995 Sept. 18-21 Austin, Tex.). Black-capped vireo population and habitat viability assessment report: Report of a workshop arranged by the U.S. Fish and Wildlife Service. [Washington, D.C.?]: The Service, 1995.

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Population and Habitat Viability Assessment Workshop (1995 Sept. 18-21 Austin, Tex.). Black-capped vireo population and habitat viability assessment report: Report of a workshop arranged by the U.S. Fish and Wildlife Service. [Washington, D.C.?]: The Service, 1995.

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Population and Habitat Viability Assessment Workshop (1995 Sept. 18-21 Austin, Tex.). Black-capped vireo population and habitat viability assessment report: Report of a workshop arranged by the U.S. Fish and Wildlife Service. [Washington, D.C.?]: The Service, 1995.

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Population and Habitat Viability Assessment Workshop (1995 Aug. 21-24 Austin, Tex.). Golden-cheeked warbler population and habitat viability assessment report: Report of a workshop arranged by the U.S. Fish and Wildlife Service. [Washington, D.C: U.S. Fish and Wildlife Service, 1995.

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Book chapters on the topic "Population Viability Assessment"

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Schwartz, M. W., and C. A. Brigham. "Why Plant Population Viability Assessment?" In Ecological Studies, 3–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-09389-4_1.

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Akçakaya, H. Reşit. "Population Viability Analysis and Risk Assessment." In Wildlife 2001: Populations, 148–57. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2868-1_14.

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Vielreicher, Martin, and Oliver Friedrich. "Assessment of Population and ECM Production Using Multiphoton Microscopy as an Indicator of Cell Viability." In Methods in Molecular Biology, 243–55. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6960-9_19.

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Thomas, I. F., N. A. Porter, and P. Lappas. "Assessment of the Viability of Vegetable Oil Fuels: Species, Land, Social, Environmental, Population and Safety Considerations." In Sustainable Automotive Technologies 2014, 197–215. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17999-5_19.

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Pierard, Luc A., Paola Gargiulo, Pasquale Perrone-Filardi, Bernhard Gerber, and Joseph B. Selvanayagam. "Assessment of viability." In The ESC Textbook of Cardiovascular Imaging, edited by José Luis Zamorano, Jeroen J. Bax, Juhani Knuuti, Patrizio Lancellotti, Fausto J. Pinto, Bogdan A. Popescu, and Udo Sechtem, 545–64. Oxford University Press, 2021. http://dx.doi.org/10.1093/med/9780198849353.003.0037.

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Ischaemic left ventricular (LV) dysfunction due to coronary artery disease (CAD) is steadily increasing as a consequence of the ageing of the population and of improved survival of patients with acute coronary syndromes and currently represents the first cause of heart failure (HF). Myocardial function is dependent on blood supply, as anaerobic reserve is minimum due to a nearly maximal arteriovenous oxygen extraction. At rest, myocardial blood flow remains normal even in the presence of severe coronary artery stenosis (up to 85% diameter stenosis) by coronary autoregulation. In the presence of transstenotic pressure gradient due to epicardial coronary stenosis, arteriolar dilatation maintains normal myocardial flow at rest but with a progressive reduction in flow reserve. When arteriolar dilatation is maximal, autoregulation is exhausted and myocardial ischaemia develops. The limit of autoregulation depends on myocardial oxygen demand and is influenced by heart rate. Tachycardia increases oxygen demand and supply is reduced because of a decreased diastolic perfusion time. In the presence of acute ischaemia, there is a close relation between subendocardial perfusion and transmural function. Indeed, the contribution of subendocardium to myocardial thickening largely exceeds the contribution of the subepicardium. Akinesia can therefore result from subendocardial ischaemia and transmural ischaemia is not necessary. This chapter looks at how viability of the different techniques for treating myocardial dysfunction is assessed.
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With, Kimberly A. "Landscape Effects on Population Distributions and Dynamics." In Essentials of Landscape Ecology, 291–336. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198838388.003.0007.

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The distribution and dynamics of populations reflect the interplay between dispersal and demography with landscape structure. Understanding how landscape structure affects populations is essential to effective habitat management and species conservation, especially within landscapes undergoing habitat loss and fragmentation as a result of human land-use activities. This chapter thus begins with an overview of the effects of habitat loss and fragmentation on populations, followed by a discussion of species distribution modeling. Then, because population assessment figures so prominently in evaluating a species’ extinction risk to landscape change, the chapter considers the different classes of population models used to estimate population growth rates and population viability, including the use of metapopulation and spatially explicit simulation models.
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Kadian, Abhishek, Sachin Saini, and Rajesh Khanna. "Frostbite: A Conundrum in High Altitudes." In Military Medicine [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96286.

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Cold injuries and its sequelae has for decades, been a relevant problem and an occupational hazard in the army, and continue to be so. These sequelae may hamper future operational capability of the soldier. Frostbite is also becoming more prevalent among the general population due to the increase in numbers of homeless people, along with an increasing participation in outdoor activities such as mountain hiking and skiing. Despite the advances in the field of medical sciences, frostbite management has remained constant and unchanged until recent years, when newer modalities of management have led to favourable, tissue-saving, outcomes. This chapter gives a background understanding of risk factors of frostbite and its pathophysiology and reviews the current evidence and latest frostbite management strategies. In addition, several adjunctive therapies and recent improvements in radiologic assessment of tissue viability provide new avenues of aggressive medical management and earlier surgical interventions.
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"Eels at the Edge: Science, Status, and Conservation Concerns." In Eels at the Edge: Science, Status, and Conservation Concerns, edited by Giulio A. De Leo, Paco Melià, Marino Gatto, and Alain J. Crivelli. American Fisheries Society, 2009. http://dx.doi.org/10.47886/9781888569964.ch22.

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<em>Abstract.—</em>We critically review population dynamics models developed for <em>Anguilla </em>spp. eels. Despite the (quasi) panmictic nature of temperate eel species, most modeling effort has focused on subpopulations within specific brackish or inland water bodies. Models have been developed along three major lines: cohort approaches, input-output models that directly relate juvenile recruit abundance to migrating mature eels, and stage- or size-structured population models, or both, some of which explicitly account for the observed variability of eel life traits. More recently, attempts have been made to extend demographic analyses to the oceanic phase of the eel life cycle. We discuss eel population models in terms of mathematical complexity and usability, amount and quality of data required for calibration, realism in the description of life cycle and demographic parameters, potential for analyzing different fisheries management strategies, and inclusion of environmental and interindividual stochasticity and uncertainty in parameter estimation. While site-specific analyses are needed to understand eel life history in the continental phase, the generalized decline of eel recruitment requires a global assessment of metapopulation viability under different hypotheses and scenarios. Given the high number of unknowns and untested hypotheses, we emphasize the need to explicitly model uncertainty in parameter estimation and environmental and interindividual stochasticity (e.g., by using bootstrap techniques and Monte Carlo simulations). There is an urgent need for population models that can be used for conservation-based eel management in broad geographic areas where few data are available.
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Conference papers on the topic "Population Viability Assessment"

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Roberts, Treacy Anne, and Natasha Theresa Gaskin-Peters. "Early Interventions for Guyanese Business Development and Optimization." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31016-ms.

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Early Intervention and Local Content Optimization Esso Exploration and Production Guyana Limited ("ExxonMobil"), an affiliate of Exxon Mobil Corporation, and its co-venturers Hess Guyana Exploration Limited and CNOOC Petroleum Guyana Limited, discovered oil in the Stabroek block offshore Guyana during the first half of 2015. The success of safely drilling their first well (Liza-1), followed a history of 40 dry holes in the Guiana Basin prior to ExxonMobil beginning ultra-deepwater oil and gas exploration in 2008 (Varga et al. 2021). Guyana, with a small population of 750,000, was primarily economically focused on agriculture, manufacturing, and the mining of bauxite and gold. ExxonMobil identified the need for an early, focused, coordinated, and long-lasting approach to local content planning to provide tangible results for Guyana. Developing local businesses to actively participate in the industry and enter the supply chain while raising awareness of how the oil and gas industry operates was paramount, as was managing expectations of the Guyanese government and populace about local content. ExxonMobil recognized that the established mining sector in Guyana had the potential to provide a base of local suppliers able to transition into the emerging oil and gas sector. It subsequently undertook a number of assessments and studies on the local economy to further understand the local context. The finding of these assessments highlighted that most Guyanese companies were operating in the small local economy or working within the Caribbean region, limiting their exposure to international standards and providing little impetus to become globally competitive. Despite having technical competencies that could be utilized in the oil and gas industry, shortfalls were apparent in the areas of auditable systems, business processes, quality assurance, and safety. Closing the gaps would take time and investment, and a shift in culture in some parts. An internal assessment of ExxonMobil's supplier development programs was conducted, and a Guyana supplier development program was developed by drawing from best practices around the globe. ExxonMobil, with the support of its Stabroek Block co-venturers, took a proactive decision and devised a plan to engage an independent third party to run a "fit for purpose" enterprise development centre (EDC) to support the technical development in country through local content prior to final investment decision (FID). In order to be equipped to provide early roll out of local content development, and 6 months before FID for Liza 1, ExxonMobil released a Request for Proposal (RFP). Bidders were invited to submit proposals on how the EDC would function "fit for purpose" and compliment rather than compete with current Guyanese activities and vendors. The successful bidder, DAI Global LLC (DAI), had a proven track record of international socioeconomic project successes and was selected to form a unique and collaborative, strategic relationship with ExxonMobil. Although DAI had previous experience in nascent markets, the challenge in Guyana was to expand the Guyanese supplier base into a new sector. The global experience of both ExxonMobil and DAI worked in tandem to produce a flexible management structure with the capability to adapt to the ensuing exploration successes and expanding industry needs. Both short and long term programs would be utilized to engage businesses for the changing needs of businesses during varying developmental stages. Additionally, ExxonMobil's foresight to incorporate local content requirements and contractual use of the centre into prime contractor contracts provided support for the long-term viability of the EDC. The EDC established in Guyana was named The Centre for Local Business Development (Centre). The Centre design provides a supportive environment where seeking and acquiring information about the oil and gas sector is a comfortable experience. Inclusive of classrooms, meeting spaces, offices, and networking areas, the Centre sponsors engaging programs and provides mentorship for companies entering the industy. Drawing upon studies and data to drive the content and focus of its programs, the Centre addresses relevant needs in the business community. For example, a DAI baseline study on the international competitiveness of local businesses showed that two-thirds of Guyanese businesses were not internationally competitive and needed support with basic business systems (e.g. financial management, supply chain management and human resources). Other stakeholder focus group studies conducted by ExxonMobil determined that there was a lack of foundational knowledge about the oil and gas sector. Having access to this research pre-FID allowed for a head start on planning and enabled the implementation of a work program just 3 months after the Centre's opening.
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