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Relevant bibliographies by topics / Population ecology

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Academic literature on the topic 'Population ecology'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 March 2023

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Journal articles on the topic "Population ecology"

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Shimada, Masakazu. "Population Ecology." Population Ecology 42, no. 1 (2000): 0001. http://dx.doi.org/10.1007/s101440050001.

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Shimada, Masakazu. "Population Ecology." Researches on Population Ecology 42, no. 1 (2000): 0001. http://dx.doi.org/10.1007/s101440050036.

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Lentz, G. L. "Population Ecology." Bulletin of the Entomological Society of America 33, no. 2 (June 1, 1987): 102–3. http://dx.doi.org/10.1093/besa/33.2.102a.

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SCHEMSKE, D. W. "Plant Populations: Perspectives on Plant Population Ecology." Science 227, no. 4685 (January 25, 1985): 405–6. http://dx.doi.org/10.1126/science.227.4685.405.

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Westoby, M., A. J. Davy, M. J. Hutchings, and A. R. Watkinson. "Plant Population Ecology." Journal of Applied Ecology 27, no. 1 (April 1990): 355. http://dx.doi.org/10.2307/2403593.

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Hartvigsen, Gregg, and Andrew Paul Gutierrez. "Applied Population Ecology." Ecology 78, no. 2 (March 1997): 642. http://dx.doi.org/10.2307/2266038.

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Doust, J. Lovett, A. J. Davy, M. J. Hutchings, and A. R. Watkinson. "Plant Population Ecology." Journal of Ecology 78, no. 1 (March 1990): 268. http://dx.doi.org/10.2307/2261049.

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Irwin, Rebecca E. "PLANT POPULATION ECOLOGY." Bulletin of the Ecological Society of America 85, no. 4 (October 2004): 189–91. http://dx.doi.org/10.1890/0012-9623(2004)85[189:ppe]2.0.co;2.

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Mitchell, Randy. "PLANT POPULATION ECOLOGY." Bulletin of the Ecological Society of America 86, no. 4 (October 2005): 265–66. http://dx.doi.org/10.1890/0012-9623(2005)86[265:ppe]2.0.co;2.

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Hamel, Paul B. "VB. Population Ecology." Auk 104, no. 2 (April 1, 1987): 12AA—13AA. http://dx.doi.org/10.1093/auk/104.2.t0012a.

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Dissertations / Theses on the topic "Population ecology"

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Folk, Travis Hayes Grand James Barry. "Population ecology of northern bobwhites." Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/doctoral/FOLK_TRAVIS_11.pdf.

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Shea, Katriona. "Matrix models in population ecology." Thesis, Imperial College London, 1994. http://hdl.handle.net/10044/1/10133.

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Matrix theory is a powerful tool in the study and description of populations. This study commences by discussing the theory relevant to ecological studies, before reviewing recent uses of matrix models in population dynamics. Stage-structured and multistate matrix models are then developed to describe populations of Cirsium palustre in the U.K. and of Carduus nutans in New Zealand. These models were parameterized using field data and provide information on transient dynamics, long-term growth rates, reproductive contributions and eventual stable distributions. Sensitivity and elasticity analyses allow the robustness of the models and the relative contributions of the various life history stages to the population growth rate to be assessed. In the case of C. nutans, a major weed pest ofpasture land, this allows ontogenetic states vulnerable to control by mechanical, chemical or biological means to be targeted. These models are further refined to include the effects of environmental stochasticity. For C. palustre, lack of information on the existence and persistence of a seed bank limited the model construction, and so field and greenhouse experiments were conducted to provide additional information about seed viability and the factors affecting seedUng recruitment and survival. In addition, a theoretical critique of the use in comparative ecology of elasticity analysis to detect trade-offs in life history strategies is presented. Simulation and analytical studies indicate that this approach is not valid. Finally, the use of matrix models in evolutionary demography and management strategy formulation is discussed. As a whole, this thesis illustrates the strength and versatility of matrix models used in population ecology.

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Persson, Jens. "Population ecology of Scandinavian wolverines /." Umeå : Swedish University of Agricultural Sciences, 2003. http://diss-epsilon.slu.se/archive/00000205/.

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Thesis (doctoral)--Swedish University of Agricultural Sciences, 2003.
Appendix includes reproductions of five papers and manuscripts, some co-authored with others. Includes bibliographical references. Also issued electronically via World Wide Web in PDF format; online version lacks appendix of papers.

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Hens, H. (Hilde). "Population genetics and population ecology in management of endangered species." Doctoral thesis, Oulun yliopisto, 2017. http://urn.fi/urn:isbn:9789526215853.

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Abstract Knowledge of the determinants of the viability of populations is essential in order to undertake effective conservation and management of endangered species. In this study, long-term demographic data was combined with genetic data to study the viability of an endangered orchid species, Epipactis atrorubens. The genetic analyses revealed low levels of genetic variation and the presence of population genetic differentiation independent of the spatial scale. Low levels of seed-mediated gene flow, possibly linked to low seedling recruitment, is the likely cause of the low levels of gene flow. Indications of slow post-glacial colonisation rates were found, which together with the low gene flow predict a limited capacity of the species to shift its range to more suitable habitats after environmental change. Low genetic variation as a proxy for low evolutionary potential also suggests that the species has limited capacity to adapt to new environmental conditions. Furthermore, poor seedling recruitment lowers population viability in small populations, as highlighted by the low population growth rates. In addition, we found a strong effect of stochasticity that limits the viability of populations. Both the genetic and demographic analyses indicated low viability of the studied species and that seedling recruitment could be the main determinant for the viability
Tiivistelmä Luonnonsuojelun perusta on populaatioiden elinkykyyn vaikuttavien tekijöiden tuntemus. Tässä väitöskirjatyössä tutkittiin uhanalaisen orkidean, tummaneidonvaipan (Epipactis atrorubens), elinkykyyn vaikuttavia tekijöitä yhdistämällä pitkäaikaisseurannoilla kerätyt demografiset aineistot geneettisin menetelmin kerättyihin aineistoihin. Lajin populaatioiden geneettisen muuntelun määrän havaittiin olevan pieni ja populaatioiden todettiin olevan geneettisesti erilaistuneita maantieteellisestä skaalasta riippumatta. Geneettisen erilaistumisen syy voi olla alhainen geenivirta, joka on seurausta vähäisestä siemendispersaalista ja huonosta taimettumisesta. Populaatioiden evolutiivista historiaa tutkittaessa havaittiin merkkejä hitaasta jääkauden jälkeisestä kolonisaatiosta, mikä yhdessä alhaisen geenivirran kanssa ennustaa, että lajilla on huono kyky siirtyä sille sopivammille alueille, jos ympäristö muuttuu. Huonoa evolutiivista potentiaalia kuvastava vähäinen geneettinen muuntelu ennustaa, että lajilla on huono kyky sopeutua uusiin ympäristöoloihin. Tämän lisäksi huono taimettuminen laskee elinkykyä etenkin pienissä populaatioissa, mikä näkyy muun muassa pienten populaatioiden matalina kasvukertoimina. Stokastinen vaihtelu vaikutti elinkykyä alentavasti, mikä pitäisikin huomioida nykyistä paremmin elinkykyanalyyseissä. Sekä geneettiset että demografiset analyysit osoittivat taimettumisen mahdollisesti olevan määräävä tekijä tummaneidonvaipan populaatioiden elinkyvylle

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Bill, Adam. "Nonnegative feedback systems in population ecology." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.698987.

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We develop and adapt absolute stability results for nonnegative Lur'e systems, that is, systems made up of linear part and a nonlinear feedback in which the state remains nonnegative for all time. This is done in both continuous and discrete time with an aim of applying these results to population modeling. Further to this, we consider forced nonnegative Lur'e systems, that is, Lur'e systems with an additional disturbance, and provide results on input-to-state stability (ISS), again in both continuous and discrete time. We provide necessary and sufficient conditions for a forced Lur'e system to have the converging-input converging-state (CICS) property in a general setting before specializing these results to nonnegative, single-input, single-output systems. Finally we apply integral control to nonnegative systems in order to control the output of the system with the key focus being on applications to population management.

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Rees, Mark. "The population ecology of annual crucifers." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47630.

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Ignacio, Espinoza Julio C. "Functional and Population Based Viral Ecology." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/347118.

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Viruses represent the most abundant biological entities on earth where, they are able to interact with all kingdoms of life. Yet their diversity, ecology and evolutionary aspects are only beginning to be fully elucidated, mainly due to technical limitations. The vast majority of the microbial world remains elusive to culture; more than 90% of genome sequenced viral isolates infect only 5 of the 54 prokaryotic phyla that are currently recognized. In contrast, viral metagenomics bypasses the need for cultures by directly sequencing fragmented genetic material of environmental viral communities. This dissertation uses viral metagenomics by applying well-tested bioinformatic protocols and expanding them to compare and contrast patterns of diversity, richness and specialization of large viral metagenomic datasets, in both local and global scales. First I demonstrate the utility of a functional-based perspective by adopting the protein cluster environment to estimate global viral diversity. Then, I use this PC approach to analyze metagenomes from two ecologically different environments, which by uncovering local gene specialization showcases the adequacy of a gene-centered workflow. Then I continue to expand upon this PC framework to study the Tara Oceans virome analyses of these data reveal patters of diversity that support a seed bank model. Finally, in search of a more meaningful ecological unit, I move from a gene-centered standpoint towards a population-based frame. We adopted a novel metagenomic technique that allowed me to uncover the discontinuity in the genomic sequence space, thus empirically defining a population. This final contribution will allow to sort and count viral communities, the first step to applying ecological and evolutionary theory.

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Klaoudatos, D. "Reproductive ecology, population genetics and population dynamics of selected Decapod crustaceans." Thesis, Swansea University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637807.

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The reproductive ecology of three species of Decapod crabs, the shore crab (Carcinus maenas), the velvet crab (Necora puber) and the edible crab (Cancer pagurus), were studied in Swansea Bay and South Gower. Spawning occurs over winter and spring (shore crab), winter (edible crab), and summer (velvet crab). Berried females occur in spring and summer (shore crab), winter spring and summer (edible crab), summer and autumn (velvet crab). Eggs hatch in spring and summer (shore crab, edible crab), summer and winter (velvet crab). Copulation occurs in summer and autumn (shore crab), summer, autumn and winter (edible crab, velvet crab). Shore crabs from Swansea Queen’s Dock have a different reproductive cycle compared to the shore crabs from Tawe Barrage Impoundment and Mumbles Pier. More than one spawning periods or an extended spawning period was indicated for the shore crabs in the Docks. The genetic makeup of the shore crab populations present in Swansea Queen’s Dock and Mumbles Pier was compared using SSCP and cloning analysis of the 16S rRNA. Four different haplotypes were identified all of which were present in the Docks and one in the Pier, with low level of genetic divergence, and close relationship of the identified haplotypes with published shore crab haplotypes. AMOVA showed no significant difference between the study populations and published shore crab haplotypes. However, all identified haplotypes were different from published shore crab haplotypes, indicating a degree of reproductive isolation of the Swansea shore crab populations. Analysis of the permit return data for 1980-2002 of the edible and velvet crab fishery for the South Wales Sea Fisheries Committee District indicated that a combination of factors including overfishing, environmental conditions, and the “Sea Empress” oil spill in 1996 have contributed to a decline in landings that continues to date with limited signs of recovery.

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Woods, John G. "Ecology of a partially migratory elk population." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/32392.

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In this thesis I investigate the ecology of a partially migratory (<100% of the animals migrate) population of elk (Cervus elaphus) in the Canadian Rockies. I radio-tagged elk in a 330 km² area of the Bow River valley (BRV) in Banff National Park, Alberta and followed them for 36 months. Elk movements to adjacent watersheds expanded the study area to 2900 km². My goals were to describe the seasonal movements made by BRV elk and to reach some understanding of the causes of these movements. The M/R (migrant/resident) ratios for adult bulls and adult cows were 4.3 and 0.5 respectively. Classified ground counts revealed that adult bulls made up only 11% of the population and that the overall M/R ratio for the population was 0.6. Migrations did not take elk beyond the foraging range of timber wolves (Canis lupus), their principal predator. Three cows changed migration status between years and some migrants were sympatric with residents during the rutting (breeding) season. These observations are consistent with the hypothesis that migration in elk is a conditional ESS (evolutionarily stable strategy). Although 1 adult radio-tagged bull dispersed, individual annual home-ranges of the remaining elk overlapped from year-to-year. Elk were strongly philopatric to winter, summer, and rutting ranges. There were no differences detected in the relative philopatry of bulls and cows, or of migrants and residents. Bulls had average 1-way migrations of 30 km horizontally and 840 m vertically. Cows had average 1-way migrations of 36 km horizontally and 1079 m vertically. The net energy and time investments for these movements were calculated and judged to be trivial. Elk on both high and low elevation ranges ate primarily grasses and sedges during the autumn, winter, and spring, and the leaves of deciduous shrubs during the summer. Similarities outweighed differences between high and low elevation ranges. Elk population characteristics (numbers, composition, survival, recruitment, predation, parasites, animal morphology) were measured during 1985-91 and compared with similar data gathered during 1944-69. In most respects, the population has not changed over these years and little is known of density-dependent processes.
Science, Faculty of
Zoology, Department of
Graduate

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Haak, Christian. "The concept of equilibrium in population ecology." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ57352.pdf.

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Books on the topic "Population ecology"

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Ion, Dediu. Ecologia populațiilor =: Population ecology, demecology. Chișinău: Academia Națională de Științe Ecologice, 2007.

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Symposium, British Ecological Society. Plant population ecology. Oxford: Blackwell Scientific, 1988.

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Population ecology of individuals. Princeton, N.J: Princeton University Press, 1988.

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Łomnicki, Adam. Population ecology of individuals. Princeton, N.J: Princeton University Press, 1988.

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Introduction to population ecology. Malden, MA: Blackwell Pub., 2006.

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B, Floyd R., Sheppard A. W. 1960-, and De Barro, P. J. 1963-, eds. Frontiers of population ecology. Collingwood, VIC, Australia: CSIRO Pub., 1996.

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1931-, Young Jerry H., ed. Statistical ecology: A population perspective. Boston: Kluwer Academic Publishers, 1998.

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Silvertown, Jonathan W. Introduction to plant population ecology. 2nd ed. Harlow, Essex, England: Longman Scientific & Technical, 1987.

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Silvertown, J. Introduction to plant population ecology. 2nd ed. Harlow: Longman, 1987.

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International, Ethological Conference (19th 1985 Toulouse France). Behavioral ecology and population biology. Toulouse: Privat, 1986.

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Book chapters on the topic "Population ecology"

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Frank, J. Howard, J. Howard Frank, Michael C. Thomas, Allan A. Yousten, F. William Howard, Robin M. Giblin-davis, John B. Heppner, et al. "Population Ecology." In Encyclopedia of Entomology, 3007. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6359-6_3074.

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Sutton, Julian. "Population Ecology." In Biology, 433–47. London: Macmillan Education UK, 1998. http://dx.doi.org/10.1007/978-1-349-15201-8_26.

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Cornelius, Reiner, and Andreas Faensen-Thiebes. "Population Ecology." In Progress in Botany, 333–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-75154-7_20.

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Rees, Paul A. "Population ecology." In Key questions in ecology: a study and revision guide, 100–120. Wallingford: CABI, 2020. http://dx.doi.org/10.1079/9781789247572.0100.

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Cornelius, Reiner, and Gabriele Meyer. "Population Ecology." In Progress in Botany, 401–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77047-0_20.

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Lehmann, Cornelia, Franz Rebele, and Uwe Starfinger. "Plant Population Ecology." In Progress in Botany, 502–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-59940-8_18.

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Seidling, Walter, Uwe Starfinger, and Jürg Stöcklin. "Plant Population Ecology." In Progress in Botany, 345–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78568-9_21.

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Gillman, M. "Plant population ecology." In Plant Genetic Conservation, 114–31. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-009-1437-7_7.

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Service, M. W. "Sampling the Egg Population." In Mosquito Ecology, 1–74. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1868-2_1.

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Service, M. W. "Sampling the Larval Population." In Mosquito Ecology, 75–209. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1868-2_2.

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Conference papers on the topic "Population ecology"

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Corley, Juan C. "Population ecology ofS. noctilioand its biological control agents." In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.91889.

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Sokolovich, O. A., A. K. Doroshevich, Y. V. Pavlovskaya, V. A. Gamenyuk, I. S. Shemet, and I. Z. Olevskaya. "THE IMPACT OF ECOLOGY ON THE PSYCHOLOGICAL HEALTH OF THE POPULATION." In SAKHAROV READINGS 2021: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute, 2021. http://dx.doi.org/10.46646/sakh-2021-1-38-41.

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G.E., Slyusarev. "RESTORATION OF THE STURGEON POPULATION." In II INTERNATIONAL SCIENTIFIC AND PRACTICAL CONFERENCE "DEVELOPMENT AND MODERN PROBLEMS OF AQUACULTURE" ("AQUACULTURE 2022" CONFERENCE). DSTU-Print, 2022. http://dx.doi.org/10.23947/aquaculture.2022.127-128.

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In the conditions of sanctions, the provision of fish farming products to the population is of great importance. Due to intensive hydraulic engineering, poaching and a decrease in the quality of the environment, the population has declined sharply. To date, the catches of sturgeon are not able to ensure the volume of natural reproduction of these valuable species. At the moment, the population of the sturgeon is replenished exclusively by artificial means. Consideration of ways to eliminate this problem is the most significant topic in the ecology of aquatic ecosystems.

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Udina, I. G., A. S. Gracheva, Yu А. Vasiliev, E. Yu Pobedonosteva, and O. L. Kurbatova. "PECULIARITIES OF DISTRIBUTION OF Y-CHROMOSOME HAPLOGROUPS IN GENERATIONS OF MEGAPOLIS POPULATION UNDER ACTION OF MIGRATION." In NOVEL TECHNOLOGIES IN MEDICINE, BIOLOGY, PHARMACOLOGY AND ECOLOGY. Institute of information technology, 2022. http://dx.doi.org/10.47501/978-5-6044060-2-1.110-113.

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In three generations, peculiarities of changes in the profile of Y-chromosome haplotypes were studied. Genetic demographic questionnaire collecting and genotyping by 18 STR of Y-chro-mosome were performed, haplogroups of Y-chromosome were detected. In generations of megalopolis population, specific peculiarities of the frequency profiles of Y-chromosome hap-logroups were detected, due to migration of population to megapolis. In the youngest genera-tion, in comparison with two previous generations statistically significant accumulation in the gene pool of megalopolis population “southern” by origin haplogroups bringing to megapolis with migrant flows. Obtained results are in good agreement with ethnic contents of migrants to Moscow detected by questionnaire data.

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Akhedzhak-Naguze, S. K., and A. A. Naguze. "MEDICAL AND SOCIAL PROBLEMS OF DISABILITY." In NOVEL TECHNOLOGIES IN MEDICINE, BIOLOGY, PHARMACOLOGY AND ECOLOGY. Institute of information technology, 2022. http://dx.doi.org/10.47501/978-5-6044060-2-1.185-188.

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The presented work reflects the main current data on medical and social problems of disability in the region. The authors analyzed the indicators of primary and repeated disability of the adult population of the Krasnodar Territory. The article puts forward proposals for optimizing rehabilitation and habilitation measures for this category of the population.

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Puttaraju, HP. "Impact of Wolbachia infection on population ecology of Pieridae butterflies in India." In 2016 International Congress of Entomology. Entomological Society of America, 2016. http://dx.doi.org/10.1603/ice.2016.107926.

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Ratiu, Ramona. "THE POPULATION�S PERCEPTION OF THE ENVIRONMENT�S QUALITY IN TIRGU MURES." In 14th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b52/s20.101.

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Ragulskaya, M. "COVID-19 PANDEMIC DURING THE GLOBAL SOLAR MINIMUM: GENOGEOGRAPHY, LOCKDOWNS, VACCINATION." In NOVEL TECHNOLOGIES IN MEDICINE, BIOLOGY, PHARMACOLOGY AND ECOLOGY. Institute of information technology, 2022. http://dx.doi.org/10.47501/978-5-6044060-2-1.244-247.

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The COVID-19 pandemic started at the minimums of the 11-year solar cycle and quasi-secular solar cycle. Genetic population characteristics played a decisive role in the development of local coronavirus epidemics under the conditions of the solar activity global minimum. Their contribution is more than 500% against 20-30% accounted for by other factors (except for vaccination), such as the average age of the population, lockdowns, isolation of patients, weather conditions, and the level of medicine. In Europe, the incidence of COVID-19 per mil-lion people in the R1b:R1a:N haplogroups correlates as 7:2:1. This ratio is practically inde-pendent of the pandemic waves, new coronavirus strains and the level of population vaccina-tion.

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Kozlenko, A. V. "PROBLEMS OF ECOLOGY OF ANCIENT GREECE." In SAKHAROV READINGS 2021: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute, 2021. http://dx.doi.org/10.46646/sakh-2021-1-11-14.

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The article deals with the problems of ecology of ancient Greece. Based on the data of written sources, as well as the results of paleoclimatic studies, the author comes to the conclusion that the climate in Greece of the classical era was minimally different from the modern one, but the ecological situation was somewhat different. With a large population and developed agriculture, signs of decline gradually began to appear, which included increasing soil erosion, especially on the lower slopes of the hills, as well as waterlogging of low-lying land areas. These processes were aggravated by the uncontrolled development of small-scale cattle breeding and the thoughtless destruction of woody vegetation. In the end, these processes brought the country to the brink of an ecological catastrophe and served as one of the reasons for the decline of ancient civilization.

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Anoshkina, Anna I. "The Library and ecology: The experience, traditions and innovations." In The libraries and ecological education: Theory and practice. Russian National Public Library for Science and Technology, 2020. http://dx.doi.org/10.33186/978-5-85638-227-2-2020-44-48.

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The experience and traditions of ecological education of the Republican population at A. S. Pushkin National Library, as well as the innovative vectors of these activities, are discussed, i. e. information and exhibition services, Green Living Room ecological club. The issues of interdepartmental collaboration and municipal libraries’ activities in ecological education are also examined.

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Reports on the topic "Population ecology"

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Tuljapurkar, Shripad. Theoretical studies in cooperative phenomena and population ecology. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.598.

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Joshua D. McInnes, Joshua D. McInnes. Population Ecology of Risso's Dolphins in Monterey Bay, California. Experiment, April 2018. http://dx.doi.org/10.18258/11114.

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Finch, Deborah M. Population ecology, habitat requirements, and conservation of neotropical migratory birds. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1991. http://dx.doi.org/10.2737/rm-gtr-205.

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Carlsen, T. M. Population and community ecology of the rare plant amsinckia grandiflora. Office of Scientific and Technical Information (OSTI), November 1996. http://dx.doi.org/10.2172/652959.

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Gedamke, Jason, and Daniel P. Costa. Acoustic Ecology and Remote Acoustic Monitoring of a Minke Whale Population. Fort Belvoir, VA: Defense Technical Information Center, April 2000. http://dx.doi.org/10.21236/ada376676.

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DelGuidice, Glenn D., Michael E. Nelson, and L. David Mech. Winter nutrition and population ecology of white-tailed deer in the central Superior National Forest. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1991. http://dx.doi.org/10.2737/nc-gtr-147.

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Droby, Samir, Joseph W. Eckert, Shulamit Manulis, and Rajesh K. Mehra. Ecology, Population Dynamics and Genetic Diversity of Epiphytic Yeast Antagonists of Postharvest Diseases of Fruits. United States Department of Agriculture, October 1994. http://dx.doi.org/10.32747/1994.7568777.bard.

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One of the emerging technologies is the use of microbial agents for the control of postharvest diseases of fruits and vegetables. A number of antagonistic microorganisms have been discovered which have the potential to effectively control postharvest diseases. Some of this technology has been patented and commercial products such as AspireTM (Ecogen Corporatin, Langhorne, PA, USA), Biosave 10TM and Biosave 11TM (Ecoscience Inc., Worchester, MA, USA) have been registered for commercial use. The principal investigator of this project was involved in developing the yeast-based biofungicide-AspireTM and testing its efficacy under commercial conditions. This research project was initiated to fill the gap between the knowledge available on development and commercial implementation of yeast biocontrol agents and basic understanding of various aspects related to introducing yeast antagonists to fruit surfaces, along with verification of population genetics. The main objectives of this study were: Study ecology, population dynamics and genetic diversity of the yeast antagonists Candida guilliermondii, C. oleophila, and Debaryomyces hansenii, and study the effect of preharvest application of the yeast antagonist C. oleophila naturally occurring epiphytic microbial population and on the development of postharvest diseases of citrus fruit during storage. Our findings, which were detailed in several publications, have shown that an epiphytic yeast population of grapefruit able to grow under high osmotic conditions and a wide range of temperatures was isolated and characterized for its biocontrol activity against green mold decay caused by Penicillium digitatum. Techniques based on random amplified polymorphic DNA (RAPD) and arbitrary primed polymerase chain reaction (ap-PCR), as well as homologies between sequences of the rDNA internal transcribed spacers (ITS) and 5.8S gene, were used to characterize the composition of the yeast population and to determine the genetic relationship among predominant yeast species. Epiphytic yeasts exhibiting the highest biocontrol activity against P. digitatum on grapefruit were identified as Candida guilliermondii, C. oleophila, C. sake, and Debaryomyces hansenii, while C. guilliermondii was the most predominant species. RAPD and ap-PCR analysis of the osmotolerant yeast population showed two different, major groups. The sequences of the ITS regions and the 5.8S gene of the yeast isolates, previously identified as belonging to different species, were found to be identical. Following the need to develop a genetically marked strain of the yeast C. oleophila, to be used in population dynamics studies, a transformation system for the yeast was developed. Histidine auxotrophy of C. oloephila produced using ethyl methanesulfonate were transformed with plasmids containing HIS3, HIS4 and HIS5 genes from Saccharomyces cerevisiae. In one mutant histidin auxotrophy was complemented by the HIS5 gene of S. cerevisiae is functionally homologous to the HIS5 gene in V. oleophila. Southern blot analysis showed that the plasmid containing the S. cerevisiae HIS5 gene was integrated at a different location every C. oleophila HIS+ transformant. There were no detectable physiological differences between C. oleophila strain I-182 and the transformants. The biological control ability of C. oleophila was not affected by the transformation. A genetically marked (with b-glucuronidase gene) transformant of C. oleophila colonized wounds on orange fruits and its population increased under field conditions. Effect of preharvest application of the yeast C. oleophila on population dynamics of epiphytic microbial population on wounded and unwounded grapefruit surface in the orchard and after harvest was also studied. In addition, the effect of preharvest application of the yeast C. oleophila on the development of postharvest decay was evaluated. Population studies conducted in the orchard showed that in control, non-treated fruit, colonization of wounded and unwounded grapefruit surface by naturally occurring filamentous fungi did not vary throughout the incubation period on the tree. On the other hand, colonization of intact and wounded fruit surface by naturally occurring yeasts was different. Yeasts colonized wounded surface rapidly and increased in numbers to about two orders of magnitude as compared to unwounded surface. On fruit treated with the yeast and kept on the tree, a different picture of fungal and yeast population had emerged. The detected fungal population on the yeast-treated intact surface was dramatically reduced and in treated wounds no fungi was detected. Yeast population on intact surface was relatively high immediately after the application of AspireTM and decreased to than 70% of that detected initially. In wounds, yeast population increased from 2.5 x 104 to about 4x106 after 72 hours of incubation at 20oC. Results of tests conducted to evaluate the effect of preharvest application of AspireTM on the development of postharvest decay indicated the validity of the approach.

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Elder, Timothy. Ecology and Population Dynamics of Salmonids in the Columbia River: Response of Fishes to Anthropogenic Change in a Large Riverscape. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6519.

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McGee, Steven, Jennifer Kirby, Geneva Haertel, and Angela Haydel DeBarger. Taking students on a journey to El Yunque: An examination of cognitive apprenticeship. The Learning Partnership, April 2006. http://dx.doi.org/10.51420/conf.2006.1.

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The Journey to El Yunque program was designed using the cognitive apprenticeship model. Students analyze the same data that scientists in the rainforest use for their research, while at the same time, covering all of the national middle school ecology standards. In this study we seek to build a framework that integrates design-based research methods with traditional evaluation. The resulting enactment of the curriculum provides formative feedback about the curriculum as well as about the design model itself. An ecology assessment was developed using publicly released state assessment items. A quasiexperimental design study was used to evaluate the effectiveness of the beta version of the program. The results show that Journey to El Yunque was more effective at helping students learn population dynamics, while the traditional ecology curriculum was more effective at helping students understand energy flow definitions. This difference in performance is consistent with the underlying design based on the cognitive apprenticeship model.

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McGee, Steven, Randi Mcgee-Tekula, and Noelia Baez Rodriguez. Using the Science of Hurricane Resilience to Foster the Development of Student Understanding and Appreciation for Science in Puerto Rico. The Learning Partnership, March 2022. http://dx.doi.org/10.51420/conf.2022.1.

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For school age children on the island of Puerto Rico, the back-to-back hurricane strikes of Irma and Maria were their first experience with the tragedy of hurricanes in Puerto Rico. There is much concern in the general public about the ability of the Puerto Rican forests, like El Yunque, to recover. These concerns reveal common misconceptions about the dynamics of forest ecosystems. The focus of this research is Journey to El Yunque, a middle school curriculum unit that engages students in evidence-based modeling of hurricane disturbance using long-term data about population dynamics after Hurricane Hugo. Research was guided by the following research question: How does engagement in the science of disturbance ecology impact students’ understanding of and appreciation for ecosystems dynamics? Students completed pre and post assessment understanding of ecosystems dynamics and rated the teacher implementation using the Inquiry-Based Science Teaching survey. Based on a paired t-test, students statistically increased their performance from pretest to posttest with an effect size of 0.22. At the teacher level, the Inquiry-Based Instruction score was a statistically significant predictor of the posttest performance. In other words, these results provide evidence that engaging students in the practices of ecology predicted increased understanding of population dynamics.

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