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Dissertations / Theses on the topic 'Freshwater diversity'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Giaramida, Luca. "Freshwater bacterial diversity, functions and stability." Thesis, Robert Gordon University, 2013. http://hdl.handle.net/10059/843.

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Biodiversity is declining worldwide with detrimental effects on ecosystems functions and services that it sustains. The relationship between biodiversity and freshwater purification remains unclear. Freshwater purification is of paramount importance for humankind as eighty percent of the world’s population is exposed to high levels of threat in terms of water security. Bacteria are the most diverse and abundant organisms on Earth and they play, directly or indirectly, a key role in the majority of ecosystem services including water purification. The current work aimed, in freshwater systems, t

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2

Do, Van Tu. "Freshwater crabs of Vietnam: diversity and conservation." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-190347.

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The freshwater crab fauna of Vietnam has a high diversity and endemism, 49 species have been recorded and 42 of them are only known from this country. In addition, many species are undescribed or undiscovered while at least 10% of known species are facing extinction. Water pollution, urban, industrial and agricultural development, habitat loss and fragmentation, deforestation and overexploitation are the main threats to this fauna. The first conservation recommendation is keeping rain forest tracts large enough to maintain habitat and water quality for long-term survival of these crabs. More r

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3

Seale, Tarren. "Characterization of Escherichia coli diversity in a freshwater environment." Diss., University of Pretoria, 2014. http://hdl.handle.net/2263/79184.

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Escherichia coli (E. coli) is an indicator of faecal contamination as it is assumed that faecal contamination is the main source of these bacteria in the environment. Recent studies have, however, shown that E. coli can be found in the environment without any apparent link to faecal contamination. These environmental E. coli isolates multiply and survive in niches including soil, sand, sediment and water. Environmental E. coli are usually associated with phylogroups A and B1, two of the 7 phylogroups (A, B1, B2, C, D, E and F) typically used to group E. coli isolates. Some environmental isolat

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4

Do, Van Tu. "Freshwater crabs of Vietnam: diversity and conservation: Review paper." Technische Universität Dresden, 2014. https://tud.qucosa.de/id/qucosa%3A29079.

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The freshwater crab fauna of Vietnam has a high diversity and endemism, 49 species have been recorded and 42 of them are only known from this country. In addition, many species are undescribed or undiscovered while at least 10% of known species are facing extinction. Water pollution, urban, industrial and agricultural development, habitat loss and fragmentation, deforestation and overexploitation are the main threats to this fauna. The first conservation recommendation is keeping rain forest tracts large enough to maintain habitat and water quality for long-term survival of these crabs. More r

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5

Cai, Ji. "Ecology and diversity of freshwater picocyanobacteria in Japanese lakes." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263502.

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6

Sternberg, David. "Life-History Traits and the Functional Diversity of Australian Freshwater Fish." Thesis, Griffith University, 2014. http://hdl.handle.net/10072/367236.

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Australian freshwaters are home to approximately 256 fish species from 36 families, many of which are endemic to the country and considered threatened, vulnerable or rare in the wild. In part this is due to a long history of continental isolation where increasing aridity and flow unpredictability have given rise to a fish fauna characterised by a unique association of life-history traits (i.e. characteristics of an organism that contribute to its fitness or performance, and which allow it to function in the environment) in order to cope with natural variation in environmental seasonality, stab

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7

Tsui, Kin-ming. "Biodiversity and longitudinal distribution of fungi on submerged wood, with reference to human disturbance /." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21375458.

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8

Lang, Pauline. "Processes driving freshwater plant production and diversity in upland streams." Thesis, University of Glasgow, 2010. http://theses.gla.ac.uk/1864/.

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Upland headwater streams are important sources of freshwater in mountainous temperate to sub-arctic latitude European countries like Scotland. Yet much less is known about the ecology of small, characteristically oligotrophic, mountain streams supporting periphyton and aquatic bryophyte dominated vegetation, and their potential bioindicator capacity of environmental water quality, than lowland rivers impacted by anthropogenic disturbance, in this context. This scarcity of knowledge has significant implications for the success of the recently implemented Water Framework Directive (WFD: 2000/60/

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9

Shams, Shiva. "Diversity, impact and fate of cyanobacterial toxins in freshwater ecosytems." Doctoral thesis, country:DE, 2015. http://hdl.handle.net/10449/24890.

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Massive proliferations of cyanobacteria (bloom) are common in aquatic environments worldwide. These blooms are often toxic due to the presence of hepatotoxins or neurotoxins and have become a worldwide environmental problem. Various incidents of animal and human poisonings have been attributed to these toxins. Therefore, monitoring of potentially toxic cyanobacteria and the associated toxins need to be investigated routinely in each water body. In the first part of present study, LC-MS methods were applied for identifying and quantifying cyanotoxins diversity in Lake Garda. Anatoxin-a (ATX) a

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10

Gardezi, Tariq. "Spatial scale and the ecological determinants of the distribution and diversity of fishes in Ontario lakes." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115911.

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Data on the occurrence of freshwater fishes in Ontario lakes were used to evaluate the scale of the processes that are primarily responsible for shaping their distributions and patterns of diversity. In Chapter 2 it is shown that, regardless of the scale of analysis, the most important factors structuring their distributions are climatic measures of energy, suggesting that species tend to be able to survive heterogeneous conditions falling within large areas encompassing their climatic affinities. In Chapter 3 it is shown that the relationship between species richness and energy (annual potent

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11

Peter, Hannes. "Diversity and Ecosystem Functioning : Redundancy and Resilience in Freshwater Bacterial Communities." Doctoral thesis, Uppsala universitet, Limnologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-160780.

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Bacteria are immensely diverse and hold key-positions in essentially all biogeochemical cycles. In freshwater ecosystems, bacteria degrade and mineralize organic compounds, linking the pool of dissolved organic matter to higher trophic levels. Aware of the global biodiversity loss, ecologists have started identifying the relationship of diversity and ecosystem functioning. Central to this is the question if species can functionally replace other species, hence being functionally redundant. Functional redundancy might allow communities to maintain functioning when diversity is lost. Due to thei

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12

Nigro, Lisa M. "Distribution and Diversity of Bacterial Chemolithotrophs in Marine and Freshwater Sediments." Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/NigroLM2006.pdf.

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13

Cai, Lei, and 蔡磊. "Fungal diversity from freshwater & riparian habitats and phylogeneticsof the Sordariales." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36773827.

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14

Ahmad, Amirrudin Bin. "Biological diversity of freshwater fishes in small streams in peninsular Malaysia." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3144.

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Peninsular Malaysia has a diverse flora and fauna, much of which is yet to be documented. The freshwater fishes are one important group that have received little attention. Accordingly, the overarching goal of my study is to investigate the pattern of species richness and analyse the community composition and assemblage structure of fishes in the small streams in Peninsular Malaysia. Small stream habitats appeared to be particularly important repositories of fish biodiversity in this region thus obtaining a reliable census of species occurring in such habitats is critical for conservation and

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15

Rosenkranz, Helen. "Diversity, structure and functioning of freshwater biofilms in response to herbicides." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.665172.

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Various approaches have been published aimed at assessing the impact of herbicides on river biofilms, by conducting field and laboratory experiments. The vast majority focusses on laboratory standardised growth inhibition tests conducted on isolated single species, rather than on whole communities. In this thesis three different consecutive experimental approaches were conducted integrating different ecological complexities to determine the impact of herbicides on phototrophic river biofilms. Chlorotoluron and the glyphosate formulation Roundup®, two herbicides with different modes of action,

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16

Cai, Lei. "Fungal diversity from freshwater & riparian habitats and phylogenetics of the Sordariales." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36773827.

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17

Thompson, Patrick Lyn. "Regional plankton diversity as a buffer against environmental change in freshwater ecosystems." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/17411.

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Many experiments show that species diversity at small, local scales affects ecosystems; however, conservation is concerned with extinctions of species across broad landscapes. The relevance of global or regional diversity to ecosystems therefore remains in question. I asked whether regional biodiversity in freshwater zooplankton affects the resilience and resistance of local ecosystems to the multiple stressors of warming and salinization. I hypothesised that dispersal of species from the regional community should buffer ecosystems against environmental change by providing species with

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18

Shams, Shiva [Verfasser]. "Diversity, impact and fate of cyanobacterial toxins in freshwater ecosystems / Shiva Shams." Konstanz : Bibliothek der Universität Konstanz, 2015. http://d-nb.info/1114886548/34.

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19

He, Fengzhi [Verfasser]. "Diversity and risk patterns of freshwater megafauna: A global perspective / Fengzhi He." Berlin : Freie Universität Berlin, 2019. http://d-nb.info/1192304152/34.

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20

Jackson, Chtaura. "Factors Influencing Macroinvertebrate Diversity and Community Composition in Riverine Freshwater Rock Pools." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2311.

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I examined a system of 378-riverine rock pools situated along the James River in Richmond, Virginia, to uncover the factors influencing their macroinvertebrate diversity and community composition. I characterized (total = 60) the physical characteristics, water quality, hydrology, and community assemblages in July 2009 for a subset of pools. I examined whether selected environmental factors (pH, nearest neighbor distance, depth, surface area and inundation height) were related to macroinvertebrate diversity and community composition. Species richness and total abundance of all taxa increased w

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21

Fawcett, James. "Muddy Waters: A Molecular Approach to Clarifying Freshwater Mussel Diversity in Australia." Thesis, Griffith University, 2009. http://hdl.handle.net/10072/367764.

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Historically, when the terms “conservation, threatened, endangered or extinct” were used, it was in reference to vertebrate animal species. Funding for conservation and policy implementation for protection of invertebrates has historically been difficult, even though 95% of all animal species are invertebrates and are an important component of many ecosystems. Human impact on the earth has influenced the natural population structure of many organisms, through habitat destruction, fragmentation and degradation. Issues that affect population structure and dispersal are heightened when that speci

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22

Thrush, Mariah A. "Analyzing Algal Diversity in Aquatic Systems Using Next Generation Sequencing." Ohio University Honors Tutorial College / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1366807717.

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23

David, Gwendoline. "Spatio-temporal structuring of microbial communities in freshwater ecosystems." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASL049.

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Les microorganismes constituent la forme de vie la plus abondante et diverse sur Terre et ils présentent une grande diversité phylogénétique et métabolique. Ils sont donc impliqués dans les cycles biogéochimiques et les réseaux trophiques, ce qui en fait des acteurs clés du fonctionnement des écosystèmes. Pour décrypter l'écologie des microorganismes, il est essentiel de prendre en compte les échelles spatiales, temporelles et taxonomiques. Bien que des paramètres abiotiques et biotiques aient été identifiés comme influençant la composition des communautés microbiennes dans les écosystèmes aqu

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24

Dhanasekaran, Vijaykrishna. "Freshwater fungi biodiversity, origins and molecular taxonomy /." Thesis, Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B32017583.

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25

Sutherland, Darin Lee. "Phylogeography and Ecology of New Zealand Freshwater Amphipoda (Paracalliope, Paraleptamphopus, and Phreatogammarus)." The University of Waikato, 2006. http://hdl.handle.net/10289/2650.

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ABSTRACT This thesis examines phylogenetic patterns in three New Zealand amphipod taxa in relation to current geographic distributions and historical climatic (e.g. glaciation, marine inundation) and geological (e.g. mountain building) events using DNA sequencing and distributional data. It also examines how recognition behaviour can be used to delineate potential species boundaries and to assess the role of sexual selection. The endemic genus Phreatogammarus has been found in only a limited number of sites and is not very abundant. An analysis of the genetic variation of two species within t

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26

Schmitzer, Daemon Thomas. "Diversity of Shenango River Fish at Sites with Varying Types of Land Use." Youngstown State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1285260725.

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27

Compte, Port Sergi. "Factors affecting the distribution, abundance and diversity of uncultured archaeal groups in freshwater sediments." Doctoral thesis, Universitat de Girona, 2018. http://hdl.handle.net/10803/663927.

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Archaea are abundant in extreme environments but they are also a prevalent component of microbial communities in soils, marine or freshwater plankton and sediments. Many studies highlighted the prominent role of marine sedimentary Archaea in global nutrient cycles. Less information is available, however, on the diversity, abundance and ecological role of Archaea in freshwater sediments. A serious pitfall for the study of Archaea is their low cultivability under laboratory-controlled conditions thus constraining the progress towards the complete understanding of their metabolic capabilities and

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28

Bradburn, Megan Rabeni Charles F. "A study of the abundance, diversity, and recruitment status of freshwater mussels in the Marais des Cygnes River, Kansas." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6581.

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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on October 20, 2009). Thesis advisor: Dr. Charles Rabeni. Includes bibliographical references.

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29

Schultz, Rachel Eileen. "Plant Diversity and Community Composition Effects on Carbon Cycling and Nitrogen Partitioning in Freshwater Wetlands." The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275400132.

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30

Lymer, David. "Significance and Diversity of Lake Bacteriophages." Doctoral thesis, Uppsala : Uppsala universitet, Universitetsbiblioteket, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9499.

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31

Begley, Matthew T. "Assessment of the freshwater mussel community of the upper Mahoning River watershed and factors influencing diversity and abundance in small streams." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1421151683.

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32

Toussaint, Aurèle. "Diversité fonctionnelle des poissons d'eau douce à l'échelle mondiale : patrons, déterminants et impacts des activités humaines." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30403.

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Pendant longtemps, la biodiversité était caractérisée uniquement par sa diversité taxonomique, c'est-à-dire par le nombre et la composition en espèces des assemblages. Cependant, de récentes études montrent que la biodiversité ne peut être résumée uniquement à cette composante, car elle ne prend pas en compte les caractéristiques écologiques des espèces. Pour cela, la diversité fonctionnelle est un outil permettant de considérer les traits fonctionnels des espèces. Peu d'études à larges échelles ont décrit cette facette de la biodiversité et son lien avec la diversité taxonomique. L'objectif d

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33

Astorga, A. (Anna). "Diversity patterns in marine and freshwater environments:the role of environmental and spatial factors across multiple scales." Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514292293.

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Abstract Recognition of the importance of a regional perspective for understanding the structure and dynamics of local assemblages has stimulated the emergence of the field of macroecology. Most attention has been directed to terrestrial ecosystems, while large-scale patterns in biodiversity of aquatic organisms have received less attention. In this thesis I examined patterns of aquatic diversity across several geographic areas and scales, in an effort to understand some of the environmental and spatial factors determining species diversity in aquatic environments. The main objectives of this

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34

Sanderson, Louis. "Changes in fish diversity due to hydrologic and suspended sediment variability in the Sandusky River, Ohio a genetic programming approach /." Bowling Green, Ohio : Bowling Green State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1245699638.

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35

Slothouber, Galbreath Johanna Gerarda Maria. "The impact of intercontinental invasion on host genetic and microsporidian parasite diversity in the freshwater amphipod Crangonyx pseudogracilis." Thesis, University of Leeds, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421445.

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36

Levado, Eugenia Semjonovna. "Studies on phytoplankton diversity within the water column of two freshwater lakes - Rostherne Mere (UK) and Lake Glubokoe (Russia)." Thesis, University of Manchester, 2001. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488134.

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Studies have been carried out on the phytoplankton of two freshwater lakes-eutrophic Rostherne Mere (Cheshire, UK) and mesotrophic Lake Glubokoe (Moscow region, Russia). Diversity was investigated in relation to two major aspects : (a) species composition, with indices of diversity being estimated from phytoplankton cell and colony counts, and (b) intraspecific diversity, looking at variation in elemental composition within selected species. The major genera of phytoplankton in Rostherne Mere included Stephanodiscus and Asterionella (spring diatom bloom), Chlamydomonas and Sphaerocystis (clear

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Khachonpisitsak, Salinee. "Biodiversity assessment of freshwater fishes : Thailand as a case study." Thesis, University of St Andrews, 2012. http://hdl.handle.net/10023/3559.

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A key challenge in biodiversity is: How many species are there on earth? This issue is especially acute in poorly surveyed regions with high diversity, particularly Southeast Asia that also experiences many limitations such as lack of funds, documents and experts. To help meet this challenge, I have developed a five-tiered approach for diversity measurement of freshwater fish for use in Thailand. This is: (1) the creation of a newly updated species inventory that uses existing data; (2) exploration of the patterns of species richness, endemism, and uniqueness; (3) estimation of the total speci

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Kareyva, Albert Joseph. "A study to measure pollution effects on the antithermal maintenance and diversity index of stream periphyton of Little Cedar Creek and to illustrate the succession of the diatom fraction." Instructions for remote access. Click here to access this electronic resource. Access available to Kutztown University faculty, staff, and students only, 1985. http://www.kutztown.edu/library/services/remote_access.asp.

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Thesis (M.S.)--Kutztown University.<br>Source: Masters Abstracts International, Volume: 45-06, page: 3039. Typescript. Abstract precedes thesis as preliminary leaves [1-4]. Includes bibliographical references (leaves [51-52]).

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Motz, Gary J. "Mollusc Diversity in the Marine and Continental Realms: A Case Study of the Estuary Effect." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1275740740.

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Adamson, Eleanor A. S. "Influence of historical landscapes, drainage evolution and ecological traits on patterns of genetic diversity in Southeast Asian freshwater snakehead fishes." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/39612/1/Eleanor_Adamson_Thesis.pdf.

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Snakehead fishes in the family Channidae are obligate freshwater fishes represented by two extant genera, the African Parachannna and the Asian Channa. These species prefer still or slow flowing water bodies, where they are top predators that exercise high levels of parental care, have the ability to breathe air, can tolerate poor water quality, and interestingly, can aestivate or traverse terrestrial habitat in response to seasonal changes in freshwater habitat availability. These attributes suggest that snakehead fishes may possess high dispersal potential, irrespective of the terrestrial ba

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Dammannagoda, Acharige Lalith Keerthiratne. "An investigation of functional diversity of endogenous cellulase and expression of other digestive enzyme genes in freshwater crayfish (Cherax) species." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/75462/2/Lalith_Dammannagoda_Acharige_Thesis.pdf.

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The project evaluated potential of soluble cellulose as a cheap feed ingredient for major farmed Australian freshwater crayfish species testing their growth performance, digestive enzyme activity and digestive enzyme gene expression patterns. Test animals showed an innate capacity to utilise a range of carbohydrate sources including complex structural polysaccharides. Results suggest that more plant-derived ingredient can be incorporated in formulated low-cost feeds for the culture industry.

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Ivanikova, Natalia Valeryevna. "Lake Superior Phototrophic Picoplankton: Nitrate Assimilation Measured with a Cyanobacterial Nitrate-responsive Bioreporter and Genetic Diversity of the Natural Community." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1142559572.

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Alexander, Christopher E. "The Effects of Acid Mine Drainage on the Community Composition and Diversity of Benthic Macroinvertebrates at a Regional Scale." Ohio University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1213387349.

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Dickinson, Sarah Beth. "Influences of Soil Amendments and Microtopography on Vegetation at a Created Tidal Freshwater Swamp in Southeastern Virginia." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/35124.

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The purpose of this study was to determine the effects of amendments (control, (1x) compost, (2x) compost, (TS) topsoil, and 1x+TS) and microtopography (level, pit and mound) on three parameters (plant species composition, above-ground characteristics of Taxodium distichum, and plant root characteristics) of vegetation growing at a created tidal freshwater swamp in Virginia. None of the soil treatments met the traditional vegetation criteria for federal wetland jurisdictional determination, which only considers dominant species. When the same criteria were used for all of the species, the cont

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Flach, Pamela Ziliotto Sant Anna. "Partição aditiva da diversidade de nematoda em lagoas costeiras : componentes espaciais e ambientais." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17339.

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A partição aditiva da diversidade tem recebido cada vez mais atenção dos ecólogos, sendo utilizada como uma abordagem para fracionar a diversidade ao longo de múltiplas escalas. A abordagem permite ainda testar se a diversidade em cada uma das escalas é maior ou menor do que o esperado segundo uma distribuição de indivíduos ao acaso nas unidades amostrais. Este trabalho avalia a diversidade alfa e beta de nematódeos em cinco escalas espaciais (de cm a km). A importância de componentes ambientais e geográficos (dentro de lagoas e entre lagoas) na diversidade desses organismos também é estimada.

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46

Suurkuukka, H. (Heli). "Spatial and temporal variability of freshwater biodiversity in natural and modified forested landscapes." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526207087.

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Abstract Understanding of natural and human induced changes to freshwater biodiversity patterns is critical for efficiently conserving and managing these highly impacted ecosystems. In this doctoral thesis, I study the natural spatial and temporal variability of littoral macroinvertebrate communities, as well as aquatic biodiversity responses (of bryophytes, macroinvertebrates and diatoms) to human impact on forested headwater streams. I also study the temporal variability of natural and human-impacted stream communities. I show that littoral macroinvertebrate communities are most variable bet

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Leria, Florensa Laia. "Understanding the processes that shape the genetic diversity of freshwater planarians (Platyhelminthes, Tricladida, Dugesiidae) = Estudi dels processos que modelen la diversitat genètica en les planàries d'aigua dolça (Platyhelminthes, Tricladida, Dugesiidae)." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/668257.

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The main goal of the present thesis has been to shed light into the processes that shape the genetic diversity of organisms, focussing in the following factors: the type of reproduction, the morphological diversity of genitalia, the karyological diversity, and the paleogeographic and paleoclimatic events. To do so, we have used as model organisms two different genera of freshwater planarians, viz. the genus Schmidtea and several Dugesia species from the Western Mediterranean region, focussing on the species D. subtentaculata. The analysis of the impact of the type of reproduction into the

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Winser, Helena. "Host - parasite interactions: : the relationship between encystment load of the freshwater pearl mussel (Margaritifera margaritifera) and genetic diversity of its host (Salmo trutta)." Thesis, Karlstads universitet, Institutionen för miljö- och livsvetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-38777.

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The freshwater pearl mussel (FPM, Margaritifera margaritifera) is an endangered bivalve mollusc with an obligatory larval parasitic phase on brown trout (Salmo trutta). The FPM has declined throughout its entire range due to causes such as habitat degradation, eutrophication, acidification, changed hydrology and lack of host fish. This study aimed to investigate if heterozygosity, allelic richness, number of alleles, inbreeding and differentiation of brown trout (Salmo trutta) are related to the encystment load of glochidia larvae of the FPM. The results showed that the observed heterozygosity

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Busse, Svenja. "Benthic diatoms in the Gulf of Bothnia : Community analysis and diversity." Doctoral thesis, Uppsala University, Plant Ecology, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-2591.

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Abstract:

<p>Benthic diatoms are valuable tools for biological monitoring and paleo-ecological reconstruction of past environmental conditions. This thesis aims at describing size-related properties of benthic diatoms and suggests that data assessment for community analysis can be improved by considering the importance of scale. It investigates which environmental factors structure epilithic diatom communities on the coast of the Gulf of Bothnia and identifies environmental factors correlated with phytobenthic biomass. It also contributes to the floristic knowledge of the Baltic Sea. </p><p>Diatom speci

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Mukherjee, Maitreyee. "Identification, enumeration, and diversity of ammonia-oxidizing archaea in the Laurentian Great Lakes." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1368022892.

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