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Dissertations / Theses on the topic 'Species richness'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Norris, Beth J. "Species richness estimation for benthic data." Thesis, University of Kent, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.593918.

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This thesis addresses species richness estimation for benthic data by describing the clustering of individuals within a species using a Neyman Type A distribution, and incorporating this into species richness estimates. A review of current species richness estimation methods is included . The maximumlikelihood approach to species richness estimation is extended to incorporate the Neyman Type A model, with a gamma mixing distribution on the mean abundance of individuals within a species. Species richness estimates of this model are compared •1 to those of the simpler negative binomial and Poiss

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2

Hecnar, Stephen J. "Species richness, species turnover, and spatial dynamics of amphibian communities." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape16/PQDD_0006/NQ30275.pdf.

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3

Srivastava, Diane Sheila. "Ecological evolutionary limits of local species richness." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244120.

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4

Vonlanthen, Corinne Maria. "Alpine plant communities : ecology and species richness /." [S.l.] : [s.n.], 2005. http://www.zb.unibe.ch/download/eldiss/05vonlanthen_c.pdf.

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5

Hager, Heather Anne. "Conservation of species richness, are all umbrella species of similar quality?" Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ27503.pdf.

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6

Downer, Monica Ruth. "Plant Species Richness and Species Area Relationships in a Florida Sandhill." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4030.

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Pine sandhill are integral pyrogenic communities in the southeastern United States. Though once widespread, habitat destruction, fire suppression and fragmentation have reduced the population to nearly 3%. It is important to learn as much as possible about these unique areas in order to implement best management practices to conserve and restore the existing populations of these communities. Fire is central to the maintenance of pine sandhill communities and two conceptual hypothesis regarding burn frequency have come to light in maintaining the unique species composition and richness of these

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7

Nyberg, Kruys Åsa. "Phylogenetic relationships and species richness of coprophilous ascomycetes." Doctoral thesis, Umeå University, Ecology and Environmental Science, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-625.

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<p>Coprophilous ascomycetes are a diverse group of saprobes, of which many belong to three families, Delitschiaceae, Phaeotrichaceae and Sporormiaceae, within the large order Pleosporales. The natural relationships and circumscription of these families are unclear, especially within the family Sporormiaceae, where the generic delimitation have been questioned. There is also a need to understand how different ecological processes affect species richness and occurrence of coprophilous ascomycetes in general. The aim of this thesis was therefore to test earlier classifications of coprophilous tax

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8

Dupré, Cecilia. "Regional and local variation in plant species richness." Doctoral thesis, Uppsala universitet, Institutionen för evolutionsbiologi, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-691.

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In this thesis, I examine the variation in plant species richness along gradients of productivity and disturbance in grasslands and forest habitats in southern Sweden, and I compare the documented patterns with theoretical predictions. Moreover, I evaluate the relative importance of habitat quality and habitat configuration for the occurrence of field layer species in deciduous forests. Finally, I present a new method for the determination of the regional species pool. To examine regional and local variation in plant species richness, I gathered data on species composition in plots of differen

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Nyberg, Kruys Åsa. "Phylogenetic relationships and species richness of coprophilous ascomycetes /." Umeå : Univ, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-625.

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10

Dupré, Cecilia. "Regional and local variation in plant species richness /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5064-4/.

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11

Orme, Christopher David L'Estrange. "Body-size and macroevolutionary patterns of species richness." Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398022.

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12

Harral, Josephine Erica. "Experiments on resource availability and plant species richness." Thesis, Imperial College London, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415053.

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13

Steinmann, Katharina. "Testing basic assumptions of species richness hypotheses using plant species distribution data /." Zürich, 2008. http://opac.nebis.ch/cgi-bin/showAbstract.pl?sys=000254735.

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14

Giles, Mark. "Patterns of Species Rarity as a Driving Mechanism for Species Richness Gradients." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40587.

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Broad scale geographic variation in species diversity correlates with environmental variables in most taxa, but a mechanistic understanding of this relationship has remained elusive. More than a half-century ago, F.W. Preston observed that the number of individuals per species in species assemblages is log-normally distributed (with two parameters: the total number of individuals, I, and the number of individuals of the rarest species, m). Here, we show that ϕ, a proxy for m, is correlated with environmental variables in several datasets of trees, birds, fish, and invertebrates. Moreover, vari

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15

Steck, Claude Eugen. "Conservation of grasshopper species richness in a changing landscape." kostenfrei, 2007. http://e-collection.ethbib.ethz.ch/view/eth:29787.

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16

Nicolakakis, Nektaria. "Innovation rate, brain size and species richness in birds." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31280.

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The number of species varies greatly among taxa. In birds, for example, the parvorder Passerida contains 3556 species while the Odontophorida (New World Quails) contains only six species. This uneven distribution of species among avian taxa is not random and therefore warrants an explanation. The behavioral drive hypothesis stipulates that the capacity for innovation, coupled with the rapid transmission of the behavioral novelty to conspecifics, may expose individuals to new selective pressures and help fix mutations that would otherwise not be expressed. This should lead to accelerated rates

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17

Williams, Brandon M. "The influence of soil heterogeneity on plant species richness." Thesis, Wichita State University, 2013. http://hdl.handle.net/10057/10650.

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Environmental heterogeneity is often cited as one of the driving mechanisms behind community species composition and diversity. However, its contribution to species composition in plant communities remains unclear because few experiments demonstrate a causal link between environmental heterogeneity and plant diversity. This is particularly true for soil manipulations despite that fact that soil is expected to provide the key resources necessary for plant growth. Here, I utilize a unique manipulation of the soil profile to create communities with spatially heterogeneous and homogeneous soil arr

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18

Cardillo, Marcel. "The evolution of the latitudinal gradient in species richness /." St. Lucia, Qld, 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16383.pdf.

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19

Boucher-Lalonde, Véronique. "Predicting Broad-scale Patterns in Species Distributions." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34306.

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Species richness of virtually all high-level taxonomic groups is strongly statistically related to climatic variables such as temperature and precipitation, and consistently so across space and time. These observations are consistent with a causal link between the number of species that occur in a given region and its climate. Although dozens of hypotheses have been proposed, the main mechanisms underlying this pattern remain largely unresolved. And, few ecological studies have attempted to identify regularities in the individual species distributions that make up the richness–climate relation

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20

Wells, Emma Claire. "Seaweed species biodiversity on intertidal rocky seashores in the British Isles." Thesis, Heriot-Watt University, 2002. http://hdl.handle.net/10399/1178.

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21

Karns, Rachael Cassandra. "Microbial Community Richness Distinguishes Shark Species Microbiomes in South Florida." NSUWorks, 2017. http://nsuworks.nova.edu/occ_stuetd/453.

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The microbiome (microbial community) of individuals is crucial when characterizing and understanding processes that are required for organism function and survival. Microbial organisms, which make up an individual’s microbiome, can be linked to disease or function of the host organism. In humans, individuals differ substantially in their microbiome compositions in various areas of the body. The cause of much of the composition diversity is yet unexplained, however, it is speculated that habitat, diet, and early exposure to microbes could be altering the microbiomes of individuals (Human Microb

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22

White, Peter. "The effects of biotic and abiotic forces on species richness." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=104714.

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One central question in ecology is why some areas have many species and others have few. Many explanations have been proposed and often the forces that drive species richness are context-dependent. These forces are divided into two general categories: biotic drivers and abiotic drivers. Biotic drivers are most commonly described in terms as top-down and bottom-up effects while abiotic drivers are commonly described in terms of climate and habitat disturbance. The objective of this thesis is to determine how these drivers affect species richness in terrestrial ecosystems. To test this I examine

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23

Castellano, Jorge Aurora. "Species richness in riparian vegetation, a pilot study in Halmstad." Thesis, Högskolan i Halmstad, Miljövetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-27952.

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The riparian forests are hotspots of biodiversity and serve important roles in maintainingthe water quality. The study and understanding of this ecosystem is basic to know how theriparian zones respond to the threat and the changes produced by the urbanization. Theobjective of this pilot study was to know the species richness and check the status of theriparian vegetation along two different rivers in Halmstad, Nissan and Fylleån. The studywas focus on the status of trees at both rivers to see if the proximity of the city has anyimpact on the biodiversity. In total 9 different species were fou

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24

Payan, Garrido C. E. "Hunting sustainability, species richness and carnivore conservation in Colombian Amazonia." Thesis, University College London (University of London), 2009. http://discovery.ucl.ac.uk/18773/.

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Colombia embraces 7% of the Amazon basin, a worldwide conservation priority ecosystem, and most of it overlaps with indigenous territories. Some indigenous communities live inside protected areas and the impact of people in parks on biodiversity is uncertain. This work compares harvests measures hunting sustainability from indigenous people, prey species richness and carnivore density in a protected area and an unprotected area in Amazonia. Field data collection was collected for 14 months by recording hunting harvests from indigenous groups inside and outside Amacayacu National Park and camer

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25

Muller, Michael René. "Environmental correlates of avian species richness over southern Ontario, Canada." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/10250.

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Species richness is an ecologically important descriptor of ecosystems and, as a component of biodiversity, may be useful for conservation planning. Global and local patterns of richness have been related, with moderate success, to climatic and habitat parameters respectively. However our ability to predict species richness breaks down at intermediate scales (quadrats 10$\sp0$-10$\sp3$ km$\sp2$ in size extending over regions of 10$\sp3$-10$\sp6$ km$\sp2$). We examined the spatial variation in breeding bird species richness in 100 km$\sp2$ squares, across 200,000 km$\sp2$ of southern Ontario, a

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26

Stuart-Fox, Devi M. "Evolution of colour variation and species richness in agamid lizards /." St. Lucia, Qld, 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16809.pdf.

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27

Yu, Zequn [Verfasser], Jürgen [Akademischer Betreuer] Bauhus, and Michael [Akademischer Betreuer] Scherer-Lorenzen. "The influence of tree species richness on tree nutrition in a subtropical mixed-species experiment." Freiburg : Universität, 2019. http://d-nb.info/119003137X/34.

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28

Brüsin, Martin. "Influence of landscape scale and habitat distribution on individual bat species and bat species richness." Thesis, Linköpings universitet, Biologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-111400.

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Habitat fragmentation is one of the most important factors affecting species extinction and biodiversity loss, Species habitat response expects to differ with habitat feature at different spatial scales and this study was to identify how bat diversity and individual bat species respond to different habitat amounts. The local bat species richness was observed in 156 different locations in Östergötland and the proportion of different habitats were calculated for circular areas with diameters ranging from 400 m. to 12 km. from each location. Although we found that the individual bat species respo

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29

Bogardus, David C. "Comparison of tree species richness and species diversity in public landscapes of Broward County, Florida." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024623.

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30

De, Camargo Rafael Xavier. "Effects of Habitat Change on Bird Species Richness in Ontario, Canada." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/26258.

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It is generally assumed that when natural habitat is converted to human-dominated cover such area is “lost” to its native species. Extinctions will ensue. The literature generally assumes that species are extirpated as natural area is reduced, following the well-known species-area relationship (SAR). However, SARs have consistently over-estimated species losses resulting from conversion of natural habitat to human-dominated land covers. We hypothesize that the overestimation occurs because these area-based models assume that converted habitat is “lost”, eliminating all species. However, in the

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31

Beccaloni, George William. "Studies on the ecology and evolution of Neotropical ithomiine butterflies (Nymphalidae: Ithomiinae)." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307456.

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32

Tognelli, Marcelo Fabio. "Patterns of species richness and conservation of South American terrestrial mammals /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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33

Entling, Wiebke. "Macroecology of European spiders : habitat specialization, body size and species richness /." [S.l.] : [s.n.], 2008. http://www.zb.unibe.ch/download/eldiss/08entling_w.pdf.

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34

Dower, Katherine Mary. "Sand inundation on rocky shores : its effects on species richness and the structure of species assemblages." Thesis, Rhodes University, 1990. http://hdl.handle.net/10962/d1007183.

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Although sand deposits are present on many intertidal rocky shores, their effects on species richness, zonation and trophic structure have often been overlooked. This study is the first to recognise sand as an important abiotic factor on South African rocky shores. Rocky shores in the eastern Cape Province of South Africa are subject to extensive sand inundation and are composed of two hard substrata of differing topographies. Four sites on one substratum and six on the other were sampled quantitatively using quadrats. The biota were identified, counted and/ or weighed to provide a matrix of s

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35

Kretz, Lena. "The role of adjacent vegetation on the recovery of riparian flora : Effect of upstream and upland vascular vegetation after stream restoration in a boreal catchment." Thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-108082.

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Restoration of streams that were formerly channelized for timber-floating has become increasingly common. Generally, this restoration returns boulders from riparian zones to streams, leading to wider, more heterogeneous channels with slower flows. The primary goal is to enhance fish populations, but riparian vegetation is also expected to be favoured. However, increases in floristic diversity have not been observed and reasons for this slow response are still unknown. One possible explanation might be the lack of colonist pools. I therefore investigated how surrounding plant compositions influ

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36

Jezkova, Tereza, and John J. Wiens. "What Explains Patterns of Diversification and Richness among Animal Phyla?" UNIV CHICAGO PRESS, 2017. http://hdl.handle.net/10150/623200.

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Animal phyla vary dramatically in species richness (from one species to >1.2 million), but the causes of this variation remain largely unknown. Animals have also evolved striking variation in morphology and ecology, including sessile marine taxa lacking heads, eyes, limbs, and complex organs (e.g., sponges), parasitic worms (e.g., nematodes, platyhelminths), and taxa with eyes, skeletons, limbs, and complex organs that dominate terrestrial ecosystems (arthropods, chordates). Relating this remarkable variation in traits to the diversification and richness of animal phyla is a fundamental yet un

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37

Ödeen, Anders. "Effects of Post-Glacial Range Expansions and Population Bottlenecks on Species Richness." Doctoral thesis, Uppsala University, Department of Evolutionary Biology, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1426.

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<p>This thesis relates modern speciation theory to the effects of sudden changes in the range and size of populations. Special reference is made to the climatic oscillations during the Quaternary ice ages. A meta-analysis of laboratory experiments showed that support for allopatric speciation is weak, especially for the peripatric type of allopatric speciation. Furthermore, factors traditionally believed to increase the likelihood of speciation have had little effect on the generation of reproductive isolation in speciation experiments. However, the method of testing reproductive isolation app

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38

Wesheu, Irene Catherine. "Species richness - standing crop relationships on an infertile shoreline in Nova Scotia." Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5200.

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39

Blocksome, Carolyn E. "Sericea lespedeza (Lespedeza cuneata) : seed dispersal, monitoring, and effect on species richness." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/192.

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40

Ödeen, Anders. "Effects of post-glacial range expansions and population bottlenecks on species richness /." Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2001. http://publications.uu.se/theses/91-554-5140-3/.

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41

Hopton, Matthew E. "Relationship Between Environmental Heterogeneity and Patterns of Species Richness of Terrestrial Vertebrates." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1139689520.

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42

Dyer, E. "A global study of the distribution and richness of alien bird species." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1475851/.

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Alien species are a major component of human-induced environmental change, yet spatial and temporal variation in the drivers of their introduction, and their subsequent distribution and richness, are poorly understood. Here, I present a global analysis of the drivers of this variation for a major animal group, birds (Class Aves), using the newly-created Global Avian Invasions Atlas (GAVIA) database. GAVIA includes information on introduction successes and failures, enabling me to examine the effect of colonisation pressure (the number of species introduced) on alien bird distributions. A descr

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43

Henriksson, Anna. "Biotic resistance in freshwater fish communities." Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-110251.

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Invasions of non-native species cause problems in ecosystems worldwide, and despite the extensive effort that has been put into research about invasions, we still lack a good understanding for why some, but not other, communities resist these invasions. In this doctoral thesis I test hypotheses on biotic resistance using a large dataset of more than 1000 both failed and successful introductions of freshwater fish into Swedish lakes. We have found that the classic species richness hypothesis is a poor descriptor of introduction success because it fails to acknowledge that resident species contr

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44

Pender, Jocelyn E. "Climatic Niche Estimation, Trait Evolution and Species Richness in North American Carex (Cyperaceae)." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34334.

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With close to 2100 species, the flowering plant genus Carex (Cyperaceae; sedges) is an example of an evolutionary radiation. Despite its potential for use as a model taxon in evolutionary studies, the diversification of sedges remains largely unexplored. This thesis realizes the potential of Carex as an evolutionary model group by using it to ask questions about species richness patterns. More specifically, it seeks to determine the relationship, if any, between rates of trait evolution and species richness. This tests the hypothesis that organisms with increased abilities to evolve new traits

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45

Nielsen, Uffe Nygaard. "Influences on species richness and composition of belowground communities at multiple spatial scales." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2008. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=24811.

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46

Hoare, David Barry. "Patterns and determinants of species richness in mesic temparate grasslands of South Africa." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/1275.

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The aim of this study is to gain a predictive understanding of the patterns and determinants of plant biodiversity in temperate, mesic grasslands of South Africa with a primary focus on the geographical area of the Eastern Cape. From a review of the literature on hypotheses explaining diversity (Chapter 2) it was possible to formulate a number of hypotheses that could be tested to explain species richness patterns in Eastern Cape grasslands. This thesis is organised so that each main chapter deals with a specific body of theory concerning the explanation of diversity patterns. A detailed descr

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47

Van, Tonder Carlo. "Factors influencing species richness, cover and composition of vegetation on Namaqualand quartz fields." Thesis, Nelson Mandela Metropolitan University, 2006. http://hdl.handle.net/10948/630.

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Quartz fields contribute significantly to plant diversity in the Succulent Karoo biome. They are distinctly different from surrounding habitats and have high levels of plant endemism. Biological soil crusts are features of quartz field soils and fulfill a vital function in that they stabilize soils. It is important for managers of nature reserves and agricultural rangelands to know what factors influence quartz field soils and vegetation. Both stakeholders could benefit from new information that would allow for informed decision-making regarding land-use on quartz fields. The present study too

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48

Jobe, R. Todd White P. S. "Biodiversity and scale determinants of species richness in Great Smoky Mountains National Park /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2006. http://dc.lib.unc.edu/u?/etd,398.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2006.<br>Title from electronic title page (viewed Oct. 10, 2007). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Curriculum of Ecology." Discipline: Ecology; Department/School: Ecology.

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49

Boag, Angela Elaine. "Spatial models of plant species richness for British Columbia's Garry oak meadow ecosystem." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46920.

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Garry oak meadow ecosystems in British Columbia are fragmented, increasingly degraded, and have been prioritized for conservation. While distribution maps of remnant meadow patches have been developed, the ecological integrity of plant communities in many of these remnants remains unknown. Modeling and mapping ecological integrity could inform conservation prioritization exercises in the region. The primary goal of this thesis was to develop distribution models of native and exotic plant species richness in Garry oak meadow remnants. Secondly, multiple independent datasets were used to

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50

Scholes, Lianna. "The response of species richness to manipulations of energy supply in protist microcosms." Thesis, University of Sheffield, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421224.

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