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Dissertations / Theses on the topic 'Endemic and relict species'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Gissi, Danilo Soares. "Phylogeny of Phlegmariurus (Lycopodiaceae) focusing on Brazilian endemic species." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/41/41132/tde-18052017-150806/.

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Phlegmariurus is the most abundant genus of Lycopodiaceae in Brazil with 40 species, 24 of which are endemic, occurring mainly in the Atlantic Rainforest and Rocky Fields (“Campos Rupestres”) in the Espinhaço range. Some phylogeny works with the group had already been carried out, but not including a representative sample of the Brazilian species. Thus, we performed a molecular phylogeny of Phlegmariurus species endemic in Brazil using three molecular markers of cpDNA. Phlegmariurus showed to be monophyletic, including two clades, one Neotropical and another Paleotropical. All the

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2

Matimele, Hermenegildo Alfredo. "An assessment of the distribution and conservation status of endemic and near endemic plant species in Maputaland." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/20995.

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The Maputaland Centre of Endemism (MCE), an area stretching from northern-east KwaZulu-Natal in South Africa to the Limpopo River in southern Mozambique, holds more than 2,500 native plant species. Of those, over 203 are endemic or near endemic to this area. However, the current high human population density in MCE, coupled with high population growth, has increased the pressure on the natural resources of the region and threatens the natural vegetation and plant diversity. Therefore, there is a pressing need to fully understand the threats faced by the Maputaland endemic and near endemic plan

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3

Gwinn, R. Nathan, and John L. Koprowski. "Differential response to fire by an introduced and an endemic species complicates endangered species conservation." ASSOC TERIOLOGICA ITALIANA, 2016. http://hdl.handle.net/10150/625219.

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Fire is a natural component of, and serves as a tool for, the restoration of forested ecosystems worldwide; however, disturbance due to fire also has been implicated in the proliferation of invasive species. How these fires affect occupancy and use of the forest by wildlife is of great concern, in particular, the differential response of non-native and native species. In the North American Southwest, prior to European settlement, frequent wildfires helped to maintain forest structure. We examined the effect of a large wildfire on an introduced population of the Abert's squirrel (Sciurus aberti

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4

Albarih, Sami. "Germination responses of endemic land-races of Saudi-Arabian cereal species." Thesis, University of East Anglia, 2014. https://ueaeprints.uea.ac.uk/52154/.

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This investigation of endemic land-races of Saudi-Arabian cereals, Triticum aestivum, Triticum durum, Hordeum vulgare, Panicum miliaceum and Pennisetum glaucum was aimed at identifying and characterizing stress-tolerant populations appropriate for germplasm-banking. Native soils were saline, nutrient-poor, sandy and subject to seasonal drought and hot summers. Consequently, the work focused on responses of germination and early growth to salinity (0-1000 mM NaCl) and high temperatures, using mainly thermogradient plates and incubators. I examined germination rate, enforced dormancy and viabili

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PORCEDDU, MARCO. "Germination niche of Sardinian endemic species in mountain riparian deciduous forests." Doctoral thesis, Università degli Studi di Cagliari, 2014. http://hdl.handle.net/11584/266409.

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The Supramontes region and Gennargentu massif are two of the most interesting territories of Central Eastern Northern Sardinia. Riparian vegetation among mountainous waterways of these territories are mainly constituted by Alnus glutinosa with other associated taxa such as Taxus baccata, Ilex aquifolium and Rhamnus persicifolia. Rare and threatened Sardinian endemic species such as Ribes multiflorum subsp. sandalioticum, Aquilegia barbaricina, Rhamnus persicifolia and Paeonia corsica grow under and close to the canopy of such riparian woods. Temperature is considered one of the major envir

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6

Lewendon, Sarah. "Self-incompatibility in Cosmos atrosanauineus : a rare Mexican endemic species of Asteraceae." Thesis, University of Greenwich, 2005. http://gala.gre.ac.uk/6225/.

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This work centres on Cosmos atrosanguineus, a rare Mexican endemic self-incompatible species of Asteraceae that is now believed to be extinct in the wild. The two known wild C. atrosanguineus collections, made in made in the 19th century, localise the species to the pine-oak mountain forest ecological region in two areas of central Mexico. Its disappearance from the natural environment is attributed to habitat destruction by the copper mining industry and subsequent urbanisation, so that C. atrosanguineus is now known only as a cultivated species. European and American C. atrosanguineus popula

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7

Wennerberg, Sarah B. "Propagation and field assessment of West Virginia native species for roadside revegetation." Morgantown, W. Va. : [West Virginia University Libraries], 2005. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4157.

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Thesis (M.S.)--West Virginia University, 2005.<br>Title from document title page. Document formatted into pages; contains vii, 65 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references.

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8

SADEK, MOHAMED ABDELAAL LOTFY. "The endemic vascular plant species of Egypt: distribution patterns and implications for conservation." Doctoral thesis, Università degli Studi di Cagliari, 2020. http://hdl.handle.net/11584/285247.

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Taxa endemic to a country are the most valuable component of flora and deserve high regional and global conservation priorities. Due to their restricted distribution, endemic taxa may be intrinsically threatened and are therefore highly important in the local prioritization of conservation efforts. In Egypt, the number of exclusive endemic vascular plants, their distribution pattern and conservation assessment are out of date or unknown. The aims of this research project were (1) to build an updated checklist of the endemic vascular flora of Egypt, (2) to evaluate possible species shift accord

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9

Ainsworth, Alison. "Interactive influences of wildfire and nonnative species on plant community succession in Hawaii Volcanoes National Park /." Connect to this title online, 2007. http://hdl.handle.net/1957/4504.

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10

Telli, Murat. "The Relationship Between Genetic And Shape Variation In Endemic And Endangered Freshwater Fish Species Pseudophoxinus." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12610125/index.pdf.

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Evolutionary models addressing interaction between genetics and morphology propose that during development, morphological traits of organisms are under canalization selection resulting in constancy in morphology through evolutionary time. The hypothesis of genetic homeostasis predict that because of developmental buffering effects of heterosis, high level heterozygosity results in low level of morphological variance from the norms of canalized shape of the population. The aim of the present study is to test whether the variation in shape of organisms is negatively correlated with genetic varia

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11

Rehage, Jennifer Schopf. "TRAITS UNDERLYING INVASIVENESS: A COMPARISON OF WIDESPREAD AND ENDEMIC SPECIES IN THE GENUS GAMBUSIA (POECILIIDAE)." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_diss/262.

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Due to the irreversible nature of biological invasions, prediction has been a key area of emphasis in invasion biology. Specifically, the degree to which species-specific traits may help us predict invasion success is a core issue in the field. My research examined a series of traits and asked whether they were good predictors of invasion success, particularly establishment success. I compared traits among four species of the poeciliid fish Gambusia, two of them highly invasive (G. affinis and G. holbrooki) and two of them non-invasive (G. hispaniolae and G. geiseri).I examined abiotic toleran

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12

Lima, Ricardo Faustino de. "Land-use management and the conversation of endemic species in the island of São Tomé." Thesis, Lancaster University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.660114.

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Habitat destruction is the single biggest threat to biodiversity. Despite significant research efforts, the response of biodiversity to human activities remains difficult to' predict. This thesis analyses the responses of bird and tree assemblages to land-use intensification on the island of Sao Tome (Democratic Republic of Sao Tome and Principe), focusing on the endemic species. Global research effort on island endemic birds is very biased; over half of the research is concentrated in less than 5% of the species. Although Sao Tome has received very little research, many other endemic-rich isl

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13

Rehage, Jennifer Schöpf. "Traits underlying invasiveness a comparison of widespread and endemic species in the genus gambusia (poeciliidae) /." Lexington, Ky. : [University of Kentucky Libraries], 2003. http://lib.uky.edu/ETD/ukybiol2003d000107/JSRdiss.pdf.

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Thesis (Ph. D.)--University of Kentucky, 2003.<br>Title from document title page (viewed June 1, 2004). Document formatted into pages; contains x,143 : ill. Includes abstract and vita. Includes bibliographical references (p. 125-141).

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14

Brucker, Kaitlyn M. "An Endemic Commensal Leucothoid Discovered in the Tunicate Cnemidocarpa bicornuta, from New Zealand (Crustacea, Amphipoda)." NSUWorks, 2016. http://nsuworks.nova.edu/occ_stuetd/407.

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Precise descriptions and comprehensive taxonomies of species and their ecology are essential in monitoring changes in marine biodiversity at multiple spatial scales. A currently undescribed species of commensal amphipod in the genus Leucothoe is reported from New Zealand, collected from the endemic tunicate Cnemidocarpa bicornuta. This species differs from others in the genus in having a one-articulate first maxilla palp and an apically produced tuberculate lobe on the inner margin of the outer plate of the maxilliped. Previous taxonomic surveys in New Zealand waters did not document this spec

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15

Valles, Carlos Mariano Alvez. "Biogeography and conservation of Amazon palms." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/6607.

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Hamston, Tracey Jane. "Evolutionary relationships and reproductive ecology of endemic Sorbus species in south west UK : implications for conservation." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/26715.

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The genus Sorbus is an example of a taxonomically complex group (TCG) with diversity derived from hybridisation, polyploidy and apomixis. The focus of this study was to elucidate the evolutionary relationships among nine Sorbus species including endemics of the Devon and north Somerset region of the south west UK, determine main routes of polyploid formation and investigate reproductive sustainability in order to make recommendations for Sorbus conservation. Molecular analysis showed that genetic structure patterns and genotypic diversity support the hypothesis that the study polyploids are a

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17

Yeld, Eleanor Margaret. "Parasite assemblages of three endemic catshark species from the west and south coasts of South Africa." Doctoral thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/12150.

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Includes abstract.<br>Includes bibliographical references (leaves 157-175).<br>This study focused on the parasite assemblages of three catshark (Elasmobranchii: Scyliorhinidae) species: the dark shyshark, Haploblepharus pictus, the puffadder shyshark, H. edwardsii and the pyjama shark, Poroderma africanum, all endemic to Southern Africa. These sharks are found from Namibia to Agulhas (H. pictus), Cape Point to Northern KwaZulu-Natal (H. edwardsii) and St Helena Bay to KwaZulu-Natal (P. africanum), and reach maximum total lengths of 60, 60 and 105 cm respectively. Sharks were collected by SCUBA

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18

Lin, Wuying. "Comparative Reproductive Biology of a Rare Endemic Orchid and its Sympatric Congeners in Southwestern China." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/570.

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Comparative studies on endangered species and their more common congeners can shed light on the mechanism of species rarity, and enable conservationists to formulate effective management strategies. I compared the breeding and pollination systems of the endangered Geodorum eulophioides and its two more common sympatric congeners in subtropical China. Geodorum eulophioides and G. recurvum were self-compatible, both depending on Ceratina cognata for fruit production, while G. densiflorum can autonomously self. Although the floral visitation frequency of G. eulophioides was the highest among the

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19

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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20

Buick, Devin P. "The Rise and Fall of the Cucullaeidae: Exploring Transitions in Species Richness, Geographic Range, Morphology and Ecology in a Relict Bivalve Family." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1275654678.

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21

Juan, Vicedo Jorge. "In vitro propagation and ex situ conservation of the Western-Mediterranean endemic species Lapiedra martinezii Lag. (Amaryllidaceae)." Doctoral thesis, Universidad de Alicante, 2016. http://hdl.handle.net/10045/70217.

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22

Ofisi, Mbulelo. "In vitro propagation studies of rare Argyroderma species strictly endemic to the Knersvlakte region of South Africa." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2714.

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Thesis (MTech (Horticulture)--Cape Peninsula University of Technology, 2017.<br>A study was conducted to investigate the effects of various media composition and wounding treating on the in vitro propagation of Argyroderma subalbum and A. testiculare explants derived from mature plants, antioxidants and plant growth regulators (PGR) concentrations. One experiment consisted of 3 medium types including Murashige and Skoog (MS) medium strength, vitamin supplement. Fifteen replicates were used for each treatment. The shoots were then sub-cultured to ten replicate regenerated medium consisting of v

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23

Rossington, Natalie L. "How are rare species maintained?: Reproductive barriers between Layia jonesii, a rare serpentine endemic, and L. platyglossa." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1494.

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Reproductive barriers are vital to generating new species as well as maintaining distinct species. Investigating reproductive barriers between closely related plant taxa helps us to understand how these barriers are maintained, particularly between rare and widespread relatives. Layia jonesii, a rare San Luis Obispo County serpentine endemic, and L. platyglossa, a common coastal species, co-occur on serpentine derived hillsides and are interfertile. At these locations, L. jonesii is isolated to dry soils near serpentine rock outcrops and L. platyglossa is located on slightly deeper grassland s

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Zuiddam, Sharon Angela. "A revision of the Western Australian species of the Australian harvestman genus Nunciella (Opiliones: Triaenonychidae)." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2015. https://ro.ecu.edu.au/theses/1636.

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Many regions around the world are renowned as biodiversity hotspots. South Western Australia is one of these. A combination of the recognised high biodiversity and a seemingly unbalanced species distribution of the genus Nunciella across Australia initiated the investigation into the diversity of the south western species of Nunciella. Previous descriptions indicate two of the 11 Nunciella species are found in this region, one of these with a very large recorded distribution in contradiction to the short range distribution of all the other species. Through observations of museum specimens it i

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25

Griffiths, Alistair James Kenneth. "The ex-situ conservation of endemic Seychelles plant species : Impatiens gordonii Horne ex Baker as a case study." Thesis, University of Reading, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.494979.

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The role of ex-situ conservation in the species recovery plan for Impatiens gordonii was evaluated. Phylogenetic analyses including seven new sequences and published data for I. gordonii and its congeners showed the East African species I. usambarensis is sister to I. gordonii, with I. waileriana sister to that species pair. Nine herbarium samples and 18 live plants of /. usambarensis, I. waileriana, I. gordonii and I. thomassetii were scoored for 21 morphometric characters.

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Lecis, Roberta. "Field and molecular ecology of the endemic Sardinian mountain newt Euproctus platycephalus : conservation of a critically endangered species." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394457.

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27

Harrod, Richy J. "Demography and disturbance ecology of Iliamna longisepala and Trifolium thompsonii, two endemic species of the Wenatchee Mountains, Washington /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/5594.

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28

Hamilton, Martin Allen. "Boraginaceae Varronia rupicola (Urb.) Britton : biogeography, systematic placement and conservation genetics of a threatened species endemic to the Caribbean." Thesis, Birkbeck (University of London), 2016. http://bbktheses.da.ulcc.ac.uk/179/.

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In the Caribbean region, Varronia rupicola (Boraginaceae) is a medium to large, woody shrub endemic to the Puerto Rican Bank where it is threatened with extinction due to its limited area of occupancy, small populations and on-going threats. The greatest of these is currently loss of suitable habitat through development and degradation. These are caused by human activities that are expected to continue and possibly worsen. The species is also threatened by sea level rise and drought as well as natural disasters, particularly hurricanes and tsunamis. Combined, the effects of anthropogenic and c

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Seidel, Sara Elizabeth. "Exploring the Spawning Dynamics and Identifying Limitations to the Early Life-History Survival of an Important, Endemic Fish Species." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/387.

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For many native, imperiled salmonid species, the prioritization of recovery and conservation efforts hinges upon the identification of a species most limiting life stage. The early life-history stage can be a limiting life stage for fish, and given the importance of the reproductive stage to overall persistence, there is a need to better understand the spawning ecology and early life history of many salmonids. The Logan River, in northern Utah, contains one of the largest metapopulations of imperiled Bonneville cutthroat trout (BCT) throughout the Bonneville Basin. Little research has evalua

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Rycken, Sam Johan Eduard. "Movement ecology of the three species of threatened black cockatoo (Calyptorhynchus latirostris, Calyptorhynchus baudinii, Calyptorhynchus banksii naso) endemic to Western Australia: Implications for the species’ conservation management." Thesis, Rycken, Sam Johan Eduard (2019) Movement ecology of the three species of threatened black cockatoo (Calyptorhynchus latirostris, Calyptorhynchus baudinii, Calyptorhynchus banksii naso) endemic to Western Australia: Implications for the species’ conservation management. PhD thesis, Murdoch University, 2019. https://researchrepository.murdoch.edu.au/id/eprint/55805/.

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Historically it has been difficult to gain information on the movement ecology of psittacine species in Australia. Using a novel double-tagging telemetry method, this research, aimed to: investigate regional differences in movement of the three black cockatoo species endemic to Western Australia; identify key roost and foraging sites for these species across regions; and estimate home range sizes for flocks in resident areas, using a combination of GPS and satellite PTT tags. Tagged birds served as markers of flock movement once integrated into a wild flock of conspecifics, which was confi

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Ayers, Scott David. "A review of the species status of the Angayukaksurak charr (Salvelinus anaktuvukensis) of northern Alaska perspectives from molecular and morphological data /." PURL, 2010. http://www.arlis.org/docs/vol1/B/608729840.pdf.

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Silva, Elsa Susana de Sousa Dimas. "Contributo para a caracterização das sementes das espécies endémicas lenhosas dos Açores: Picconia azorica, Prunus azorica, Juniperus brevifolia e Vaccinium cylindraceum." Master's thesis, ISA/UL, 2014. http://hdl.handle.net/10400.5/8227.

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Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia<br>The present work was organized into two sections: the first one assemble all existing information regarding the characterization of four endemic species of the Azores and their propagation techniques; the second presents the results obtained in 2007 and 2012 / 2013 concerning the morphological characterization of the batch of fruit and seeds of these species and their physiological characterization, regarding seed lots’ viability and its germination capacity. It was also tested some techniques to

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Xenophontos, Marina. "Ecology of the endemic migratory passerine Cyprus Wheatear Oenanthe cypriaca : the effects of climate change on a restricted range species." Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/11967.

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Migrant birds may be vulnerable to climate change at different stages of their annual cycles especially on the breeding grounds, where changes in phenology may affect their ability to synchronise breeding with the peak of resources availability. Understanding how phenology of breeding, survival and productivity varies between and within years is therefore crucial to understand migrant population dynamics. This thesis describes this variation in the Cyprus Wheatear Oenanthe cypriaca, with particular emphasis on a colour-ringed population at Troodos, Cyprus, 2010-2012. Our results suggest that t

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Róis, Ana Sofia da Silva Valbordo. "Strategies for conservation of rare and endemic species: characterization of genetic and epigenetic variation and unusual reproductive biology of coastal species from Limonium ovalifolium and Limonium binervosum complexes (Plumbaginaceae)." Doctoral thesis, ISA/UL, 2014. http://hdl.handle.net/10400.5/7352.

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Doutoramento em Biologia - Instituto Superior de Agronomia<br>Limonium Mill. (Plumbaginaceae) is among the best represented genus in coastal habitats. In Continental Portugal, two taxonomically complex groups, diploid Limonium ovalifolium and tetraploid Limonium binervosum complexes are present, and species within these complexes present morphological similarities. These species are threatened as a result of negative anthropic impacts in coastal areas. The aims of the study presented in here were to collect information on chorology, karyology, natural population genetic and epigenetic variati

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Kilroy, Catherine. "Diatom communities in New Zealand subalpine mire pools: distribution, ecology and taxonomy of endemic and cosmopolitan taxa." Thesis, University of Canterbury. Biological Sciences, 2007. http://hdl.handle.net/10092/3678.

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Mire pools – shallow water-bodies in peat-forming wetlands – are a characteristic feature of New Zealand’s subalpine and alpine landscapes (>1000 m a.s.l.), yet have been the subject of few biological studies to date, particularly of their algal communities. This research focuses on these subalpine systems, and on their diatom communities. Despite the established paradigm of ubiquitous dispersal in micro-organisms, recent taxonomic studies have confirmed a distinctive endemic component in the freshwater diatom flora of the New Zealand / Tasmania / East Australian region. In this study, I exami

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Githiru, Mwangi. "Endemic forest birds of the Taita Hills : using a model species to understand the effects of habitat fragmentation on small populations." Thesis, University of Oxford, 2002. http://ora.ox.ac.uk/objects/uuid:b532599f-8f75-4a11-95d5-61a5afee1fca.

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Despite intense publicity, habitat loss still remains a serious threat to biodiversity. Forest destruction is its frontrunner, both in terms of physical habitat under threat and potential for biodiversity loss. In the fragmented landscape of the Taita Hills, SE Kenya, several bird species are facing the threat of extinction from forest loss. They are absent from many of the remnant forest patches and/or are showing negative effects with increasing disturbance. Using a relatively common forest-dependent bird species - the whitestarred robin Pogonocichla stellata - as a model, the current status

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Duncan, Murray. "The genetic stock structure and distribution of Chrysoblephus Puniceus, a commercially important transboundary linefish species, endemic to the South West Indian Ocean." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1011868.

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Chrysoblephus puniceus is an over-exploited linefish species, endemic to the coastlines off southern Mozambique and eastern South Africa. Over-exploitation and habitat loss are two of the biggest threats to the sustainability of fisheries globally. Assessing the genetic stock structure (a prerequisite for effective management) and predicting climate related range changes will provide a better understanding of these threats to C. puniceus which can be used to improve the sustainability of the fishery. Two hundred and eighty four genetic samples were collected from eight sampling sites between P

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Beton, Damla. "Effects Of Climate Change On Biodiversity: A Case Study On Four Plant Species Using Distribution Models." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613538/index.pdf.

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Conservation strategies are mainly focused on species existing in an environment shaped by natural and anthropogenic pressures. Yet, evidence shows that climate is changing faster than ever and expected to continue to change in the near future, which can be devastating for plants with restricted ranges. Turkey harbors many endemic species that might be affected from these changes. However, available data is scarce and biased, complicating the anticipation of future changes. Aim of this study is to improve our understanding of endemic species distributions and forecasting effects of climate ch

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Zuloaga, Villamizar Juan Gerardo. "Species Endemism: Predicting Broad-Scale Patterns and Conservation Priorities." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37149.

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Do thermal barriers limit biotic composition and community similarity, potentially helping to shape biodiversity patterns at continental scales? Are environmental variables responsible for broad-scale patterns of species endemism? Are these patterns predictable? And, how can patterns of endemism can inform global conservation strategies? These are some of the questions that I attempted to answer during my doctoral research. In the first chapter, I tested one of the most contentious hypotheses in ecology: Do thermal barriers, which grow stronger along elevational gradients across tropical moun

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NUCCI, ALESSIA. "Distribution patterns of riparian plant species across river of Sardinia and Tuscany." Doctoral thesis, Università degli Studi di Cagliari, 2011. http://hdl.handle.net/11584/266292.

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This research project aims to analyze riparian vascular flora of four Mediterranean rivers belonging to two different regions (Sardinia and Tuscany). It focuses on the analysis of floristic differences, on distributional trends of functional and ecological groups, alien and endemic species, and also on the application of landscape classifications to be used as surrogate in conservation planning. The main goal is to evaluate similarities and differences among these rivers in the frame of a regional scale approach of study, thus contributing to improve the knowledge about their internal dy

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Jaca, Estepa Julia. "Opportunistic Vertebrates as Mediators of the Reproductive Success of two Canarian Endemic Plants." Doctoral thesis, TDX (Tesis Doctorals en Xarxa), 2020. http://hdl.handle.net/10803/671456.

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[eng] Plant reproductive success depends on the effectiveness of the mutualistic interaction and the context in which it occurs. This thesis investigates and quantifies plant fitness with a particular group of animal mutualists, opportunistic vertebrates, in the context of oceanic islands. Compared to mainland systems, oceanic islands are generally characterized by simpler mutualistic networks, largely as a result of depauperate animal faunas. Because of this, plant species are likely to include new, even novel flower–pollinator and fruit-dispersal interactions after island colonization. In th

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MACRI', CARMELO NICODEMO. "Adaptations of plant species to environmental changes." Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1003150.

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The future climate change represents the biggest challenge for plant and animal species. The scenarios forecasted by the IPCC predict a global increase in temperatures and regional changes in rainfall during this century. Therefore, studying the relationship between climate and several traits of species is crucial in our understanding of the effects that future changes may have on plants. Species growing along a wide environmental gradient are a suitable study model to verify the relationship between intraspecific variability and both current and future climate. The aim of my PhD project is to

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Lunghi, Enrico [Verfasser], and Michael [Akademischer Betreuer] Veith. "Improving the knowledge of European cave salamanders (genus Hydromantes):ecological studies for conservation of a highly threatened endemic species / Enrico Lunghi ; Betreuer: Michael Veith." Trier : Universität Trier, 2018. http://d-nb.info/1197807772/34.

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Swarts, Hilary MacRae. "The behavioral response of an endemic, endangered species to novel predation| The Santa Cruz Island fox (Urocyon littoralis santacruzae) and the golden eagle (Aquila chrysaetos)." Thesis, University of California, Davis, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3565405.

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<p> Abstract As invasive predators spread across landscapes, their sudden presence may have significant effects on the behavior patterns of their new found prey. Here, I examined how predator-naive foxes responded to colonization by non-native golden eagles on Santa Cruz Island, California. First, using radio-telemetry, I investigated the effects of this diurnal, aerial predator on fox activity patterns. In 1992, just prior to the arrival of golden eagles, foxes showed substantial diurnal activity, but diurnal activity was 37.0% lower in 2003-7, after golden eagle colonization; concurrentl

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Yadav, Sunita. "The Influence of Climate and Topography in Modeling Distributions for Species with Restricted Ranges: A Case Study Using the Hawaiian Endemic Plant Genus, Schiedea (Caryophyllaceae)." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1447690823.

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Francis, Matthew D. "Interspecific Competition Between Hygrophila polysperma and Ludwigia repens, Two Species of Importance in the Comal River, Texas." Thesis, University of North Texas, 1999. https://digital.library.unt.edu/ark:/67531/metadc278133/.

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Hygrophila polysperma is a plant native to Asia that has been introduced into the Comal River, TX and is thriving while Ludwigia repens, a species native to the river appears to be declining. Both plants have similar morphologies and occupy similar habitats in the river. Two plant competition experiments were conducted to examine the competitive interactions between the two species. First, an experimental design was developed in which established Ludwigia plants were 'invaded' by sprigs of Hygrophila to determine if established Ludwigia populations would be negatively impacted by invasion. The

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Zumwalde, Bethany A. "A Systematic Revision of the Viola pedatifida>/i> Group and Evidence for the Recognition of Viola virginiana, a New Narrow Endemic of the Virginia Shale Barrens." Ohio University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1438787005.

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Seidel, Richard Alan. "Conservation Biology of the Gammarus pecos Species Complex: Ecological Patterns across Aquatic Habitats in an Arid Ecosystem." Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1251472290.

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Brown, Catherine. "The phylogeography, biomass allocation and phenology of Salicornia tegetaria (S. Steffen, Mucina & G. Kadereit) Piirainen & G. Kadereit, an endemic salt marsh species in South Africa." University of the Western Cape, 2018. http://hdl.handle.net/11394/6248.

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Magister Scientiae (Biodiversity and Conservation Biology) - MSc (Biodiv & Cons Biol)<br>Salicornia tegetaria is an endemic salt marsh macrophyte that is widely distributed in estuaries along the South African coast. The aims of the study were to understand the phylogeography of the species, compare the biomass allocation in two regions and to determine phenological patterns of S. tegetaria between the warm and cool temperate biogeographical regions. The phylogeography of S. tegetaria was studied using the noncoding chloroplast DNA region rpS16 and nuclear rDNA ITS region. Five samples each we

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Brown, Catherine Eileen. "The phylogeography, biomass allocation and phenology of Salicornia tegetaria (S. Steffen, Mucina & G. Kadereit) Piirainen & G. Kadereit, an endemic salt marsh species in South Africa." University of the Western Cape, 2018. http://hdl.handle.net/11394/6391.

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Magister Scientiae (Biodiversity and Conservation Biology) - MSc (Biodiv & Cons Biol)<br>Salicornia tegetaria is an endemic salt marsh macrophyte that is widely distributed in estuaries along the South African coast. The aims of the study were to understand the phylogeography of the species, compare the biomass allocation in two regions and to determine phenological patterns of S. tegetaria between the warm and cool temperate biogeographical regions. The phylogeography of S. tegetaria was studied using the noncoding chloroplast DNA region rpS16 and nuclear rDNA ITS region. Five samples each we

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