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Tesis sobre el tema "Ecologic variability"

Autor: Grafiati
Publicado: 11 de marzo de 2023

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1

Billard, Elodie. "Etude des communautés microbiennes fonctionnelles benthiques impliquées dans le cycle du méthane (Lac du Bourget)." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAA017/document.

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Les communautés microbiennes benthiques participent activement au recyclage de la matière organique et de fait au fonctionnement biogéochimique des écosystèmes lacustres. Ces communautés comportent de nombreux phyla mais leur diversité fonctionnelle est encore incomplètement connue. Ce travail vise à appréhender les modifications de structure et d'abondance des gènes fonctionnels en lien avec la distribution spatiale verticale (liée au gradient d'oxydoréduction), la variabilité spatiale horizontale (zone côtière vs pélagique) et la dynamique saisonnière liée au brassage de la colonne d'eau (ré
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2

Afán, Asencio Isabel. "Ecological response of marine predators to environmental heterogeneity and spatio-temporal variability in resource availability." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/398990.

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Seabirds have evolved within an open and dynamic environment, the ocean. As meso-top predators, seabirds are greatly influenced by the oceanographic conditions driving marine productivity, and therefore, distribution of their prey. Consequently, seabirds’ behaviour and, ultimately, life-history traits are greatly influenced, by the ever-changing oceanographic conditions. However, oceanographic conditions are currently changing at ever-increasing rates due to global warming and human harvest impacting marine ecosystems. Thus, seabirds have become particularly vulnerable to these changes. Accord
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3

Alegre, Norza Sior Ana Renza Paola. "Trophic ecology of jumbo squid and predatory fishes in the Northern Humboldt Current System." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS223/document.

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Ce travail est une contribution à l'étude de l'écologie trophique d'importants prédateurs de la partie Nord du système du Courant de Humboldt (NSCH), le chinchard (Trachurus murphyi), le maquereau (Scomber japonicus) et le calmar géant (Dosidicus gigas). Nous avons caractérisé la variabilité des modes d'alimentation de ces espèces à différentes échelles spatiotemporelles et fourni de nouvelles connaissances sur le comportement alimentaire de ces espèces, définies comme opportunistes par des travaux antérieurs. Pour ce faire, nous avons appliqué une variété de méthodes statistiques à un vaste j
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4

Kosanic, Aleksandra. "Ecological responses to climate variability in west Cornwall." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/18120.

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Recent (post-1950s) climate change impacts on society and ecosystems have been recognised globally. However these global impacts are not uniform at regional or local scales. Despite research progress on such scales there are still gaps in the knowledge as to 'what' is happening and 'where'? The goal of this study addresses some of these gaps by analysing climate variability and vegetation response at the furthest south westerly peninsula of the United Kingdom. This research is focused on West Cornwall (South West England) - an area dominated by a strong maritime influence. The first part of th
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5

Alexandre, Carlos Manuel Engeitado. "Ecological impact of streamflow variability in the bio-ecology of freshwater fishes from permanent and temporary mediterranean river systems." Doctoral thesis, Universidade de Évora, 2014. http://hdl.handle.net/10174/14671.

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Natural streamflow variability is important for riverine ecosystems but river regulation modifies flow patterns, disturbing fish bio-ecology. This thesis includes a characterization of basal biological differences between non-regulated permanent and temporary Mediterranean rivers and analyzes the effects of three types of regulation on fish assemblage composition, movement, diet and life-history. Fish from non-regulated permanent rivers had higher swimming performance, a higher percentage of invertebrates in their diet, mature at an older age, later in the year and have higher growth rates. By
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6

Joyce, Andrew Noel. "Modelling surface climate over complex terrain for landscape ecology." Thesis, Durham University, 2000. http://etheses.dur.ac.uk/4245/.

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Climate exerts a fundamental control on ecosystem function, species diversity and distribution. Topographic variability may influence surface climate, through processes operating at a landscape- scale. To quantify and model such influences, the topography of a 72 km(^2) area of complex terrain, (including the Moor House National Nature Reserve in northern England) was analysed at 50 m resolution. A suite of topographic variables was created, including distance relative to the Pennine ridge (dist), and elevation difference between each grid cell and the lowest grid cell within a specified neigh
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7

Avois-Jacquet, Carol. "Variabilité spatiale multiéchelle du zooplancton dans un lagoon récifal côtier (Multiscale spatial variability of zooplankton in a coastal reef lagoon)." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2002. http://tel.archives-ouvertes.fr/tel-00001767.

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Variabilité spatiale multiéchelle du zooplancton dans un lagoon récifal côtier - L'identification des changements dans les patrons écologiques selon l'échelle spatiale et la compréhension des processus qui génèrent ces changements sont d'une importance considérable en océanographie. Dans ce contexte, comprendre comment une communauté biologique répond à l'hétérogénéité environnementale requiert la connaissance des processus impliqués et l'échelle spatiale à laquelle ils opèrent. Les relations spatiales entre la variabilité du zooplancton et l'hétérogénéité environnementale sont encore imprécis
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8

Ramakrishnan, Lakshmikantan. "Environmental variability and ecological dynamics in spatially structured populations /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004361.

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9

ALVES, Amanda Lacerda. "Ecologia alimentar de Zoanthus sociatus e Protopalythoa variabilis (Cnidaria: Zoantharia) no litotal de Pernambuco, Brasil." Universidade Federal Rural de Pernambuco, 2015. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5234.

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Submitted by Mario BC (mario@bc.ufrpe.br) on 2016-08-09T13:09:24Z No. of bitstreams: 1 Amanda Lacerda Alves.pdf: 932884 bytes, checksum: f27ca0558b921d57172b3fae91cc1191 (MD5)<br>Made available in DSpace on 2016-08-09T13:09:24Z (GMT). No. of bitstreams: 1 Amanda Lacerda Alves.pdf: 932884 bytes, checksum: f27ca0558b921d57172b3fae91cc1191 (MD5) Previous issue date: 2015-03-26<br>This study investigated the feeding ecology of zoanthids Zoanthus sociatus and Protopalythoa variabilis. Colonies of this species were sampled in the infralittoral zone of reefs in northeastern Brazil (may/2013 to febr
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10

Gonzalez, Andrew. "Extinction : the role of habitat fragmentation and environmental variability." Thesis, Imperial College London, 1998. http://hdl.handle.net/10044/1/12032.

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11

Evangelista, Charlotte. "Variabilité intraspécifique chez les espèces invasives et ses conséquences sur le fonctionnement des écosystèmes aquatiques." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30233/document.

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Les invasions biologiques sont considérées comme étant une cause majeure de changement des écosystèmes. Les impacts écologiques des espèces invasives pourraient être modulés par la variabilité intraspécifique des traits biologiques et écologiques entre et au sein de leurs populations. Cette thèse a révélé, à différentes échelles spatiales, la présence de variabilités phénotypiques fortes chez deux espèces invasives, Lepomis gibbosus et Procambarus clarkii. Il est apparu que les réponses phénotypiques des individus aux conditions environnementales pourraient être complexes, révélant notamment l
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12

Gasmi, Sonia. "Ecologie trophique et reproduction d'une population sauvage d'huître creuse Crassostrea gigas dans un écosystème macrotidal, peu profond : cas du Bassin d'Arcachon." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0626/document.

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Le fonctionnement écologique des écosystèmes côtiers est soumis à l’action synergique des changements climatiques et des pressions anthropiques. Au sein du Bassin d’Arcachon, l’huître Crassostrea gigas, montre depuis quelques années une modification du cycle reproductif (i.e. faible formation des gamètes, retard de ponte), qui semble lié aux modifications globales des conditions thermiques et trophiques du milieu. L’objectif de ce travail consiste à réaliser un état des lieux de la variabilité spatio-temporelle de l’état reproductif des huîtres dans le Bassin d’Arcachon, en lien avec l’origine
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13

Vasseur, David Alan. "Temporal and hierarchical scales mediate environmental and ecological variability in food webs." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102226.

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Temporal changes in the environmental conditions upon which life depend are ubiquitous in nature, acting at every level of organisation from cells to ecosystems. Although the actions themselves are often poorly understood, they strongly depend on the temporal and hierarchical (organisational) scales at which they are measured; ecosystems are relatively stable through time while their species composition may undergo vast changes. Likewise any hierarchical level may be relatively stable in the short-term, but undergo vast long-term changes. This thesis aims to better understand the importance of
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14

Verdy, Ariane. "Dynamics of marine zooplankton : social behavior, ecological interactions, and physically-induced variability." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/43158.

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Thesis (Ph. D.)--Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2008.<br>Includes bibliographical references (p. [221]-232).<br>Marine ecosystems reflect the physical structure of their environment and the biological processes they carry out. This leads to spatial heterogeneity and temporal variability, some of which is imposed externally and some of which emerges from the ecological mechanisms themselves. The main focus of this thesis is on the formation of spati
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15

Pouder, Jessica Anne. "Using Human Footprint Models and Land-Cover Variability to Predict Ecological Processes." W&M ScholarWorks, 2014. https://scholarworks.wm.edu/etd/1539626953.

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16

Scheuerell, Mark David. "Environmental drivers of spatial and temporal variability in lakes /." Thesis, Connect to this title online; UW restricted, 2002. http://hdl.handle.net/1773/5144.

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17

McCarthy, Megan Campbell. "Plant Biomass Allocation: Understanding the Variability within Size Constraints." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/194007.

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The majority of studies on plant biomass partitioning have focused on the effects of environment. Optimal Partitioning Theory (OPT) suggests that plants should allocate biomass to the organ that acquires the most limiting resource. Though, it has recently been disputed as to how much of this variation is due to variation in size and not environment. Additionally, while a few studies have examined differences between growth forms, the effects of evolutionary history have been largely ignored. Leaf morphology and physiology may also contribute to patterns of biomass partitioning.The role of p
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18

MOURA, Carina Carneiro de Melo. "Ecologia e conservação dos testudines, Nordeste do Brasil." Universidade Federal Rural de Pernambuco, 2013. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/5410.

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Submitted by (ana.araujo@ufrpe.br) on 2016-08-19T15:39:02Z No. of bitstreams: 1 Carina Carneiro de Melo Moura.pdf: 2573558 bytes, checksum: 252687e022e5525fdfa76d18da7b8ef2 (MD5)<br>Made available in DSpace on 2016-08-19T15:39:02Z (GMT). No. of bitstreams: 1 Carina Carneiro de Melo Moura.pdf: 2573558 bytes, checksum: 252687e022e5525fdfa76d18da7b8ef2 (MD5) Previous issue date: 2013-02-26<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Studies that aimed investigating the ecology and genetic diversity of populations of Testudines are essential to evaluate the respon
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19

Papacostas, Katherine J. "Spatial and Temporal Variability in Marine Invasion and Trophic Dynamics." Diss., Temple University Libraries, 2014. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/305874.

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Biology<br>Ph.D.<br>Species interactions are central to the study of community ecology, but these interactions can change with context. For instance, predator-prey interactions can vary with species introductions, spatial scale and temporal scale, and we are still learning how such factors can influence the strength of these interactions. Studying species interactions via multifaceted approaches and at different scales aids in the understanding of local and large scale processes, and can lead to predictions of how our ecosystems will persist in the face of continued anthropogenic alteration of
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20

Hellberg, Erik. "Historical variability of deciduous trees and deciduous forests in northern Sweden : effects of forest fires, land-use and climate /." Umeå : Dept. of Forest Vegetation Ecology, Swedish Univ. of Agricultural Sciences, 2004. http://epsilon.slu.se/s308.pdf.

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21

Chadburn, R. G. "An investigation into the genetics and ecology of a closed semi-natural population of Drosophila melanogaster." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377122.

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22

McNeil, Brenden E. "Spatial variability of foliar nitrogen in the Adirondack Park, New York." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2006. http://proquest.umi.com/login?COPT=REJTPTU0NWQmSU5UPTAmVkVSPTI=&clientId=3739.

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23

Patino, Victor. "Ecological study of factors associated with homicide rate variability in El Salvador, 2016." Thesis, Biostatistics program, 2021. https://hdl.handle.net/2123/25585.

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Workplace Project Portfolio. Ecological study of factors associated with homicide rate variability in El Salvador, 2016. Location and dates: Homicide victims in El Salvador throughout 2016. Context: The preface provides a brief summary of the general context for this project; it is included again here to provide an adequate overview of the study. Latin America in general, and Central America in particular, are renowned for their epidemic levels of homicide rates. Inter-national as well as intra-national variability in violent crimes may provide questions and answers aimed at pinpointin
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24

Fava, Federica <1978&gt. "Spatial and temporal variability and ecological processes in the epibenthic assemblages of the northern Adriatic Sea." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3677/1/Fava_Federica_Tesi.pdf.

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Several coralligenous reefs occur in the soft bottoms of the northern Adriatic continental shelf. Mediterranean coralligenous habitats are characterised by high species diversity and are intrinsically valuable for their biological diversity and for the ecological processes they support. The conservation and management of these habitats require quantifying spatial and temporal variability of their benthic assemblages. This PhD thesis aims to give a relevant contribution to the knowledge of the structure and dynamics of the epibenthic assemblages on the coralligenous subtidal reefs occurring in
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25

Fava, Federica <1978&gt. "Spatial and temporal variability and ecological processes in the epibenthic assemblages of the northern Adriatic Sea." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3677/.

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Several coralligenous reefs occur in the soft bottoms of the northern Adriatic continental shelf. Mediterranean coralligenous habitats are characterised by high species diversity and are intrinsically valuable for their biological diversity and for the ecological processes they support. The conservation and management of these habitats require quantifying spatial and temporal variability of their benthic assemblages. This PhD thesis aims to give a relevant contribution to the knowledge of the structure and dynamics of the epibenthic assemblages on the coralligenous subtidal reefs occurring in
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26

Zapata, Martha J. Zapata. "Spatial and temporal variability in aquatic-terrestrial trophic linkages in a subtropical estuary." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1515139504483898.

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27

Mellado, Díaz Andrés. "Ecología de las comunidades de macroinvertebrados de la Cuenca del Río Segura (SE de España). Factores ambientales, variabilidad espacio-temporal, táxones indicadores, patrones de diversidad, rasgos biológicos-ecológicos y aplicaciones para la evaluación biológica. The Ecology of Stream Macroinvertebrate Assemblages from the Segura River Basin (SE Spain): Environmental factors, spatio-temporal variability, indicator taxa, diversity trends, biological-ecological traits and applications for bioassessment." Doctoral thesis, Universidad de Murcia, 2005. http://hdl.handle.net/10803/10777.

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Capítulo 1. Evaluación biológica con macroinvertebrados en ríos de la cuenca del Segura: efectos de las tendencias estacionales, métodos de procesado y resolución taxonómica sobre patrones multivariantes y métricas de diversidad.Capítulo 2. Las comunidades de macroinvertebrados de la cuenca del Río Segura: tipos de ríos, táxones indicadores y factores ambientales.Capítulo 3. Rasgos biológicos y ecológicos de los macroinvertebrados acuáticos en una cuenca semiárida. Patrones a lo largo de gradientes ambientales complejos.Capítulo 4. Riqueza, diversidad y diversidad funcional en comunidades de
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28

Cavraro, Francesco <1982&gt. "Genetica, ecologia e comportamento di un biomonitore della variabilità di sistemi acquatici di transizione." Doctoral thesis, Università Ca' Foscari Venezia, 2013. http://hdl.handle.net/10579/3041.

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I sistemi acquatici di transizione rivestono un ruolo fondamentale nel funzionamento degli ecosistemi marini. Nelle aree costiere italiane è presente un’unica specie di ciprinodontide, Aphanius fasciatus (Valenciennes, 1821), che svolge il suo intero ciclo vitale in questi habitat, profilandosi dunque come un tipico residente estuarino. Il presente progetto ha esplorato la possibilità di utilizzare Aphanius fasciatus come “biomonitore” delle variazioni ambientali alle quali i sistemi barenicoli della laguna di Venezia sono soggetti, investigando le risposte adattative della specie a livello di
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29

Andolina, Cristina <1986&gt. "Trophic niche variability of fish populations and communities as a response to ontogeny, habitat heterogeneity and restoration." Doctoral thesis, Università Ca' Foscari Venezia, 2016. http://hdl.handle.net/10579/10331.

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Natural variability in ecosystems arises from intrinsic dynamics of both biotic and abiotic processes, which contribute to structure the variability within different levels of organization, from individuals to populations to communities. This study examined the natural variability of trophic organization as a response to different drivers of change, typical of transitional environments. Investigation was focused on fish populations of lagoon ecosystems and the variability of their trophic niche as a response to: (i) habitat heterogeneity, (ii) habitat restoration and (iii) ontogenetic developm
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30

Mell, Florian. "Expertise en patinage en hockey sur glace : effet des contraintes de tâche." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMR108/document.

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Nos recherches s'inscrivent dans le cadre théorique Ecological Dynamics du contrôle moteur, considérant que le comportement moteur, émerge, persiste et se réorganise en fonction des interactions de l’individu avec un ensemble de contraintes. Sur cette base, nous explorons les indices permettant de rendre compte de l’adaptation motrice du hockeyeur à diverses contraintes afin d’analyser l’expertise. À ce titre, nous avons conduit nos recherches en deux temps : i) une analyse qualitative d’entretiens semi-directifs, et ii) une analyse des paramètres superficiels (cinématique et cinétique) et pro
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31

Recalde, Salas Angela Paola. "Variability in Baleen Whale Acoustical Ecology: Implications for Optimal Monitoring Using Passive Acoustics." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/80627.

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This study aimed to improve the acoustical ecology knowledge of humpback and pygmy blue whales migrating through Geographe Bay - Western Australia. Vocalisations produced by each species were described. Vocalisation rates and detection probabilities varied between species and were dependent on temporal, behavioural and ecological parameters. Correlations between sound energy and visual observations were low for both species. This information suggests that optimal monitoring protocols for passive acoustics should be species specific.
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32

Lehnebach, Romain. "Etude de la variabilité ontogénique du profil ligneux chez quelques espèces forestières tropicales de Guyane Française." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS021/document.

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Le bois est un tissu plurifonctionnel permettant la conduction de la sève brute, le stockage de l’eau et des sucres ainsi que le soutien mécanique de la plante. L’arbre au cours de son développement expérimente différentes contraintes liées à son environnement et à sa taille croissante. En réponse à ces contraintes, les performances fonctionnelles du bois sont ajustées par des variations de valeurs de propriétés, elles-mêmes dépendantes du produit de la xylogénèse. Cependant les extrais chimiques déposés lors du processus de duraminisation, entraine la modification des propriétés du bois. Les
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33

Prudden, H. J. "Determinants of population variability in HIV across West Africa : ecological and mathematical modelling analyses." Thesis, London School of Hygiene and Tropical Medicine (University of London), 2016. http://researchonline.lshtm.ac.uk/2634790/.

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Introduction: Mathematical models of HIV transmission have played an important role in helping to understand the drivers of the HIV epidemic, and shape the global HIV response. The underlying approaches, assumptions and structures used in HIV modelling have the potential to fundamentally influence the conclusions of any modelling analyses. For this reason, it is important that approaches to modelling HIV transmission in different contexts carefully consider how best to ‘characterise’ a populations distribution of risk and networks of sexual interaction based on data, and the implications of in
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34

Bi, Yan. "Impact of socio-ecological variability on the transmission of malaria in Yunnan Province, China." Thesis, Queensland University of Technology, 2013. https://eprints.qut.edu.au/64151/1/Yan_Bi_Thesis.pdf.

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This thesis is a population-based epidemiological study to explore the spatial and temporal pattern of malaria, and to assess the relationship between socio-ecological factors and malaria in Yunnan, China. Geospatial and temporal approaches were applied; the high risk areas of the disease were identified; and socio-ecological drivers of malaria were assessed. These findings will provide important evidence for the control and prevention of malaria in China and other countries with a similar situation of endemic malaria.
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35

Akter, Rokeya. "Exploring the effects of socio-ecological factors and climate variability on dengue in Australia." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/209682/1/Rokeya_Akter_Thesis.pdf.

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Dengue, a mosquito borne disease, is a serious public health problem in many tropical and subtropical countries including Australia. Both climate and socio-ecological factors play significant role in dengue transmission cycle. This thesis applied spatiotemporal analytical approach to explore the joint effects of socio-ecological factors and climate variability on dengue and assess the response of dengue to climate variability across different climate zones. The findings of the thesis provide valuable information for developing early warning systems especially suitable for particular climate zo
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36

Salgado, Hernanz Paula Maria. "Patterns of phytoplankton and primary production variability in the Mediterranean Sea based on remote sensing data." Doctoral thesis, Universitat de les Illes Balears, 2019. http://hdl.handle.net/10803/667024.

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[eng] This PhD thesis aims to assess the spatial and temporal patterns of phytoplankton variability and primary production in the surface waters of the Mediterranean Sea. The research is organized in three studies and it is mainly based on the use of satellite ocean color data acquired during the period 1998-2015. Complementary datasets (e.g. sea surface temperature, climatic indices, meteorological data, and atmospheric dust) are also used to address the different specific studies included in this work. A first study is aimed to analyze the contribution of the seasonal and non-seasonal
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37

Yu, Songyan. "Spatio-temporal dynamics and hydro-ecology of intermittent streams in eastern Australia." Thesis, Griffith University, 2019. http://hdl.handle.net/10072/389088.

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Intermittent streams that cease to flow for some period of most years are prevalent across global river networks. Their spatial extent is projected to increase in regions experiencing drying trends related to climate change and water extraction for human uses. Intermittent streams sustain biodiversity by hosting a unique combination of aquatic, amphibious, and terrestrial assemblages as a result of their wet and dry phases. Compared to perennial streams, the ecological values of intermittent streams are not well-appreciated or understood, and thus intermittent streams are less commonly incorpo
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38

Wu, Jin. "How do Amazonian Tropical Forest Systems Photosynthesize under Seasonal Climatic Variability: Insights from Tropical Phenology." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/594653.

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Amazonian evergreen forests are of broad interest, attributable to their ecological, economic, aesthetic, and cultural importance. However, their fate under climate change remains uncertain, largely due to unclear mechanisms in regulating tropical photosynthetic metabolism. Understanding mechanistic controls on these dynamics across time scales (e.g. hours to years) is essential and a prerequisite for realistically predicting tropical forest responses to inter-annual and longer-term climate variation and change. Tropical forest photosynthesis can be conceptualized as being driven by two intera
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39

Schrag, Anne Michelle. "Climate variability and treeline dynamics in Yellowstone and Grand Teton National Parks." Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/schrag/SchragA1206.pdf.

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40

Wethington, Susan Marie. "Some effects of variability in nectar renewal-rates on the hummingbird-foraging/plant-pollination mutualism." Diss., The University of Arizona, 2000. http://hdl.handle.net/10150/284254.

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How does variability in nectar secretion rates affect the interaction between hummingbirds and the plants that: they pollinate? Other researchers have suggested that variability may influence pollinators to leave a plant earlier, thus increasing the potential for cross-pollination. My dissertation asks the following questions: Does variability in nectar secretion rates influence hummingbird visitation at a flower patch? Does it do so in a manner that is likely to increase; cross-pollination? And, does variability in these rates benefit the hummingbird by improving their foraging efficiency? By
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41

Teixeira, José Reinaldo Paranaíba Vilela Alves. "High spatial variability of carbon emission and gas exchange coefficient in three tropical reservoirs." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/5656.

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Submitted by isabela.moljf@hotmail.com (isabela.moljf@hotmail.com) on 2017-08-21T12:33:28Z No. of bitstreams: 1 josereinaldoparanaíbavilelaalvesteixeira.pdf: 2117426 bytes, checksum: aa0a05017e73d403c957cab1a18a6f52 (MD5)<br>Rejected by Adriana Oliveira (adriana.oliveira@ufjf.edu.br), reason: on 2017-08-24T11:30:53Z (GMT)<br>Submitted by isabela.moljf@hotmail.com (isabela.moljf@hotmail.com) on 2017-08-24T13:22:27Z No. of bitstreams: 0<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-08-30T12:31:54Z (GMT) No. of bitstreams: 0<br>Made available in
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42

Deng, Ying [Verfasser], and Oliver [Akademischer Betreuer] Bossdorf. "Ecological and evolutionary relevance of plant responses to environmental variability / Ying Deng ; Betreuer: Oliver Bossdorf." Tübingen : Universitätsbibliothek Tübingen, 2019. http://d-nb.info/1189654059/34.

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43

Ward, Catherine Dale. "Climate variability in social-ecological systems of the Southern Cape: integrating farming and fishing perspectives." Doctoral thesis, Faculty of Science, 2018. http://hdl.handle.net/11427/30088.

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Large scale shifts playing out on global climate levels are manifesting locally in the South Africa’s terrestrial and marine ecosystems, where it is difficult to predict how different habitats may respond to these changes in natural systems, particularly at local levels. For example, the highly complex nature of climate variability in the southern Cape and on the Agulhas Bank, coupled with the lack of long-term environmental monitoring data, has resulted in knowledge gaps on how climate impacts these local social-ecological systems. This thesis focuses on bringing together knowledge systems fr
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44

Nye, Janet Ashley. "Bioenergetic and ecological consequences of diet variability in Atlantic croaker (Micropogonias undulatus) in Chesapeake Bay." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8140.

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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.<br>Thesis research directed by: Marine, Estuarine, Environmental Sciences Graduate Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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45

Gulish, Matthew C. "SEASONAL VARIABILITY OF AQUATIC AND TERRESTRIAL INVERTEBRATES IN A FORESTED STREAM ECOSYSTEM." Kent State University Honors College / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1544453804036894.

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46

Millan, Mathieu. "Analyse de la variabilité des traits architecturaux des formes de croissance dans les communautés végétales." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT151.

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Les formes de croissance végétales ont fait l'objet de nombreuses études mais elles constituent encore aujourd'hui un ensemble mal défini et sans cesse remis en question en raison de l'incohérence et de l'hétérogénéité des méthodes employées pour les analyser. Cette imprécision a des répercussions négatives lorsque les formes de croissance sont utilisées dans l'étude des communautés végétales et de leur dynamique. Nous avons tenté de remédier partiellement à cette situation en appliquant à certaines d'entre elles la méthode d'analyse architecturale initiée par Hallé et Oldeman dont l'efficacit
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47

Rosam, Jodie Ray. "Assessment of light quality, variability, and seedling presence in Hawaiian lowland wet forests." Thesis, University of Hawai'i at Hilo, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1596447.

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<p>Hawaiian lowland wet forest (HLWF) plant species are light-limited, yet no information exists on how the understory light varies in relation to species invasion, or if patterns of seedling regeneration and light are linked. I measured the red-to-far-red ratio (R:FR) of light to assess light quality and quantified diurnal variability in three forest types: native-dominated, partially-invaded, and fully invaded by strawberry guava (Psidium cattleianum). I asked: (1) how does understory light quality vary relative to invasion? (2) Are there differences in light quality moving vertically among
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48

Saunders, Ryan Alexander. "Ecological investigations of euphausiids at high latitudes." Thesis, St Andrews, 2007. http://hdl.handle.net/10023/347.

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49

Accoroni, Stefano. "Ecology, morphological variability and life cycle stages of the toxic benthic dinoflagellate Ostreopsis cf. ovata." Doctoral thesis, Università Politecnica delle Marche, 2013. http://hdl.handle.net/11566/242557.

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La dinoflagellata bentonica Ostreopsis cf. ovata causa fioriture lungo le coste del Mediterraneo, spesso associate a intossicazione dei bagnanti e a morie di organismi marini dovuti alla produzione di palitossine. È stato studiato il ciclo vitale di O. cf. ovata allo scopo di valutare se la riproduzione sessuata avviene in omo e/o in eterotallia. Questa avveniva in entrambe le condizioni, sebbene l’eterotallia sembri essere la via favorita. La limitazione di nutrienti sembra stimolare gli stadi sessuali. Sono stati identificati diversi morfotipi: gameti, planozigoti, stadi della maturazione de
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50

Mead, Michael Phillip. "The Theory of Planned Behavior and Sleep Opportunity: An Ecological Momentary Assessment of Intra-Individual Variability." Diss., North Dakota State University, 2020. https://hdl.handle.net/10365/31927.

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Insufficient sleep duration is associated with poor physical and mental health outcomes, and many Americans report that they are not meeting sleep duration recommendations. Many individuals choose to restrict their own sleep, yet little is known about the source of this sleep deficit. Recent research efforts have used the Theory of Planned Behavior (TPB) to predict sleep health behavior. However, this research is limited in that it fails to measure volitional sleep behavior and focuses exclusively on between-person differences. This study addressed these limitations by using an intensive longi
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