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Dissertations / Theses on the topic 'Trophic gradient'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Schebor, Hayley A. "Ammonia-oxidizing bacteria and archaea across a freshwater trophic gradient." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1407092663.

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2

Muti, Rachel. "Characterization of WHY1 in Corallorhiza: Evolution, Expression, and Selection Across a Trophic Gradient." Otterbein University Distinction Theses / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=otbndist1620463573548479.

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3

Harrower, William Laughton. "Changes in trophic structure along a gradient of water availability in temperate montane grasslands." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/60600.

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Predators and plants are inextricably linked by the flow of energy in ecosystems. However, we still lack good descriptions of how predators affect the diversity, function, and stability of ecosystems under different environmental conditions. If water availability to plants modifies the interactions between predators and plants, and changes in these species interactions lead to a modification of trophic structure, then the direction and strength of trophic cascades must depend on the availability of water to plants. I use the unifying concept of the trophic cascade and an underlying gradient of

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4

Hopcroft, Russell Ross. "Size-related patterns in growth rate and production of tropical marine planktonic communities along a trophic gradient." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24410.pdf.

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5

Magnoni, Ana Paula Vidotto [UNESP]. "Ecologia trófica das assembléias de peixes do reservatório de Chavantes (Medio rio Paranapanema. SP/PR)." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/106518.

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Made available in DSpace on 2014-06-11T19:35:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2009-02-16Bitstream added on 2014-06-13T19:05:55Z : No. of bitstreams: 1 magnoni_apv_dr_botib.pdf: 4022379 bytes, checksum: 443c6ffc4d48e73996f7b0cb4982f851 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Este estudo foi conduzido no reservatório de Chavantes, médio rio Paranapanema, SP/PR, Brasil, sendo o seu objetivo avaliar o papel da compartimentalização deste grande reservatório na distribuição das espécies, partilha de recursos e estrutura e organização tróf

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6

Magnoni, Ana Paula Vidotto. "Ecologia trófica das assembléias de peixes do reservatório de Chavantes (Medio rio Paranapanema. SP/PR) /." Botucatu : [s.n.], 2009. http://hdl.handle.net/11449/106518.

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Resumo: Este estudo foi conduzido no reservatório de Chavantes, médio rio Paranapanema, SP/PR, Brasil, sendo o seu objetivo avaliar o papel da compartimentalização deste grande reservatório na distribuição das espécies, partilha de recursos e estrutura e organização trófica das assembléias de peixes. Os peixes foram coletados trimestralmente entre outubro/2005 e julho/2006, com redes de espera, redes de arrasto e peneirão em seis trechos ao longo do gradiente longitudinal do reservatório, representado por dois trechos lóticos (ITA e VER), dois trechos intermediários ou de transição (PAR e FAR)

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7

Figueiredo, Gabriela Guerra Araújo Abrantes de. "Variação na estrutura trófica e no uso dos recursos alimentares da ictiofauna de zonas rasas ao longo de um gradiente estuarino-límnico." reponame:Repositório Institucional da FURG, 2014. http://repositorio.furg.br/handle/1/6114.

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Submitted by dayse paz (daysepaz@hotmail.com) on 2016-04-06T18:25:56Z No. of bitstreams: 1 Disserta_o_Mestrado_Gabriela_Guerra_PPGBAC.pdf: 2204919 bytes, checksum: 182150838d9e5538ccbbc7e9a89712a4 (MD5)<br>Approved for entry into archive by cleuza maria medina dos santos (cleuzamai@yahoo.com.br) on 2016-05-10T20:07:01Z (GMT) No. of bitstreams: 1 Disserta_o_Mestrado_Gabriela_Guerra_PPGBAC.pdf: 2204919 bytes, checksum: 182150838d9e5538ccbbc7e9a89712a4 (MD5)<br>Made available in DSpace on 2016-05-10T20:07:01Z (GMT). No. of bitstreams: 1 Disserta_o_Mestrado_Gabriela_Guerra_PPGBAC.pdf: 2204919 byt

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8

Parkinson, Matthew Cameron. "Contributions of inshore and offshore sources of primary production to the foodweb, and the trophic connectivity between various habitats along a depth-gradient, in Sodwana Bay, Kwazulu-Natal, South Africa." Thesis, Rhodes University, 2013. http://hdl.handle.net/10962/d1001630.

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Sodwana Bay, situated within the iSimangaliso Wetland Park, is ecologically important as it contains high-latitude corals and the most southerly known population of coelacanths. This thesis utilised stable isotope and lipid analyses to investigate the trophic ecology of the area, in particular, understanding the relative contribution of inshore and offshore primary production to consumers inhabiting intertidal and shallow subtidal, coral reef, deep reef, canyon head and pelagic habitats. Seaweeds, excluding certain species of red seaweeds with highly depleted carbon signatures, and phytoplankt

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9

Ruiz, Jarrin Diego J. [Verfasser], Matthias [Akademischer Betreuer] Wolff, and Hauke [Akademischer Betreuer] Reuter. "Energy flow and trophic structure of Galápagos shallow rocky reef systems along a gradient of productivity and artisanal fisheries / Diego J Ruiz Jarrin. Gutachter: Matthias Wolff ; Hauke Reuter. Betreuer: Matthias Wolff." Bremen : Staats- und Universitätsbibliothek Bremen, 2015. http://d-nb.info/1077061730/34.

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10

Bluhm, Christian [Verfasser], Mark [Akademischer Betreuer] [Gutachter] Maraun, and Stefan [Gutachter] Scheu. "Oribatid mite community structure and trophic ecology along a forest land-use gradient: effect of dead wood, time and root-trenching / Christian Bluhm ; Gutachter: Mark Maraun, Stefan Scheu ; Betreuer: Mark Maraun." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://d-nb.info/1117219569/34.

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11

Vockenhuber, Elke [Verfasser], Teja [Akademischer Betreuer] Tscharntke, and Stefan [Akademischer Betreuer] Vidal. "Herb layer characteristics, fly communities and trophic interactions along a gradient of tree and herb diversity in a temperate deciduous forest / Elke Vockenhuber. Gutachter: Teja Tscharntke ; Stefan Vidal. Betreuer: Teja Tscharntke." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2011. http://d-nb.info/1043595589/34.

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12

Kenly, Travonya L. "Variability in Invertebrate Trophic Networks along Stream Nutrient Gradients." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1525715627495345.

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13

Larkin, Kate E. "Community and trophic responses of benthic Foraminifera to oxygen gradients and organic enrichment." Thesis, University of Southampton, 2006. https://eprints.soton.ac.uk/45994/.

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Global warming and eutrophication are driving an expansion of hypoxia in the World Ocean. This will favour organisms, such as Foraminifera (testate protists), that tolerate low-oxygen conditions and may lead to an overall decline in marine biodiversity. With this in mind, community and trophic responses of benthic Foraminifera were investigated at two contrasting sites in the upper boundary (140 m water depth; bottom-water oxygen concentrations = 2.05 mll-1 during the spring intermonsoon and 0.11 mll-1 during the SW monsoon) and the core (300 m water depth; bottom-water oxygen concentration co

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14

Oksanen, Tarja. "Predator-prey dynamics in small mammals along gradients of primary productivity." Doctoral thesis, Umeå universitet, Ekologi och geovetenskap, 1990. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-110673.

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15

Artioli, Luiz Guilherme Schultz. "As assembléias de peixes da Zona Litoral de Lagoas Costeiras Subtropicais do Sistema do Rio Tramandaí/RS : aspectos amostrais, variações espaciais e temporais de descritores ecológicos e suas relações com a variabilidade ambiental." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/72376.

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Lagoas costeiras são ecossistemas cruciais para conservação da biodiversidade local e global. O sistema do rio Tramandaí (SRT) apresenta uma série de lagoas costeiras rasas conectadas por canais naturais, e uma saída, via estuário de Tramandaí, para o oceano. Esse sistema é dividido em dois subsistemas, ao norte e ao sul do estuário, resultado de padrões hidrodinâmicos e da influência do vento e que definem características ambientais distintas a esses subsistemas. Um gradiente decrescente, de norte a sul, no estado trófico dessas lagoas já foi verificado. No presente estudo é testada hipótese

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16

Albessard, Eric. "Etude de la structure et du métabolisme lipidique de l'euphausiacé Meganyctiphanes norvegica : influence d'un gradient tropho-climatique." Lyon 1, 2003. http://www.theses.fr/2003LYO10045.

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Le but de cette étude est d'évaluer l'impact d'un gradient climatique et trophique sur la structure et le métabolisme des lipides de l'euphausiacé Meganyctiphanes norvegica entre trois biotopes très contrastés: la Mer Ligure, La Mer de Clyde et le Kattegat afin de préciser les mécanismes adaptatifs de l'espèce. L'étude de la reproduction et des facteurs environnementaux (conditions trophiques, température et salinité) agissant sur les lipides, composante énergétique essentielle, rassemble les variables majeures déterminant le succès de l'espèce. La reproduction de M. Norvegica fait largement a

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17

Zimmermann, Beate. "Spatial and temporal variability of the soil saturated hydraulic conductivity in gradients of disturbance." Phd thesis, Universität Potsdam, 2007. http://opus.kobv.de/ubp/volltexte/2008/1640/.

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As land-cover conversion continues to expand into ever more remote areas in the humid tropics, montane rainforests are increasingly threatened. In the south Ecuadorian Andes, they are not only subject to man-made disturbances but also to naturally occurring landslides. I was interested in the impact of this ecosystem dynamics on a key parameter of the hydrologic cycle, the soil saturated hydraulic conductivity (synonym: permeability; Ks from here on), because it is a sensitive indicator for soil disturbances. My general objective was to quantify the effects of the regional natural and human

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18

Gras, Pierre [Verfasser], Teja [Akademischer Betreuer] Tscharntke, Stefan [Akademischer Betreuer] Vidal, et al. "Trophic interactions of ants, birds and bats affecting crop yield along shade gradients in tropical agroforestry / Pierre Gras. Betreuer: Teja Tscharntke. Gutachter: Stefan Vidal ; Yann Clough ; Christoph Scherber ; Kerstin Wiegand ; Mark Maraun." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://d-nb.info/1080030271/34.

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19

Hernández, Rojas Adriana Carolina [Verfasser], and Georg [Akademischer Betreuer] Miehe. "Biogeographical patterns of species richness, range size and phylogenetic diversity of ferns along elevational-latitudinal gradients in the tropics and its transition zone / Adriana Carolina Hernández Rojas ; Betreuer: Georg Miehe." Marburg : Philipps-Universität Marburg, 2020. http://d-nb.info/1223130835/34.

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20

Ohlmann, Marc. "Vers une théorie spatiale des réseaux d'interaction en écologie : méthodes, concepts et applications Diversity indices for ecological networks : a unifying framework using Hill numbers Unveiling the food webs of tetrapods across Europe through the prism of the Eltonian niche A spatial theory of mutualistic metacommunities : assesment of metacommunity capacity (in prep) Mapping the imprint of biotic interactions on β-diversity Multi-trophic -diversity mediates the effect of environmental gradients on the turnover of multiple ecosystem functions Combining abundances from different markers for environmental DNA (in prep)". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAV065.

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Cette thèse s’intéresse aux liens entre réseaux d’interactions en écologie, espace et temps. On assiste à un changement croissant de représentation d’un communauté d’espèces, d’un ensemble d’espèces à un ensemble d’espèces et leurs interactions : un réseau d’interactions. On s’attachera alors à élaborer les prémisses d’une théorie spatiale des réseaux, en développant des méthodes, des modèles et en les appliquant sur des données écologiques. La thèse s’articule autour de quatre chapitres. Dans un premier chapitre, on se penchera sur le problème de comparaison de réseau en différents points du

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21

Vockenhuber, Elke. "Herb layer characteristics, fly communities and trophic interactions along a gradient of tree and herb diversity in a temperate deciduous forest." Thesis, 2011. http://hdl.handle.net/11858/00-1735-0000-0006-B3AC-E.

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22

Bluhm, Christian. "Oribatid mite community structure and trophic ecology along a forest land-use gradient: effect of dead wood, time and root-trenching." Doctoral thesis, 2016. http://hdl.handle.net/11858/00-1735-0000-002B-7C4B-E.

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23

TVARDÍKOVÁ, Kateřina. "Trophic relationships between insectivorous birds and insect in Papua New Guinea." Doctoral thesis, 2013. http://www.nusl.cz/ntk/nusl-156658.

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The thesis describes diversity of birds along a complete altitudinal gradient and in forest fragments in lowlands of Papua New Guinea. It focuses separately on the diversity of different feeding guilds, and discusses their links to habitat and food resources. More specifically, it focuses on forest insectivorous birds, their predation pressure on arthropods, feeding specializations and preferences, and some of the ways how insectivores search for food.

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24

Schlinkert, Hella. "Multitrophic interactions along a plant size gradient in Brassicaceae." Doctoral thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0022-5DC4-E.

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Das Wissen über Mechanismen, die einen Einfluss auf Muster der Artenvielfalt und biotische Interaktionen haben, ist grundlegend für den Schutz von Biodiversität. Darüber hinaus kann es von direktem ökonomischem Nutzen sein, zum Beispiel im biologischen Pflanzenschutz oder bei Bestäubungsdienstleistungen. Die Größe eines Organismus kann ein solcher Faktor sein, der die Artenzahl und Interaktionen der assoziierten Organismen beeinflusst, denn große Organismen sind auffälliger als kleine und ihr Angebot an Ressourcen und Nischen für mit ihnen assoziierte Organismen ist oft reicher. Bezogen auf Pf

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25

Gras, Pierre. "Trophic interactions of ants, birds and bats affecting crop yield along shade gradients in tropical agroforestry." Doctoral thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0028-8666-7.

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26

Dubský, Marek. "Diverzita a abundance ptáků podél výškového gradientu Kamerunských hor." Master's thesis, 2020. http://www.nusl.cz/ntk/nusl-435820.

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The aim of this thesis is to describe the changes of bird species diversity along elevation gradient on six mounts in Cameroon and nearby Bioko island. The results of the analyses confirm most of the defined hypotheses, especially they show that species diversity declines with altitude and rises with area. Cluster analysis shows the similarity of individual mountains in particular altitude zones. Despite the original hypothesis, mount Cameroon is found to be most similar to mount Kupé, although high mountain assemblages of mount Cameroon and Bioko island are very alike as well. The absolutely

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27

Guarnizo, Carlos Enrique. "Effect of topography on genetic divergence and phenotypic traits in tropical frogs." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-3726.

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Complex interactions between topographic heterogeneity and steep gradients in climate and environmental conditions are commonly assumed to promote biotic diversification. Using tropical frogs as a model, I investigate the nature of these interactions that disrupt migration between populations, causing genetic divergence and speciation. I determine the role of several putative factors that affect gene flow (Euclidean distances, Least Cost Path (LCP) distances, topographic complexity, and elevation difference) and promote genetic structure (FST) between populations of three tropical Andean frog

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28

Höhn, Patrick. "Funktionelle Vielfalt von Hymenopteren entlang eines Gradienten agroforstlicher Nutzung in Indonesien." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-000D-F136-9.

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29

Röderstein, Marina. "Struktur und Dynamik des Feinwurzelsystems von tropischen Bergwäldern in Abhängigkeit von der Meereshöhe in Südecuador." Doctoral thesis, 2006. http://hdl.handle.net/11858/00-1735-0000-0006-B6E4-1.

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Se investigó la estructura y la dinámica de las raíces finas a lo largo de un gradiente altitudinal en un bosque montano de lluvioso en el sur de Ecuador. Se estudió la biomasa y la necromasa de las raíces finas, la distribución espacial, la morfología de las raíces vivas y muertas asi como su distribución temporal en tres localidades ubicadas a 1890 m, 2380 m y 3060 m sobre el nivel del mar.Se pudo comprobar un incremento de la masa de las raíces finas en la capa orgánica y en el suelo mineral

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30

Jacome, Reyes Jorge Hernan. "Factors controlling the lower elevational limits in tropical montane plants in the Andes and their implications under the current climatic change." Doctoral thesis, 2005. http://hdl.handle.net/11858/00-1735-0000-0006-B6D5-3.

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31

Straka, Jason Ryan. "Humming along or buzzing off?: the elusive consequences of plant-pollinator mismatches and factors limiting seed set in the Coast Range of British Columbia." Thesis, 2012. http://hdl.handle.net/1828/4326.

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There is concern that climate change may cause mismatches between timing of flowering and activity of pollinators (phenology). However, concluding that mismatches will occur, and have serious consequences for pollination services, requires assumptions that have not yet been tested. I begin by discussing a set of these assumptions, bringing past research into the context of mismatch. Briefly, the assumptions are that 1) dates of first-flowering or emergence (DFFE) correctly describe phenology (and therefore mismatch); 2) differences in DFFE represent the magnitude of mismatch; 3) advancement of

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