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Dissertations / Theses on the topic 'Mormyrid'

Author: Grafiati
Published: 5 June 2025
Last updated: 15 July 2025

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1

Agmon, Eran. "A Computational Model of Adaptive Sensory Processing in the Electroreception of Mormyrid Electric Fish." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/291.

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Electroreception is a sensory modality found in some fish, which enables them to sense the environment through the detection of electric fields. Biological experimentation on this ability has built an intricate framework that has identified many of the components involved in electroreception's production, but lack the framework for bringing the details back together into a system-level model of how they operate together. This thesis builds and tests a computational model of the Electrosensory Lateral Line Lobe (ELL) in mormyrid electric fish in an attempt to bring some of electroreception's st
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2

Worm, Martin [Verfasser]. "Animal-Robot Interactions: Electrocommunication, Sensory Ecology, and Group Dynamics in a Mormyrid Weakly Electric Fish / Martin Worm." Bonn : Universitäts- und Landesbibliothek Bonn, 2018. http://d-nb.info/1173789774/34.

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3

LITEL, CATHERINE. "Rythmes de decharge de poissons electriques (mormyridae) : aspects structuraux et fonctionnels." Tours, 1997. http://www.theses.fr/1997TOUR4020.

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Les mormyres, poissons des eaux douces africaines, emettent en permanence des impulsions de quelques volts ayant un role d'electrolocalisation et d'electrocommunication. Ces impulsions, de forme et d'intensite constantes pour un individu donne, sont emises a des intervalles de temps (intervalles inter-impulsions) tres variables. Deux parametres ont ete utilises pour caracteriser ces rythmes de decharge : le nombre d'impulsions par seconde (cadence de decharge) et leur organisation temporelle. La nature, les causes, et les fonctions de la variabilite de ces rythmes font l'objet de notre etude.
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4

Graff, Christian. "Signaux électriques et comportement social du poisson à faibles décharges, Marcusenius macrolepidotus (mormyridae, teleostei)." Paris 11, 1986. http://www.theses.fr/1986PA112054.

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Cette thèse concerne Marcusenius macrolepidotus (mormyridae, teleostei), poisson émetteur de faibles impulsions électriques. Elle décrit son comportement social locomoteur et électrique. Les organes émetteurs et récepteurs d'électricité sont révélés histologiquement. Les mouvements de groupes sont observés en milieux variés puis quantifiés en conditions expérimentales permettant simultanément l'enregistrement de l'activité électrique du groupe et celle d'un individu dans le groupe. Les activités électriques sont analysées à l'ordinateur. L'activité électrique présente des stéréotypies propres
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5

Besseau, Laurence. "L'hermaphrodisme protandre chez les sparidés : les potentialités de l'ovotestis dans le modèle Lithognathus mormyrus." Perpignan, 1991. http://www.theses.fr/1991PERP0114.

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L'etude de la sexualite du marbre, lithognathus mormyrus, est apprehendee par une analyse biometrique, sclerochronologique, histologique et cytologique d'une population du littoral mediterraneen roussillonnais. Les parametres de la croissance du marbre sont estimes par ajustement au modele de von bertalanffy. Trois types d'architecture de la sagitta (meb) sont mis en relation avec le statut sexuel des poissons. Les modalites de la gonadogenese chez l. Mormyrus sont decrites: a deux mois, la bisexualite est acquise. Chez des specimens d'un an, trois types d'ovotestis juveniles sont identifies:
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6

Graff, Christian. "Signaux électriques et comportement social du poisson à faibles décharges, Marcusenius macrolepidotus, Mormyridae, teleostei." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37598011n.

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7

Feulner, Philine. "Adaptive radiation, speciation, and reproductive isolation in African weakly electric fish : (Genus Campylomormyrus, Mormyridae, Teleostei)." Phd thesis, [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981698271.

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8

DJEBAR, A. BORHANE. "Contribution a l'etude du metabolisme du glycogene dans les cellules sensorielles d'un electrorecepteur des mormyrides (teleosteens)." Paris 6, 1986. http://www.theses.fr/1986PA066551.

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Le glycogene represente dans les cellules sensorielles des electrorecepteurs cutanes d'un normyride gnathonemus petersii, une source energetique de reserve destinee a soutenir l'autoactivite electrique de ces cellules pourvues de connexions anatomo-fonctionnelles intactes
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9

Djebar, Abdellah-Borhane. "Contribution à l'étude du métabolisme du glycogène dans les cellules sensorielles d'un électrorécepteur des mormyrides, téléosteens." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb375972020.

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10

Gebhardt, Kristina [Verfasser]. "Kommunikation mittels selbst generierter elektrischer Signale innerhalb sozialer Gruppen des schwach elektrischen Fisches Mormyrus rume / Kristina Gebhardt." Bonn : Universitäts- und Landesbibliothek Bonn, 2012. http://d-nb.info/1044846828/34.

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11

Al-Azemi, B. M. "Ultrastructural and morphometric studies on the gills of the freshwater fish Gnathonemus Petersii (family : Mormyridae) exposed to selected pollutants." Thesis, Royal Holloway, University of London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525080.

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The histopathological effects of three heavy metals, cyanide and atrazine on the gill tissues of the mormyrid fish, Gnathonemus petersii, were determined primarily by electron microscopy. Replicate samples of fish were exposed for 6 hours to acute and subacute concentrations of each toxicant in a continuous flow system comprising aerated, dechlorinated and heated water. Specific alterations to gill ultrastructure were found to be associated with each toxicant. Cadmium damage at 1.0 mg 1.1 was associated with the formation of large subepithelial spaces within the secondary lamellae and at 10.0
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12

Kaifosh, Patrick William John. "The neural circuit basis of learning." Thesis, 2016. https://doi.org/10.7916/D8416WXR.

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The astounding capacity for learning ranks among the nervous system’s most impressive features. This thesis comprises studies employing varied approaches to improve understanding, at the level of neural circuits, of the brain’s capacity for learning. The first part of the thesis contains investigations of hippocampal circuitry – both theoretical work and experimental work in the mouse Mus musculus – as a model system for declarative memory. To begin, Chapter 2 presents a theory of hippocampal memory storage and retrieval that reflects nonlinear dendritic processing within hippocampal pyr
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13

Muller, Salomon. "Learning in Multi-Layer Networks of the Brain." Thesis, 2021. https://doi.org/10.7916/d8-wh1n-c795.

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Simple circuits perform simple tasks. Complex circuits can perform more complicated tasks. This is true for artificial circuits and for brain circuits. As is known from artificial networks, a complexity that makes circuits substantially more powerful is distributing learning across multiple layers. In fact, most brain circuits in vertebrate systems are multi-layer circuits (but for few that perform simple reflexes) in which learning is distributed across layers. Despite the crucial contribution of learning in middle layer neurons to the output of the circuits they are embedded in, there is lit
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14

Feulner, Philine [Verfasser]. "Adaptive radiation, speciation, and reproductive isolation in African weakly electric fish: (Genus Campylomormyrus, Mormyridae, Teleostei) / von Philine Feulner." 2006. http://d-nb.info/981698271/34.

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15

Machnik, Peter [Verfasser]. "Allopatrische Differenzierung der Elektrokommunikation der Bulldog-Fische des südlichen Afrika (Marcusenius-macrolepidotus-Komplex, Mormyridae, Teleostei) / vorgelegt von Peter Machnik." 2009. http://d-nb.info/1005058830/34.

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16

Reis, Catarina Isabel Nogueira de Carvalho dos. "Estudo comparativo da ecologia alimentar de Pagrus pagrus L. (1758), Lithognatus mormyrus L. (1758) e Ciplodus sargus L. (1758) (Pisces, Sparidae) da costa algarvia." Master's thesis, 1998. http://hdl.handle.net/10400.1/8604.

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Dissertação de mest. em Estudos Marinhos e costeiros, Unidade de Ciências e Tecnologias dos Recursos Aquáticos, Univ. do Algarve, 1998<br>No presente estudo descreve-se a ecologia alimentar de três espécies de Sparídeos da costa Algarvia, cuja importância económica é elevada e que se encontram comercialmente ameaçadas, analisando e comparando os seus hábitos alimentares através de métodos quantitativos (coeficiente de vacuidade e índice de replecção) e métodos qualitativos (percentagem em número, frequência de ocorrência e percentagem em peso). As presas preferenciais foram determinadas pe
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