Roland Pusch, Vanessa Kassing, Ursula Riemer, Hans‐Joachim Wagner, Gerhard von der Emde, Jacob Engelmann,
... important roles for survival. The visual system of Gnathonemus petersii, a member of the family mormyridae living ... temporal transfer properties of the visual system of Gnathonemus. To do so, we analyzed visual evoked potentials ... frequency in a behavioral paradigm. Results obtained in Gnathonemus are compared to results obtained with goldfish (Carassius ... systems: While goldfish responds best to low frequencies, Gnathonemus responds best at higher frequencies. The visual system ... low-pass filter while the visual system of Gnathonemus has characteristics of a band-pass filter. Furthermore ...
Tópico(s): Fish Biology and Ecology Studies
2012 - Elsevier BV | Journal of Physiology-Paris
Martin Gottwald, Neha Singh, André N Haubrich, Sophia Regett, Gerhard von der Emde,
... 39) Google Scholar]. Similarly, nocturnal, weakly electric fish Gnathonemus petersii might rely on “electric colors” [8Budelli R. ... permit capacitance measurement in a weakly electric fish, Gnathonemus petersii.J. Comp. Physiol. A Neuroethol. Sens. Neural ... S. Imaging of objects through active electrolocation in Gnathonemus petersii.J. Physiol. Paris. 2002; 96: 431-444Crossref ... S. Imaging of objects through active electrolocation in Gnathonemus petersii.J. Physiol. Paris. 2002; 96: 431-444Crossref ... of capacitive objects in the weakly electric fish Gnathonemus petersii.J. Exp. Biol. 2017; 220: 3142-3153Crossref ...
Tópico(s): Ichthyology and Marine Biology
2018 - Elsevier BV | Current Biology
Mario F. Wullimann, R. Glenn Northcutt,
... on the telencephalic and tectal connections, specifically in Gnathonemus petersii, as these data are critical for an ... of retinal, cerebellar, tectal, and telencephalic connections in Gnathonemus with those in nonelectrosensory teleosts reveals several points: ( ... area of the diencephalon is highly reduced in Gnathonemus, (2) the interconnections between the preglomerular area and telencephalon in Gnathonemus are unusually well developed compared to those in ... related to electroreception. The preglomerulo-cerebellar connections in Gnathonemus are therefore interpreted as uniquely derived characters for ...
Tópico(s): Retinal Development and Disorders
1990 - Wiley | The Journal of Comparative Neurology
Meik Landsberger, Gerhard von der Emde, Dorothee Haverkate, Stefan Schuster, Janina Gentsch, Elke Ulbricht, Andreas Reichenbach, F. N. Makarov, Hans‐Joachim Wagner,
The African weakly electric fish Gnathonemus petersii is well known for its electrosensory capabilities. These animals can detect and distinguish objects through active electrolocation in complete darkness. ... experiments indicate that motion vision is important for Gnathonemus, narrowing down the search for the functional specialization of the Gnathonemus retina and providing a starting point for work ...
Tópico(s): Neurobiology and Insect Physiology Research
2008 - Elsevier BV | Journal of Physiology-Paris
J. Meek, H.W.J. Joosten, Harry W.M. Steinbusch,
... highly developed brain of the weakly electric fish Gnathonemus petersii. In the telencephalon, dopamine‐containing cell bodies ... cerebellum and the electrosensory lateral line lobe of Gnathonemus , did not contain detectable amounts of dopamine. In ... of the high differentiation of the brain of Gnathonemus , the distribution of catecholamines as visualized with dopamine ...
Tópico(s): Physiological and biochemical adaptations
1989 - Wiley | The Journal of Comparative Neurology
Gyula Lázár, S. Libouban, Thomas L. Szabo,
... retinal projections were studied in a mormyrid fish, Gnathonemus petersii , by using Fink‐Heimer, HRP, cobalt labeling, ... fibers could be detected. The visual system of Gnathonemus is compared to that of other fishes, amphibians, ... that the visual system is less developed in Gnathonemus. This nocturnal species lives in turbid waters and ...
Tópico(s): Retinal Development and Disorders
1984 - Wiley | The Journal of Comparative Neurology
G Bässler, Reinhard Hilbig, H. Rahmann,
... circadianen Rhythmik der elektrischen und motorischen Aktivität von Gnathonemus petersii (Mormyridae, Pisces) Dipl. biol. Gerhard Bässler, Corresponding ... electric activity were performed with the electric fish Gnathonemus petersii. A group of 11 conspecifics as well ... H. Rahmann (1978): Elektrische und motorische Aktivität von Gnathonemus petersii nach künstlicher elektrischer Stimulation. Zool. Jb. Physiol. ... Electric organ discharge activity of resting and stimulated Gnathonemus petersii (Mormyridae). Behaviour 50, 306–323. 10.1163/ ...
Tópico(s): Physiological and biochemical adaptations
2010 - Wiley | Zeitschrift für Tierpsychologie
Julia Canitz, Frank Kirschbaum, Ralph Tiedemann,
... sister taxon of the genus Campylomormyrus, i.e., Gnathonemus petersii (2n=48). These results support the close relationship of Campylomormyrus and Gnathonemus. However, the karyotype formula of C. compressirostris is different from Gnathonemus petersii, thereby confirming the high variability of karyotype ...
Tópico(s): Chromosomal and Genetic Variations
2016 - Elsevier BV | Journal of Physiology-Paris
Jacob Engelmann, Sabine Nöbel, Timo Röver, Gerhard von der Emde,
... A well studied example is the elephantnose fish, Gnathonemus petersii, which has a characteristic and unique elongated ... is mediated by the active electric sense of Gnathonemus petersii. This response will allow a detailed analysis ...
Tópico(s): Fish Ecology and Management Studies
2009 - BioMed Central | Frontiers in Zoology
Christian Graff, Gwenaël Kaminski, Michael A. Gresty, Théophile Ohlmann,
... permit capacitance measurement in a weakly electric fish, Gnathonemus petersii.J. Comp. Physiol. [A]. 1992; 171: 683- ... electric fish physical images of resistive objects in Gnathonemus petersii.J. Exp. Biol. 1998; 201: 2115-2128PubMed ... during active electrolocation in mormyrid weakly-electric fishes (Gnathonemus petersii).Philos. Trans. R. Soc. Lond. B Biol. ...
Tópico(s): Fish Ecology and Management Studies
2004 - Elsevier BV | Current Biology
B. M. Alazemi, J.W. Lewis, Elizabeth B. Andrews,
... on the gill tissues of the mormyrid fish, Gnathonemus petersii, were determined primarily by electron microscopy. Replicate ... damage to the surface of fish gills. Keywords: Gnathonemus petersiifish gillspollutionelectron microscopy
Tópico(s): Fish Ecology and Management Studies
1996 - Taylor & Francis | Environmental Technology
J. Meek, H.W.J. Joosten, Theo Hafmans,
... immunoreactivity in the brain of the mormyrid fish Gnathonemus petersii was studied in order to evaluate the ... cells have been described only in the teleost Gnathonemus petersii and the lizard Gekko gecko (Smeets and ...
Tópico(s): Zebrafish Biomedical Research Applications
1993 - Wiley | The Journal of Comparative Neurology
J. Meek, Theo Hafmans, Leonard Maler, Richard Hawkes,
... in two other teleosts, the electric mormyrid fish Gnathonemus petersii with its large and regularly built gigantocerebellum, ... eurydendroid projection neurons, are zebrin II‐negative. In Gnathonemus , zebrin II‐positive Purkinje cells are present in ...
Tópico(s): Retinal Development and Disorders
1992 - Wiley | The Journal of Comparative Neurology
Robert E. Landsman, Cheryl F. Harding, Peter Möller, P. John Thomas,
... morphology and electric organ discharge (EOD) waveform in Gnathonemus petersii, a weakly discharging electric fish, were investigated. ... first to show that the external morphology in Gnathonemus petersii is androgen-dependent. The result are discussed ...
Tópico(s): Fish Ecology and Management Studies
1990 - Elsevier BV | Hormones and Behavior
... highly developed brain of the weakly electric fish Gnathonemus petersii with the aid of specific antibodies against ... belong to the paraventricular organ (PVO), which in Gnathonemus is located around a number of small infundibular ...
Tópico(s): Neurobiology and Insect Physiology Research
1989 - Wiley | The Journal of Comparative Neurology
J. Meek, Rudolf Nieuwenhuys, D. Elsevier,
... highly developed cerebellum of the weakly electric fish Gnathonemus petersi is differentiated into four lobes, numbered C ... small cells in the dorsal midbrain tegmentum. In Gnathonemus this nucleus encompasses nine subdivisions, of which the ...
Tópico(s): Physiological and biochemical adaptations
1986 - Wiley | The Journal of Comparative Neurology
... monitor was developed using the weakly electric fish, Gnathonemus petersi, as the test organism. The test system ... either alternatively or simultaneously. The toxicity response of Gnathonemus petersi was measured in experiments with the toxicants ...
Tópico(s): Electrochemical Analysis and Applications
1984 - Elsevier BV | Water Research
... organ discharges (EOD) of the African elephant fish Gnathonemus (family Mormyridae) to produce counts of pulses per ... ambient of 27° C. Keywords: Electric organ activity Gnathonemus temperature
Tópico(s): Fish Ecology and Management Studies
1991 - Taylor & Francis | Environmental Technology
Petra Horká, Veronika Langová, Jan Hubený, Karel Valeš, Ivana Chrtková, Jiřı́ Horáček,
... results of an OFT for weakly electric fish Gnathonemus petersii. This study aimed to describe the behavioral ...
Tópico(s): Fish Ecology and Management Studies
2024 - Frontiers Media | Frontiers in Behavioral Neuroscience
Sarah Nicola Jung, Silke Künzel, Jacob Engelmann,
... on spatial learning in the weakly electric fish Gnathonemus petersii. During their nocturnal excursions these fish typically ...
Tópico(s): Ichthyology and Marine Biology
2019 - Elsevier BV | Animal Behaviour
Federico Pedraja, Volker Hofmann, Julie Goulet, Jacob Engelmann,
... we investigate how the weakly electric mormyrid fish Gnathonemus petersii of undetermined sex structure their sensing and ... We characterized how the weakly electric mormyrid fish Gnathonemus petersii, as it learns a perceptual task, restructures ...
Tópico(s): Advanced Memory and Neural Computing
2019 - Society for Neuroscience | Journal of Neuroscience
Sarah Schumacher, Gerhard von der Emde, Theresa Burt de Perera,
... navigation. Here we used the weakly electric fish Gnathonemus petersii to investigate how different sensory inputs influence ...
Tópico(s): Marine animal studies overview
2017 - Elsevier BV | Animal Behaviour
Martin Gottwald, Raya A. Bott, Gerhard von der Emde,
During active electrolocation the weakly electric fish Gnathonemus petersii judges distance and impedance of nearby objects. Capacitive objects, which modulate local amplitude and waveform of the fish's electric probing signals, ...
Tópico(s): Ichthyology and Marine Biology
2017 - The Company of Biologists | Journal of Experimental Biology
Sarah Schumacher, Theresa Burt de Perera, Gerhard von der Emde,
... during object discrimination in the weakly electric fish Gnathonemus petersii. Fish were trained to discriminate between two ...
Tópico(s): Marine animal studies overview
2017 - Nature Portfolio | Scientific Reports
Volker Hofmann, Juan Ignacio Sanguinetti-Scheck, Leonel Gómez‐Sena, Jacob Engelmann,
... actively created during highly patterned, spontaneous behavior in Gnathonemus petersii. The spatiotemporal structure of the sensory input ... properties of the active pulsatile electrolocation system in Gnathonemus petersii allow for the sensory input to be ...
Tópico(s): Fish Ecology and Management Studies
2016 - Society for Neuroscience | Journal of Neuroscience
Monique Amey‐Özel, Gerhard von der Emde, Jacob Engelmann, Kirsty Grant,
ABSTRACT The weakly electric fish Gnathonemus petersii uses its electric sense to actively probe the environment. Its highly mobile chin appendage, the Schnauzenorgan, is rich in electroreceptors. ...
Tópico(s): Advanced Memory and Neural Computing
2014 - Wiley | The Journal of Comparative Neurology
Roland Pusch, Hans‐Joachim Wagner, Gerhard von der Emde, Jacob Engelmann,
The retina of the weakly electric fish Gnathonemus petersii is a so-called grouped retina where photoreceptors are bundled. These bundles are regarded as functional units and this type of retinal ...
Tópico(s): Visual perception and processing mechanisms
2013 - Wiley | The Journal of Comparative Neurology
Katharina Fechler, Gerhard von der Emde,
The weakly electric fish Gnathonemus petersii uses active electrolocation to detect and discriminate between objects in its environment. Objects are recognised by analysing the electric ...
Tópico(s): Fish Ecology and Management Studies
2012 - Elsevier BV | Journal of Physiology-Paris
Gerhard von der Emde, Monique Amey, Jacob Engelmann, Steffen Fetz, Caroline Folde, Michael Hollmann, Michael G. Metzen, Roland Pusch,
... even in complete darkness. The African mormyrid fish Gnathonemus petersii can not only detect nearby objects, but ...
Tópico(s): Ichthyology and Marine Biology
2008 - Elsevier BV | Journal of Physiology-Paris
Martijn M. de Ruiter, Chris I. De Zeeuw, Christian Hansel,
... conductances in Purkinje cells of the mormyrid fish Gnathonemus petersii. Various types of Na+ channel alpha-subunits, ... mediate fast inactivating and resurgent Na+ currents in Gnathonemus Purkinje cells, we conducted patch-clamp recordings in ...
Tópico(s): Advanced Memory and Neural Computing
2006 - American Physiological Society | Journal of Neurophysiology