TY  - JOUR
A1  - Nguyen, Manh Duy Linh
A1  - Mamonekene, Victor
A1  - Vater, Marianne
A1  - Bartsch, Peter
A1  - Tiedemann, Ralph
A1  - Kirschbaum, Frank
T1  - Ontogeny of electric organ and electric organ discharge in Campylomormyrus rhynchophorus (Teleostei: Mormyridae)
JF  - Journal of comparative physiology; A, Neuroethology, sensory, neural, and behavioral physiology
N2  - The aim of this study was a longitudinal description of the ontogeny of the adult electric organ of Campylomormyrus rhynchophorus which produces as adult an electric organ discharge of very long duration (ca. 25 ms). We could indeed show (for the first time in a mormyrid fish) that the electric organ discharge which is first produced early during ontogeny in 33-mm-long juveniles is much shorter in duration and has a different shape than the electric organ discharge in 15-cm-long adults. The change from this juvenile electric organ discharges into the adult electric organ discharge takes at least a year. The increase in electric organ discharge duration could be causally linked to the development of surface evaginations, papillae, at the rostral face of the electrocyte which are recognizable for the first time in 65-mm-long juveniles and are most prominent at the periphery of the electrocyte.
KW  - Weakly electric fish
KW  - Development
KW  - Electric organ discharge
KW  - Electric
KW  - organ
KW  - Electrocyte features
Y1  - 2020
U6  - https://doi.org/10.1007/s00359-020-01411-z
SN  - 0340-7594
SN  - 1432-1351
VL  - 206
IS  - 3
SP  - 453
EP  - 466
PB  - Springer
CY  - Berlin ; Heidelberg
ER  - 
TY  - JOUR
A1  - Nagel, Rebecca
A1  - Kirschbaum, Frank
A1  - Tiedemann, Ralph
T1  - Electric organ discharge diversification in mormyrid weakly electric fish is associated with differential expression of voltage-gated ion channel genes
JF  - Journal of comparative physiology : A, Neuroethology, sensory, neural, and behavioral physiology
N2  - In mormyrid weakly electric fish, the electric organ discharge (EOD) is used for species recognition, orientation and prey localization. Produced in the muscle-derived adult electric organ, the EOD exhibits a wide diversity across species in both waveform and duration. While certain defining EOD characteristics can be linked to anatomical features of the electric organ, many factors underlying EOD differentiation are yet unknown. Here, we report the differential expression of 13 Kv1 voltage-gated potassium channel genes, two inwardly rectifying potassium channel genes, two previously studied sodium channel genes and an ATPase pump in two sympatric species of the genus Campylomormyrus in both the adult electric organ and skeletal muscle. Campylomormyrus compressirostris displays a basal EOD, largely unchanged during development, while C. tshokwe has an elongated, putatively derived discharge. We report an upregulation in all Kv1 genes in the electric organ of Campylomormyrus tshokwe when compared to both skeletal muscle and C. compressirostris electric organ. This pattern of upregulation in a species with a derived EOD form suggests that voltage-gated potassium channels are potentially involved in the diversification of the EOD signal among mormyrid weakly electric fish.
KW  - Weakly electric fish
KW  - Ion channels
KW  - Electric organ
KW  - Gene expression
KW  - Campylomormyrus
Y1  - 2017
U6  - https://doi.org/10.1007/s00359-017-1151-2
SN  - 0340-7594
SN  - 1432-1351
VL  - 203
SP  - 183
EP  - 195
PB  - Springer
CY  - New York
ER  -