@article {665, title = {Distribution, abundance, size and feeding habits of Brienomyrus brachyistius (Gill, 1862) (Teleostei: Mormyridae) in a Nigerian rainforest stream}, journal = {Cybium}, volume = {13}, year = {1989}, pages = {25-36}, chapter = {25}, abstract = {

Brienomyrus brachyistius (Gill, 1862) constitutes 64\% of the total number of all mormyrid species caught from the upper and middle reaches of Ikpa River in the rainforest zone of south-eastern Nigeria. It inhabits shallow marginal areas and swamp-pools with aquatic macrophytes. B. brachyistius\ feeds primarily on benthic invertebrates (with chironomid larvae predominating), algae, detritus and secondarily on zooplankton, miscellaneous invertebrates and mud/sans; allochthonous invertebrates and macrophyte material are of incidental importance. The diet varies slightly with growth and season. Feeding activity is higher in the small-sized guild (\< 10 cm TL) than large-sized guild (\≥ 10 cm TL); it is intense at night but declines during the day and is higher in the dry season than during the rains. Seasonal fluctuations in hydrometeorological regimes (rainfall, water level, flow rate) are critical factors that affect the food and feeding habits of the fish; flood has a depressive influence on food variety and feeding intensity.

}, keywords = {Brienomyrus brachyistius, ecology, Hydrometeological regimes, Ikpa River, Mormyridae, Nigeria}, doi = {10.26028/cybium/1989-131-003}, url = {https://doi.org/10.26028/cybium/1989-131-003}, author = {King, R.P.} } @article {479, title = {First insights into karyotype evolution within the family Mormyridae}, journal = {Cybium}, volume = {39}, year = {2015}, month = {11/2015}, pages = {227-236}, chapter = {227}, abstract = {

The chromosomal diversity within six species of Mormyridae belonging to six different genera (Gnathonemus petersii, Marcusenius moorii, Ivindomyrus obdenboschi, Brienomyrus sp., Stomatorhinus walkeri and Petrocephalus microphthalmus) is investigated for the\  rst time. These species have a conserved diploid chromosome number of 2n = 50 (except G. petersii 2n = 48) but different chromosome formulae, essentially involving pericentric inversions. C-banding has been used for the localization of heterochromatin. for a deeper interspeci c comparison, several molecular markers were localized in the chromosomes by\  uorescence in situ hybridization (fisH): a 18s rdna probe; a microsatellite probe (gaa)10, and a telomeric probe (ttaggg)7. The distribution of the 18S rDNA patterns, in particular, shows an amazing speci c diversity, con rming a rapid radiation accompanied by major chromosome rearrangements.

}, url = {http://sfi.mnhn.fr/cybium/numeros/2015/393/6-Ozouf\%20\%5B393\%5D227-236\%20Abs.pdf}, author = {Ozouf-Costas, Catherine and Coutanceau, Jean-Pierre and Bonillo, C{\'e}line and Belkadi, Laurent and Fermon, Yves and Agn{\`e}se, Jean-Francois and Guidi-Rontani, Chantal and Paugy, Didier} } @article {464, title = {Notes on the electric organ discharges (EODs) of four Mormyrus-species (Osteoglossomorpha: Mormyridae) from the Nilo-Sahelo-Sudan ichthyofaunal province of Africa}, journal = {Cybium}, volume = {39}, year = {2015}, month = {05/2015}, pages = {3{\textendash}10}, chapter = {3}, abstract = {

Field studies on the electric organ discharges (EODs) of Mormyrus species are rare, likely due to their biology hindering live capture in large numbers. Here the EODs of four Nilo-Sahelo-Sudanic species, Mormyrus caschive Linnaeus, 1758, M. kannume Forssk\ål, 1775, M. hasselquistii Valenciennes, 1847 and M. rume Valenciennes,1847, are compared and discussed. Their discharges are largely equal to each other, mainly showing differences in length and peak of Fourier transformation with less pronounced differences in the relative amplitude of phases within an EOD. The discharge properties allow species discrimination, at least within eco-regions, and thus likely play a role in species recognition.

}, keywords = {electric organ discharge, EODs, mormyrids, Mormyrus}, url = {http://www.researchgate.net/profile/Timo_Moritz/publication/276247346_Notes_on_the_electric_organ_discharges_(EODs)_of_four_Mormyrus-species_(Osteoglossomorpha_Mormyridae)_from_the_Nilo-Sahelo-Sudan_ichthyofaunal_province_of_Africa/links/5553180908ae6943a}, author = {Moritz, T.} }