01729nas a2200193 4500008004100000245015000041210006900191300001000260490000700270520108100277653002901358653001201387653003001399653001501429653001501444653001201459100001501471856004901486 1989 eng d00aDistribution, abundance, size and feeding habits of Brienomyrus brachyistius (Gill, 1862) (Teleostei: Mormyridae) in a Nigerian rainforest stream0 aDistribution abundance size and feeding habits of Brienomyrus br a25-360 v133 a

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.

10aBrienomyrus brachyistius10aecology10aHydrometeological regimes10aIkpa River10aMormyridae10aNigeria1 aKing, R.P. uhttps://doi.org/10.26028/cybium/1989-131-00301634nas a2200217 4500008004100000245007300041210006900114260001200183300001200195490000700207520093100214100002801145700002801173700002101201700002101222700001701243700002701260700002701287700001801314856008401332 2015 eng d00aFirst insights into karyotype evolution within the family Mormyridae0 aFirst insights into karyotype evolution within the family Mormyr c11/2015 a227-2360 v393 a

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.

1 aOzouf-Costas, Catherine1 aCoutanceau, Jean-Pierre1 aBonillo, Céline1 aBelkadi, Laurent1 aFermon, Yves1 aAgnèse, Jean-Francois1 aGuidi-Rontani, Chantal1 aPaugy, Didier uhttp://sfi.mnhn.fr/cybium/numeros/2015/393/6-Ozouf%20%5B393%5D227-236%20Abs.pdf01550nas a2200181 4500008004100000245016700041210006900208260001200277300001100289490000700300520072100307653002901028653000901057653001401066653001301080100001501093856026001108 2015 eng d00aNotes on the electric organ discharges (EODs) of four Mormyrus-species (Osteoglossomorpha: Mormyridae) from the Nilo-Sahelo-Sudan ichthyofaunal province of Africa0 aNotes on the electric organ discharges EODs of four Mormyrusspec c05/2015 a3–100 v393 a

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 Forsskål, 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.

10aelectric organ discharge10aEODs10amormyrids10aMormyrus1 aMoritz, T. uhttp://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