Figure 13 in Allopatric differentiation in the Marcusenius macrolepidotus species complex in southern and eastern Africa: the resurrection of M. pongolensis and M. angolensis, and the description of two new species (Mormyridae, Teleostei)

Figure 13. The amplitude of the head-negative phase of an EOD (Namp re: Pamp51; dimension: Volt) decreases with fish size in M. pongolensis (heavy lines) according to a least-squares regression line. The lines for males (M) and females (including some small juveniles the sex of which could not be determined; F,J) are similar; they differ neither in slope nor in elevation (P.0.05). First sample: %, 11 males; %, 15 females (including four juveniles of indeterminate sex). Second sample: $, four males; &, 11 females and juveniles. Third sample: V, 19 males; e, four females. Hairline regressions, for female (including juvenile, F,J(Z)) and male M. altisambesi (M(Z)). No data points shown for M. altisambesi. A male M. pongolensis ($) of 14.4 cm SL is also shown 18 months after capture, when reproducing in aquarium (m, arrow, not included in regression analyses). Open triangles, M. pongolensis from the Limpopo System (Lim; N511). 6, M. pongolensis from the KwaMaZulu stream (KMZ; N57) of the Mhlatuze System. %, M. pongolensis from the Pongola River (Pon; N510).