| ຂໍ້ສັງເກດ |
Both igarapé Macoari and igarapé Ano Bom are small, slow-current and shallow streams with clear waters, with alternating sandy and muddy substrates, abundant deposits of leaf litter on the banks and with many submerged logs and branches. The streams at the collecting localities were almost completely shaded by the forest canopy. Many fish species were found in the same stream stretch, including the log-dwelling catfishes Platydoras hancockii, Trachelyopterichthys taeniatus, Trachycorystes trachycorystes, Spinipterus cf. acsi, Tatia gyrina, T. strigata, as well as many small cichlids and characins. The rio Irua is a large blackish water river with sandy substrate and acidic waters. Ancistrus maximus was collected in the clear water streams draining to a tannin-stained larger stream and river, all connected to the large and turbid rio Branco. Ancistrus maximus has never been recorded in the sedimentloaded Anaua or Branco rivers, that constitute the main connection between the sampling sites (Ref. 103398). |