Huaroncocha presento una dominancia de diatomeas
pennales y centrales de mediano tamano como Encyonema sp.
Leptocylindrus minimus Navicula lyra Paralia sulcata x x x x
Pennales spp.
This pattern was previously verified for the Paranapanema River reservoir cascade and lotic stretches during summer (FERRAREZE; NOGUEIRA, 2006; NOGUEIRA et al., 2010), due to the growth of phytoplankton groups more tolerant to low light penetration, such as Cryptophyceae and
Pennales (MINEEVA et al., 2008; REYNOLDS et al., 2002).
Tambien es comun que la mayoria de las morfoespecies de diatomeas registradas sean de la forma
pennales, ya que comparada con las centricas se encuentran morfologicamente mejor adaptadas.
We collected 66 chironomid species and morphospecies belonging to the subfamilies Chironominae, Orthocladiinae and Tanypodinae (Table 2), 282 diatom species that belong to the orders Centrales and
Pennales (Table 3), 51 cladoceran species belonging to the orders Anompoda and Ctenopoda, six copepod species (Calanoida), and 29 ostracode species (Podocopina, Table 4).
The finding of a higher number of Bacillariophyceae after the waterfalls, mainly in the order
Pennales, typically benthic organisms, indicates a strong influence of the current in this sampled section (Train et ah, 2000).
Rhizosoleniaceae Rhizosolenia eriensis (Smith) Rhizosolenia gracilis (Smith)
Pennales Achnanthaceae Achnanthes lanceolata (Breb) Bacillariaceae Nitzschia palea (Kuetz) Nitzschia vermicularis (Kuetz) Eunotiaceae Eunotia sp.
En unos pocos ejemplares se observaron clorofilas filamentosas y diatomeas
Pennales.
Class 2 Bacillariophyceae (
Pennales, Pennate Diatoms)
Chrysophyta: Bacillariophyceae:
Pennales: Raphidineae: Naviculaceae: 20 genera including Navicula.