Draft genome sequence of Exiguobacterium aurantiacum strain PN47 isolate from saline ponds, known as "Salar del Huasco", located in the Altiplano in the North of Chile

ABSTRACT In this report, we present a draft genome of 2,886,173 bp of an Exiguobacterium aurantiacum strain PN47 isolate from the sediment of a saline pond named "Salar del Huasco" in the Altiplano in the North of Chile. Strain PN47 encodes adaptive characteristics enabling survival in extreme environmental conditions of high heavy metal and salt concentrations and high alkalinity.

Influence of inlet water on the biotic and abiotic variables in a fish pond / Influência da água de entrada sobre as variáveis bióticas e abióticas em um viveiro de piscicultura

Abstract The effects of treated and untreated water inlets with macrophytes on the improvement of water quality and zooplankton community were evaluated in a fish pond with continuous water flow. Water and zooplankton samples were retrieved at four sites during nine months. There were differences (p<0.01) between inlet water from fish pond and inlet water from canal with macrophytes, featuring higher concentrations of nutrient load, mainly TAN and TP in the former. The inlet water from fish pond contained a higher number of abundant species (9 species), whilst the water supply from the canal with macrophytes had a greater richness (31 species) of zooplankton species. Results showed that inlet water without macrophytes directly affected the characteristics of the water column and the dominance of zooplankton species such as Thermocyclops decipiens, and greater abundance of Rotifera species. Since aquatic plants in the inlet water of fish pond analyzed showed lower allochthonous material loads from the previous fish pond, the management adopted with macrophytes may be applied to avoid eutrophication risks, common in farm ponds.

Resumo Os efeitos do abastecimento tratado e não tratado com macrófitas sobre a qualidade da água e comunidade zooplanctônica foram avaliados em um viveiro de piscicultura com fluxo contínuo de água. Houve maior concentração de fósforo total e nitrogênio amoniacal na água não tratada (p<0,01). Na água de entrada sem tratamento de macrófitas foi observado maior número de espécies abundantes (9 espécies), contudo, a entrada de água tratada com macrófitas apresentou maior riqueza de espécies (31 espécies) zooplanctônicas. Os resultados obtidos mostraram que a água de entrada sem macrófitas influenciou as características da coluna de água com predominância de espécies zooplanctônicas, como Thermocyclops decipiens e maior abundância de espécies de Rotifera. A água tratada com macrófita apresentou menor carga de materiais alóctones provenientes do viveiro anterior, indicando que o manejo adotado com macrófitas pode ser aplicado para evitar riscos de eutrofização, comuns em piscicultura.