Abstract
ABSTRACT We present the morphometric characteristics of Isthmochloron neustonica populations as well as their abundance and the relationship with some environmental characteristics in a fishpond. This is the first record of the species in São Paulo State and second citation to Brazil. Isthmochloron neustonica was described in neustonic habit; in this study, with sampling for phytoplankton analysis, it was found in high density and short duration blooming (time interval up to 15 days). It represented 59% of total phytoplankton density on May 26, 2010, forming a delicate and bright film on the water surface, in an environment with high concentration of nutrients and associated with drought and low temperature. The species has a restricted range in South America, probably due to their biological characteristics, such as small cell size and neustonic habit. Few records in literature can also be one of the reasons that hampers the identification of the species in subtropical environments.
Highlights
The genus Isthmochloron (Nägeli) Skuja 1948, described in Ettl (1978) and characterized by unicellular organisms, free life, strongly flattened quadrangular cells, in front view, with four concave sides, two of which more sharply constricted than the others and that divide the cell into two identical halves
Isthmochloron neustonica was described in 1993 by Zalocar & Pizarro, and the organisms were collected in a shallow artificial lake with concrete sides that worked as a landscape at the
We presented the morphometric characteristics of Isthmochloron neustonica populations as well as its density and the relationship with some environmental characteristics, documenting the first record of the species in the São Paulo State and the second record of the species in Brazil
Summary
The genus Isthmochloron (Nägeli) Skuja 1948, described in Ettl (1978) and characterized by unicellular organisms, free life, strongly flattened quadrangular cells, in front view, with four concave sides, two of which more sharply constricted than the others and that divide the cell into two identical halves. The poles are salient and sometimes ending in short spines or may be extended in furcate projections, with only a plan developed, thereby differentiating it from. The name Tribophyceae that has succeeded Xanthophyceae, mostly have planktic habit, epiphytic and some representatives in the soil microflora and a few that have adapted to neuston life (Zalocar & Pizarro 1993). Isthmochloron neustonica was described in 1993 by Zalocar & Pizarro, and the organisms were collected in a shallow artificial lake with concrete sides that worked as a landscape at the
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