Structure and ecological aspects of zooplankton (Testate amoebae, Rotifera, Cladocera and Copepoda) in highland streams in southern Brazil

Abstract

Aim: This study aimed to characterize the zooplankton structure in highland streams in southern Brazil, Pelotas River sub-basin, as well as the respective relationships with the environmental conditions in the different seasons. Methods Zooplankton was collected using a plankton net (68 µm mesh) and concentrated into a volume of 50 ml for later analysis in the laboratory. Sampling occurred during the winter (August 2013), spring (November 2013), summer (February 2014) and autumn (May 2014). Results Rotifers and testate amoebae were the predominant groups. Mean abundance, diversity and evenness varied considerably between the different seasons. The variability of zooplankton was correlated to environmental conditions (conductivity, suspended solids, pH, temperature and dissolved oxygen). Conclusions The seasonal variation of the zooplankton community made it possible to elucidate some questions involving the ecology of these organisms in highland streams in southern Brazil. These unique ecosystems warrant further research and monitoring efforts, including studies of their hydrological patterns, biological diversity and adaptive mechanisms of the zooplankton community.

Composition and richness of monogonont rotifers from La Plata River Basin, South America

“…Knowledge of the diversity and distribution of rotifers in the Paraguay River basin is scarce and concentrated in Brazil and Argentina, including rivers in the Pantanal (Branco et al 2018, Brito et al 2020 and those joining the Paraná River (Frutos et al 2006). Similarly, few rotifer surveys have been conducted in the Uruguay River basin (e.g., José de Paggi 1978;Picapedra et al 2019).…”

Morphological characteristics of Kellicottia bostoniensis (Rousselet, 1908) (Rotifera: Brachionidae) in water bodies of the Middle Volga basin

“…16 -34. https://doi.org/10.35885/1684-7318-2021-1-16-34 ВВЕДЕНИЕ Коловратка Kellicottia bostoniensis Rousselet, 1908 -неоарктический вид, вселившийся в палеарктический регион . Вид населяет водные объекты разных стран мира, приспособлен к обитанию в широком диапазоне условий Picapedra et al, 2019). K. bostoniensis выявлена в водоёмах и водотоках Северной Европы (Eloranta, 1988;, Белоруссии , в более чем 80 водных объектах России (Иванова, Телеш, 2004;Лобуничева и др., 2011;Макарцева, Родионова, 2011;Алёшина и др., 2014;Фомина, Сярки, 2015;Подшивалина, 2016;Жихарев и др., 2020;Zdanova, Dobrynin, 2011;.…”