Rotifer production in a shallow artificial lake (Lobo-Broa reservoir, SP, Brazil)

Abstract

Rotifer production in a shallow artificial lake (Lobo-Broa Reservoir) was studied for twenty consecutive days between August 25, 1995 and September 13, 1995, during the dry season. Two species were dominant, during this period namely Filinia pejleri and Keratella americana, contributing, respectively, 36% and 28% to total rotifer numbers. Production estimates of these species were, respectively, 41.93 and 80.70 micrograms dry weight.m-3.d-1, corresponding to 18.45 and 35.51 micrograms Cm-3.d-1. The population of F. pejleri was numerically more abundant than that of K. americana, while the production of the former was less, as a result of lower egg to female ratios.

Secondary productivity of main microcrustacean species of two tropical reservoirs in Brazil and its relationship with trophic state

“…Environmental factors also influence secondary productivity and must be considered in order to understand its variations through time: seasonality, hydrological variations, morphometric characteristics of the water body (Peláez-Rodríguez and Matsumura-Tundisi, 2002;Rietzler et al, 2004), and the interactions among species, particularly phytoplankton (available food source) and predation pressures (Melão and Rocha, 2004). The trophic state of lakes or reservoirs also can influence zooplankton productivity, where higher density and biomass of Cladocera and Copepoda were observed in eutrophic environments both in tropical and temperate regions (PintoCoelho et al, 2005;Ejsmont-Karabin and Karabin, 2013).…”

“…Several estimates of secondary productivity of tropical zooplankton have been made for large African lakes (Burgis, 1974;Hart and Allanson, 1975;Mavuti, 1994). Despite the scarcity of similar studies in Brazilian aquatic ecosystems in past decades (Rocha and Matsumura-Tundisi, 1984), the number of studies has been growing (Maia-Barbosa, 2000;Peláez-Rodríguez, and Matsumura-Tundisi, 2002;2006;Rietzler et al, 2004;Santos-Wisniewski and Rocha, 2007;Panarelli et al, 2010;Santos et al, 2010). The aim of this study was to estimate the secondary productivity rates of the main microcrustacean species of two tropical reservoirs, Três Marias and Furnas in the state of Minas Gerais (Brazil), during the dry and rainy periods.…”

Ecosystem Services of UHE Carlos Botelho (Lobo/Broa): a new approach for management and planning of dams multiple-uses

“…Several studies in this reservoir have registered the presence of many flora and fauna aquatic species, ranging from phytoplankton, zooplankton and other invertebrates to macrophytes and fishes (Peláez-Rodriguez and Matsumura- Tundisi, 2002;Pereira et. al, 2008;Dellelo, 2008;Luzia, 2009).…”

The rotifer community and its functional role in lakes of a neotropical floodplain

“…In addition, they have short life cycles and high turnover rates, thus respond rapidly to changes in environmental conditions. These characteristics contribute to their great diversity in aquatic environments [7][8][9], and play an important role in the conversion of organic matter into secondary production [10,11].…”

“…The secondary production of rotifers can be an important measurement of their functional role because it represents an estimate of the organic matter and energy available for transfer to higher trophic levels [12]. Nevertheless, studies on the effect of flooding on rotifer secondary production are lacking [11,13].…”