Life history, biomass and production of Coronatella rectangula (Branchiopoda, Anomopoda, Chydoridae) from Minas Gerais

Abstract

ABSTRACT. Species of Chydoridae provide the main diversity of the Cladocera. These organisms have been the subject of many studies; some dealing with their role in energy flow in aquatic ecosystems, since they inhabit the littoral region of water bodies which undergo the first impacts from anthropic activities. The aim of this study is to increase knowledge about the life cycle of Coronatella rectangula (Sars, 1861), a species found in several water bodies in the state of Minas Gerais, Brazil. The life cycle was determined by the culture of parthenogenetic females under controlled conditions in the laboratory. Experimental cultures were maintained in growth chambers at a constant temperature of 23.6(±0.5)°C, through a 12 h light/12 h dark photoperiod. The organisms were fed on a suspension of Pseudokirchneriella subcapitata (Chlorophyceae) (10 5 cells.mL -1 ), and 0.02 mL of a mixed suspension of yeast and fish ration added per organism in equal proportions (1:1). Fifty parthenogenetic females with eggs were isolated and maintained until they produced neonates. Thirty of these neonates that had less than 24 hours were put in polypropylene bottles of 50 mL and kept in a germination chamber. These organisms were observed daily to obtain the parameters of the life cycle. Biomass and secondary production were also calculated. The embryonic development time of the specimens of C. rectangula was 1.68(±0.13) days and the time to reach primipara, was 2.48(±0.45) days. The mean fecundity of C. rectangula was two eggs/female/brood and the total number of eggs produced by the female during its life cycle was 27.8 eggs. During the whole life cycle, specimens of C. rectangula had a maximum of 14 seedlings, with two instars in the juvenile stage. for the juvenile stage).

Life history and DNA barcode of Oxyurella longicaudis (Birgei, 1910) (Cladocera, Anomopoda, Chydoridae)

“…A. harpae, Alonella excisa, Leydigia acanthocercoides, and A. iheringula reached maturity on the third day of life (Melão 1997;Sharma and Sharma 1998;Murugan and Job 1982;Silva et al 2014), and C. rectangula reaches primipara age on the second day of life (Viti et al 2013) (Table 3) growth ( Figure 2). Therefore, the species began to allocate energy for reproduction only from this period onward, which is indicated by the increase of O. longicaudis' body, being larger than most representatives of the Chydoridae family.…”

“…Ecotoxicology studies aim to control the environmental quality and the ability of zooplankton organisms to swim against a gradient of turbulence (Seuront et al 2004;Santos-Wisniewski et al 2002;Freitas and Rocha 2006;Castilho et al 2012). In Brazil, studies on the life cycle of Chydoridae have been done on species such as Chydorus dentifer and Acroperus harpae, Chydorus pubescens, Coronatella rectangula, and Alona iheringula by Melão (1997), Santos-Wisniewski et al (2006), Viti et al (2013), and Silva et al (2014), respectively. High variation was observed in their life cycle, with a duration average varying between 9 and 46 days, with the greatest longevity recorded for A. iheringula cultured at 25°C.…”

Alona kaingang (Crustacea, Cladocera, Aloninae): a new species of the pulchella-group, with identification key to Neotropical species

“…Under low magnification, the postabdomen of A. kaingang sp. nov. resembles C. rectangula (= Alona rectangula), and many records of this species in Brazil (see Green 1972;Santos et al 1994;Smirnov and Santos-Silva 1995;Eskinazi-Sant' Anna et al 2005;Sterza and Fernandes 2006;Rocha et al 2011;Viti et al 2013) perhaps may be attributed to new species of the pulchella-group described here; this, however, needs to be checked.…”

“…Thus, A. kaingang sp. nov., having a complete connection between the main head pores, could be differentiated from species belonging to do the first group: Alona capensis (Rüher, 1914) Rocha et al 2011), including the Furnas Reservoir (Santos et al 1994;Viti et al 2013). The review of Coronatella in Brazil confirmed that C. rectangula does not occur in Brazil, and probably not in the Neotropics (Sousa et al 2015).…”

Alona iheringula Sinev & Kotov, 2004 (Crustacea, Anomopoda, Chydoridae, Aloninae): Life Cycle and DNA Barcode with Implications for the Taxonomy of the Aloninae Subfamily

“…In Brazil, the life cycle of C hydorus dentifer and Acroperus harpae was analysed by Melão [13], Chydorus pubescens by Santos-Wisniewski et al [22] and Coronatella rectangula by Viti et al [23].…”