Experimental study of emergence of zooplankton in temporary water-bodies in relation to dry periods

Chatterjee, Kuhu; Gopal, Brij

doi:10.1080/03680770.1995.11900935

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…Another factor that could have induced a higher resting eggs production in July 2005 was the reduced water volume in the lagoon. Chatterjee and Gopal (1998) considered that the abundance of these resting forms in the sediment of aquatic environments was related to the environment characteristics in the absence of water. During hydrologically stressed conditions, organisms must produce a higher number of resting eggs in response to this environmental condition, and this factor could be responsible for the colonization and maintenance of the zooplankton community in the environment following the stress.…”

Section: Discussionmentioning

confidence: 99%

Resting cladoceran eggs and their contribution to zooplankton diversity in a lagoon of the Upper Paraná River floodplain

Palazzo

Bonecker²,

Fernandes

2008

Lakes & Reservoirs

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Zooplankton produce resting eggs and diapause stages as strategies to promote their survival during periods of adverse environmental conditions, thereby ensuring the community diversity. The goal of this study is to investigate the contribution of these eggs, which were present in the sediment of an isolated lagoon in the Upper Paraná River floodplain, to cladoceran diversity. The species hatching from the resting eggs in the sediment do not occur in the plankton. Sediment samples were collected at six sampling sites in the Osmar Zooplankton were sampled in the pelagic region, using a motorized pump (1000 L) and plankton net (68 μm). The pH, water temperature (°C), electrical conductivity (μS cm -1 ) and dissolved oxygen concentration (mg L -1 ) also were measured. The resting eggs were counted in the laboratory, being maintained under constant temperature and photoperiod until their analyses. The resting eggs were examined daily until hatching. A higher abundance of these eggs was observed in July, during a period of lower temperature and electrical conductivity, and higher pH and dissolved oxygen concentrations. ANOVA results indicated significant differences in resting egg abundance among the sampling months. Ceriodaphnia reticulata, Macrothrix spinosa, Ilyocryptus spinifer, Ephemeroporus tridentatus and Diaphanosoma sp. hatched from the resting eggs, although they were not observed in the plankton samples. C. reticulata was observed for the first time in this floodplain, with these study results corroborating the hypothesis that resting cladoceran eggs do contribute to zooplankton diversity in the lagoon.

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Section: Discussionmentioning

confidence: 99%

Resting cladoceran eggs and their contribution to zooplankton diversity in a lagoon of the Upper Paraná River floodplain

Palazzo

Bonecker²,

Fernandes

2008

Lakes & Reservoirs

View full text Add to dashboard Cite

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“…Both plants and invertebrates perennate through seeds, eggs and resting stages from which they emerge rapidly upon availability of water and often complete their life cycle within a short period. These adaptations are relatively well known (Williams 1987, Bonis et al 1995, Brendock et al 1998, although studies from the Asian arid regions are rare (Middleton et al 1991, Chatterjee andGopal 1998). However, even small changes in the depth, duration or timing of water availability result in significant differences in species composition of the communities in different years or adjacent habitats (Keeley andZedler 1998, Simovich 1998).…”

Section: Biodiversity Of Aquatic Habitatsmentioning

confidence: 93%