The relationship between the water level of the Amazon River and the fate of the zooplankton population in lago Jacaretinga. A Várzea Lake in the Central Amazon∗

Brandorff, Gerd-Oltmann; Andrade, Elsa Rodrigues de

doi:10.1080/01650527809360533

Cited by 37 publications

(21 citation statements)

References 2 publications

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“…Hamilton et al (1990) detected a decrease in zooplankton densities in lakes located in the Orinoco River's floodplain during the high water period; a possible consequence of this increased water volume is a dilution effect. This conclusion was also found by Brandorff and Andrade (1978) in Jacaretinga Lake. A dilution effect, however, was not detected in this study.…”

Section: Seasonal Differences In Species Richness and Abundancesupporting

confidence: 75%

Composition, species richness and patterns of nycthemeral vertical distribution of planktonic cladocereans in a black water Amazonian lake

Ghidini

Santos-Silva

2011

Nauplius

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The aim of this study was to identify patterns of vertical distribution of planktonic cladocerean populations throughout the diel cycle, during the low and high water periods, and its ecological implications for a black water Amazonian lake. Tupé Lake is a black water lake located near the Brazilian city of Manaus. A channel links the lake with the Negro River and its flood pulse. This study was performed in a low-water period (November 2005) and in a high-water period (June 2006). Samples were taken on a 24-hour cycle, every 4 hours and at each meter of the water column, using a Schindler-Patalas trap equipped with a 55µm size mesh. A total of 16 species were registered during the low water period, wherein Bosminopsis deitersi, Moina minuta, and Ceriodaphnia cornuta were the most abundant species. B. deitersi migrated to the bottom during the afternoon, while M. minuta, Moina reticulata, and Holopedium amazonicum remained at the bottom for the entire diel cycle. During the high-water period, a total of 18 species were observed, and B. deitersi, C. cornuta, and Diaphanosoma polyspina were the most abundant species. During both sampling periods, no pattern was detected for C. cornuta. Generally, vertical patterns of distribution were less evident in the high water period, due to the mixing of the lake.

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Section: Seasonal Differences In Species Richness and Abundancesupporting

confidence: 75%

Composition, species richness and patterns of nycthemeral vertical distribution of planktonic cladocereans in a black water Amazonian lake

Ghidini

Santos-Silva

2011

Nauplius

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“…comm. ), and there may be an influx of planktivorous fish from the river during inundation as has been observed in the Amazon (Brandorff and Andrade 1978). No quantitative estimate exists for the effect of fish on zooplankton abundance in the Orinoco floodplain, however.…”

Section: Rivermentioning

confidence: 92%

Zooplankton abundance in the lower Orinoco River, Venezuela

Saunders

Lewis

1989

Limnology & Oceanography

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Zooplankton were sampled quantitatively in the lower Orinoco River and three major tributaries (Apure, Caura, Caroni). Dominant taxa were euplanktonic, which suggests origin from standing waters. In the Orinoco, densities for rotifers (mean, 7.6 ind. liter -I) were greater than those for cladocerans (0.9 ind. liter-I) or copepods (1.2 ind. liter-'), but cladocerans accounted for more than half oftotal biomass (0.5 kg C liter -I). Average tributary contributions to zooplankton transport in the lower Orinoco (873 kg C d-l) were proportional to their average discharges. Extensive fringing floodplain along the lower Orinoco contributed very little to total transport. At low water in the Orinoco, when there was no contact with the floodplain, the transport of copepods (mainly nauplii) and Bosmina increased downstream by more than could be ascribed to additions from the tributaries or to reproduction in transit. These zooplankton appear to originate along the river margin, within the channel, and arc probably significant as an energy input for food webs in the channel and as an inoculum to floodplain habitats at the time of inundation.

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“…Studies performed in South American floodplain systems have found higher abundances of some zooplanktonic species during dry periods or limnophase (Brandorff & Andrade 1978, Saunders & Lewis Jr. 1989, Paggi & De Paggi 1990, Lansac-Tôha et al 1993, Lima et al 1998, Rossa & Bonecker 2003, De Paggi & Paggi 2007Henry et al 2011), when the hydrodynamic conditions were more stable, thus promoting primary productivity which supports large populations of zooplanktonic organisms due to higher water residence time (Baranyi et al 2002). In contrast, during potamophase, we observed a dilution effect in which organisms were more dispersed in the water column (Bozelli 2000, Lansac-Tôha et al 2009).…”

Section: Macrothrix Elegans Sars 1901 Copepodamentioning

confidence: 99%

Intra and inter-annual structure of zooplankton communities in floodplain lakes: a long-term ecological research study

Simões

Lansac‐Tôha

Velho

et al. 2012

RBT

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Abstract:Water flow management has significantly changed the natural dynamic of floods, which are responsible for the structure and dynamic of aquatic communities in river-floodplain systems. With the aim to elaborate a conceptual framework that describes the main ecological factors associated with zooplankton community structure in the Upper Paraná River, we investigated the mechanisms that regulate the communities structure and their response to inter-annual and hydro-sedimentological variations in the floodplain and the biological factors associated with species abundance in those communities. For this we conducted samplings every six months (potamophase in March and limnophase in September) to characterize intra and inter-annual variations in community structure between 2000 and 2008. The intra-annual differences on the species richness, abundance, Shannon diversity index, and evenness, were conducted using Bayesian procedures to show probabilistic predictions of the data fit to main variation sources. Non-metric multi-dimensional scaling (NMDS), multi-response permutation procedure (MRPP), and indicator species analysis (IndVal) were run to assess and characterize the seasonality of the community structure. During high water (potamophase), hydrologic connectivity favoured exchange and dispersal of species in some lakes, increasing local diversity; during low water (limnophase), higher local productivity favoured opportunistic taxa, increasing species dominance and decreasing local diversity. Food resources and density of small-size fish were biological factors associated with the seasonal dynamic of the zooplankton community; these factors were dependent on hydrosedimentological phase (potamophase or limnophase). Water levels and limnological modifications related to water flow management have promoted replacement and impoverishment of aquatic biota in affected lakes and have indicated the ecological importance of a natural dynamic flood, which displays regular flood pulses. The conceptual model presented encompassed interactions between diverse environmental variables to more understandable mechanisms of the main sources of community variation. Rev. Biol. Trop. 60 (4): 1819-1836. Epub 2012 December 01.

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The relationship between the water level of the Amazon River and the fate of the zooplankton population in lago Jacaretinga. A Várzea Lake in the Central Amazon∗

Cited by 37 publications

References 2 publications

Composition, species richness and patterns of nycthemeral vertical distribution of planktonic cladocereans in a black water Amazonian lake

Composition, species richness and patterns of nycthemeral vertical distribution of planktonic cladocereans in a black water Amazonian lake

Zooplankton abundance in the lower Orinoco River, Venezuela

Intra and inter-annual structure of zooplankton communities in floodplain lakes: a long-term ecological research study

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