Longitudinal patterns of phytoplankton distribution in a tributary bay under reservoir operation

Wang, Lan; Cai, Qinghua; Zhang, Min; Tan, Lu; Kong, Linghui

doi:10.1016/j.quaint.2010.09.012

Cited by 24 publications

(17 citation statements)

References 35 publications

(24 reference statements)

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“…For instance, at 3-transitional, the total biomass was the highest, with Dinophyta accounting for a marked proportion, while Bacillariophyta accounted for a large proportion of the total biomass at 4-riverine. These mentioned characteristics of 3-transitional and 4-riverine agreed with the conclusions of their zonation (located in transitional zone and riverine zone, respectively) proposed by WANG et al (2010b). The obvious difference of phytoplankton community structure at 4-riverine from the other sites showed the great impact of inflow from the upstream of Xiangxi Bay.…”

Section: Discussionsupporting

confidence: 86%

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Longitudinal Differences of Phytoplankton Community during a Period of Small Water Level Fluctuations in a Subtropical Reservoir Bay (Xiangxi Bay, Three Gorges Reservoir, China)

Wang

Cai

Tan

et al. 2011

International Review of Hydrobiology

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The Three Gorges Reservoir (TGR) had a great inflow discharge with small water level fluctuations in the flood season of the year 2008, when a large-scale cyanobacterial bloom broke out in Xiangxi Bay (a tributary bay behaving like a lake) for the first time after the construction of the TGR impoundment. To compare spatiotem poral longitudinal differences of phytoplankton community structure during this period, weekly surveys were performed in Xiangxi Bay. The cyanobacterial bloom lasted from June 6 to July 18, 2008, with Microcystis aeruginosa as the dominant species. During this bloom the species diversity, evenness and community change rate was relatively low. The probable causes for the interruption of the bloom were precipitation and water temperature. In the non-cyanobacterial bloom period (July 25 to September 26, 2008) many other species dominated the community including Stephanodiscus hantzschii and Cryptomonas ovata, with higher values of species diversity, evenness and community change rate. As for the longitudinal differences, the community structure in the riverine zone was different from that in other zones, indicating the important effect of inflow from the upstream of Xiangxi Bay. The management actions in Xiangxi Bay should prevent blooms in the mainstream, lacustrine and transitional zone. IntroductionPhytoplankton composition can be recognized as a natural bioindicator because of its complex and rapid responses to fluctuations of environmental conditions (L IVINGSTON, 2001). Phytoplankton community composition changes as a consequence of species succession, which occurs in response to new environmental conditions (ÁLVAREZ-GÓNGORA and HERRE- RA-SILVEIRA, 2006). Two important factors appear to control the phytoplankton community structure, as well as the species succession. The first one is related to physical processes such as mixing conditions, light, temperature, turbulence, and salinity; and the second one is associated with nutrients (YUSOFF et al., 2002;NUCCIO et al., 2003;DOMINGUES et al., 2005;ÁLVAREZ-GÓNGORA and HERRERA-SILVEIRA, 2006;BROGUEIRA et al., 2007;DOMINGUES et al., 2007).

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Section: Discussionsupporting

confidence: 86%

“…2b). The estimated inflow charge of Xiangxi Bay in the study period was 63.22 m 3 /s (WANG et al, 2010b). Water temperature (Fig.…”

Section: Physical and Chemical Conditionsmentioning

confidence: 98%

Longitudinal Differences of Phytoplankton Community during a Period of Small Water Level Fluctuations in a Subtropical Reservoir Bay (Xiangxi Bay, Three Gorges Reservoir, China)

Wang

Cai

Tan

et al. 2011

International Review of Hydrobiology

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“…Xiangxi Bay is the largest tributary of the TGR near the dam, also the bay that was most widely studied. After the first impoundment, as water velocity slowed down and the water retention time prolonged, both the frequency and degree of algal blooms increased (YE et al, 2007;WANG et al, 2010). During this period, many biotic assemblages began to show a stable trend .…”

Section: Introductionmentioning

confidence: 99%

“…During this period, many biotic assemblages began to show a stable trend . The physical and chemical parameters (YE et al, 2007), phytoplankton WANG et al, 2010), zoomacroinvertebrates and the concentration of nutrients in the sediments (ZHANG et al, 2009) displayed a longitudinal pattern. A stable community type zonation was recorded specially for macroinvertebrates, all through the year, without seasonal changes .…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution of Macroinvertebrate Community along a Longitudinal Gradient in a Eutrophic Reservoir‐Bay during Different Impoundment Stages, China

Zhang

Cai

et al. 2012

International Review of Hydrobiology

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The longitudinal patterns of the macroinvertebrate community in the Xiangxi Bay of the Three Gorges Reservoir (TGR) were investigated during the second (2nd) and third (3rd) impoundment stages (October 2006-July 2010, to test the effects of increased water level fluctuations (WLF) on the macroinvertebrates. By comparing to the former reports of the first (1st) impoundment stage (inter-annual WLF 4 m), we found that oligochaetes dominated in three different stages in the Xiangxi Bay. However, the total abundance of macroinvertebrates showed a dramatical decline from the 1st to 2nd stage (interannual WLF 11 m), but changed slightly from the 2nd to 3rd stage (inter-annual WLF 30 m). This indicated that higher WLF in the 2nd stage had already greatly reduced the macroinvertebrates abundance, thereby the disturbance in the 3rd stage could only slightly affect the already reduced abundance. Three longitudinal zones (the mainstream zone, the lacustrine zone and the transitional zone) were found based on the macroinvertebrate density, biomass, and taxa richness, combined with the geographical location of each site. Significant differences in density and biomass of macroinvertebrate were found among different zones (P < 0.05), yet no significant difference was found in taxa richness (P > 0.05). Two-way indicator species analysis showed that the community type in most sites varied in different seasons from the 2nd stage, exhibiting a dynamic zonation pattern, which differed with the stable pattern of the 1st stage. This seasonal feature was coupled to the seasonal changes of the WLF. IntroductionDam construction is considered as a disturbance to the former ecosystem, or the formation of a new system, by causing a series of ecological changes (BAXTER, 1977). Impoundment after dam construction will lead to slowing down of the water velocity, increasing of the transparency, depletion of the dissolved oxygen and accumulation of nutrients (BAXTER, 1977;FRIEDL and WÜEST, 2002;YE et al., 2007). These abiotic impacts in turn have biologi- cal effects, by structuring influences on the diversity, density and the overall resilience of reservoir biota (FUREY et al., 2006;MCEWEN and BUTLER, 2010). Benthic macroinvertebrates are important in aquatic ecosystem and have widely been used as indicators of variations of environmental conditions (PHIPPS et al., 1995; PELLETIER et al., 2010). They are usually affected by the sediment properties caused by the water disturbance (MCEWEN and BUTLER, 2010), and other changes of water environment factors, e.g., algal blooms, which could influence the food resources of macroinvertebrates (LOPES et al., 2000;WHITE et al., 2005).Reservoirs formed by damming rivers always differ from natural lakes in the shape of their longitudinal profiles. Natural lakes are normally deepest in the central region, whereas reservoirs are almost always deepest just upstream from the dam. Thus, a gradient would form along the longitudinal axis of the reservoir. A typical reservoir can be divided into three zones...

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“…1), and is one of the tributary bays studied most extensively (Zhou et al, 2009(Zhou et al, , 2011Wang et al, 2011). After the impoundment of TGR, as the water velocity slowed and the water residence time was prolonged, algal blooms occurred frequently in many bays, especially in the XX bay.…”

Section: Study Area and Sample Collectionmentioning

confidence: 99%

Sedimentary nutrients in the mainstream and its five tributary bays of a large subtropical reservoir (Three Gorges Reservoir, China)

Zhang¹,

Xu²,

Shao³

et al. 2012

Quaternary International

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Longitudinal patterns of phytoplankton distribution in a tributary bay under reservoir operation

Cited by 24 publications

References 35 publications

Longitudinal Differences of Phytoplankton Community during a Period of Small Water Level Fluctuations in a Subtropical Reservoir Bay (Xiangxi Bay, Three Gorges Reservoir, China)

Longitudinal Differences of Phytoplankton Community during a Period of Small Water Level Fluctuations in a Subtropical Reservoir Bay (Xiangxi Bay, Three Gorges Reservoir, China)

Spatial Distribution of Macroinvertebrate Community along a Longitudinal Gradient in a Eutrophic Reservoir‐Bay during Different Impoundment Stages, China

Sedimentary nutrients in the mainstream and its five tributary bays of a large subtropical reservoir (Three Gorges Reservoir, China)

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