Effects of a Reduced Fall Drawdown on Benthos Abundance in Lake Francis Case

Benson, Norman G.; Hudson, Patrick L.

doi:10.1577/1548-8659(1975)104<526:eoarfd>2.0.co;2

Cited by 22 publications

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“…These results were obtained during the first stage, when the water level fluctuated between 135 m and 139 m above sea level, with the inter-annual water level fluctuations (WLF) of 4 m. However, in the second impoundment stage, the inter-annual WLF increased to 11 m, and reached to about 30 m in the third stage. Higher WLF would enhance the mechanical mixing of the water column, change the properties of the sediment, influence the habitat of organisms, and finally cause effects to the macroinvertebrates (BENSON and HUDSON, 1975;MCEWEN and BUTLER, 2010). Therefore, in this study, the macroinvertebrate communities during the second and third impoundment stages of the TGR were surveyed.…”

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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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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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“…Sediment desiccation and erosion from precipitation and wind/wave action consolidate sediment in the drawdown exposure zone (Tarver 1980;Wagner and Falter 2002;Furey et al 2004) and increase sediment bulk density (Gottgens 1994). Conversely, a reduction in drawdown amplitude in an annual drawdown system can promote the deposition of fine sediment back into previously exposed littoral area (Benson and Hudson 1975).…”

Section: Sediment and Icementioning

confidence: 99%

“…Annual drawdowns of moderate to high amplitude (e.g., 2-3 m) promote opportunistic species with r-selected life history strategies (Benson and Hudson 1975;Kaster and Jacobi 1978;Septhton and;Paterson 1986). Rapid growth and reproduction upon inundation of the exposure zone are highly advantageous traits in frequently disturbed conditions.…”

Section: Richness and Compositionmentioning

confidence: 99%

“…For example, chironomids possess short generation times with multiple generations per year, enabling these invertebrates to avoid inhospitable conditions associated with drawdown (Fillion 1967;Koskenniemi 1994;McEwen and Butler 2010). Other taxa characteristic of annual drawdown regimes includes amphipods (Smagula and Connor 2008), oligochaetes (Grimås 1965;Kaster and Jacobi 1978), and ceratopogonids (Benson and Hudson 1975;McEwen and Butler 2010). These invertebrates can physiologically tolerate freezing and burrow in sediment to inhabit relatively unaffected substrates (Grimås 1965;Patterson and Fernando 1967;Kaster and Jacobi 1978).…”

Section: Richness and Compositionmentioning

confidence: 99%

“…Invertebrate species limited to the upper littoral are most vulnerable to wintertime low water events (Brauns et al 2008). The maximum benthic invertebrate density or biomass in spring and summer months shift to depths below the exposure zone (Grimås 1961;Fillion 1967;Benson and Hudson 1975;Kaster and Jacobi 1978;Kraft 1988;Palomäki and Koskenniemi 1993;Palomäki and Hellsten 1996;Furey et al 2006;Sheifhacken et al 2007). The shift corresponds to the distribution of food resources (e.g., and organic matter), suitable habitat, and mortality (Fillion 1967;Palomäki 1994;Palomäki and Hellsten 1996;Furey et al 2006).…”

Section: Distributionmentioning

confidence: 99%

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Ecological impacts of winter water level drawdowns on lake littoral zones: a review

Carmignani

Roy

2017

Aquat Sci

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with r-selected life history strategies and with functional traits resistant to direct and indirect drawdown effects. Fish assemblages, though less directly affected by winter drawdowns (except where there is critically low dissolved oxygen), experience negative effects via indirect pathways like decreased food resources and spawning habitat. We identify eight general research gaps to guide future research that could improve our understanding about the complex effects of winter drawdowns on littoral zone ecology.

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Ecological Effects of Water-Level Fluctuations in Lakes

Wantzen¹,

Rothhaupt²,

Mörtl³

et al. 2008

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Effects of a Reduced Fall Drawdown on Benthos Abundance in Lake Francis Case

Cited by 22 publications

References 0 publications

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

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

Ecological impacts of winter water level drawdowns on lake littoral zones: a review

Ecological Effects of Water-Level Fluctuations in Lakes

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