Control of water weeds by grass carp in two small lakes

Mitchell, C. P.

doi:10.1080/00288330.1980.9515880

Cited by 32 publications

(32 citation statements)

References 12 publications

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“…As a native or naturalized component of a system, E. densa may eventually auto-catalyze a shift from a clear water to a turbid water state as it builds sediment in shallow areas. Furthermore, the mono-specific nature of many E. densa stands exhibit vulnerability to the impact of allogenic ecosystem engineers such as carp or crayfish (Mitchell 1980, Matsuzaki et al 2009 …”

Section: Impacts and Management Of An Invasive Speciesmentioning

confidence: 99%

The ecology of Egeria densa Planchón (Liliopsida: Alismatales): A wetland ecosystem engineer?

Yarrow

Marı́n²,

Finlayson³

et al. 2009

Rev. chil. hist. nat.

131

107

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Egeria densa Planchon is considered an invasive species in continental aquatic systems in Chile. Its original geographical distribution was limited to the subtropical regions of Brazil, Argentina and Uruguay. Its fast growth and dense canopy-forming habit are associated with the clear water state of shallow water continental ecosystems. As a dominant species in many of the systems in which it occurs, E. densa behaves as an ecosystem engineer by preventing the re-suspension of sediments and controlling the growth of phytoplankton by removing nutrients from the water column. At the same time, this invasive species produces unwanted effects such as: (1) clogging waterways and hydroelectric turbines, (2) out-competing native vegetation, and (3) negatively affecting the sediment seed bank. Given its importance in the recent (2004) change of state of the Río Cruces wetland, Chile, we felt it appropriate to undertake a comprehensive literature review of this species. We conclude by discussing the role of E. densa as an ecosystem engineer while cautioning against the impression that E. densa is always a highly competitive invader.Key words: Egeria densa, ecosystem engineer, invasive species. RESUMENEgeria densa Planchon es considerada una especie invasora en los sistemas acuáticos de Chile. Su distribución geográfica original estaba limitada a regiones subtropicales de Brasil, Argentina y Uruguay. Su crecimiento rápido y su tendencia a formar densas coberturas suelen estar asociadas con el estado de aguas claras en ecosistemas acuáticos continentales de aguas someras. Su dominancia sugiere que E. densa puede comportarse como una especie ingeniera, previniendo la resuspensión de sedimentos y controlando el crecimiento del fitoplancton a través de la utilización de los nutrientes. Sin embargo, al mismo tiempo, como especie invasora produce efectos no deseados tales como: (1) no permitir el crecimiento de otras macrófitas nativas, (2) disminuir la diversidad en el banco de semillas, y (3) interferir con la navegación y generación de electricidad por turbina. Dada su importancia en el reciente (2004) cambio de estado del humedal del Río Cruces, nos ha parecido oportuno realizar una recopilación de artículos científicos disponibles en la literatura sobre esta macrófita. Concluimos con una discusión sobre el rol de E. densa como especie ingeniera; a la vez que indicamos que la especie tiene ciertas vulnerabilidades y que no cumple siempre con la idea que es una especie invasora muy competitiva.Palabras clave: Egeria densa, especie ingeniera, especie invasora.

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Section: Impacts and Management Of An Invasive Speciesmentioning

confidence: 99%

The ecology of Egeria densa Planchón (Liliopsida: Alismatales): A wetland ecosystem engineer?

Yarrow

Marı́n²,

Finlayson³

et al. 2009

Rev. chil. hist. nat.

131

107

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show abstract

“…1) is a 1.92 ha sand dune lake. Mitchell (1980) described it and detailed changes in the aquatic plant community following the introduction of grass carp. In 1976 the southern arm of Lake Parkinson was cut off from the main lake by a 6 mm mesh barrier.…”

Section: Study Areamentioning

confidence: 99%

“…Trout caught during the previous summer tended to be mainly in the vicinity of steep drop-offs, closer to deeper water (Sectors E and F). Here, the extensive weed beds present at that time (Mitchell 1980) would have provided cover for the trout.…”

Section: Factors Affecting Trout Survival Over Summermentioning

confidence: 99%

“…1) were eliminated by grass carp (Mitchell 1980) as the first step in rehabilitating the trout fishery in the lake. As the lake was moderately eutrophic before weed removal (Mitchell et al 1984) an opportunity was provided to examine some of the effects of eutrophication and weed removal, which Jonasson (1969) has listed as a sympton of advanced eutrophication, on a small, free-living trout population in the lake.…”

Section: Introductionmentioning

confidence: 99%

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Some effects of eutrophication and the removal of aquatic plants by grass carp(Ctenopharyngodon idella)on rainbow trout(Salmo gairdnerii) in Lake Parkinson, New Zealand

Rowe¹

1984

New Zealand Journal of Marine and Freshwater Research

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Temporary removal of aquatic plants in Lake Parkinson, a small, eutrophic dune lake, resulted in a number of changes to the population of stocked rainbow trout (Salmo gairdnerii). During each summer the lake stratified and low oxygen levels limited the distribution of trout to shallow (0-4 m) surface waters. In the first summer following weed removal the numbers of black shags (Phallacrocorax carbo) counted at the lake increased, and their predation resulted in a decline in trout density. However, the growth rate and condition of the trout population then exceeded that of trout present before weed removal. During the second summer after weed removal a cladoceran bloom was followed by low phytoplankton levels and high ammonia concentrations. A prolonged calm compounded this situation with the result that oxygen levels in bottom and surface waters dropped below 2 ppm. These low oxygen levels eliminated the trout population, but other fish species present survived. Elimination of aquatic plants affected the population dynamics of other fish species in the lake with potential implications for the trout. The experiment demonstrated the importance of weed beds in maintaining a stable fish community in lakes such as Lake Parkinson.

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“…Measurements of macrophyte biomass in New Zealand lakes have been few and restricted either to total communities without species separation (Dromgoole & Brown 1976;Mitchell 1980) or to stands dominated by one species, for example Isoetes alpinus Kirk and Elodea canadensis Michx.…”

Section: Introductionmentioning

confidence: 99%

Aboveground biomass and productivity of submerged macrophytes in Lake Alexandrina, New Zealand

Ward

Talbot

Stewart

1987

New Zealand Journal of Marine and Freshwater Research

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Values for aboveground biomass (standing crop) from December 1982 to December 1985 at two sites in Lake Alexandrina (South Island, New Zealand) are reported. Weak seasonality was apparent for Chara fibrosa at 1.8 m, Elodea canadensis, Isoetes alpinus, and Chara globularis. The biomass of other species did not appear to be directly related to annual changes in solar radiation and water temperature. Annual growth for six species was estimated from annual changes in aboveground biomass and ranged from 296 mg C m -2 day -1 (for E. canadensis) to 17 mg Cm -2 day -1 (for Chara corallina). The growth of two species was also determined using short-term measurements of stem and branch length and gave estimates of 177 and 545 mg C m -2 day -1 for E. canadensis at two sites and 97 mg Cm -2 day -1 for Myriophyllum triphyllum.

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Control of water weeds by grass carp in two small lakes

Cited by 32 publications

References 12 publications

The ecology of Egeria densa Planchón (Liliopsida: Alismatales): A wetland ecosystem engineer?

The ecology of Egeria densa Planchón (Liliopsida: Alismatales): A wetland ecosystem engineer?

Some effects of eutrophication and the removal of aquatic plants by grass carp(Ctenopharyngodon idella)on rainbow trout(Salmo gairdnerii) in Lake Parkinson, New Zealand

Aboveground biomass and productivity of submerged macrophytes in Lake Alexandrina, New Zealand

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