The Importance of Trophic-Level Interactions to the Abundance and Species Composition of Algae in Lakes

Shapiro, Joseph

doi:10.1007/978-94-009-9203-0_12

Cited by 123 publications

(75 citation statements)

References 22 publications

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“…The population of the phytoplankton is dependent upon the population of the zooplankton, as zooplankton grazing was identified as a strong modulator of the phytoplankton yield in lakes and reservoirs [62]. The results from the present study showed a pattern of low or inverse correlation between phytoplankton and zooplankton population density.…”

Section: Canonical Correlation Analysis (Cca)supporting

confidence: 49%

Evaluation of Spatial-Temporal Variations of Water Quality and Plankton Assemblages and Its Relationship to Water Use in Kulekhani Multipurpose Reservoir, Nepal

Adhikari¹,

Shrestha²,

Bam³

et al. 2017

JEP

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Spatial and temporal variation in planktons and water quality parameters were investigated in order to determine the effects of seasonal water use on reservoir water quality and planktons' diversity in Kulekhani Multipurpose Reservoir, Nepal. This study also focuses on interactions among various water quality parameters with planktons and how such interactions can affect the second major utility, the fish farming in the reservoir. The analyses of seasonal water samples collected from three different sampling locations in the reservoir showed that select water quality parameters varied significantly (P < 0.05) with sampling seasons (transparency: 30 -250 cm, pH: 7 -7.5, alkalinity: 30 -120 mg/L, DO: 6 -11.5 mg/L, CO 2 : 0.1 -1.1 mg/L) and sampling locations (phosphate: 0.1 -0.25 mg/L, nitrate 0.01 -0.19 mg/L) in the reservoir. Three groups of zooplankton and four classes of phytoplankton, respectively with eleven and twelve genera, were identified and quantified in the reservoir.Among them, Cyclops, Asplanchana, and Keratella were most dominant zooplanktons while Synedra, Melosira and Peridinum were the most dominant phytoplankton in the reservoir water. The abundance of select zooplanktons (Cyclops, Keratella, Polyanthra), and phytoplankton (Navicula, Melosira, Amphora, Chroococcus, Staurastrum, Scendesmus) showed significant interaction between sampling sites and sampling seasons, while the other varied only with sampling seasons and/or sites. These results showed that seasonal water level fluctuations, along with the variation of water quality para- meters, change the abundance and diversity of planktons' in the reservoir. Such changes can negatively impact the fish in cage culture, affecting the livelihood of people extensively relying on these fish farming.

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Section: Canonical Correlation Analysis (Cca)supporting

confidence: 49%

Evaluation of Spatial-Temporal Variations of Water Quality and Plankton Assemblages and Its Relationship to Water Use in Kulekhani Multipurpose Reservoir, Nepal

Adhikari¹,

Shrestha²,

Bam³

et al. 2017

JEP

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“…However, progressive recognition of ecological-biotic interactions spawned partly from long-term studies of Lake Washington (Edmondson and Litt, 1982;Edmondson, 1994;Edmondson et al, 2003), and thereafter in a range of shallow lakes in several densely populated lowland nations in Europe (e.g. Gulati et al, 1990;Moss, 1999;Kairesalo and Vakkilainen, 2004) brought widespread recognition to Shapiro's (1980) now familiar concept of food web or biomanipulation -schematically illustrated in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Food web (bio-)manipulation of South African reservoirs – viable eutrophication management prospect or illusory pipe dream? A reflective commentary and position paper

Hart¹

2007

WSA

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An overview of prospects and limitations for the application of 'classical' top-down biomanipulation as a management tool to ameliorate the consequences of eutrophication under the conditions applicable to reservoirs in South Africa is presented. This is structured by considering successive stages in reservoir food-web structure and function as far as can be generalised for South African biophysical conditions. Features and conditions that influence the potential vulnerability of local reservoirs to the effects of eutrophication, and prospects for its amelioration by biomanipulation intervention are examined. Physical factors linked to latitude (irradiation pattern and water-column stability) enhance the potential severity of eutrophication consequences in local reservoirs, although conversely, these are offset by suspended-clay turbidity. The predominance of Microcystis in local eutrophic waters is perceived as a primary major constraint in implementing 'classical' food-web manipulation. Intrinsic limitations on the ability of zooplankton grazers to control this cyanobacterium, and subsequent food-web linkages widely applicable in local reservoirs are discussed and evaluated accordingly. On balance, available evidence indicates a range of limitations that are likely to apply in respect of familiar contemporary approaches to biomanipulation in use today, although the uniqueness of each reservoir ecosystem is recognised. Some novel alternative management approaches are suggested, and a range of associated research requirements necessary to advance locally relevant scientific comprehension of 'biomanipulation' and its application are itemised. National revitalisation of reservoir limnology remains paramount.

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“…Benndorf et al 1984;Schoenberg and Carlson 1984; McQueen et al. 1986;Post and McQueen 1987) the biomass of algae (Shapiro 1980;Henssen et al 1986), water clarity (Shapiro and Wright 1984), and total phosphorus (Wright and Shapiro 1984). A few studies have also considered the combined effects of fertilization and fish addition on algal biomass (e.g.…”

mentioning

confidence: 99%

Effects of fertilization and planktivorous fish (yellow perch) predation on size distribution of particulate phosphorus and assimilated phosphate: Large enclosure experiments1

McQueen

Taylor

Lean

1988

Limnology & Oceanography

109

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Nutrients, planktivorous fish (1 + yellow perch), or both were added to eight large enclosures in a 2 x 2 factorial design. The size distributions of particulate phosphorus (PP) and assimilated 32P043-and POd3-turnover times were determined from June through August by filter fractionation. The amount of PP > 200 pm (mesoplankton) increased with fertilization and decreased with addition of fish, but the amount of PP in nanoplankton (3-20 pm) and large picoplankton (l-3 pm) showed opposite results. Fertilization and addition of fish had interacting effects on the PP in microplankton (20-200 pm). Microplankton phosphorus was higher with fish in unfertilized enclosures and lower with fish in fertilized enclosures. Slopes estimated from the relationship between the proportion of PP retained and the logarithm of filter size were used to characterize the size spectra of plankton and were lower with fertilization and steeper with addition of fish. They were negatively correlated with PO, 3-turnover time, reflecting that plankton communities dominated by small cells were more nutrient limited. The slope parameter was also significantly correlated with water clarity (Secchi depth) and algal biomass (Chl a), but particle size distribution contributed to water clarity independent of biomass or pigment concentration.This slope parameter can be used as a convenient indicator of plankton size spectra and trophic interactions in freshwater ecosystems. Manipulationof planktivorous fish causes significant changes in the size structure of zooplankton (e.g. Benndorf et al. 1984;Schoenberg and Carlson 1984; McQueen et al. 1986;Post and McQueen 1987) the biomass of algae (Shapiro 1980;Henssen et al. 1986), water clarity (Shapiro and Wright 1984), and total phosphorus (Wright and Shapiro 1984). A few studies have also considered the combined effects of fertilization and fish addition on algal biomass (e.g. Riemann and Ssndergaard 1986).The mechanisms proposed to explain the effect of fish addition have dealt primarily with the activities of large vs. small zooplankton, including nutrient regeneration (e.g. Bartell and Kitchell 1978; Bartell 198 1) and grazing (e.g. Nilssen 1978). It has also been suggested that an important difference between communities dominated by large and small zooplankton is in the amount of the total limiting nutrient and biomass sequestered in animals (Taylor 1984). Large zooplankton with relatively low metabolic rates can comprise a large fraction of the total phosphorus, but small zooplankton with high metabolic rates cannot. Furthermore, large zooplankton tend to pass on their nutrients to higher trophic levels or to the hypolimnion more readily, and total phosphorus may therefore decline more rapidly during stratification when zooplankton are large.Fertilization effects have been considered primarily from the viewpoint of increasing the overall biomass of plankton commu- 19 8 5), and it is possible that both effects must be studied simultaneously to avoid confusing the effects of fish addition w...

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The Importance of Trophic-Level Interactions to the Abundance and Species Composition of Algae in Lakes

Cited by 123 publications

References 22 publications

Evaluation of Spatial-Temporal Variations of Water Quality and Plankton Assemblages and Its Relationship to Water Use in Kulekhani Multipurpose Reservoir, Nepal

Evaluation of Spatial-Temporal Variations of Water Quality and Plankton Assemblages and Its Relationship to Water Use in Kulekhani Multipurpose Reservoir, Nepal

Food web (bio-)manipulation of South African reservoirs – viable eutrophication management prospect or illusory pipe dream? A reflective commentary and position paper

Effects of fertilization and planktivorous fish (yellow perch) predation on size distribution of particulate phosphorus and assimilated phosphate: Large enclosure experiments1

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