An experimental study of the summer decline in a <i>Daphnia</i> population

Larsson, Petter; Johnsen, Geir; Steigen, Andreas

doi:10.1080/03680770.1983.11897844

Cited by 8 publications

(8 citation statements)

References 4 publications

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“…In natural freshwater bodies, the population dynamics of Daphnia are often controlled by food conditions (Kwik & Carter, 1975; Threlkeld, 1976; Larsson, Johnsen & Steigen, 1985), as well as by other factors such as predation (Hall, 1964; Vijverberg & Richter, 1982; Hanazato, Yasuno & Hosomi, 1989), temperature (Hall, 1964; Tappa, 1965; Vijverberg & Richter, 1982) and pH (O'Brien & DeNoyelles, 1972; Havens & Hanazato, 1993). The food abundance may change with changing densities of the Daphnia populations in the field and the Daphnia are often exposed to food‐limited conditions.…”

Section: Discussionmentioning

confidence: 99%

Changes in vulnerability of Daphnia to an insecticide application depending on the population phase

Hanazato

Hirokawa

2004

Freshwater Biology

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1. Laboratory populations of cloned Daphnia pulex at three population phases (growing phase, density peak, declining phase) were exposed to the insecticide carbaryl at 15 lg L )1 , which killed juveniles but not adults. 2. The population decline was largest and recovery was slowest when the chemical was applied at the density peak, indicating that the population was most sensitive to the chemical at that stage. Populations in the declining phase were least affected by the treatment. 3. We propose that food condition, which varies with population density, was a major factor affecting vulnerability to carbaryl. In that case, Daphnia populations in lakes would be most vulnerable to toxic chemicals during food-limited condition such as the spring clear-water phase.

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Section: Discussionmentioning

confidence: 99%

Changes in vulnerability of Daphnia to an insecticide application depending on the population phase

Hanazato

Hirokawa

2004

Freshwater Biology

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“…In summer D. Zongispina dominates the zooplankton (Larsson et al 1985). The fish fauna consists of a sparse population of brown trout (Salmo trutta), eel (Angzula anguilla), three-spined sticklebacks (Gasterosteus aculeatus), and a population of Atlantic salmon (Salmo salar) and rainbow trout (Salmo gairdneri) that escaped from a fish farm located on the lake since 1979.…”

Section: Methodsmentioning

confidence: 99%

“…The amounts represented about 1 .O mg C liter-' twice a day for 2 d before the final recordings. Daphnia longispina has previously been reared successfully on yeast in enclosures in Lake Kvernavatn (Larsson et al 1985). Surface addition of the yeast was meant to mimic primary production.…”

Section: Methodsmentioning

confidence: 99%

The effect of food limitation on vertical migration in Daphnia longispina1

Johnsen

Jakobsen

1987

Limnology & Oceanography

157

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Diel vertical migration of a natural population of Daphnia longispina was investigated experimentally in enclosures twice in 1985. The amount of available food was manipulated and vertical distributions were recorded at times of low (night) and high (day) risk of predation from fish. In the first experiment, the large D. longispina displayed diel migrations. When food was depleted experimentally, however, the large animals were near the surface during both day and night. In the second experiment, large D. longispina first began to migrate after being provided with ingestionrate-saturating concentrations of food. Vertical migrations in D. longispina seemed to reflect a trade off between two conflicting interests: avoiding predation and risking starvation. This trade off was balanced by the overall amount of available food, restricting migrations of the large animals when food was scarce.

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“…Similar patterns were also observed in 1983 (Iwakuma et al, in press) and 1985 (Matsubara, unpublished data), although the timing of these seasonal events differed somewhat in each year. The summer decline in Daphnia density has been reported by many workers (e.g., Hall 1964;Threlkeld, 1979;Larsson et al, 1985;Taylor and Gerking, 1985). The summer decline seems to be a very characteristic phenomenon of the seasonal dynamics of this genus in most eutrophic waterbodies, although an increase in density of D. longispina in the anoxic hypolimnion during the summer has been reported in Lake Yunoko (Hanazato and Yasuno, in press).…”

Section: Discussionmentioning

confidence: 90%

“…A summer density decline in the larger cladocerans and/or a species shift from larger to smaller herbivores is often seen in waters containing fish (Threlkeld, 1979;Vijverberg and Richter, 1982;Bernardi et al, 1985;Larsson et al, 1985;Taylor and Gerking, 1985), where selective predation by planktivorous fish is considered to be either important (Threlkeld, 1979;Vijverberg and Richter, 1982) or not (Bernadi et al, 1985;Taylor and Gerking, 1985;Larsson et al, 1985). In the present study, Ceratium hirundinella might have been important for the shift of the dominant herbivore from the larger D. rosea to the smaller Ceriodaphnia reticulata in August/September, since large algae interfere with the food collection and ingestion by larger species to a greater extent than that by smaller filter-feeding cladocerans (Webster and Peters, 1978;Gliwicz and Siedlar, 1980).…”

Section: Discussionmentioning

confidence: 98%

Population dynamics of Daphnia rosea in a small eutrophic pond

Shei

Iwakuma

1988

Ecological Research

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The population dynamics of Daphnia rosea were studied in a small, eutrophic fish-free pond during November 1986-November 1987. D. rosea showed two density peaks in 1987, a high peak in spring and a slightly lower one in autumn, but they disappeared in mid-and late summer when a smaller cladoceran, Ceriodaphnia reticulata, dominated.The rapid decline in density of D. rosea in mid,May and the low density in June/July were preceded by or coincided with a period of increased male density, the appearance of ephippial females, smaller body length of adult females, decreased brood size, and increased frequency of empty brood chambers, all of which indicate a worsening food situation. The rapid density decline of D. rosea in mid-May was considered attributable neither to increasing water temperature, nor predation by the dipteran Chaoborus flavicans, but to insufficient food conditions for the maintenance of stable reproduction.Although edible phytoplankton was abundant in June/July, the general food situation was not suitable for D. rosea due to blooms of the large-celled dinoflagellate, Ceratium hirundinella, which probably inhibited the feeding activity of D. rosea. The C. hirundinella blooms might also be important for the shift of the dominant herbivore from the larger D. rosea to the smaller Ceriodaphnia reticulata in August/September.

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An experimental study of the summer decline in a Daphnia population

Cited by 8 publications

References 4 publications

Changes in vulnerability of Daphnia to an insecticide application depending on the population phase

Changes in vulnerability of Daphnia to an insecticide application depending on the population phase

The effect of food limitation on vertical migration in Daphnia longispina1

Population dynamics of Daphnia rosea in a small eutrophic pond

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