Cladocera populations in Trasimeno Lake (Italy) 16/07/87 to 28/12/88

Taticchi, Maria Illuminata; Artegiani, I.; Isa, Carolina Paz Mohamad

doi:10.1080/03680770.1989.11898910

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“…During the summer period, three other species were part of the pelagic cladoceran fauna: Leptodora kindtii was present only in June with a maximum density of 0.23 ind./liter, while in the previous year (Taticchi et al, 1991) they were also found from August through October. Daphnia cucullata appeared only in the 21st June sampling at a density of 14.7 ind./liter which coincided with the maximum Leptodora density.…”

Section: Zooplankton Population Dynamicsmentioning

confidence: 99%

“…Since 1986, the population dynamics of pelagic cladocerans in Lake Trasimeno have been studied (Taticchi et al, 1988(Taticchi et al, , 1989(Taticchi et al, , 1991Taticchi, 1989) in order to evaluate production. In addition, an attempt was made to find biological indicators of the above-mentioned trophic evolution, by relating the population parameters of the dominant cladoceran species to the phytoplankton density and to some environmental factors.…”

Section: Introductionmentioning

confidence: 99%

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Population dynamics ofDaphnia galeataSars andBosmina longirostrisMuell in Lake Trasimeno, Italy

Taticchi

Pandolfi

Biondi

et al. 1992

Bolletino di zoologia

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Seasonal changes of the two dominant Zooplankton species in Lake Trasimeno, Bosmina longirostris and Daphnia galeata, was studied to evaluate factors regulating plankton production and the trophic state of the lake. Weekly samples were taken from January to December 1989. Parameters of population structure (total density, and densities of eggs, juveniles, and adults) and changes in body size were studied in relation to some environmental factors. Multiple regression models were used to analyze density and body size variations to evaluate the effects of temperature and food on growth of the two populations. The statistical models showed a significant influence of temperature and food on the seasonal patterns of density and body size of both species. In comparison with previous years, in 1989 a sharp decrease in the average body size of D. galeata was observed; this was determined primarily by the scarcity of food, rather than by predation. On the other hand, B. longirostris increased in size, being favoured by its feeding flexibility and by the composition of phytoplankton, which was made up mainly of smallsized algae; Bosmina thus became numerically dominant over Daphnia.

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Section: Zooplankton Population Dynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%