scholarly journals Ecotoxic Effects of the Vehicle Solvent Dimethyl Sulfoxide on Aquatic Model Organisms

2021 ◽  
Author(s):  
Larissa Andrade-Vieira ◽  
Clement Bojic ◽  
Ingrid Alvarenga ◽  
Teotonio de Carvalho ◽  
Jean-François Masfaraud ◽  
...  
Keyword(s):  
Growth Rate ◽  
Population Growth ◽  
Dimethyl Sulfoxide ◽  
Daphnia Magna ◽  
Population Growth Rate ◽  
Exposure Period ◽  
Effective Concentration ◽  
Model Organisms ◽  
Raphidocelis Subcapitata ◽  
Frequent Use

Abstract Dimethyl sulfoxide (DMSO) is widely used as a vehicle solvent in ecotoxicity bioassays. However, despite its frequent use, itcould be toxic for organisms at some concentrations. Hence, the aim of this study was to investigate the effectsof DMSO on the population growth rate of the microalgaeRaphidocelis subcapitata, the mobility of the microcrustacean Daphnia magna,and the reproduction of the rotiferBrachionus calyciflorus. DMSO was applied to the organisms in concentrations ranging from 0.031–4%. For R. subcapitata significant effects in growth inhibitionafter 72 h of exposure was 0.125% DMSO,being the lowest observed effectconcentration (LOEC). The 50% effective concentration (EC50) was2.138 ± 0.372%. In D. magna,significant differences in the mobility after 24 h or 48 h of exposure was 1% DMSO being 1.712± 0.207% and 1.167± 0.220%DMSO the EC50 observed for 24 h and 48 h exposure, respectively. For B. calyciflorus,it was not possible to validate the tests performed, as there were insufficient animals alive in the control conditions at the end of the exposure period. Therefore, we recommended avoiding DMSO as a vehicle in assays using B. calyciflorus,and to use final DMSO concentrationsin experimental solution not exceeding 0.125% forR. subcapitata and 0.5% for D. magna.

INFLUENCE OF FOOD LIMITATION ON THE EFFECTS OF FENVALERATE PULSE EXPOSURE ON THE LIFE HISTORY AND POPULATION GROWTH RATE OF DAPHNIA MAGNA

2005 ◽  
Vol 24 (9) ◽  
pp. 2254 ◽  
Author(s):  
Barry J. Pieters ◽  
Albrecht Paschke ◽  
Sebastián Reynaldi ◽  
Michiel H.S. Kraak ◽  
Wim Admiraal ◽  
...  
Keyword(s):  
Growth Rate ◽  
Life History ◽  
Population Growth ◽  
Daphnia Magna ◽  
Population Growth Rate ◽  
Food Limitation ◽  
Pulse Exposure ◽  
Influence Of Food

scholarly journals The use of image analysis to estimate population growth rate in Daphnia magna

2006 ◽  
Vol 43 (4) ◽  
pp. 828-834 ◽  
Author(s):  
HELEN L. HOOPER ◽  
RICHARD CONNON ◽  
AMANDA CALLAGHAN ◽  
STEVE J. MAUND ◽  
MATTHIAS LIESS ◽  
...  
Keyword(s):  
Growth Rate ◽  
Image Analysis ◽  
Population Growth ◽  
Daphnia Magna ◽  
Population Growth Rate

scholarly journals Biological scaling in green algae: the role of cell size and geometry

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Helena Bestová ◽  
Jules Segrestin ◽  
Klaus von Schwartzenberg ◽  
Pavel Škaloud ◽  
Thomas Lenormand ◽  
...  
Keyword(s):  
Growth Rate ◽  
Population Growth ◽  
Population Growth Rate ◽  
Internal Diffusion ◽  
Scaling Exponent ◽  
Power Scaling ◽  
Nutrient Distribution ◽  
Metabolic Scaling ◽  
Key Factor ◽  
Size And Morphology

AbstractThe Metabolic Scaling Theory (MST), hypothesizes limitations of resource-transport networks in organisms and predicts their optimization into fractal-like structures. As a result, the relationship between population growth rate and body size should follow a cross-species universal quarter-power scaling. However, the universality of metabolic scaling has been challenged, particularly across transitions from bacteria to protists to multicellulars. The population growth rate of unicellulars should be constrained by external diffusion, ruling nutrient uptake, and internal diffusion, operating nutrient distribution. Both constraints intensify with increasing size possibly leading to shifting in the scaling exponent. We focused on unicellular algae Micrasterias. Large size and fractal-like morphology make this species a transitional group between unicellular and multicellular organisms in the evolution of allometry. We tested MST predictions using measurements of growth rate, size, and morphology-related traits. We showed that growth scaling of Micrasterias follows MST predictions, reflecting constraints by internal diffusion transport. Cell fractality and density decrease led to a proportional increase in surface area with body mass relaxing external constraints. Complex allometric optimization enables to maintain quarter-power scaling of population growth rate even with a large unicellular plan. Overall, our findings support fractality as a key factor in the evolution of biological scaling.

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