Combined effects of microplastics and temperature on the competition between Brachionus havanaensis and Brachionus calyciflorus (Rotifera)
Por:
Reyes-Santillán, MC, Nandini, S, Sarma, SSS
Publicada:
1 jul 2024
Ahead of Print:
1 dic 2023
Resumen:
Aquatic organisms are constantly exposed to effluents which often contain microplastics. Microplastics adversely affect aquatic organisms as a result of mechanical damage during ingestion or intoxication by chemicals adsorbed on the microplastics. Sub-optimal temperatures may acerbate the adverse effects of microplastics on aquatic biota. Brachionid rotifers, such as Brachionus havanaensis and Brachionus calyciflorus, are common in tropical freshwaters. They are generalist filter feeders capable of consuming microplastic particles of a wide size range 0.05 to 40 mu m, which can eventually affect growth and competitive interactions among species. Here, we evaluated the effect of 30 mu m beads of polystyrene microplastics at 10 and 20 mg l(-1) on the population growth and competition of B. havanaensis and B. calyciflorus at 20 and 25 degrees C using 0.5 x 10(6) cells ml(-1)Chlorella vulgaris as food. Population growth decreased in treatments with microplastics at both temperatures as compared to the controls. The population growth rates ranged between 0.21 and 0.38 d(-1) for B. calyciflorus, and between 0.27 and 0.48 d(-1) for B. havanaensis. The presence of the competing species significantly lowered the population growth rate for B. calyciflorus but not for B. havanaensis. On the other hand, while the presence of the microplastics had little impact on the population growth rate of B. calyciflorus in the presence of the competitor, the reverse was true for B. havanaensis, especially at 20 degrees C. Our results show that the presence of microplastics may affect rotifer community structure in natural water bodies.
Filiaciones:
Reyes-Santillán, MC:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Mar & Limnol, Circuito Exterior S-N,Ciudad Univ, Coyoacan 04510, Mexico
Nandini, S:
Univ Nacl Autonoma Mexico, Fac Estudios Super FES I, Div Invest & Posgrad, UMF, Ave Barrios 1, Tlalnepantla 54090, Estado De Mexic, Mexico
Sarma, SSS:
Univ Nacl Autonoma Mexico, Fac Estudios Super FES I, Div Invest & Posgrad, UMF, Ave Barrios 1, Tlalnepantla 54090, Estado De Mexic, Mexico
hybrid, All Open Access; Hybrid Gold Open Access
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