2026-06-06T17:40:28Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/414182026-02-04T08:53:20Zcom_10630_2254col_10630_37953

00925njm 22002777a 4500 dc Melero-Jiménez, Ignacio José author Martín-Clemente, Elena author García-Sánchez, María Jesús author Bañares-España, Elena author Flores-Moya, Antonio author 2020-04 The overall mean levels of different environmental variables are changing rapidly in the present Anthropocene, in some cases creating lethal conditions for organisms. Under this new scenario, it is crucial to know whether the adaptive potential of organisms allows their survival under different rates of environmental change. Here, we used an eco-evolutionary approach, based on a ratchet protocol, to investigate the effect of environmental change rate on the limit of resistance to salinity of three strains of the toxic cyanobacterium Microcystis aeruginosa. Specifically, we performed two ratchet experiments in order to simulate two scenarios of environmental change. In the first scenario, the salinity increase rate was slow (1.5-fold increase), while in the second scenario, the rate was faster (threefold increase). Salinity concentrations ranging 7–10 gL-1 NaCl (depending on the strain) inhibited growth completely. However, when performing the ratchet experiment, an increase in salinity resistance (9.1–13.6 gL-1 NaCl) was observed in certain populations. The results showed that the limit of resistance to salinity that M. aeruginosa strains were able to reach depended on the strain and on the rate of environmental change. In particular, a higher number of populations were able to grow under their initial lethal salinity levels when the rate of salinity increment was slow. In future scenarios of increased salinity in natural freshwater bodies, this could have toxicological implications due to the production of microcystin by this species. Melero-Jiménez IJ, Martín-ClementeE, García-Sánchez MJ, Bañares-España E, Flores-Moya A. Thelimit of resistance to salinity in the freshwater cyanobacteriumMicrocystis aeruginosa is modulated by the rate of salinityincrease. Ecol Evol. 2020;10:5045–5055. https://doi.org/10.1002/ece3.6257 https://hdl.handle.net/10630/41418 10.1002/ece3.6257 Cianobacterias The limit of resistance to salinity in the freshwater cyanobacterium Microcystis aeruginosa is modulated by the rate of salinity increase