RT Conference Proceedings
T1 Warming rate could influence the thermal resistance in freshwater phytoplankton
A1 Sánchez de Pedro Crespo, Raquel
A1 Melero-Jiménez, Ignacio José
A1 Reul, Andreas
A1 Viruel, María Ángeles
A1 Bañares-España, Elena
A1 Flores-Moya, Antonio
A1 García-Sánchez, María Jesús
K1 Plantas - Efectos del calentamiento global - Congresos
AB Global warming is altering the composition of freshwater phytoplankton communities due to the differential potential of species to respond to increasing temperatures. Eco-evolutionary theory supports that the rate of environmental deterioration modulates the probability to evolve under selective pressures [1]. Thus, might different warming rates differentially increase the limits of thermal resistance in freshwater phytoplankton? We compared the growth response of one strain of the bloom forming cyanobacterium Microcystis aeruginosa (Kützing) Kützing and the green microalga Chlamydomonas reinhardtii P. A. Dang under two different warming scenarios. We applied a ratchet protocol [2] to test if different warming rates (slow, +2 ºC, and rapid, +4 ºC) could influence the ability of both species to surpass their initial limit of thermal resistance (LTR). After 5 months (128 generations for both species), one of the four populations of M. aeruginosa exposed to slow warming was able to exceed its initial LTR (33 ºC) after 46 generations, being able to grow at 35 ºC, but showing a lower photosynthetic performance than their ancestral populations at control conditions (25ºC). However, at rapid warming none of the M. aeruginosa populations surpassed the initial LTR, as observed in C. reinhardtii regardless of warming rate. Nevertheless, the derived populations of C. reinhardtii showed higher photosynthetic capacity at their initial LTR (37 ºC) compared to the ancestral populations. The ability of natural phytoplankton populations to survive at increasing warming would depend on the species and would be favored by slow temperature increase, at the expense of a physiological cost.
YR 2024
FD 2024-01-19
LK https://hdl.handle.net/10630/29368
UL https://hdl.handle.net/10630/29368
LA spa
NO Project EXPEVOGEN-CG. Rapid evolution of model photosynthetic microorganisms: experimental evolution and genomic approaches to the effect of global warming. Agencia Estatal de Investigación (Madrid, ES) (PID2020-118045 GB-I00).
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026