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Increasing temperature within thermal limits compensates

Increasing temperature within thermal limits compensates negative ultraviolet‐B radiation effects in terrestrial and aquatic organisms

Jin, P., S. Overmans, C.M. Duarte, S. Agustí (2019). Increasing temperature within thermal limits compensates negative ultravioletB radiation effects in terrestrial and aquatic organisms. Global Ecology and Biogeography, https://doi.org/10.1111/geb.12973

Jin, P., S. Overmans, C.M. Duarte, S. Agustí
additive, aquatic, global change, terrestrial, UV‐B radiation, warming
2019

Aim: The interactive effects of increased temperature and ultravioletB (UVB) ra diation on terrestrial and aquatic biota remain poorly understood. Our goal is to in crease knowledge by providing a comprehensive assessment of the combined effects of warming and increased UVB on organisms across these domains.

Location: Global.

Time period: 1995–2016.

Major taxa studied: Terrestrial plants and animals, and marine and freshwater micro algae, macroalgae and animals.

Methods: We examined, using a metaanalysis based on 1,139 published experimental assessments, the combined effects of temperature and UVB across terrestrial, freshwater and marine biota. We characterized the prevailing mode of combined effects (additive, synergistic or antagonistic), and assessed whether these were dosedependent or differed between terrestrial, freshwater and marine species, or between organisms growing in the Northern and Southern Hemispheres.

Results: Our results show that the two stressors generally acted opposingly, with a significant positive effect of increased temperature and a significant adverse effect of elevated UVB radiation. Regarding their interactive impact, additive interactions(84%) appeared to be much more common compared with multiplicative (16%) ef fects. The frequencies of interaction types differed significantly among the three habitats and different plant functional groups. The proportion of both synergistic and antagonistic effects increased with increasing magnitude of temperature and UVB changes, suggesting that additivity is constrained by an organism’s thermal and physiological limits.

Main conclusions: Our analysis demonstrates that due to their mostly opposing na ture, elevated temperature, within the thermal limits of organisms, tends to com pensate for the negative impact of UVB radiation when acting together, while their additive interaction is likely to assist impact prognosis. Our study, therefore, provides new insights into the predictions of the interactive effects of global change drivers across different habitats