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- W3018969283 abstract "Geographic variation of phenotypic traits affects the capacity of species to withstand and adapt to environmental stress. Here, we examined how geographic origin influences UV stress tolerance of the red seaweeds Chondracanthus chamissoi and Gelidium lingulatum distributed along the South‐East Pacific coast between 20° S and 42° S. Seaweeds from six ( C. chamissoi ) and five ( G. lingulatum ) populations were grown under common‐garden conditions and then exposed to consecutive UV stress events and essential biological traits (e.g., growth, photosynthetic responses, antioxidant capacity, and UV‐absorbing compounds) were analyzed. In C. chamissoi , a strong UV sensitivity occurred in populations from mid‐latitudes (27° S and 29° S) where the lowest recovery of maximum quantum yield ( F v / F m ; between 32.3% and 66.8% of control) and growth rate were observed. Likewise, the lowest amount of mycosporine‐like amino acids (MAAs) and a significant decrease in phycobilins were registered in these populations. In G. lingulatum , recovery of F v / F m ranged from 82.0% to 97.7% of control, and antioxidant activity, carotenoid, and MAA contents were positively influenced by UV exposure. The multivariate analysis indicated a significant influence of PAR, cloud cover, and UV index on physiological traits, depending on species. The ecotypic differentiation index (EDI) indicated a higher phenotypic variation in C. chamissoi (EDI = 0.10) than G. lingulatum (EDI = 0.03). This study shows that the spatial distribution of UV stress tolerance in the studied seaweeds does not follow linear latitudinal or central–edge gradients. Instead, among‐site variability of solar intensities driven by specific climatic conditions seems to act as driver of phenotypic variation." @default.
- W3018969283 created "2020-05-01" @default.
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- W3018969283 date "2020-06-01" @default.
- W3018969283 modified "2023-10-14" @default.
- W3018969283 title "Geographic Variation of UV Stress Tolerance in Red Seaweeds Does Not Scale with Latitude Along the SE Pacific Coast" @default.
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- W3018969283 doi "https://doi.org/10.1111/jpy.13009" @default.
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