Salvato in:
| Autori principali: | , , , , , , , |
|---|---|
| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Marine environmental research
2025
|
| Soggetti: | |
| Accesso online: | https://pubmed.ncbi.nlm.nih.gov/40795680/ |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
Sommario:
- Response of intertidal fucales to low-tide heat stress at their southern distributional limit. Pereira, Luís F Monteiro, Cátia Seródio, João Silva, João Seabra, Rui Lima, Fernando P Teixeira, Jorge Arenas, Francisco Hot Temperature Fucus Tidal Waves Seaweed Heat-Shock Response Stress, Physiological The increasing intensity and frequency of atmospheric heatwaves threaten the physiological capabilities of intertidal canopy-forming macroalgae, especially at their southern range, where species live closer to their upper thermal limits. While heat stress experiments on these species are increasingly common, few incorporate realistic intertidal conditions. This study assessed the physiological responses of key intertidal macroalgae across the intertidal range (Fucus serratus, Fucus spiralis, Ascophyllum nodosum, and Pelvetia canaliculata), at their southern distribution limit in the NW Iberian Peninsula to simulate heat stress using a custom setup that replicated realistic conditions, including tidal cycles and temperature patterns. Performance was measured after 10 and 20 consecutive days of diurnal emersion stress. Additionally, temperature data from in-situ loggers placed at different tide levels were used to correlate lab results with real intertidal temperatures experienced by each species. Growth and PSII maximum quantum yield (F/F) supported heat tolerance theory for intertidal zonation, indicating F. serratus as the most vulnerable and F. spiralis as the next most susceptible. Mortality primarily affected Fucus spp. and increased with the duration of the experiment. Although lipid peroxidation was responsive to thermal stress, it did not directly reflect overall performance. The consistency between in-situ temperatures and lab-measured thermal resilience highlights the need to integrate emersion, an often-overlooked factor, in thermal stress experiments in order to assess precisely intertidal species' thermal niches. Our findings reiterate the maladaptation of Fucus spp. to emersion heat stress at their southern limits and highlight the critical role of emersion exposure when assessing species' responses to climate change.