Abstract
Abstract Climate change, including ozone depletion, has altered wind regimes around Antarctica in recent decades, intensifying environmental stress on coastal moss communities. However, the physiological impacts of wind on mosses remain poorly understood. This study explored the potential climatic drivers of wind speed (WS) changes and investigated the physiological effects of variation in WS on three dominant Antarctic moss species ( Schistidium antarctici , Ceratodon purpureus , and Bryum pseudotriquetrum ) in the Windmill Islands, East Antarctica. Our analysis showed that ozone depletion contributed to increased regional summer WS. To investigate biological responses, we examined changes in moss turf water content (TWC), the effective quantum yield of photosystem II [Y(II)], and pigment profiles between two growing seasons with contrasting climatic conditions. The 1999–2000 season was windier, colder, and less humid compared with the 2002–2003 season. Redundancy analysis (RDA) revealed that WS was the strongest predictor of moss physiological performance, explaining 31.8% of the variation in TWC and 37.4% for Y(II), both of which were negatively correlated with WS ( p < 0.0001). In the cosmopolitan moss species ( C . purpureus and B . pseudotriquetrum ), xanthophyll cycle photoprotection increased significantly ( p < 0.0001) under higher wind conditions but decreased with higher TWC ( p < 0.001). No such pattern was observed in the endemic S . antarctici . Our results suggest that increasing summer WS, associated with a more positive Southern Annular Mode, is exacerbating the desiccation of these coastal East Antarctic moss communities, thereby favoring the expansion of cosmopolitan species and displacing the endemic moss.
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Claims 11
Claim · model-written summary
Ozone depletion contributed to increased regional summer wind speed.
Verbatim
e0“Our analysis showed that ozone depletion contributed to increased regional summer WS.”
t0“Antarctic Mosses”
Claim · model-written summary
Wind speed explained 31.8% of variation in moss turf water content, which was negatively correlated with wind speed.
Verbatim
e0“WS was the strongest predictor of moss physiological performance, explaining 31.8% of the variation in TWC and 37.4% for Y(II), both of which were negatively correlated with WS ( p < 0.0001).”
t0“Antarctic Mosses”
Claim · model-written summary
Wind speed explained 37.4% of variation in photosystem II quantum yield, which was negatively correlated with wind speed.
Verbatim
e0“WS was the strongest predictor of moss physiological performance, explaining 31.8% of the variation in TWC and 37.4% for Y(II), both of which were negatively correlated with WS ( p < 0.0001).”
t0“Antarctic Mosses”
Claim · model-written summary
C. purpureus increased xanthophyll cycle photoprotection under higher wind.
- Taxon
- C . purpureus
Ceratodon purpureuse0 - Treatment
- higher wind conditionse0
- Outcome
- xanthophyll cycle photoprotectione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the cosmopolitan moss species ( C . purpureus and B . pseudotriquetrum ), xanthophyll cycle photoprotection increased significantly ( p < 0.0001) under higher wind conditions but decreased with higher TWC ( p < 0.001).”
Claim · model-written summary
B. pseudotriquetrum increased xanthophyll cycle photoprotection under higher wind.
- Taxon
- B . pseudotriquetrum
_5977.jpg?width=60)
Ptychostomum pseudotriquetrume0 - Treatment
- higher wind conditionse0
- Outcome
- xanthophyll cycle photoprotectione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_5977.jpg?width=500)
Verbatim
e0“In the cosmopolitan moss species ( C . purpureus and B . pseudotriquetrum ), xanthophyll cycle photoprotection increased significantly ( p < 0.0001) under higher wind conditions but decreased with higher TWC ( p < 0.001).”
Claim · model-written summary
C. purpureus xanthophyll cycle photoprotection decreased with higher turf water content.
- Taxon
- C . purpureusCeratodon purpureuse0
- Treatment
- higher TWCe0
- Outcome
- xanthophyll cycle photoprotectione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the cosmopolitan moss species ( C . purpureus and B . pseudotriquetrum ), xanthophyll cycle photoprotection increased significantly ( p < 0.0001) under higher wind conditions but decreased with higher TWC ( p < 0.001).”
Claim · model-written summary
B. pseudotriquetrum xanthophyll cycle photoprotection decreased with higher turf water content.
- Taxon
- B . pseudotriquetrumPtychostomum pseudotriquetrume0
- Treatment
- higher TWCe0
- Outcome
- xanthophyll cycle photoprotectione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the cosmopolitan moss species ( C . purpureus and B . pseudotriquetrum ), xanthophyll cycle photoprotection increased significantly ( p < 0.0001) under higher wind conditions but decreased with higher TWC ( p < 0.001).”
Claim · model-written summary
The endemic S. antarctici did not show the wind and water-content photoprotection pattern.
- Taxon
- S . antarcticiSchistidium antarcticie0
- Outcome
- No such patterne0
Verbatim
e0“No such pattern was observed in the endemic S . antarctici .”
Claim · model-written summary
The authors suggest stronger summer winds exacerbate desiccation of coastal East Antarctic moss communities.
Verbatim
e0“increasing summer WS, associated with a more positive Southern Annular Mode, is exacerbating the desiccation of these coastal East Antarctic moss communities, thereby favoring the expansion of cosmopolitan species and displacing the endemic moss.”
Claim · model-written summary
The authors suggest wind-driven desiccation favors expansion of cosmopolitan mosses.
Verbatim
e0“increasing summer WS, associated with a more positive Southern Annular Mode, is exacerbating the desiccation of these coastal East Antarctic moss communities, thereby favoring the expansion of cosmopolitan species and displacing the endemic moss.”
Claim · model-written summary
The authors suggest wind-driven desiccation displaces the endemic moss.
Verbatim
e0“increasing summer WS, associated with a more positive Southern Annular Mode, is exacerbating the desiccation of these coastal East Antarctic moss communities, thereby favoring the expansion of cosmopolitan species and displacing the endemic moss.”