Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica

BACKGROUND: Mosses dominate much of the vegetation in the Antarctic, but the effect of climatic change on moss growth and sexual reproduction has scarcely been studied. In Antarctica, mosses infrequently produce sporophytes; whether this is due to physiological limitation or an adaptive response is...

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Autores principales:	Casanova-Katny,A., Torres-Mellado,G. A., Eppley,S. M.
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2016
Materias:	Antarctica Bryophyte Climate change Fildes Peninsula King George Island Sporophyte
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100013
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spelling	oai:scielo:S0716-078X20160001000132016-09-27Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime AntarcticaCasanova-Katny,A.Torres-Mellado,G. A.Eppley,S. M. Antarctica Bryophyte Climate change Fildes Peninsula King George Island Sporophyte BACKGROUND: Mosses dominate much of the vegetation in the Antarctic, but the effect of climatic change on moss growth and sexual reproduction has scarcely been studied. In Antarctica, mosses infrequently produce sporophytes; whether this is due to physiological limitation or an adaptive response is unknown. We studied the effect of experimental warming (with Open Top Chambers, OTCs) on sporophyte production on Fildes Peninsula, King George Island for four moss species (Bartramia patens, Hennediella antárctica, Polytrichastrum alpinum, and Sanionia georgicouncinata). To determine whether reducing cold stress increases sexual reproduction as would be predicted if sex is being constrained due to physiological limitations, we counted sporophytes for these four moss species in OTC and control plots during two years. Also, we measured sporophyte size for a smaller sample of sporophytes of two species, B. patens and H. antarct ca, in the OTC and control plots. RESULTS: After 2 years of the experimental treatment, maximum daily air temperature, but not daily mean air temperature, was significantly higher inside OTCs than outside. We found a significant species by treatment effect for sporophyte production, with more sporophytes produced in OTCs compared with controls for B. patens and P. alpinum. Also, sporophytes of B. patens and H. antarctica were significantly larger in the OTCs compared with the control plots. CONCLUSIONS: Our results suggest that the lack of sexual reproduction in these Antarctic mosses is not adaptive but is constrained by current environmental conditions and that ameliorating conditions, such as increased temperature may affect sexual reproduction in many Antarctic mosses, altering moss population genetics and dispersal patterns.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.89 20162016-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100013en10.1186/S40693-016-0061-Y
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Antarctica Bryophyte Climate change Fildes Peninsula King George Island Sporophyte
spellingShingle	Antarctica Bryophyte Climate change Fildes Peninsula King George Island Sporophyte Casanova-Katny,A. Torres-Mellado,G. A. Eppley,S. M. Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica
description	BACKGROUND: Mosses dominate much of the vegetation in the Antarctic, but the effect of climatic change on moss growth and sexual reproduction has scarcely been studied. In Antarctica, mosses infrequently produce sporophytes; whether this is due to physiological limitation or an adaptive response is unknown. We studied the effect of experimental warming (with Open Top Chambers, OTCs) on sporophyte production on Fildes Peninsula, King George Island for four moss species (Bartramia patens, Hennediella antárctica, Polytrichastrum alpinum, and Sanionia georgicouncinata). To determine whether reducing cold stress increases sexual reproduction as would be predicted if sex is being constrained due to physiological limitations, we counted sporophytes for these four moss species in OTC and control plots during two years. Also, we measured sporophyte size for a smaller sample of sporophytes of two species, B. patens and H. antarct ca, in the OTC and control plots. RESULTS: After 2 years of the experimental treatment, maximum daily air temperature, but not daily mean air temperature, was significantly higher inside OTCs than outside. We found a significant species by treatment effect for sporophyte production, with more sporophytes produced in OTCs compared with controls for B. patens and P. alpinum. Also, sporophytes of B. patens and H. antarctica were significantly larger in the OTCs compared with the control plots. CONCLUSIONS: Our results suggest that the lack of sexual reproduction in these Antarctic mosses is not adaptive but is constrained by current environmental conditions and that ameliorating conditions, such as increased temperature may affect sexual reproduction in many Antarctic mosses, altering moss population genetics and dispersal patterns.
author	Casanova-Katny,A. Torres-Mellado,G. A. Eppley,S. M.
author_facet	Casanova-Katny,A. Torres-Mellado,G. A. Eppley,S. M.
author_sort	Casanova-Katny,A.
title	Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica
title_short	Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica
title_full	Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica
title_fullStr	Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica
title_full_unstemmed	Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica
title_sort	reproductive output of mosses under experimental warming on fildes peninsula, king george island, maritime antarctica
publisher	Sociedad de Biología de Chile
publishDate	2016
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100013
work_keys_str_mv	AT casanovakatnya reproductiveoutputofmossesunderexperimentalwarmingonfildespeninsulakinggeorgeislandmaritimeantarctica AT torresmelladoga reproductiveoutputofmossesunderexperimentalwarmingonfildespeninsulakinggeorgeislandmaritimeantarctica AT eppleysm reproductiveoutputofmossesunderexperimentalwarmingonfildespeninsulakinggeorgeislandmaritimeantarctica
_version_	1718439703486660608

Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica

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