Arid
DOI10.1186/s40693-016-0061-y
Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica
Casanova-Katny, A.1,2; Torres-Mellado, G. A.2; Eppley, S. M.3,4
通讯作者Casanova-Katny, A.
来源期刊REVISTA CHILENA DE HISTORIA NATURAL
ISSN0716-078X
EISSN0717-6317
出版年2016
卷号89
英文摘要

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 antarctica, 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. antarctica, 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.


英文关键词Antarctica Bryophyte Climate change Fildes Peninsula King George Island Sporophyte
类型Article
语种英语
国家Chile ; USA
收录类别SCI-E
WOS记录号WOS:000382982900001
WOS关键词INTERNATIONAL GEOPHYSICAL YEAR ; CLIMATE-CHANGE ; SEXUAL REPRODUCTION ; ENVIRONMENTAL-CHANGE ; SPOROPHYTE ABORTION ; VASCULAR-PLANT ; DESERT MOSS ; DICRANUM-POLYSETUM ; TUNDRA ; ECOSYSTEM
WOS类目Biodiversity Conservation ; Ecology
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/196087
作者单位1.Univ Catolica Temuco, Nucleo Estudios Ambientales, Rudecindo Ortega 02950, Temuco, Chile;
2.Univ Concepcion, Fac Ciencias Nat, Dept Bot, Lab Micol & Micorrizas, Barrio Univ S-N, Concepcion, Chile;
3.Portland State Univ, Dept Biol, Portland, OR 97207 USA;
4.Portland State Univ, Ctr Life Extreme Environm, Portland, OR 97207 USA
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GB/T 7714
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[J],2016,89.
APA Casanova-Katny, A.,Torres-Mellado, G. A.,&Eppley, S. M..(2016).Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica.REVISTA CHILENA DE HISTORIA NATURAL,89.
MLA Casanova-Katny, A.,et al."Reproductive output of mosses under experimental warming on Fildes Peninsula, King George Island, maritime Antarctica".REVISTA CHILENA DE HISTORIA NATURAL 89(2016).
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