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| Boy,Jens; Godoy,Roberto; Shibistova,Olga; Boy,Diana; McCulloch,Robert; la Fuente,Alberto Andrino de; Morales,Mauricio Aguirre; Mikutta,Robert; Guggenberger,Georg. |
| BACKGROUND: Maritime Antarctica is severely affected by climate change and accelerating glacier retreat forming temporal gradients of soil development. Successional patterns of soil development and plant succession in the region are largely unknown, as are the feedback mechanisms between both processes. Here we identify three temporal gradients representing horizontal and vertical glacier retreat, as well as formation of raised beaches due to isostatic uplift, and describe soil formation and plant succession along them. Our hypotheses are (i) plants in Antarctica are able to modulate the two base parameters in soil development, organic C content and pH, along the temporal gradients, leading to an increase in organic carbon and soil acidity at relatively... |
| Tipo: Journal article |
Palavras-chave: Temporal gradients; Chronosequences; Soil succession; Soil organic carbon; Ornithic; Mycorrhiza; Maritime Antarctica; King George Island. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100007 |
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| Casanova-Katny,A.; Torres-Mellado,G. A.; Eppley,S. M.. |
| 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... |
| Tipo: Journal article |
Palavras-chave: Antarctica; Bryophyte; Climate change; Fildes Peninsula; King George Island; Sporophyte. |
| Ano: 2016 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2016000100013 |
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| DÍAZ,ANGIE; GONZÁLEZ-WEVAR,CLAUDIO ALEJANDRO; MATURANA,CLAUDIA S; PALMA,ALVARO T; POULIN,ELIE; GERARD,KARIN. |
| The glacial cycles of the Pleistocene have promoted the principal climatic changes of the Southern Ocean, and motivated scientific interest regarding the strategies developed by marine benthic invertebrates to tolerate and overcome the extension and contraction of the ice sheet on the Antarctic continental platform. A recent study of the bathymetric zonation and distribution of macro-invertebrates in a shallow subtidal area of Fildes Bay (King George Island, South Shetlands Islands, Antarctica) highlighted the presence of a large aggregation of the brooding sea urchin Abatus agassizii, whose geographic distribution is known only for localities south of the Antarctic convergence (Antarctic Peninsula and South Shetland and South Georgia Islands in the Scotia... |
| Tipo: Journal article |
Palavras-chave: Antarctic benthic fauna; COI phylogenetic relationships; King George Island; Southern Ocean; Survivor population. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400008 |
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