A Holocene moss species preserved in lake sediment core and the present moss diversity at Schirmacher Oasis, Antarctica

Singh, Shiv Mohan; Ochyra, Ryszard; Pednekar, S.M.; Asthana, Rajesh; Ravindra, Rasik

doi:10.1017/s0954102012000211

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…Many mosses have lightweight spores, facilitating aerial dispersal, and propagules from several moss species have been found in air traps in Antarctica (51). Although it has therefore long been thought that many mosses must have dispersed recently to Antarctica (46), new molecular, taxonomic, and subfossil evidence challenges this assumption, indicating that some species have persisted on the continent throughout Pleistocene glacial cycles in refugia (52,53). Furthermore, several mosses are endemic to Antarctica, and thus are most likely to have survived glaciations in situ (54).…”

Section: Discussionmentioning

confidence: 99%

Geothermal activity helps life survive glacial cycles

Fraser

Terauds

Smellie

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

137

103

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Climate change has played a critical role in the evolution and structure of Earth's biodiversity. Geothermal activity, which can maintain ice-free terrain in glaciated regions, provides a tantalizing solution to the question of how diverse life can survive glaciations. No comprehensive assessment of this "geothermal glacial refugia" hypothesis has yet been undertaken, but Antarctica provides a unique setting for doing so. The continent has experienced repeated glaciations that most models indicate blanketed the continent in ice, yet many Antarctic species appear to have evolved in almost total isolation for millions of years, and hence must have persisted in situ throughout. How could terrestrial species have survived extreme glaciation events on the continent? Under a hypothesis of geothermal glacial refugia and subsequent recolonization of nongeothermal regions, we would expect to find greater contemporary diversity close to geothermal sites than in nongeothermal regions, and significant nestedness by distance of this diversity. We used spatial modeling approaches and the most comprehensive, validated terrestrial biodiversity dataset yet created for Antarctica to assess spatial patterns of diversity on the continent. Models clearly support our hypothesis, indicating that geothermally active regions have played a key role in structuring biodiversity patterns in Antarctica. These results provide critical insights into the evolutionary importance of geothermal refugia and the history of Antarctic species.dispersal | GIS | polar region | volcano | Last Glacial Maximum

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Section: Discussionmentioning

confidence: 99%

Geothermal activity helps life survive glacial cycles

Fraser

Terauds

Smellie

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

137

103

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“…Meanwhile, three remarkable new moss species (Bryum argenteum, B. orbiculatifolium, B. archangelicum) were added to terrestrial flora of Oasis (Ochyra and Singh, 2008). Recently, Singh et al (2012) conducted a systematic survey and collected moss specimens from different terrestrial locations and lake sediments of Schirmacher Oasis which resulted in 12 species belonging to eight genera and five families. The check-list of moss flora Table 2.…”

Section: Contributions To the Bryophyte Floramentioning

confidence: 99%

Contribution to the Floral Diversity of Schirmarcher Oasis and Larsemann Hills, Antarctica

Singh¹,

Nayaka²

2017

Proceedings of the Indian National Science Academy

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In continental Antarctica, algae, fungi, lichen and mosses are the major floristic elements. To understand their distribution and diversity pattern in ice free areas of Schirmacher Oasis and Larsemann Hills investigations were conducted during various Indian Antarctic Expeditions. Due to the extreme environmental conditions in Antarctica, lichens and bryophytes undergo sever morphological changes and occur in mostly in sterile condition that makes them difficult group to identify. A total of 69 species of lichens were encountered in the Schirmacher Oasis and 25 species in the region of Larsemann Hills. Most lichens known from these two areas are microlichens. The ecophysiological studies on lichens indicated Rhizoplaca melanophthalma as the most desiccation tolerant species in Schirmacher Oasis. The studies on moss flora contributed only 12 species under eight genera and five families from Schirmacher Oasis. The sub-fossil moss Pohlia nutans of Holocene period was recorded from lake sediment cores from Schirmacher Oasis. There are several studies on algal flora of Schirmacher Oasis and in one of the studies a total of 109 species of cyanobacteria belonging to 30 genera and 9 families were recorded from Schirmacher Oasis. Similarly, a total of 19 species of fungi belonging to 13 genera and seven families were recorded from Schirmacher Oasis soils and 5 species of yeasts were recorded from Larsemann Hills. Furthermore, Thelebolus microsporus was characterized for adaptation strategies and biotechnological potentials.

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A Review of the paleoclimatic Studies from Lake Sediments of Schirmacher Oasis, East Antarctica

Govil

Mazumder

2022

Earth and Environmental Sciences Library

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A Holocene moss species preserved in lake sediment core and the present moss diversity at Schirmacher Oasis, Antarctica

Cited by 7 publications

References 28 publications

Geothermal activity helps life survive glacial cycles

Geothermal activity helps life survive glacial cycles

Contribution to the Floral Diversity of Schirmarcher Oasis and Larsemann Hills, Antarctica

A Review of the paleoclimatic Studies from Lake Sediments of Schirmacher Oasis, East Antarctica

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