DOI: 10.1111/gbi.12280
Scopus记录号: 2-s2.0-85043482614
论文题名: The "Dirty Ice" of the McMurdo Ice Shelf: Analogues for biological oases during the Cryogenian
作者: Hawes I. ; Jungblut A.D. ; Matys E.D. ; Summons R.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2018
语种: 英语
英文关键词: Antarctica
; Cryogenian
; Cyanobacterial mats
; Ice shelf
; Refugia
; Snowball Earth
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: The Cryogenian (~717-636 Ma) is characterized by widespread glaciation and dramatic fluctuations in biogeochemical cycling during the Sturtian and Marinoan glaciations. The Snowball Earth hypothesis posits that during this period, ice-covered oceans of more or less global extent shut down or greatly diminished photosynthesis in the marine realm. However, rather than suffering a catastrophic loss of biodiversity, fossil evidence suggests that major eukaryotic lineages survived and, indeed, the end of the Cryogenian marks the onset of a rapid diversification of eukaryotic life. Persistence of diverse life forms through glaciations is thought to have occurred in supraglacial refugia although the exact nature and full extent of such habitats remain uncertain. We present further evidence for the diversity and characteristics of supraglacial ecosystems on the McMurdo Ice Shelf in Antarctica and suggest that refugia analogous to "dirty ice," that is debris-covered ice shelf ecosystems, potentially provided nutrient-rich and long-lasting biological Cryogenian oases. We also discuss how features of the McMurdo Ice Shelf indicate that mechanisms exist whereby material can be exchanged between the shallow sea floor and the surfaces of ice shelves along continental margins, providing vectors whereby ice shelf ecosystems can nourish underlying seafloor communities and vice versa. © 2018 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85029
Appears in Collections: 影响、适应和脆弱性
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作者单位: University of Waikato Tauranga, New Zealand; Life Sciences Department Natural History Museum London UK; Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of Technology Cambridge, MA USA
Recommended Citation:
Hawes I.,Jungblut A.D.,Matys E.D.,et al. The "Dirty Ice" of the McMurdo Ice Shelf: Analogues for biological oases during the Cryogenian[J]. Geobiology,2018-01-01