Southern Hemisphere Springtails: Could Any Have Survived Glaciation of Antarctica?
Throughout the Southern Hemisphere many terrestrial taxa have circum-Antarctic distributions. This pattern is generally attributed to ongoing dispersal (by wind, water, or migrating birds) or relict Gondwanan distributions. Few of these terrestrial taxa have extant representatives in Antarctica, but...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/83079 2023-05-15T13:56:14+02:00 Southern Hemisphere Springtails: Could Any Have Survived Glaciation of Antarctica? Stevens, Mark I Greenslade, Penelope Hogg, Ian Sunnucks, Paul James 2015-12-13T22:57:41Z http://hdl.handle.net/1885/83079 unknown Society for Molecular Biology Evolution 0737-4038 http://hdl.handle.net/1885/83079 Molecular Biology and Evolution Keywords: Antarctica climate change cold climate conference paper controlled study Cryptophyta DNA sequence evolution fauna genetic variability geographic distribution maximum likelihood method New Zealand nonhuman nucleotide sequence population disp Collembola Dispersal Glacial refugia Gondwana Isotomidae Mitochondrial DNA (COI) Vicariance Journal article 2015 ftanucanberra 2015-12-21T23:54:09Z Throughout the Southern Hemisphere many terrestrial taxa have circum-Antarctic distributions. This pattern is generally attributed to ongoing dispersal (by wind, water, or migrating birds) or relict Gondwanan distributions. Few of these terrestrial taxa have extant representatives in Antarctica, but such taxa would contribute to our understanding of the evolutionary origins of the continental Antarctic fauna. Either these taxa have survived the harsh climate cooling in Antarctica over the last 23 Myr (Gondwanan/vicariance origin) or they have dispersed there more recently (<2 MYA). In this context, we examined mtDNA (COI) sequence variation in Cryptopygus and related extant Antarctic and subantarctic terrestrial springtails (Collembola). Sequence divergence was estimated under a maximum likelihood model (general time reversible + I + Γ) between individuals from subantarctic islands, Australia, New Zealand, Patagonia, Antarctic Peninsula, and continental Antarctica. Recent dispersal/colonization (<2 MYA) of Cryptopygus species was inferred between some subantarctic islands, and there was a close association between estimated times of divergences based on a molecular clock and proposed geological ages of islands. Most lineages generally grouped according to geographic proximity or by inferred dispersal/colonization pathways. In contrast, the deep divergences found for the four endemic Antarctic species indicate that they represent a continuous chain of descent dating from the break up of Gondwana to the present. We suggest that the-diversification of these springtail species (21-11 MYA) in ice-free glacial refugia throughout the Trans-Antarctic Mountains was caused by the glaciation of the Antarctic continent during the middle to late Miocene. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Springtail Australian National University: ANU Digital Collections Antarctic Antarctic Peninsula New Zealand Patagonia The Antarctic |
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Open Polar |
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Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: Antarctica climate change cold climate conference paper controlled study Cryptophyta DNA sequence evolution fauna genetic variability geographic distribution maximum likelihood method New Zealand nonhuman nucleotide sequence population disp Collembola Dispersal Glacial refugia Gondwana Isotomidae Mitochondrial DNA (COI) Vicariance |
spellingShingle |
Keywords: Antarctica climate change cold climate conference paper controlled study Cryptophyta DNA sequence evolution fauna genetic variability geographic distribution maximum likelihood method New Zealand nonhuman nucleotide sequence population disp Collembola Dispersal Glacial refugia Gondwana Isotomidae Mitochondrial DNA (COI) Vicariance Stevens, Mark I Greenslade, Penelope Hogg, Ian Sunnucks, Paul James Southern Hemisphere Springtails: Could Any Have Survived Glaciation of Antarctica? |
topic_facet |
Keywords: Antarctica climate change cold climate conference paper controlled study Cryptophyta DNA sequence evolution fauna genetic variability geographic distribution maximum likelihood method New Zealand nonhuman nucleotide sequence population disp Collembola Dispersal Glacial refugia Gondwana Isotomidae Mitochondrial DNA (COI) Vicariance |
description |
Throughout the Southern Hemisphere many terrestrial taxa have circum-Antarctic distributions. This pattern is generally attributed to ongoing dispersal (by wind, water, or migrating birds) or relict Gondwanan distributions. Few of these terrestrial taxa have extant representatives in Antarctica, but such taxa would contribute to our understanding of the evolutionary origins of the continental Antarctic fauna. Either these taxa have survived the harsh climate cooling in Antarctica over the last 23 Myr (Gondwanan/vicariance origin) or they have dispersed there more recently (<2 MYA). In this context, we examined mtDNA (COI) sequence variation in Cryptopygus and related extant Antarctic and subantarctic terrestrial springtails (Collembola). Sequence divergence was estimated under a maximum likelihood model (general time reversible + I + Γ) between individuals from subantarctic islands, Australia, New Zealand, Patagonia, Antarctic Peninsula, and continental Antarctica. Recent dispersal/colonization (<2 MYA) of Cryptopygus species was inferred between some subantarctic islands, and there was a close association between estimated times of divergences based on a molecular clock and proposed geological ages of islands. Most lineages generally grouped according to geographic proximity or by inferred dispersal/colonization pathways. In contrast, the deep divergences found for the four endemic Antarctic species indicate that they represent a continuous chain of descent dating from the break up of Gondwana to the present. We suggest that the-diversification of these springtail species (21-11 MYA) in ice-free glacial refugia throughout the Trans-Antarctic Mountains was caused by the glaciation of the Antarctic continent during the middle to late Miocene. |
format |
Article in Journal/Newspaper |
author |
Stevens, Mark I Greenslade, Penelope Hogg, Ian Sunnucks, Paul James |
author_facet |
Stevens, Mark I Greenslade, Penelope Hogg, Ian Sunnucks, Paul James |
author_sort |
Stevens, Mark I |
title |
Southern Hemisphere Springtails: Could Any Have Survived Glaciation of Antarctica? |
title_short |
Southern Hemisphere Springtails: Could Any Have Survived Glaciation of Antarctica? |
title_full |
Southern Hemisphere Springtails: Could Any Have Survived Glaciation of Antarctica? |
title_fullStr |
Southern Hemisphere Springtails: Could Any Have Survived Glaciation of Antarctica? |
title_full_unstemmed |
Southern Hemisphere Springtails: Could Any Have Survived Glaciation of Antarctica? |
title_sort |
southern hemisphere springtails: could any have survived glaciation of antarctica? |
publisher |
Society for Molecular Biology Evolution |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/83079 |
geographic |
Antarctic Antarctic Peninsula New Zealand Patagonia The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula New Zealand Patagonia The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Springtail |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Springtail |
op_source |
Molecular Biology and Evolution |
op_relation |
0737-4038 http://hdl.handle.net/1885/83079 |
_version_ |
1766263598308392960 |