Four new moss records from Îles Kerguelen

Ochyra, Ryszard; Poulsen, Roar S.

doi:10.1179/037366803235001814

Cited by 15 publications

(3 citation statements)

References 6 publications

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“…Some of the study species also occur outside of Europe, northern Asia and North America. For instance, A. lapponicum is a bipolar species (Ochyra & Poulsen ). South Hemisphere populations were not taken into account in the present study because, although molecular evidence confirmed in some instances the conspecificity of highly disjunct and sometimes bipolar populations (e.g.…”

Section: Methodsmentioning

confidence: 99%

High migration rates shape the postglacial history of amphi‐Atlantic bryophytes

et al. 2016

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Paleontological evidence and current patterns of angiosperm species richness suggest that European biota experienced more severe bottlenecks than North American ones during the last glacial maximum. How well this pattern fits other plant species is less clear. Bryophytes offer a unique opportunity to contrast the impact of the last glacial maximum in North America and Europe because about 60% of the European bryoflora is shared with North America. Here, we use population genetic analyses based on approximate Bayesian computation on eight amphi-Atlantic species to test the hypothesis that North American populations were less impacted by the last glacial maximum, exhibiting higher levels of genetic diversity than European ones and ultimately serving as a refugium for the postglacial recolonization of Europe. In contrast with this hypothesis, the best-fit demographic model involved similar patterns of population size contractions, comparable levels of genetic diversity and balanced migration rates between European and North American populations. Our results thus suggest that bryophytes have experienced comparable demographic glacial histories on both sides of the Atlantic. Although a weak, but significant genetic structure was systematically recovered between European and North American populations, evidence for migration from and towards both continents suggests that amphi-Atlantic bryophyte population may function as a metapopulation network. Reconstructing the biogeographic history of either North American or European bryophyte populations therefore requires a large, trans-Atlantic geographic framework.

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Section: Methodsmentioning

confidence: 99%

High migration rates shape the postglacial history of amphi‐Atlantic bryophytes

et al. 2016

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“…Tortella fragilis is a strict bipolar species, i.e., without intermediate localities in the tropical zone. It is widely distributed in the Southern Hemisphere but scattered in Lesotho in Southern Africa [19], in the South Island [20] and on the Campbell Islands [21] in New Zealand, in Tierra del Fuego [22], and on subantarctic South Georgia [23] and Îles Kerguelen [24]. In the Antarctic, T. fragilis has previously only been reported from the Antarctic Peninsula region where it occurs on the western coast, ranging from the Danco Coast to the Alexander Island, and on the eastern coast, from James Ross Island to the Wilkins Coast [4,25] (Fig.…”

Section: Tortella Fragilismentioning

confidence: 99%

Two additions to the moss flora of the South Shetland Islands in the maritime Antarctic

Wierzgoń¹,

Suchan²,

Ronikier³

2018

Acta Soc Bot Pol

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Tortella fragilis (Drumm.) Limpr. (Pottiaceae) and Bryum nivale Müll. Hal. (Bryaceae) are recorded for the first time from the South Shetland Islands in the northern maritime Antarctic. They were discovered in the Admiralty Bay area on King George Island, the largest island of this archipelago. The two species are briefly characterized morphologically, their habitats are described, and their distribution in the Antarctic is mapped. Discovery of these species has increased the documented moss flora of King George Island to 67 species, strengthening it in the leading position among individual areas with the richest diversity of moss flora in Antarctica. Likewise, T. fragilis and B. nivale represent remarkable additions to the moss flora of the South Shetland Islands, which currently consists of 92 species and one variety, making this archipelago by far the richest bryofloristically amongst large geographic regions of the Antarctic. Comparison of recent (2018) and old (1985) photographs revealed a significant retreat of glacial cover and suggests that the collection site was likely opened for colonization only within the last several decades. The record of T. fragilis is biogeographically relevant, and constitutes an intermediate site between the species’ occurrences in the Antarctic Peninsula and southern South America. The present record of B. nivale is the fourth discovery of the species worldwide, which may be helpful for the future designation of the distribution of this extremely rare species.

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“…The moss flora of Îles Kerguelen had about 125 species at the end of the twentieth century. However, this number has increased markedly in the last 2 decades when professional botanists and bryologists conducted field studies in this area, resulting in about 20 additional species of moss in Îles Kerguelen [72,103,104], including two as new to science [105,106]. In the present account, Macrocoma tenue (Hook.…”

Section: Studies On the Bryophyte Flora Of The Subantarcticmentioning

confidence: 99%

A brief survey of bryological studies in the Subantarctic, including Macrocoma tenue (Orthotrichaceae), a moss genus and species newly found in Îles Kerguelen

2018

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Studies on the bryophyte flora of the Southern Ocean islands and in the Antarctic are briefly reviewed and the current state of knowledge of the moss flora of Îles Kerguelen is discussed. Macrocoma tenue (Hook. & Grev.) Vitt is recorded from the Îles Kerguelen archipelago and this constitutes the first record of the genus Macrocoma (Müll. Hal.) Grout from the Subantarctic. The local plants of the species are characterized and illustrated and their ecology is discussed. Global distribution of M. tenue is reviewed and mapped. It is suggested that the type subspecies of M. tenue is a Gondwanan relictual taxon, which could have evolved on this supercontinent prior to its break-up and, subsequently, it reached Îles Kerguelen where it survived during the Pleistocene glacial epoch.

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Four new moss records from Îles Kerguelen

Cited by 15 publications

References 6 publications

High migration rates shape the postglacial history of amphi‐Atlantic bryophytes

High migration rates shape the postglacial history of amphi‐Atlantic bryophytes

Two additions to the moss flora of the South Shetland Islands in the maritime Antarctic

A brief survey of bryological studies in the Subantarctic, including Macrocoma tenue (Orthotrichaceae), a moss genus and species newly found in Îles Kerguelen

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