Stephen S. Talbot, Wilfred B. Schofield, Jiří Váňa & Sandra L. Talbot. Liverworts from Attu Island, Near Islands, Aleutian Islands, Alaska (USA) with comparison to the Commander Islands (Russia)

Biodiversity studies

Botanica Pacifica. A journal of plant science and conservation Preprint
Article first published online: 13 AUG 2018 | DOI: 10.17581/bp.2018.07203

Liverworts from Attu Island, Near Islands, Aleutian Islands, Alaska (USA) with comparison to the Commander Islands (Russia)

Stephen S. Talbot¹, Wilfred B. Schofield^2†, Jiří Váňa^3† & Sandra L. Talbot⁴

¹ U.S. Fish and Wildlife Service, Anchorage, AK 99503 USA
² Department of Botany, University of British Columbia, Vancouver, V6T 1Z4, Canada
³ Department of Botany, Charles University, 128 01 Praha 2, Czech Republic
⁴ Alaska Science Center, U.S. Geological Survey, Anchorage, AK 99508 USA
^† Deceased

The liverwort flora of Attu Island, the westernmost Aleutian Island in the United States, was studied to assess species diversity in the hyperoceanic sector of the northern boreal subzone. The field study was undertaken in sites selected to represent a spectrum of environmental variation, primarily within the eastern part of the island. Data were analyzed using our own collections on Attu Island, supplemented with information from published reports to compare bryophyte distribution patterns at three levels, the Northern Hemisphere, North America, the Commander Islands of Russia, and Alaska. A total of 112 liverworts were identified and a substantial number, 34 species (30%), were new reports from Attu Island and one was new to Alaska. Geographic elements dominating the flora included arctomontane (26%), arctoboreomontane (23%), montane (20%), and boreal (14%) species, while arctic species were almost absent (1%). The liverworts of the Attu Island-Commander Islands region were widespread species with over 70% circumpolar, or nearly circumpolar; nevertheless large gaps were present in some of their distributions with a floristic depression in liverwort distribution between Attu and the Commander Islands.

Тэлбот С.С., Схофильд В.Б., Ванья И., Тэлбот С.Л. Печеночники острова Атту, Ближние острова, Алеуты, Аляска (США) в сравнении с печеночниками Командорских островов (Россия). РПредставлены результаты исследований флоры печеночников острова Атту, самого западного алеутского острова в США, на основании которых проведена оценка видового разнообразия печеночников в гиперокеаническом секторе северной подзоны бореальной зоны. Полевые работы проводились на участках, отражающих спектр изменений условий окружающей среды, прежде всего в восточной части острова. В анализ включены наши собственные коллекции с острова Атту и опубликованные данные других авторов. Проведен анализ распределения печеночников на трех уровнях: в Северном полушарии, в Северной Америке, на российских Командорских островах и на Аляске. Было выявлено в общей сложности 112 видов печеночников, значительная часть которых – 34 вида (30 %) – впервые отмечены на острове Атту, а один вид является новым для Аляски. Географический анализ флоры позволил установить, что в спектре географических элементов преобладают арктомонтанные (26 %), арктобореомонтанные (23 %), монтанные (20 %) и бореальные (14 %) виды, в то время как арктические виды почти отсутствуют (1%). Печеночники, совместно встречающиеся на острове Атту и Командорских островах, на 70 % представлены циркумполярными или почти циркумполярными видами; тем не менее, существуют большие различия между флорами печеночников Атту и Командорских островов.

Keywords: Hepaticae, phytogeography, northern boreal, hyperoceanic, Bering Land Bridge, фитогеография, бореальная зона, гиперокеанический климат, Берингийский мост суши

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