Novosti Sistematiki Nizshikh Rastenii 54(1): 211–241
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Новости систематики низших растений — Novosti sistematiki nizshikh rastenii 54(1): 211–241. 2020 The mosses of the Khulga River Basin (Subpolar Urals, Khanty-Mansi Autonomous Area — Yugra) E. D. Lapshina1, E. A. Ignatova2, M. S. Ignatov2, 3, G. N. Ganasevich1, Yu. V. Skuchas4 1Yugra State University, Khanty-Mansiysk, Russia 2Lomonosov Moscow State University, Moscow, Russia 3N.V. Tsitsin Main Botanical Garden of the Russian Academy of Sciences, Moscow, Russia 4Museum of Nature and Man, Khanty-Mansiysk, Russia Corresponding author: E. D. Lapshina, [email protected] Abstract. Result of an extensive moss study of earlier nearly unexplored areas of the northeast- ern part of the Subpolar Urals, namely Khulga River Basin is presented. An annotated list of moss- es is compiled based on the identification of 1200 specimens collected in the Khulga River Basin (60.45–65.20°N, 60.42–62.20°E). The river starts at the border between the Polar and Subpolar Urals and flows down southwards along the eastern slope of the Ural Mountains to the confluence with the Severnaya Sosva River near the village Saranpaul (Berezovo District, Khanty-Mansi Au- tonomous Area — Yugra). The list includes 210 moss species, of which 56 species are new to the Khanty-Mansi Autonomous Area — Yugra. Five species are new to the Urals: Didymodon perobtusus, Lewinskya iwatsukii, Schistidium frisvollianum, Sphagnum mirum, Warnstorfia tundrae. Further 9 spe- cies were found in the Subpolar Urals for the first time: Dicranum bardunovii, D. laevidens, D. schljak- ovii, Encalypta pilifera, Flexitrichum gracile, Grimmia elatior, G. tergestina, Orthotrichum hyperboreum, Sphagnum annulatum. The data on occurrence of many moss species, which were previously known from single finds in the mountainous part of the area, is significantly expanded. Ecology, phytoceno- tic preference and distribution of the recorded species are discussed. Keywords: bryoflora, biogeography, ecology, distribution, phytocenology, Subpolar Urals, Russia. Мхи бассейна р. Хулга (Приполярный Урал, Ханты-Мансийский автономный округ — Югра) Е. Д. Лапшина1, Е. А. Игнатова2, М. С. Игнатов2, 3, Г. Н. Ганасевич1, Ю. В. Скучас4 1Югорский государственный университет, Ханты-Мансийск, Россия 2Московский государственный университет им. М. В. Ломоносова, Москва, Россия 3Главный ботанический сад им. Н. В. Цицина РАН, Москва, Россия 4Музей Природы и Человека, Ханты-Мансийск, Россия Автор для переписки: Е. Д. Лапшина, [email protected] Резюме. Представлены результаты исследования мхов ранее почти не изученной севе- ро-восточной части Приполярного Урала, бассейна р. Хулга. Аннотированный список мхов со- ставлен на основе определения 1200 образцов, собранных в бассейне р. Хулга (60.45–65.20°N, 60.42–62.20°E), берущей начало от границы Полярного и Приполярного Урала и стекающей вдоль восточного склона Уральских гор к югу до впадения в р. Северная Сосьва в районе https://doi.org/10.31111/nsnr/2020.54.1.211 211 Lapshina et al. The mosses of the Khulga River Basin (Subpolar Urals) пос. Саранпауль (Березовский р-н, Ханты-Мансийский автономный округ). Список включа- ет 210 видов, из них 56 видов мхов являются новыми для Ханты-Мансийского автономно- го округа. Приводится 5 видов новых для Урала: Didymodon perobtusus, Lewinskya iwatsukii, Schistidium frisvollianum, Sphagnum mirum, Warnstorfia tundrae. Еще 9 видов (Dicranum bardunovii, D. laevidens, D. schljakovii, Encalypta pilifera, Flexitrichum gracile, Grimmia elatior, G. tergestina, Orthotrichum hyperboreum, Sphagnum annulatum) впервые найдены на Приполярном Урале. Су- щественно расширены представления о частоте встречаемости многих видов мхов в горной ча- сти территории округа, известных ранее по единичным находкам. Обсуждаются особенности экологии, фитоценотической приуроченности и характер распространения видов мхов. Ключевые слова: бриофлора, биогеография, экология, распространение, фитоценология, Приполярный Урал, Россия. The Subpolar Urals is the widest and most elevated part of the Ural Mountains, about 300 km in length from the headwaters of the Khulga River, from 65°40'N in the north up to 64°N in the south, including the foothill plains adjacent from the east and west (Gorchakovskiy, 1975). The first list of mosses of the Subpolar Urals was compiled by I. D. Kildyushevsky (1956). It includes 233 species with references to earlier published records by Pohle (1915), Ivanovskiy (1917), Gorodkov (1932), and Sochava (1930). Later, this list was supplemented by A. P. Dyachenko (1995) according to the literature data mainly on species identified during studies of the vegetation of the Subpolar Urals (Gorchakovs- kiy, 1955, 1958; Kuvaev, 1970, 1980; Nepomilueva et al., 1976; Nepomilueva, 1978). Thus, the total number of moss species known for the Subpolar Urals and adjacent plains was increased to 265. Though mosses of the Subpolar Urals were studied for nearly a century, knowledge on the moss species diversity, their habitats, frequency, and distribution patterns in the study area remains insufficient. Most of the former investigations of the Subpolar Urals directed at lowland plains and hilly foothills mainly in the southern and western parts of the territory, whereas data on mosses of the northeastern part of the Subpolar Urals in the Khul- ga River Basin are extremely poor. There was only one publication by B. N. Go- rodkov (1932) on the Polar Urals with a list of mosses, of which 59 species were collected in the upper reaches of the Khulga River at the northern boundary of the Subpolar Urals. In 2013–2015 we conducted studies of mosses and liverworts on the eastern slope of Subpolar Urals in the area of Mount Ner-Oika (1645 m) and 10 km to the south at the headwaters of the Puyva River (64°30'–64°33'N, 59°35'–59°38'E). The list of liverworts and partial data on mosses was published earlier (Konstantinova, Lapshi- na, 2014, 2017; Lapshina et al., 2015, 2016; Skuchas, Lapshina, 2018). The Khulga River Basin is located in the northeastern part of the Subpolar Urals, at a distance of about 120 km from the previously surveyed sites. The goal of this paper is to present a contribution on the moss flora of this nearly unexplored territory of the Polar and Subpolar Urals. 212 Новости систематики низших растений — Novosti sistematiki nizshikh rastenii 54(1): 211–241. 2020 Study area The Khulga River (the old name: Lyapin) starts to the south of the Polar Circle on the border between the Polar and Subpolar Urals and flows down along the eastern slope of the Ural Mountains to the south to its confluence with the Severnaya Sosva River (a left tributary of the Ob River) near the village Saranpaul. Administratively, the basin of the Khulga River occupies the extreme northwestern part of the Beloyarsk District and the entire Khanty-Mansi Autonomous Area. It is located between the mountain ranges of the northern part of the Subpolar Urals and the boggy areas of the West Siberian Plain within the Northern Taiga subzone. On mountain tops, tundra vegetation and forest-tundra open woodland extend far to the south. Thereby three main mountain vegetation belts are presented in the study area: forest belt (up to 350–400 m), forest-tundra belt (450–500 m), dominated by Sibe- rian pine (Pinus sibirica) and birch (Betula pubescens) open woodlands with an admix- ture of larch (Larix sibirica), alternating with thickets of alder (Duschekia fruticosa) and dwarf birch (Betula nana) communities — “yerniks”, and a mountain tundra belt, represented on the highest peaks up to 600–750 m (names of vascular plants follow Cherepanov, 1995). The study area is located at the southern boundary of the distribution of local per- mafrost with active current thermokarst processes. Most of the territory at the Middle and Lower Khulga River is plain or in some places gently undulating plain with absolute elevations of 40–90 m a. s. l. The Khulga River bed is stony, 60–80 m wide with 4–6 m deep pits and flat shal- lows. At a low water level, numerous islands and silty-stony shallows occur. The river valley is from several hundred meters to 3–4 km wide, the well-drained sites occupied by river valley forests are alternated with wet lowlands. Flat terraces are covered with transitional fens and raised bogs, as well as open woodland on shallow peat with the stunted tree layer of spruce (Picea obovata) and Siberian pine (Pinus sibirica). In plac- es where river valley is getting narrow the slopes of hill and ridges covered by moun- tainous northern taiga forests and open woodlands approach the river. The proximity of mountain ranges, composed of metamorphic and intrusive rocks with close occurrence and frequent outcrops of carbonate rocks, results in a variety of rocky substrates and nutrient-rich groundwaters, which provide a wide variety of types of peatlands and mire vegetation. The vegetation of the Khulga River Basin is formed by flood plain and mountain forests, boggy open woodlands, and raised bogs, transitional and minerotrophic fens, thickets of subalpine shrubs (yerniks, willow shrubs), mountain tundras, plant com- munities on stony substrates, including carbonate rocks, vegetation of silty-gravelly riverbanks and coastal outcrops. Material and methods The moss specimens were collected during the geobotanical survey of the main veg- etation types. Special attention was paid to rocky and stony outcrops, coasts of rivers 213 Lapshina et al. The mosses of the Khulga River Basin (Subpolar Urals) and lakes. Well recognizable species were collected from a few sites only, whereas in other cases they were only noted in the relevés. A total of 194 sites were surveyed, for which 178 geobotanical relevés were made, the full list of bryophyte species being identified. For the rest of the sites, such as the banks of rivers, streams, rocky outcrops, moss specimens were collected without vege- tation relevés. On the map all collecting sites were combined into 30 localities within 4 key areas (Fig. 1). I — Upper reaches of Khulga River near mouth of Tykotlova River (right tributary of Khulga River). Valley of Khulga River: 1 — right bank, 2 km below mouth of Tykotlova River, 65.252°N, 62.170°–62.177°E, 61 m above sea level; 2 — opposite the mouth of Tykotlova River, 65.253°– 65.269°N, 62.177°–62.184°E, 61 m a.