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Aapa Mire on the Southern Limit: a Case Study in Vologda Region (North-Western Russia)

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Aapa Mire on the Southern Limit: a Case Study in Vologda Region (North-Western Russia) Aapa mire on the southern limit: A case study in Vologda Region (north-western Russia) S.A. Kutenkov1 and D.A. Philippov2 1Institute of Biology of Karelian Research Centre, Russian Academy of Sciences, Petrozavodsk, Russian Federation 2Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, Russian Federation _______________________________________________________________________________________ SUMMARY The aim of the research was to carry out a multidisciplinary study of a mire possessing a ribbed pattern typical for aapa mires and yet situated in the Vologda Region of Russia, which is farther south than the supposed southern limit of aapa mire distribution. The study shows that the mire lies in its own basin while being part of a complex mire system. Its microtopography is represented by three well-defined elements, namely strings, lawns and flarks, which condition the mosaic structure of the vegetative cover. In terms of flora and vegetation composition, this mire is very similar to Fennoscandian rich aapa mires although it lacks a number of typical western species. Dense, well-developed tree stands on strings are prominent features of this mire. The peat deposit is of fen (predominantly swamp) type. The stratigraphy of the peat deposit demonstrates its secondary nature and the young age of the strings. Dendrochronology showed that the phase of active development of the tree stand began about 200 years ago. Thus, the mire fully corresponds to the concept of an aapa mire, on the basis of (1) characteristic topography; (2) heterotrophic vegetation typical of aapa mires; and (3) secondary nature of the strings and their young age. The studied mire provides habitat for several rare species of vascular plants and mosses, and thus requires protection. KEY WORDS: geography of mires, mire flora, mire vegetation, palaeoecology, peat deposit, Piyavochnoe mire system, Liparis loeselii _______________________________________________________________________________________ INTRODUCTION the whole European North of Russia (Yurkovskaya 1980a, 1980b, 1992). In aapa mires in the tundra and Aapa mire is a term proposed by Cajander (1913) to forest-tundra zones, boreal Cyperaceae are replaced denote large patterned or ribbed fens. It was first by subarctic species and strings are usually treeless. applied in the area of present Russia in Karelia and The second type was confined to boreal Murmansk Region by Zinserling (1934). A Fennoscandia and the third to the Russian Plain east continuous belt of aapa mires within the European of Fennoscandia; the approximate border between part of the USSR was recognised by these two regions is the Onega River (Kutenkov T.K. Yurkovskaya (1974, 1980a) and, following 2006, Kuznetsov et al. 2013). Typical of Karelian Ruuhijärvi (1960), she made a suggestion about their ring aapa mires is the string-flark pattern in the pan-boreal range (Yurkovskaya 1992) that was later central parts surrounded by pine-dwarf shrub- confirmed by analysis of satellite images Sphagnum vegetation. Northeastern aapa mires have (Yurkovskaya 2015). A multitude of studies by a similar topographical structure. However, they different authors had been devoted to aapa mires in frequently form large complex mire systems with the European North of Russia, of which the most ridge-hollow raised bogs. Northeastern aapa mires complete review was made by Yurkovskaya (1992). are distinguished by a continuous moss layer of Traditionally, three types of aapa mire massifs, mainly Sphagnum species in flarks, the absence of differing in morphology and the composition of their some west-subatlantic species (Calluna vulgaris, vegetation, are distinguished within the territory of Molinia caerulea, Carex livida, Sphagnum European Russia (Yurkovskaya 1992, Sirin et al. subfulvum) and poorer floristic composition in 2017): (1) northern European forest-tundra (Lapland) general (Yurkovskaya 1992, Sirin et al. 2017). aapa; (2) Karelian ring (boreal Fennoscandian) aapa; Antipin & Boychuk (2004) and Smagin (2012a) and (3) Onega-Pechora (north-eastern) aapa. The first described transitional variants of these types. In type was described in the Kola Peninsula forest northern Europe, an optimal territory for aapa mire tundra (Zinserling 1934) and was later found across development is known in the northern part of Mires and Peat, Volume 24 (2019), Article 10, 1–20, http://www.mires-and-peat.net/, ISSN 1819-754X © 2019 International Mire Conservation Group and International Peatland Society, DOI: 10.19189/MaP.2018.OMB.355 1 S.A. Kutenkov & D.A. Philippov AAPA MIRE ON THE SOUTHERN LIMIT Fennoscandia, where aapa is the dominant zonal type string-flark pattern corresponding to that of ‘classic’ of mire massif and occupies tens of thousands of aapa mire and our field studies led us to the square kilometres (Ruuhijärvi 1960, 1983; conclusion that this mire indeed belongs to the aapa Yurkovskaya 1992). type. Its southerly latitude increases the scientific The southern limit of aapa mires in the European interest. part of Russia has not yet been defined. Moen et al. The aim of the present work is to demonstrate, (2017) have provided the most up-to-date map of the through analyses of spatial structure, flora and distribution of string-flark mires in Europe. However, vegetation, that this mire belongs to the aapa type; to there are indications in the literature that aapa mires describe its features; and to reconstruct the formation also occur in more southerly locations. For example, history leading to the present-day appearance of the around their southern distribution limit, aapa mires mire on the basis of peat stratigraphy and have been found in the north of Leningrad Region dendrochronological data. (Botch 1990), in the south-west and south of Arkhangelsk Region (Antipin et al. 2000, Smagin 2012a, Smagin et al. 2013), in the south-west of the METHODS Komi Republic (Goncharova 2007), and sporadically in the south of Karelia (Yurkovskaya 1992). Study area The question of whether aapa mires can be found The study area is situated in the north of the Russian in Vologda Region has remained open until recently. Plain at an absolute altitude of 110–165 m, and Antipin et al. (2000) provided a description of flark- belongs to the zone of the Valdai Glaciation. The area string meso-oligotrophic complexes on the Il’inskoe is located within an ancient erosive lowland where a Mire (situated within the Andoma Upland - the thick layer of pre-Quaternary deposits covers northernmost territory of Vologda Region, close to crystalline bedrock. The uppermost layer of deposits the border with Karelia and Arkhangelsk Region). (70–90 m thick) belongs to the Moscovian stage The Il’inskoe Mire lacks bryales mosses typical for (Carboniferous System) and is represented by aapa mires as well as eutrophic species of Sphagnum marine, predominantly carbonate rocks (limestones, and grasses. Nonetheless, the authors considered dolomites, marls) (Savinov & Romanova 1970, these complexes typical for Onega-Pechora aapa Skupinova 2007). Because the Carboniferous mires and supposed that the southern limit of this limestones and dolomites are relatively soluble rocks, mire type passes through Vologda Region. However, the development of karst relief forms is characteristic our field studies did not confirm the presence of aapa for this territory. Modern karst formation is reflected mire in the part of the Andoma Upland that is in the dynamics of surface hydrological processes, included in Vologda Region, although mires particularly in the fluctuation of lake water levels and resembling aapa were found nearby in Arkhangelsk in the emergence and disappearance of surface Region. Smagin (1999) mentioned aapa complex watercourses and even lakes (Kulikovskiy 1894, flarks within Volgoda Region but did not precisely Kozlov 2012). indicate the location or give any detailed description The main relief-forming factors of the Quaternary of the mire. To the best of our knowledge, there are period were the abrasion-accumulative actions of late no other reports of aapa mires being present in this glacial and post-glacial water bodies, a relict of which region. is Lake Beloe, as well as biogenic accumulation. We have been conducting studies of mires in the Quaternary deposits of considerable thickness are Vologda Region since 2000 and, in 2007, represented by moraines, glaciolacustrine, lake, mire, D.A. Philippov began purposefully searching for alluvial and aeolian deposits. At present, the area is a mires belonging to the aapa type. Primary flat, terraced, very weakly drained glaciolacustrine interpretation of Landsat 5 and Landsat 7 satellite plain, slightly inclined towards Lake Beloe and images yielded several objects to be confirmed or belonging to the Volga-Baltic hydrological system. refuted by field studies. ‘Aapa-like’ mires have been On a significant part of the territory, groundwater studied within the Babaevskiy, Vashkinskiy and discharges into surface waters allowing widespread Vytegorskiy administrative districts in the north and paludification (Savinov & Romanova 1970). north-west of the region. However, it was not until The study area is situated on the boundary 2015 that we managed to find a mire in Vytegorskiy between two global basins - the Atlantic Ocean basin District that exhibits all the main characteristics of and the inland Eurasian runoff area. The density of aapa. It is situated in the northern part of the large the river system is less than 0.5 km km-2 and lakes
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