land Article Assessment and Spatial Planning for Peatland Conservation and Restoration: Europe’s Trans-Border Neman River Basin as a Case Study Michael Manton 1,* , Evaldas Makrickas 1, Piotr Banaszuk 2 , Aleksander Kołos 2, Andrzej Kamocki 2 , Mateusz Grygoruk 3 , Marta Stachowicz 3 , Leonas Jarašius 4, Nerijus Zableckis 5,Jurat¯ e˙ Sendžikaite˙ 6 , Jan Peters 7, Maxim Napreenko 8, Wendelin Wichtmann 9 and Per Angelstam 10,11 1 Institute of Forest Biology and Silviculture, Faculty of Forest Science and Ecology, Vytautas Magnus University, Studentu 13, LT-53362 Akademija, 44248 Kaunas, Lithuania; [email protected] 2 Faculty of Civil Engineering and Environmental Sciences, Bialystok University of Technology, Wiejska 45 E, 15-351 Bialystok, Poland; [email protected] (P.B.); [email protected] (A.K.); [email protected] (A.K.) 3 Institute of Environmental Engineering, Warsaw University of Life Sciences-SGGW, Nowoursynowska 166, 02-999 Warsaw, Poland; [email protected] (M.G.); [email protected] (M.S.) 4 Foundation for Peatlands Restoration and Conservation, Zirmunu 58-59, LT-09100 Vilnius, Lithuania; [email protected] 5 Lithuanian Fund for Nature, Algirdo 22-3, LT-03218 Vilnius, Lithuania; [email protected] 6 Institute of Botany, Nature Research Centre, Žaliu˛ju˛Ežeru˛49, LT-12200 Vilnius, Lithuania; [email protected] 7 Michael Succow Foundation, Partner in the Greifswald Mire Centre, Ellernholzstrasse 1/3, Citation: Manton, M.; Makrickas, E.; 17489 Greifswald, Germany; [email protected] Banaszuk, P.; Kołos, A.; Kamocki, A.; 8 Shirshov Institute of Oceanology, Russian Academy of Sciences, 36, Nahimovskiy Prospekt, Grygoruk, M.; Stachowicz, M.; 117997 Moscow, Russia; [email protected] Jarašius, L.; Zableckis, N.; 9 Experimental Plant Ecology, Partner in the Greifswald Mire Centre, Institute for Botany and Landscape Sendžikaite,˙ J.; et al. Assessment and Ecology, Greifswald University, 17489 Greifswald, Germany; [email protected] 10 Spatial Planning for Peatland School for Forest Management, Faculty of Forest Sciences, Swedish University of Agricultural Sciences, Conservation and Restoration: SE-739 21 Skinnskatteberg, Sweden; [email protected] 11 Department of Forestry and Wildlife Management, Faculty of Applied Ecology, Agricultural Sciences and Europe’s Trans-Border Neman River Biotechnology, Inland Norway University of Applied Sciences, Campus Evenstad, N-2480 Koppang, Norway Basin as a Case Study. Land 2021, 10, * Correspondence: [email protected] 174. https://doi.org/10.3390/ land10020174 Abstract: Peatlands are the “kidneys” of river basins. However, intensification of agriculture and forestry in Europe has resulted in the degradation of peatlands and their biodiversity (i.e., species, Academic Editors: Tatiana Minayeva habitats and processes in ecosystems), thus impairing water retention, nutrient filtration, and carbon and Elena D. Lapshina capture. Restoration of peatlands requires assessment of patterns and processes, and spatial planning. Received: 7 December 2020 Accepted: 3 February 2021 To support strategic planning of protection, management, and restoration of peatlands, we assessed Published: 8 February 2021 the conservation status of three peatland types within the trans-border Neman River basin. First, we compiled a spatial peatland database for the two EU and two non-EU countries involved. Second, Publisher’s Note: MDPI stays neutral we performed quantitative and qualitative gap analyses of fens, transitional mires, and raised bogs at with regard to jurisdictional claims in national and sub-basin levels. Third, we identified priority areas for local peatland restoration using published maps and institutional affil- a local hotspot analysis. Nationally, the gap analysis showed that the protection of peatlands meets iations. the Convention of Biological Diversity’s quantitative target of 17%. However, qualitative targets like representation and peatland qualities were not met in some regional sub-basins. This stresses that restoration of peatlands, especially fens, is required. This study provides an assessment methodology to support sub-basin-level spatial conservation planning that considers both quantitative and qualita- Copyright: © 2021 by the authors. tive peatland properties. Finally, we highlight the need for developing and validating evidence-based Licensee MDPI, Basel, Switzerland. performance targets for peatland patterns and processes and call for peatland restoration guided by This article is an open access article social-ecological research and inter-sectoral collaborative governance. distributed under the terms and conditions of the Creative Commons Keywords: Baltic Sea region; bog; environmental history; fen; gap analysis; governance; pattern and Attribution (CC BY) license (https:// process; quantitative and qualitative Aichi targets; re-wetting; wetlands creativecommons.org/licenses/by/ 4.0/). Land 2021, 10, 174. https://doi.org/10.3390/land10020174 https://www.mdpi.com/journal/land Land 2021, 10, 174 2 of 27 1. Introduction Mires are formed in the process of anoxic decomposition of accumulated organic material in saturated conditions, commonly termed peatlands. Over thousands of years, hunter-gatherers and traditional farmers have utilized peatlands to support their liveli- hoods [1,2]. More recently, the ecosystem services approach has stressed that peatlands not only provide an important range of goods, but also deliver other important benefits, including ecosystem regulation, storage of fresh water, carbon, and nutrients, as well as biodiversity conservation and aesthetic values [3]. Peatlands cover only ca. 3% of the global land area [4] but sequester and store more carbon than any other type of terrestrial ecosystem, including the global above-ground carbon stock of forest ecosystems [3,5]. Thus, peatlands provide highly valued natural resources and services [6,7], and are known as the kidneys of the landscape [8]. However, it has been estimated that globally, 10–20% of peatlands have been de- graded [9,10]. This has reduced their ability to provide crucial ecosystem services, in- cluding water retention, nutrient filtration, carbon capture, and to support biodiversity conservation [11,12]. This transformation of peatlands is responsible for 5% of the global anthropogenic carbon dioxide (CO2) emissions [13]. Declines in both peatland quantity and quality have led to major environmental issues [12] and have negative social impacts [14]. Globally, the European continent has suffered the greatest losses of peatlands, both in absolute and relative terms [12,15,16]. Since the beginning of the 18th century, many European peatlands have been drained for intensive agriculture and forestry [17], as well as for peat extraction [3]. As a result, many EU countries have nearly depleted their peat resources, and now import peat from Eastern Europe [18]. This situation can be improved by both stopping further drainage of peatlands, and by implementing peatland restoration and re-wetting. The degradation of peatland ecosystems requires that both ecological processes and patterns [19] are dealt with. Stressing this, current policies and goals for peatland management aim towards conservation of those that remain in favourable condition, and restoration of degraded sites. Regarding processes, this is expected to reduce global greenhouse gas emissions, increase peatland’s capacity to store carbon and capture nutrients, improve water quality and reduce eutrophication of rivers and water bodies, and boost human resilience and prevent the emergence and spread of future diseases [20]. For many years, international conventions, such as the International Union for Conservation of Nature (IUCN) and the Ramsar Convention on Wetlands, have provided key frameworks for the conservation of ecological patterns and processes, and the wise use of wetlands and their resources. In 2008, the Convention on Biological Diversity [21] provided an overarching framework for biodiversity conservation by defining 20 Aichi Biodiversity Targets. The European Green Deal strategy [22] put forward by the European Commission aims towards the EU becoming climate-neutral through making the EU’s economy sustainable by boosting the efficient use of resources and moving to a clean and circular economy, restoring biodiversity, and stopping pollution by 2050. This vison includes reducing the net greenhouse gas emissions to zero by 2050 [23]. These policies are of special relevance for sustainable use, conservation, and restoration of peatlands for climate change mitigation [22] as well as biodiversity conservation [20]. Specifically focusing on ecological patterns, the establishment of functional ecological networks includes the conservation and restoration of habitat patches [24] of the focal ecosystem with sufficient quality, size, and spatial configurations to support and maintain ecological processes as well as local populations of focal species [25,26]. The EU’s Green In- frastructure policy [27] places emphasis on the conservation, management, and restoration towards strategically planned networks of representative land cover patches, which are designed to conserve biodiversity, and to deliver a wide range of ecosystem services. Securing ecological processes and patterns requires that evidence-based performance targets should be met. There are limitations on how much degradation habitats can suffer before the viability of species populations or the functions