22 23 Abstract 24 Romania and Ukraine share the Black Sea coastline, the Danube Delta and associated habitats, 25 which harbor the unique Pontocaspian biodiversity. Pontocaspian biota represents endemic 26 aquatic taxa adapted to the brackish (anomalohaline) conditions, which evolved in the Caspian 27 and Black Sea basins. Currently, this biota is diminishing both in the numbers of species and28 their abundance because of human activities. Consequently, its future persistence strongly 29 depends on the adequacy of conservation measures. Romania and Ukraine have a common 30 responsibility to effectively address the conservation of this biota. The socio-political and legal 31 conservation frameworks, however, differ in the two countries -Romania is a member of the 32 European Union (EU), thus complying with the EU environmental policy, whereas Ukraine is an 33 EU-associated country. This may result in differences in the social network structure of 34 stakeholder institutions with different implications for Pontocaspian biodiversity conservation.35 Here, we study the structure and implications of the social network of stakeholder organizations 36 involved in conservation of Pontocaspian biodiversity in Romania, and compare it to Ukraine. 37 We apply a mix of qualitative and quantitative social network analysis methods to combine the 38 content and context of the interactions with relational measures. We show that the social 39 networks of stakeholder organizations in Romania and Ukraine are very different. Structurally, in 40 Romanian network there is a room for improvement through e.g. more involvement of 3 41 governmental and non-governmental organizations and increased motivation of central 42 stakeholders to initiate conservation action, whereas Ukrainian network is close to optimal. 43 Regardless, both networks translate into sub-optimal conservation action and the road to optimal 44 conservation is different. We end with sketching implications and recommendations for 45 improved national and cross-border conservation efforts. 46 47 Introduction 48 Pontocaspian (PC) biota is a unique, endemic flora and fauna which includes mollusks, 49 crustaceans, planktonic groups (e.g. dinoflagellates and diatoms) and fish species. This 50 biodiversity evolved in brackish (anomalohaline) conditions of the Black Sea and Caspian Sea 51 basins over the past 2.5 million years [1,2] and nowadays PC communities inhabit the Northern 52 Black Sea, Sea of Azov, Caspian Sea and adjacent river and lake systems, stretching across the 53 vast political and administrative boundaries of the surrounding countries [3]. Currently, PC biota 54 is decreasing in numbers of species and abundances as a result of human activities and their 55 future persistence strongly depends on the adequacy of conservation measures [1,4,5]. Romania 56 and Ukraine hold an important part of the PC habitats. PC species in Romania are limited to the 57 Razim-Sinoe-Babadag lake complex [6,7], the area along the Danube River and the Black Sea 58 coastal zone, which t...