For understanding local and regional seed dispersal and plant establishment processes and for considering the ecotypes and other forms of specific variability, hard data of locally or regionally measured traits are necessary. We provided newly measured seed weight data of 193 taxa, out of which 24 taxa had not been represented in the SID, LEDA or BiolFlor databases. Our new measurements and formerly published data of locally collected seed weight records together covers over 70% of the Pannonian flora. However, there is still a considerable lack in seed weight data of taxonomically problematic genera, even though they are represented in the Pannonian flora with a relatively high number of species and/ or subspecies (e.g. Sorbus, Rosa, Rubus, Crataegus and Hieracium). Our regional database contains very sporadic data on aquatic plants (including also numerous invasive species reported from Hungary and neighbouring countries) and some rare weeds distributed in the southwestern part of the country. These facts indicate the necessity of further seed collection and measurements.Key words: dry storage, hard trait, herbarium, plant trait, restoration, seed database, seed mass INTRODUCTIONOne of the most easily measurable physical trait of a plant is the weight of its seeds. Seed weight (or referred to also as seed mass) affects the regeneration strategy and the dispersal of plant species both in space (spatial dispersal) and time (development of a seed bank). Seed weight is also strongly related Acta Bot. Hung. 58, 2016 188 TÖRÖK, P., TÓTH, E., TÓTH, K., VALKÓ, O., DEÁK, B., KELBERT, B., BÁLINT, P. et al. to seed predation events (larger seeds are more likely predated), germination processes, seedling establishment and survival (Eriksson 2000). Thus, in the last few decades seed traits (incl. seed weight) became frequently used for explaining crucial dynamical processes in plant communities (Leishman et al. 2001, Moles et al. 2007) and for analysing life trait scenarios (Beaulieu et al. 2007, Moles and Westoby 2003). There is also an increasing trend to collect hard and soft traits into searchable and electronically available databases. This also holds for seed traits, which can be found for the European flora in comprehensive databases, such as BiolFlor (Klotz et al. 2002), BIOPOP (Kleyer 1995), LEDA (Kleyer et al. 2008), TRY (Kattge et al. 2011a, b) the Seed information database SID 7.1 (Kew Botanical Garden, Liu et al. 2008), the Dispersal and diaspore database (Hintze et al. 2013), and the Digital seed atlas of the Netherlands (Cappers et al. 2012). These databases contain data for most of the common European species, especially species with a northwestern or Central European distribution. Species distributed mostly in southern or eastern Europe are generally underrepresented in these databases; thus, providing new, locally collected data on seed weights is a vital task in these regions (see also Csontos et al. 2003, Török et al. 2013. Furthermore, for understanding local and regional seed dispersal and pla...

Abstract. In this paper, we present the HUSEED wild , which is an online seed weight and germination database relying on our investigations concerning the regional seed collection (Pannon Seed Bank) of the Pannonian flora (available at: http://huseed.nodik.hu:8243/en/wild). Our data of 806 taxa (sensu species and subspecies) represent nearly 40% of the Pannonian flora. With our database, we contribute to former Hungarian databases with seed weight data of 50 taxa, and data of 20 taxa are first to be published in Europe. Our database is the first national germination database, and it contributes to European databases with germination data of 228 taxa. Additionally, we exemplify the ecological applicability of the dataset through analysing two plant strategies: (i) life forms and (ii) social behaviour types. Correlations between seed traits and plant strategies are investigated. Our findings are the following: (i) woody plants have significantly higher seed weight and significantly lower germination capacity than herbs (incl. forbs and graminoids); (ii) within herbs, perennials have significantly lower germination capacity than annuals and within forbs, they have significantly higher seed weight as well; (iii) herbaceous ruderals have significantly lower seed weight and significantly higher germination capacity than herbaceous stress tolerants. Our online database is being extended continuously, and its standardised data make it suitable for integration into larger European online databases.

Seed bank collections have multiple benefits: store genetic material for conservation and research, and their data can also provide valuable scientific information. The Pannon Seed Bank was established during an EU LIFE+ project between 2010 and 2014 with the target to collect and store seeds of approx. 50% of the wild native vascular flora of the Pannonian Biogeographic Region, seed accessions of at least 800 storable species. This task was fully achieved by the end of the project, as altogether 1,853 seed accessions of 910 species are stored. The aim of the present paper is to provide access to the collection data and metadata of the Pannon Seed Bank as it was completed by the end of the project. The collection campaign involved about 40 experts and covered the whole country. Collection and storing applied standard methodology, based on the ENSCONET project. The collection data published in this paper can be used manifold. Geographical data on species occurrences are major input for nature conservation and research. Seed collection date is valuable for ecological studies of phytophagous insects, frugivorous birds and mammals, etc. The database can be partner to international databases (like GBIF) or research infrastructures (e.g. LifeWatch). Hopefully, this data paper will contribute to further motivate the development of native seed collections and their use for conservation and research in Hungary.