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The reproductive characteristics of Erodium somanum (Geraniaceae), a critically endangered endemic species, were investigated in order to evaluate the main factors that affect its reproductive success and to evaluate their importance on its conservation. The estimated pollen/ovule ratio was calculated as 1187. | Turkish Journal of Botany http://journals.tubitak.gov.tr/botany/ Research Article Turk J Bot (2017) 41: 171-179 © TÜBİTAK doi:10.3906/bot-1603-9 Reproductive biology of the critically endangered endemic plant Erodium somanum in Turkey Dilek OSKAY* Department of Biology, Faculty of Science and Arts, Celal Bayar University, Manisa, Turkey Received: 04.03.2016 Accepted/Published Online: 16.11.2016 Final Version: 03.04.2017 Abstract: The reproductive characteristics of Erodium somanum (Geraniaceae), a critically endangered endemic species, were investigated in order to evaluate the main factors that affect its reproductive success and to evaluate their importance on its conservation. The estimated pollen/ovule ratio was calculated as 1187. Pollen viability and stigma receptivity experiments showed that stigma receptivity and pollen viability were high and synchronous throughout the anthesis. E. somanum is a strictly dioecious species and pollinated by insects. Flower visitors in the studied populations were mostly beetles and ants. The average percentage of fruit formation for each plant was determined as 46%. Capacity of seed production for each plant was 36%. Seed viability and germination success were determined as 81% and 80%, respectively. When combined, the capacity of viable and germinative seed production for each plant was determined as 29%. The factor that most affects the reproductive success is thought to be the low density of pollinators. With the direct and indirect effects, population viability seems considerable. Key words: Erodium somanum, reproductive biology, endangered endemic species, dioecious plant, conservation needs 1. Introduction Turkey is located within the Mediterranean basin, which is one of the Mediterranean climate regions. All Mediterranean climate regions have a high number of rare and locally endemic taxa (Cowling et al., 1996). In terms of the number of plants, Turkey is one of the important regions in the Mediterranean basin.
