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Puchalski W.,Pracownia Natury | Cieslak E.,Instytut Botaniki im. Wladyslawa Szafera | Nowak J.,Instytut Botaniki im. Wladyslawa Szafera | Zukowski W.,Adam Mickiewicz University
Fragmenta Floristica et Geobotanica Polonica | Year: 2016

Groenlandia densa (L.) Fourr ranks as critically endangered in Poland. It was noted sporadically until 1987 but has not been confirmed more recently. For this reason, reintroduction of this species to Pomeranian waters (N Poland) from its remaining populations in northern Germany has been planned. This study examined the genetic structure of G. densa, considered the suitability of the remaining German populations as a potential source for its introduction to Poland, and assessed the likelihood of success of such assisted colonisation. A comparison of the genetic structure of all studied populations revealed high genetic similarity and no genetic differentiation between samples from Poland (historical site) and from Germany. This indicates that each studied population from Germany may be used as stock for introduction. At the same time, some mostly uncertain factors leading to the observed recent extinction of G. densa from most of its northern European range, including the declining intensity and quality of groundwater seepage, suggest that the effect of this introduction may be very short-lived.

The paper reports new localities for 22 rare and four more frequent vascular plants in the Puszcza Niepołomicka forest and adjacent areas between the Vistula and Raba rivers. Five plant species are new for the flora of the Puszcza Niepołomicka forest: Anthoxanthum aristatum, Campanula glomerata, Carex tomentosa, Echinops sphaerocephalus and Thymus marschallianus.

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