New alien plant species recorded in the southern regions of Latvia / Pietiniuose Latvijos rajonuose aptiktos naujos svetimžemės augalų rūšys

Abstract

Alien plants are one of the most dynamic and rapidly changing components of flora. Many intentionally introduced plants, which formerly were in cultivation only, now are increasingly found escaped and occur in anthropogenic or seminatural habitats. During field investigations in the southern districts of Latvia in 2014-2016, six new alien plant species were recorded: Allium nutans, Hylotelephium spectabile, Solidago ×niederederi, Symphyotrichum dumosum, S. lanceolatum and S. novae-angliae. To date, four species, Allium nutans, Hylotelephium spectabile, Symphyotrichum dumosum and S. novae-angliae, occur as casual aliens in Latvia. Solidago ×niederederi should be ascribed to the group of established species, whereas Symphyotrichum lanceolatum has naturalized and is potentially invasive. Notes on morphology and identification of species as well as characteristics of the recorded populations are discussed. A note on 20 other alien plant species recorded in wastelands, abandoned meadows and unused arable fields in the south-western part of Daugavpils city is also provided.

Seed germination in Solidago ×niederederi (Asteraceae) and its parental species after two different fruit storage periods

“…However, its establishment and invasive potential are poorly recognized. It usually occurs in anthropogenic habitats such as abandoned fields, disused sand and limestone quarries, roadside slopes, railway embankments and tree plantations, where S. canadensis and S. virgaurea are found in close proximity (Pliszko 2013;Stace et al 2015;Gudžinskas & Petrulaitis 2016;Pagitz 2016;Pliszko & Zając 2016). It is able to reproduce generatively by wind-dispersed achenes; however, its fruit set is limited due to reduced pollen viability (Migdałek et al 2014;Karpavičienė & Radušienė 2016).…”

Synflorescence regeneration after cutting in Solidago ×niederederi (Asteraceae), a hybrid between invasive S. canadensis and native S. virgaurea

“…The study area is located in a temperate zone with an influence of the continental climate. In this place, the average annual air temperature is about 6°C and the average annual precipitation is about 600 mm (Górniak 2000). The presence of Solidago ×niederederi near Suwałki has been recently confirmed as a result of the ongoing invasion of S. canadensis in northeastern Poland .…”

Predicting the potential distribution area of Solidago ×niederederi (Asteraceae)

“…Therefore, we selected a total of 83 records (GPS coordinates in the WGS84 system), keeping a minimum distance of 1 km between hybrid occurrence points. The records from Austria and Latvia were obtained from the literature (Pagitz and Lechner-Pagitz, 2015;Gudžinskas and Petrulaitis, 2016), whereas those from Poland were gathered from field surveys conducted by Artur Pliszko in 2013-2016. The records from Lithuania were contributed by Birutė Karpavičienė in accordance with published data (Viltrakytė and Karpavičienė, 2014;Karpavičienė and Radušienė, 2016).…”