Erster Nachweis der Solitärbienenart Colletes halophilus Verhoeff, 1944 in Schleswig-Holstein (Hymenoptera: Colletidae)

Die an der Küste endemische Seidenbienenart Colletes halophilus Verhoeff, 1944 konnte 2015 erstmals am Deich der Eidermündung (Nordfriesland) für Schles- wig-Holstein nachgewiesen werden. In 2017 konnte zusätzlich in Salzwiesen vor St. Peter-Ording eine Population ausfindig gemacht werden. Bisher gab es für Deutschland lediglich Funde an der Küste Niedersachsens und den vorgelagerten Inseln. Die Neufunde werden im Kontext der Gesamtverbreitung von C. halophilus und dem Vorkommen ihrer bevorzugten Pollenquelle, der Strandaster (Aster tripolium), diskutiert.

Germination specialities of some saline plant species

Seeds of Achillea aspleniifolia, Artemisia santonicum, Aster tripolium subsp. pannonicum, Inula britannica, Limonium gmellinii subsp. hungaricum and Podospermum canum were collected from five different sodic habitats in Hungary: Apajpuszta, Cegléd, Dinnyés, Farmos and Fülöpszállás. We compared the germination percentage and rate among the populations and determined the optimal sowing depth and substrate preference. We observed big differences among the species and even the habitats. Outstanding dynamics was measured for Achillea aspleniifolia and Artemisia santonicum species. Highest germination percentage was reached by Podospermum canum. Germination stress-tolerance index was the highest for Podospermum canum, while the lowest was determined for Inula britannica. The germination rate of the species did not reach the volumes reported in the publications. The majority of species germinated in light, optimal substrate was seedling growing medium. Podospermum canum proved to be a highly stress-tolerant species.

Two rare halophyte species: Aster tripolium L. and Plantago maritima L. on the Baltic coast in Poland – their resources, distribution and implications for conservation management

The paper presents the results of geobotanical studies on the distribution and resources of Aster tripolium L. and Plantago maritima L, two rare halophytes in Poland. The research was conducted in northern Poland, along the Baltic coast in 2013. The present distribution of the two species was compared with historical data and general trends of and threats to these two species were examined. In total, 33 sites of A. tripolium and 18 of P. maritima were found in the research area. The resources of both species have been perceptibly depleting during last 150 years, which is mostly due to human agencies (e.g. habitat devastation caused by growing urban areas and the change in management and/or habitat condition). In order to preserve both species, it may be necessary to start an ex situ conservation program.