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Aquatic macrophyte communities as bioindicators of eutrophication in calcareous oligosaprobe stream waters (Upper Rhine plain, Alsace)
The results cover a statistical analysis of the correlations between aquatic macrophyte communities and chemical parameters (N−NH4, N−NO3, P−PO4, COD, Temperature, dissolved O2, Cl) in unpollutedExpand
Worldwide invasion by the little fire ant: routes of introduction and eco-evolutionary pathways
The evolutionary genetics of introduced populations of the invasive ant Wasmannia auropunctata at a worldwide scale are studied, and it is suggested that invasive clonal populations may have evolved within human modified habitats in the native range, and spread further from there. Expand
Late Quaternary ice sheet extents in northeastern Germany inferred from surface exposure dating
Abstract We determined in situ cosmogenic 10 Be ages for 11 boulders on the Hoher Flaming ice marginal belt and five boulders on the Gerswalder moraine, a recessional moraine of the Pomeranian stage.Expand
10Be dating of alluvial deposits from Southeastern Iran (the Hormoz Strait area)
Abstract A key area for the understanding of the southeastern Iran geodynamics, the Hormoz Strait area, was investigated. Tectonically active, it provides useful sequences of Quaternary depositsExpand
Genetic structure and reproductive strategy of the ant Cardiocondyla elegans: strictly monogynous nests invaded by unrelated sexuals
It is shown that C. elegans is strictly monogynous, and that its nests can contain foreign sexuals, and the presence of alien sexuals inside ant nests is described for the first time and probably counteracts inbreeding resulting from matings between siblings. Expand
Paleomagnetic evidence for Neogene rotational deformations in the Aegean domain
New paleomagnetic data are reported from the islands of Skyros and Lesbos in Central Aegea and the Izmir-Foca region in Western Anatolia. Together with previous results obtained in NorthwesternExpand
Ritualised versus aggressive behaviours displayed by Polyrhachis laboriosa (F. Smith) during intraspecific competition
Ritualised displays seem to compensate in part the archaic semi-claustral mode of foundation of this species, as the queens are indirectly protected by their conspecifics who do not tolerate other competitors around large food sources. Expand
Early learning of volatile chemical cues leads to interspecific recognition between two ant species
It is hypothesize that callow M. rubida workers in the mixed-species groups had become imprinted by the above alkanes (in particular undecane, being the major heterospecific volatile in the head space) and incorporated them into their own template. Expand
Individual flexibility and choice of foraging strategy in Polyrhachis laboriosa F. Smith (Hymenoptera, Formicidae)
The tree-dwelling African ant Polyrhachis laboriosa (Formicinae) uses different foraging strategies according to the size of the available food sources, and it is demonstrated that a recruitment behaviour can be induced with a 125 μl alimentary reward and that foraging remains solitary when rewards are smaller. Expand