Trees Are a Major Foraging Resource for Honeybees in the City.

Large cities are typically characterized by a mosaic of green spaces that hold a remarkable variety of native and "exotic" plants. Urban beekeeping has gained increasing popularity. In order to characterize the "urban" in the honey, pollen diversity in 50 honey samples from 18 apiary locations in Vienna, Austria, was microscopically analyzed.

Origin and Early Evolution of Hydrocharitaceae and the Ancestral Role of .

The combined morphological features of (Hydrocharitaceae) pollen, observed with light and electron microscopy, make it unique among all angiosperm pollen types and easy to identify. Unfortunately, the plant is (and most likely was) insect-pollinated and produces relatively few pollen grains per flower, contributing to its apparent absence in the paleopalynological record. Here, we present fossil pollen from the Eocene of Germany (Europe) and Kenya (Africa), representing the first reliable pre-Pleistocene pollen records of this genus worldwide and the only fossils of this family discovered so far in Africa.

Niche evolution in a northern temperate tree lineage: biogeographical legacies in cork oaks (Quercus section Cerris).

Background And Aims: Cork oaks (Quercus section Cerris) comprise 15 extant species in Eurasia. Despite being a small clade, they display a range of leaf morphologies comparable to the largest sections (>100 spp.) in Quercus.

Cenozoic migration of a desert plant lineage across the North Atlantic.

Previous paleobotanical work concluded that Paleogene elements of the sclerophyllous subhumid vegetation of western Eurasia and western North America were endemic to these disjunct regions, suggesting that the southern areas of the Holarctic flora were isolated at that time. Consequently, molecular studies invoked either parallel adaptation to dry climates from related ancestors, or long-distance dispersal in explaining disjunctions between the two regions, dismissing the contemporaneous migration of dry-adapted lineages via land bridges as unlikely. We report Vauquelinia (Rosaceae), currently endemic to western North America, in Cenozoic strata of western Eurasia.

New Fagaceous pollen taxa from the Miocene Søby flora of Denmark and their biogeographic implications.

Premise: The Fagaceae comprise around 1000 tree species in the Northern Hemisphere. Despite an extensive fossil pollen record, reconstructing biogeographic patterns is hampered because it is difficult to achieve good taxonomic resolution with light microscopy alone. We investigate dispersed pollen of Fagaceae from the Miocene Søby flora, Denmark.

Messinian vegetation and climate of the intermontane Florina-Ptolemais-Servia Basin, NW Greece inferred from palaeobotanical data: how well do plant fossils reflect past environments?

The late Miocene is marked by pronounced environmental changes and the appearance of strong temperature and precipitation seasonality. Although environmental heterogeneity is to be expected during this time, it is challenging to reconstruct palaeoenvironments using plant fossils. We investigated leaves and dispersed spores/pollen from 6.

Combined LM and SEM study of the middle Miocene (Sarmatian) palynoflora from the Lavanttal Basin, Austria: Part V. Magnoliophyta 3 - Myrtales to Ericales.

The continued investigation of the middle Miocene palynoflora from the Lavanttal Basin reveals numerous additional angiosperm taxa. The Myrtales to Ericales pollen record documented here comprises 46 different taxa belonging to Onagraceae (), Ericaceae (), Anacardiaceae (), Rutaceae (), Sapindaceae (), Santalaceae (), Amaranthaceae, Caryophyllaceae, Polygonaceae (), Cornaceae (), Ebenaceae (), Ericaceae (), Sapotaceae (), Styracaceae () and Symplocaceae (). Köppen signatures of potential modern analogues of the additional fossil woody elements confirm the hypothesis of a subtropical () climate at lower elevations and subsequent transition into a temperate climate with altitudinal succession ( → / → → → -climate).