Dan Eisikowitch

Learn More
 Nectar and pollen within flowers are usually the primary attractants to floral visitors. Chemical analysis of almond nectar and pollen in this study revealed that they contain the secondary compound amygdalin. Floral display often reflects pollinator characters, and almond flowers are accordingly designated as “bee flowers”. A previous study in Israel(More)
This paper reviews research on the role of electrostatic forces in pollination, both in natural and in agricultural systems. Researchers from various fields of biological studies have reported phenomena which they related to electrostatic forces. The theory of electrostatically mediated pollen transfer between insect pollinators and the flowers they visit(More)
of karyotypic variation in some insular Peromyscus from British Columbia, Canada. Cytologia 38:485-495. WAHRMAN, J., R. GOITEIN, AND E. NEVO. 1969. Evolutionary significance of chromosome variation. Science 164: 82-84. WEBSTER, T. P., W. P. HALL, AND E. E. WILLIAMS. 1972. Fission in the evolution of a lizard karyotype. Science 177:611-613. YOSIDA, T. H.,(More)
A study of olfactory discrimination by honeybee has been set up in order to understand the role of volatiles of the aromatic plant Majorana syriaca in attracting pollinating insects. The honeybee's response to volatiles from leaves and inflorescences of two M. syriaca chemotypes, which differ in the thymol carvacrol ratio of their volatiles, was tested(More)
The flowering biology and pollination ecology ofLoranthus acaciae was studied at Hazeva in the northern Arava Valley in Israel. Flowers at anthesis had red anthers, a red stigma and a green corolla which turned red as a postfloral phenomenon. Their flowering period was approximately 10 months long (from mid-June until mid-April) during which time two main(More)
The genus Capparis is represented in Israel by three taxons of the section spinosa. The pollinators of the three taxa are hawkmoths, crepuscular bees of the genus Proxylocopa and various daily bees. However, the efficiency of the different pollinators is very varied with respect to the individual taxons. Hawkmoths were frequently observed as pollinators of(More)
The effects of the pollen source on fruit and seed traits of Jatropha curcas and on potential biodiesel traits were investigated using analysis of breeding system and reciprocal pollination of various genotypes. The field experiments were carried out under Mediterranean conditions in Bet-Dagan, Israel. The breeding system was investigated by comparison of(More)
Two closely related species ofCapparis, C. ovata andC. spinosa, which are exposed to the same pollination environment were studied. The nectar volume and concentration ofC. ovata are higher than inC. spinosa. Both species have similar pollination efficiency, but the relative contribution of each pollinator is different.C. ovata is pollinated mainly hy(More)
Calotropis procera (Asclepiadaceae) grows in Israel under extremely hot climatic conditions. Flower morphology is adapted towards the concealment of nectar, in order to protect it against robbery by ants and from evaporation. Pollinia while being inserted within the stigmatic chamber, are soaked in the liquid nectar which, by its concentration controls(More)