118 research outputs found
The permanence of density waves of galaxy and the numerical investigation of waser mechanism
No full textThis paper deals with in detail the permanence of the spiral structure of galaxies andthe characters of waser mechanism. A simplified model of galaxy is adopted. Variousdynamical characters of density waves are studied using numerical calculation method. Theresults verify very well the switch character f waser and the tunnel effect of density wavesat the potential barrier of corotation circle as is shown in a previous work of the author
Waser, CaraDonna, Price data
No full textThese are raw data on nectar properties of flowers and on hummingbird feeding rates at the flowers from field observations from 1970s though 2010s, to accompany Waser, CaraDonna, and Price MS 58156R1 In Press in The American Naturalist ("Atypical flowers can be as profitable as typical hummingbird flowers"). The data are hand-written on data paper as the original data were taken. Note that the Greek letter lambda refers to the capacity of the Drummond microcap used to extract nectar, e.g., 5 lambda = 5 ul capacity. Each microcap capacity has a fixed length (1, 2, and 5 = 32mm long, 10 = 41mm); this is essential to know in converting mm of nectar to microliters of nectar. Sites referred to on the data sheets are explained in Table 1 of the manuscript
Typology in pollination biology: lessons from an historical critique
No full textTypological schemes that describe putative floral adaptations for pollinators have played a central role in pollination biology. In 1882 the prominent German botanist and Darwinist Hermann Müller commented critically on a precursor of modern versions of such “pollination syndromes” that had been developed by his Italian colleague Federico Delpino. Delpino also was a self-proclaimed Darwinist, but in fact adhered to teleology— explanation beyond nature. As a consequence he viewed his typology as reflecting a deeper ideal and thus as rigidly true, and rejected as unimportant any visitors to flowers that it did not predict. Although Müller also classified flowers as to pollinators, he considered such schemes to be fallible, and pondered what diversity and variation in floral visitors might mean. Müller’s comments, which we translate here, are of interest given that appeals to teleology have resurfaced from time to time in discussions of pollination syndromes, and more importantly because his warning against taking typological schemes too literally remains valid. Typology is a useful tool in biology, including pollination biology, but care must be taken that it does not replace nature as perceived realit
Shifts between bee and bird pollination
No full textThis is a story about change and lack of change. The subjects are penstemons.\ud
The flowers of certain closely related penstemons differ dramatically, whereas\ud
certain distantly related species are eerily similar. This is due to the repeated evolution\ud
of hummingbird pollination from bee pollination. Our chapter explores\ud
the biology surrounding these evolutionary shifts. Our chapter shall be an overview of studies done by ourselves and others on\ud
penstemon floral evolution as it pertains to shifts from bee to bird pollination.\ud
Detailed accounts of the methods and analyses have been or will be published\ud
elsewhere. The research program that we outline is intended to not merely document\ud
the extent to which plants conform to lists of syndrome characteristics. We\ud
take the opportunity here to focus on the evolutionary mechanisms that cause\ud
syndrome shifts, just as others have done for evolutionary shifts from outcrossing\ud
to selfing, from homostyly to heterostyly, from blooming early to blooming\ud
late, and from semelparity to iteroparity
Shifts between bee and bird pollination
No full textThis is a story about change and lack of change. The subjects are penstemons. The flowers of certain closely related penstemons differ dramatically, whereas certain distantly related species are eerily similar. This is due to the repeated evolution of hummingbird pollination from bee pollination. Our chapter explores the biology surrounding these evolutionary shifts. Our chapter shall be an overview of studies done by ourselves and others on penstemon floral evolution as it pertains to shifts from bee to bird pollination. Detailed accounts of the methods and analyses have been or will be published elsewhere. The research program that we outline is intended to not merely document the extent to which plants conform to lists of syndrome characteristics. We take the opportunity here to focus on the evolutionary mechanisms that cause syndrome shifts, just as others have done for evolutionary shifts from outcrossing to selfing, from homostyly to heterostyly, from blooming early to blooming late, and from semelparity to iteroparity.Flora and Ecology of the Santa Monica Mountains Southern California Botanists Special Publication 4: 63-94978-022687400
Disputationis theologicae, in caput X. confessionis Helveticae, pars posterior : de praedestinatione Dei et electione sanctorum
No full textquam ... sub praesidio ... Ioh. Henrici Heideggeri ... publicae ... subiicit Thomas Veres-Egyhazi, Hungarus, author & defendens ...Dedikation an Joh. Caspar Waser, Joh. Rudolf Hospinian, Joh. Caspar Schweizer, Joh. Heinrich Lavater, Joh. Heinrich Heidegger, Johannes Lavater, Conrad Burckhard, Joh. Jacob Müller, Johannes Müller, Joh. Ulrich Bulodius und Joh. Heinrich Hottinger auf Bl. A1v.Text teilw. arab. und hebr.Diss. Hohe Schule Zürich, 167
Pollinator behavior and plant speciation: looking beyond the “ethological isolation” paradigm
No full text
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