challenge hypothesis (Wingfield ..

Impressive advances have been made over the last twenty years to unravel the genes underlying the strikingly conserved floral general organisation, besides the extraordinary variation in size, shape, colour and number of floral organs. Evo-devo (evolutionary developmental biology) studies have shown that this conservation is due to a shared genetic program (the ABC model) responsible for floral organ identity. Progress has also been made in identifying genes involved in specific floral features, such as for example floral bilateral symmetry. In parallel, phylogenetic relationships among the 400 families of angiosperms have become increasingly resolved, providing a robust framework to study patterns of floral evolution and development, and distinguish conserved from lineage-specific patterns. This symposium will highlight several aspects of current research led on these aspects, on various taxonomic groups. Proposed speakers include Oriane Hidalgo (UK) who will focus on the evolution and development of the capitulum in Asteraceae, Nina Gabarayeva (Russia) who will zoom on pollen development in a selection of species, Julien Massoni (Zürich) who will present new hypotheses on the evolution of floral structure in Magnoliidae, and Javier Fuertes (Spain) who will address the issue of pseudanthial evolution.

the challenge hypothesis (Wingfield ..

Results from such studies have resulted in the development of the challenge hypothesis, ..
Photo provided by
Flickr

The challenge hypothesis (Wingfield et al

The question remains, what were the specific charges which decided Lady Byron and Lushington? A happy marriage between persons so little congenial would have surprised his best friends. So far we might well accept the statement which Moore assigns to him: ‘My dear sir, the causes were too simple to be easily found out.’ But this will not explain Lady Byron's statements at the time, nor the impression made upon Lushington by her private avowal. Lady Byron only exchanged the hypothesis of insanity for that of diabolical pride. Byron's lifelong habit of ‘inverse hypocrisy’ may account for something. Harness reports that he used to send paragraphs to foreign papers injurious to his own character in order to amuse himself by mystifying the English public. Some of Lady Byron's statements may strengthen the belief that she had taken some such foolish brags too seriously.

modeled by the Challenge Hypothesis (Wingfield et ..

Another suggestion made by Mr. Jeaffreson, that the cause was a connection formed by Byron about the time of the first separation with January Clairmont, daughter, by a previous marriage, of William Godwin's second wife, seems quite inadmissible. It entirely fails to explain Lady Byron's uniform assertions at the time and in 1830 that Byron had been guilty of conduct excusable only on the ground of insanity, and continued during their whole cohabitation. Byron's extreme wrath against a Mrs. Clermont (a former governess of Lady Byron's), whom he accused of breaking open a desk, seems to suggest that some discovery was made subsequently to Lady Byron's departure from London, but affords no confirmation of this hypothesis.

Correlates of androgens in wild male Barbary macaques: Testing the challenge hypothesis
Photo provided by
Flickr

Challenge hypothesis - an overview | ScienceDirect Topics

The Compositae (Asteraceae) are the largest and most diverse flowering plant family (ca. 24,000 spp/ 1,700 genera). Members occur worldwide in all but the most extreme habitats, reaching their greatest numbers in arid and temperate regions and on tropical and subtropical mountains. While many species have restricted ranges in areas that are threatened with high extinction rates (i.e., Pacific Islands, Cape Floristic Region, Tibetan Plateau), the family also includes some of the world’s most noxious weeds (i.e., dandelion, ragweed, thistle) some of which cost the billions (in USD) annually. Numerous species produce novel secondary compounds that have many industrial and biomedical uses and others have been domesticated for food. In 2009 a comprehensive book was published that resolved some issues but left many questions unanswered, however, it triggered substantial new research based on new fossil and morpholgoical evidence including phyloginies and character evolution studies based on next generation methods such as gene target enrichment. It has been hypothesized that Compositae originaled in South America and experienced a subsequent explosion in Africa afterward moving across the globe. But details of how members of the family arrived in Africa, and when taxa moved out of Africa to Asia and then reached most parts of the earth are currently being tested with new phylogenies and factors that may drive their evolution are being investigated. Resolving the history of this large and complicated family is critical to our efforts to understand the assembly of global biodiversity. This symposium will bring together the current state of our knowledge on the phylogeny, biogeography and evolution of Compositae and help develop a strategy for future research.

Male and female cooperatively breeding fish provide ..

...ore contentious. Classical views suggest that androgens are incompatible with parental care behaviors because they mediate aggressive male–male interactions in competitions for mates and territories (=-=Wingfield et al., 1987-=-, 1990). This ‘challenge hypothesis’ has been supported by studies in a variety of taxa, most notably birds (e.g. Silverin, 1980; Oring et al., 1989; Dittami et al., 1991; Ketterson andNolan, 1992; Sm...

Glosa Inter-Reti Diktionaria Glosa Internet Dictionary Glosa-English

INTERPRETATION, INTERRELATIONSHIP AND REPRESENTATION OF PLANTS AS SYMBOLS IN DIFFERENT CULTURAL EXPRESSIONSAll cultures have some myth or tales related with nature and humans. In the context of the social imagination, mankind has taken the plants as symbols and endowed them with an extraordinary and powerful personality. The genetic or ancestral memory, the racial memory as well as the cultural memory of society, play a fundamental role in the perception of plants and in the creation of myths about them. Ancestral myths evolve, regress and get new perception through time and come up to our days with the same power they have born. The Symposium I am proposing will cover several aspects of the interpretation of the plant as a symbol in different cultural expressions such mythology, literature, fiction novel, poetry, religion, music, graphic arts, horoscope and others. This field of work is very exciting because there are several connections between plants and cultures, such as this example among others: 1) Citing of plants in mythological tales; 2) Genera, species or other taxonomic range given by botanists in honor to mythological characters; 3) Botanical terms related to mythology; 4) Mythological gods or goddesses associated with nature, trees, gardens and orchards; 5) Metamorphosis of mythological characters in plants; 6) Plants as symbolic elements of feelings in joyful and sad moments; 7) Plants in different religions; 8) Plants or flowers in poems and songs; 9) Flowers in literary works, films and operas; 10) Plants in horoscopes; 11) Plants used in comics and cartoons; 12) Plants as elements of luck, misfortune or power in different cultures; 13) Plants names used metaphorically in slang language to define attitudes or moods; 14) Plants represented through the eyes of the artists.