Search results for "Misis"
showing 3 items of 3 documents
Skaistumkonkursu aktualitāte un izpratne Latvijas sabiedrībā
2020
Skaistumkonkursu vēsture Latvijā jau ir meklējama 1988. gadā, kad norisinājās pirmais skaistumkonkurss – „Miss Rīga”. Bakalaura darba mērķis ir izprast Latvijas sabiedrības viedokli un izpratni par skaistumkonkursiem un to norises nepieciešamību Latvijā, kā arī padziļinātāk izprast skaistumkonkursa būtību, un iespējamos ietekmes virzienus uz sabiedrību. Teorētiskajā daļā tiek aplūkoti: feminisms, reprezentācija, skaistumkonkursi, skaistumkonkursu sieviešu standarti, skaistumkonkursu ietekme uz modes pasauli, skaistumkonkursu ietekme uz veselību, lai empīriskajā daļā varētu veikt salīdzinājumu, kā bija pagātnē un kā ir tagadnē. Empīriskajā daļā tiek noskaidrots skaistumkonkursa nozīmīgums no…
Interspecific interactions and premating reproductive isolation
2008
Interspecific interactions have several evolutionary consequences: for example, two species may compete, hybridize, or behave aggressively towards each other, or there may be predator–prey interactions. One consequence of these interactions is the evolution of premating reproductive isolation between the two species. The most obvious interspecific interaction, which has an effect on reproductive isolation, is the avoidance of hybridization, or, in other words, the reinforcement process. The theory of reinforcement states that when hybridization is maladaptive, selection pressure causes a divergence in female mate preference and/or in male secondary sexual characters. It is often assumed tha…
Do allopatric male Calopteryx virgo damselflies learn species recognition?
2012
There is a growing amount of empirical evidence that premating reproductive isolation of two closely related species can be reinforced by natural selection arising from avoidance of maladaptive hybridization. However, as an alternative for this popular reinforcement theory, it has been suggested that learning to prefer conspecifics or to discriminate heterospecifics could cause a similar pattern of reinforced premating isolation, but this possibility is much less studied. Here, we report results of a field experiment in which we examined (i) whether allopatric Calopteryx virgo damselfly males that have not encountered heterospecific females of the congener C. splendens initially show discri…