|
|
Dietary specialisation and diversification of the spider genus Dysdera
Řezáč, Milan ; Pekár, Stanislav (advisor) ; Růžička, Vlastimil (referee) ; Rusek, Josef (referee)
Dtet specia|isatlon and ďverslÍlcatlon oftlrc sf,der genrs Dysdara (Araneae: Dysdertdae) Summaryof PhD. thesis Tho main aim of my sfudy is to pr€s€nt now knowledge aboutthe diet specialisation antldiversiÍicationóf ttreipider genusDys&ra. This PhD. lhesis, ďvided in two parts' is tre summaryof Íivepapers. 1. Diet specialisatlon 1.1. Řezíě M., Pekór s. & I'bin Y.: Morphologlcal and behavlourď adapations for onlscophagr lnDysderassden (Araneae: Dysdertnne) [acoeptedby Journal of Zoologfl Very little is known about predators feeding on woodlioe. Spiders of the genus Dyidera (Dysderidae)were long suspeotedto be onisoophagous,but evidenoefor lheir díetspeoialisation hás beenrlaoking. These spidas are chareotorisedby an unusual morphological variability oftheir mouth-parts,partioularly tho ohelioaae, suggosting dietary sfrcialisation któróukazuje na potavní specializaci. Thus, we investigatedthe rebtiónsirip betweenmouthpertmorphology, prey pÍeferenoeand predatorybelraviour of ťrvespecies represerrtingdiffoent chelioenď types. Resulb obtained sugg€st that sfudiedĎysdera spidas diffo in prey specialisetion for woďlioo. The species with unmodified cheliceraereatlity oapturedvarious artkopďs but refused woodlice while speoieswith modified ohetóeraeoapfuredwoodlice' Particularly,Dysdera erythrina ind D....
|
|
|
Mimicry of hoverflies (Diptera: Syrphidae) in the context of selection pressures from predators, thermoregulation and sexual selection
Daňková, Klára ; Janšta, Petr (advisor) ; Pekár, Stanislav (referee)
Thermoregulation plays an important role in organisms' lives during foraging, escaping from predators, sexual selection or overwintering. Moreover, pressure on efficient thermoregulation could affect species on an evolutionary level and was recently hypothesized to maintain imperfect mimicry in hoverflies (Diptera, Syrphidae). We set these two aims: 1) to study relationships between thermoregulation, mimicry accuracy and resembled model, 2) to closely study effect of developmental temperature in an intermediately accurate honeybee mimic, Eristalis tenax. In the first part of the project, we examined temperature excess of 566 specimens in 47 species of hoverflies in the field. We did not find significant effect of mimicry accuracy on temperature excess in our data. However, we found a strong sexual dimorphism. Females had lower temperature excess, which was very resilient to internal and external factors, whereas males had higher temperature excess, influenced by activity at time of capture (flying > sitting) and resembled model (bumblebee-mimics > honeybee- mimics > wasp-mimics > solitary bee-mimics). We suggest, that males are pushed to higher temperature excess by sexual selection within lekking. In the second part of the project, we reared E. tenax in three different temperatures in laboratory...
|
|
| |
|
|
Dietary specialisation and diversification of the spider genus Dysdera
Řezáč, Milan ; Pekár, Stanislav (advisor) ; Růžička, Vlastimil (referee) ; Rusek, Josef (referee)
Dtet specia|isatlon and ďverslÍlcatlon oftlrc sf,der genrs Dysdara (Araneae: Dysdertdae) Summaryof PhD. thesis Tho main aim of my sfudy is to pr€s€nt now knowledge aboutthe diet specialisation antldiversiÍicationóf ttreipider genusDys&ra. This PhD. lhesis, ďvided in two parts' is tre summaryof Íivepapers. 1. Diet specialisatlon 1.1. Řezíě M., Pekór s. & I'bin Y.: Morphologlcal and behavlourď adapations for onlscophagr lnDysderassden (Araneae: Dysdertnne) [acoeptedby Journal of Zoologfl Very little is known about predators feeding on woodlioe. Spiders of the genus Dyidera (Dysderidae)were long suspeotedto be onisoophagous,but evidenoefor lheir díetspeoialisation hás beenrlaoking. These spidas are chareotorisedby an unusual morphological variability oftheir mouth-parts,partioularly tho ohelioaae, suggosting dietary sfrcialisation któróukazuje na potavní specializaci. Thus, we investigatedthe rebtiónsirip betweenmouthpertmorphology, prey pÍeferenoeand predatorybelraviour of ťrvespecies represerrtingdiffoent chelioenď types. Resulb obtained sugg€st that sfudiedĎysdera spidas diffo in prey specialisetion for woďlioo. The species with unmodified cheliceraereatlity oapturedvarious artkopďs but refused woodlice while speoieswith modified ohetóeraeoapfuredwoodlice' Particularly,Dysdera erythrina ind D....
|
|
|
The Loyalty management concept as a key strategy of productivity and success applied in SKODA AUTO, a. s.
Paleta, Vojtěch ; Hnilica, Jiří (advisor) ; Pekař, Stanislav (referee)
It is not really easy to achieve high level in customer satisfaction regularly. It is not easy to well listen to the consumer's voice. But it is more difficult to achieve a degree of loyalty to the customer become a company promoter. It is very difficult to manage the loyalty. It is very difficult to motivate employees for mutual and effective cooperation and communication. This thesis is an innovative experiment, in which the author tried to create an applicable concept of corporate loyalty management with regard to the analysis of the customer's voice and financial performance of the company. The next author's aim was a creating new perspective on learning organization with created matrix of loyalty management combination. The work is systematically supported by business examples, research and best practices, and it is methodically applicable process for loyalty management applied the example of the car manufacturing corporation SKODA AUTO, Inc.
|
guest ::
RSS feed.