National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Use of individual acoustic monitoring to study endangered species - case study on the Meadow Pipit
Helmbold, Lily Carolin ; Petrusková, Tereza (advisor) ; Beran, Václav (referee)
1 Abstract Monitoring is an essential part and prerequisite for successful conservation measures. Methods used for decades for bird monitoring provide information about species richness and partly use acoustic signals, an important communication tool not only for birds. Unique features of song allow idividual identification, but this knowledge has not yet been captured by traditional monitoring methods, but it is very important for a deeper understanding of the ecology of monitored animals. To identify individuals based on vocalisation, science is increasingly turning to a method called individual acoustic monitoring (IAM), based on unique differences in vocalisation. IAM has so far been used for simpler songs, but its applicability to complex vocalizations would be a valuable complement to traditional monitoring methods. In this paper I therefore address the question of the applicability of individual acoustic monitoring for on-site conservation measures. The study was conducted on a model species of songbird, the meadow pipit (Anthus pratensis), and individuality in song was assessed by subjective analysis of the syllable repertoires of singing males. This is an alternative approach that considers shape similarity instead of discrete syllable values. A total of 168 singing males of three European...
Automimicry-intraspecific variation in antipredatory defences
Stránská, Anna ; Exnerová, Alice (advisor) ; Šulc, Michal (referee)
Aposematic prey is characterized by the fact that individuals are warningly-coloured and unpalatable to predators. However, variability in antipredator defence may occur within one species. The presence of intraspecific variation in antipredator defences is called automimicry. Automimics can be palatable or have a different level of quantity or quality of chemical defence. One of the ways through which the variability arises is for instance consumption of specific plants which defence against predators by means of sequestration. Intraspecific variation in antipredator defence affects the behaviour of predators that can distinguish between palatable of unpalatable prey. Chemical defence is costly for unpalatable individuals. Palatable individuals on the other hand save much energy by simply resembling unpalatable individuals of the same species.

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