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Relationships between functional traits, home range sizes, and dispersal abilities in birds
Holubová, Kateřina ; Storch, David (advisor) ; Sedláček, Ondřej (referee)
Avian movements through the landscape involving dispersal and routine movements within home-range or territory are one of the basic but due to a high mobility of birds also one of the least understood processes of bird ecology, especially on the interspecific level. Not only is dispersal a fundamental mechanism of species' spreading into new areas, but also, together with home-range size, it shows the scale on which species perceive the landscape and how they can deal with habitat changes. Dispersal ability, represented by dispersal distances, is determined by a few species specific traits like body size, migratory status, wing and bill morphology, diet type, preferred habitat type or some life-history traits. On the contrary, home-range size variability is determined primarily by energetic demands of the species, given by its body size and trophic level, and by the productivity of the environment. There is a positive relationship between home-range size or territory size, respectively, and dispersal distances of birds that can be attributed to species vagility or their spatial requirements determined especially by their food preference. Nevertheless, further research mainly on interspecific level is necessary for a deeper insight into this issue.
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Scaling of spatial activity in bats
Křemenová, Jana ; Lučan, Radek (advisor) ; Storch, David (referee)
2 ABSTRACT The degree of spatial activity, especially the home-range size, is one of the basic biolog- ical characteristics of animals and whether it has enough resources is crucial for the survival and reproduction of the individual. Therefore, it is not surprising that many studies trying to make clear the effect of various ecological and morphological variables and explain the varia- bility of space activities. Bats are a group of mammals, for which until recently, existed only few information about their spatial activity. However, due to the miniaturization of technology and the use of radiotelemetry amount of information rapidly increasing. The aim of this study was to assemble the most complete information about the home- range size and foraging distance of bats and analyze the effect of variables that can influence the spatial activity. From published papers I collected data on 106 species representing 8 fami- lies. The influence of 6 variables (weight, wing loading, aspect ratio, food specialization, colony size, primary productivity of environment) on home-range size and average foraging distance of bat was analysed by phylogenetic regression (PGLS). The best predictor of the home-range size is the primary productivity of the environment, food specialization and body size. The best explanation of...
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Relationships between functional traits, home range sizes, and dispersal abilities in birds
Holubová, Kateřina ; Storch, David (advisor) ; Sedláček, Ondřej (referee)
Avian movements through the landscape involving dispersal and routine movements within home-range or territory are one of the basic but due to a high mobility of birds also one of the least understood processes of bird ecology, especially on the interspecific level. Not only is dispersal a fundamental mechanism of species' spreading into new areas, but also, together with home-range size, it shows the scale on which species perceive the landscape and how they can deal with habitat changes. Dispersal ability, represented by dispersal distances, is determined by a few species specific traits like body size, migratory status, wing and bill morphology, diet type, preferred habitat type or some life-history traits. On the contrary, home-range size variability is determined primarily by energetic demands of the species, given by its body size and trophic level, and by the productivity of the environment. There is a positive relationship between home-range size or territory size, respectively, and dispersal distances of birds that can be attributed to species vagility or their spatial requirements determined especially by their food preference. Nevertheless, further research mainly on interspecific level is necessary for a deeper insight into this issue.
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