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Ecology of pollination networks
Hadrava, Jiří ; Janšta, Petr (advisor) ; Novotný, Vojtěch (referee)
In communities, plants and pollinators are organized into complex network of relations. Description of structure in this network can contribute to understanding of community dynamics and persistence of biodiversity. Better understanding of patterns in assemblages of plants and pollinators may also help in their protection. The aim of this work is to review recent methodological principles in the pollination network analyses and to show potential problems in concept of ecological networks. Graph theory is breefly summarized and applied to the description of pollination networks. As an example, results on comparison of communities from different geographical sites are given.
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Influence of landscape fragmentation on characteristics of pollination networks in meadows
Filip, Jan ; Tropek, Robert (advisor) ; Storch, David (referee)
Traditionally managed semi-natural grasslands are unique for their high plant species richness. Pollinators are crucial for maintaining this plant biodiversity. Plant-pollinator interactions of these grasslands are influenced by habitat fragmentation since the 20th century. Main drivers of this landspace disturbance are abandonment and agricultural usage. Network analysis of structural characteristics changes in plant-pollinator interactions can facilitate understanding of habitat fragmentation and its impacts on pollination interactions.
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Influence of landscape fragmentation on characteristics of pollination networks in meadows
Filip, Jan ; Tropek, Robert (advisor) ; Storch, David (referee)
Traditionally managed semi-natural grasslands are unique for their high plant species richness. Pollinators are crucial for maintaining this plant biodiversity. Plant-pollinator interactions of these grasslands are influenced by habitat fragmentation since the 20th century. Main drivers of this landspace disturbance are abandonment and agricultural usage. Network analysis of structural characteristics changes in plant-pollinator interactions can facilitate understanding of habitat fragmentation and its impacts on pollination interactions.
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Spatial Variability in Pollination Networks
Hadrava, Jiří ; Janšta, Petr (advisor) ; Keil, Petr (referee)
Plant-pollinator interaction assembly can be represented as so called pollination network. Using these networks, assembly of plant-pollinator communities and geographic patterns in pollination networks can be studied. During last years, a great progress in describing patterns in structure of plant-pollinator interaction webs and in describing their spatial variability was made. However, these results are mostly based on data from previous studies, which are not seamlessly comparable due to their nonuniformity. My thesis aims at the methodological concepts of study on pollination networks. Based on meta- analysis of previously published data and on data from four years detailed study of plant-pollination system from one locality, I show several methodological problems caused by dissimilarities in sam- pling method of current pollination-network data. These dissimilarities could be responsible for some observed patterns in the assembly of pollination networks. Thus, I propose a uniform method for observing pollination networks suitable for macroecolo- gical meta-analyses (pollination network samples). I tested this method in the field and I described 49 pollination networks from the central and eastern Europe by using such method. In these ne- tworks, no nonrandom structure character such as...
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Ecology of pollination networks
Hadrava, Jiří ; Janšta, Petr (advisor) ; Novotný, Vojtěch (referee)
In communities, plants and pollinators are organized into complex network of relations. Description of structure in this network can contribute to understanding of community dynamics and persistence of biodiversity. Better understanding of patterns in assemblages of plants and pollinators may also help in their protection. The aim of this work is to review recent methodological principles in the pollination network analyses and to show potential problems in concept of ecological networks. Graph theory is breefly summarized and applied to the description of pollination networks. As an example, results on comparison of communities from different geographical sites are given.
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