National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Species traits of soil fauna and ecosystem functions during recovery after major disturbances
Salazar Fillippo, Andres Alberto ; Frouz, Jan (advisor) ; Tajovský, Karel (referee) ; Józefowska, Agnieszka (referee)
Growing evidence indicates that interactions between above and belowground communities are essential for healthy and functioning ecosystems. This, however, has exposed a disproportionate knowledge gap in soil communities, which remain poorly understood both at a taxonomic and ecological level when compared to their aboveground counterpart. Studying assembly processes of communities along with structuring forces driving these changes facilitate observing key dynamics within the ecosystem. For this reason, three out of four manuscripts included in the current thesis focus on chronosequences in different successional stages after restoration of major disturbances. The first chronosequence consisted of four sites (10 years, 30 years, 50 years, and a >100 years reference site) in heathlands restored using top-soil removal from North- East Belgium. Here I studied trait assemblages of oribatid mite communities that revealed different ecomorphological groups changing with time during succession, and we also quantitatively assessed the contribution of phoresy via rodents to the dispersal of oribatid mites between restored sites. In the second chronosequence on spoil heaps from the mining district of Sokolov (Czech Republic) with sites ranging from 1 to 41 years, I identified explicit relationships between...
Role of habitat complexity and predation in the structuring of aquatic communities
SOUKUP, Pavel
This thesis focuses on the roles habitat complexity and predation play in the structuring of aquatic communities. Chapter one provides an overview of the way habitat complexity structures communities separately, and by altering predator prey interactions in all aquatic habitats. The following two chapters examine their combined effects using different predator-prey pairs and time scopes: short-term laboratory experiments and a medium-term mesocosm experiment.
Habitat complexity and predation risk effects on community assembly in small standing waters
SOUKUP, Pavel
The effects of habitat complexity and predation risk on community assembly in small standing waters are reviewed. Both lethal and nonlethal predator effects are discussed. Emphasis is put on the role of omnivorous predators which do not fit into the standard food chain model. The review is complemented by a manuscript intended for publication in Freshwater Biology. It reports the results of a mesocosm experiment focusing on the effects of both lethal and nonlethal predation risk, induced by the invasive crayfish species Orconectes limosus, and habitat complexity on the abundance and biomass of macroinvertebrates in a naturally assembled community.

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