Počet záznamů: 1
Macrophyte assemblages in fishponds under different fish farming management
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$a Francová, Kateřina, $d 1983- $7 mub2011650934 $4 dis 245 10
$a Macrophyte assemblages in fishponds under different fish farming management = $b Makrofyta v rybnících s různým typem rybářského hospodaření / $c Kateřina Francová 246 31
$a Makrofyta v rybnících s různým typem rybářského hospodaření 264 -1
$a Vodňany : $b Fakulta rybářství a ochrany vod, Jihočeská univerzita v Českých Budějovicích, $c 2020 300 $a 82 stran : $b ilustrace, mapy ; $c 24 cm 336 $a text $b txt $2 rdacontent 337 $a bez média $b n $2 rdamedia 338 $a svazek $b nc $2 rdacarrier 502 $a Teze disertace (Ph.D.)--Jihočeská univerzita v Českých Budějovicích, Fakulta rybářství a ochrany vod, 2020 504 $a Obsahuje bibliografie 520 3-
$a "Artificial fishponds have been an integral part of the European landscape for centuries. In addition to fish production, they provide important ecosystem services and habitats for biota, including macrophytes. The processes influencing macrophyte assemblages in fishponds are poorly understood and thus they were in the focus of this research. The opening study introduces thesis with a review of available information of historical development of fishponds and relation between fish farm management practices and fishpond macrophyte assemblages. Relevant socio-economic factors and possible effects of climate change are also explored. Comparison with similar wetland habitats shows that fishponds represent valuable systems harbouring many macrophyte species and a range of their rare and threatened taxa. The following study focuses on seasonal and inter-annual differences in vegetation in open water zones of nursery and main fishponds. The results show significant effect of the fishpond use type on macrophyte assemblages with strong decrease in macrophyte species numbers and abundance with increasing fish stock pressure. Stands of aquatic macrophytes commonly more developed in the nursery ponds in the spring of the first year of the production cycle, but variability could be found between ponds for example due to lower water level. While the results showed distinctions in water chemistry, sediment thickness, and adjoining land use, only transparency exerted a significant effect on macrophyte assemblages. Differences in other measured parameters were probably too small to be reflected in macrophyte species composition. Additionally, most macrophytes in our dataset show a broad ecological range. The last part of thesis reports analyses of plant species of reed bed and exposed bottom zones in the same selection of fishponds. As observed in the study of the open water zone, the highest species numbers and abundance were observed in the nursery ponds. The plants of reed beds were mostly affected by the width of the zone and shore slope. Lower slope in most fishponds often allowed development of the dense stands of Phragmites australis, which are highly competitive. They affect light and nutrient availability, produce a high amount of litter and so limit occurrence of other species. This as well as a position in the upper part of littoral, where they might not be affected by fish or water level disturbances so often, led to similarities in reed bed zones between fishpond types. In contrast more open reed bed stands with species such as Typha angustifolia and exposed bottoms allowed development of more species. The plants of exposed bottoms were affected by fishpond use type and adjoining land use type. The reason is lower fish stock pressure and more regular summer and/or winter drainage. Some fishponds or their parts did not have reed beds and exposed bottoms were then directly connected and influenced by surrounding landscape, e.g. ruderal and grassland species such as Barbarea vulgaris and Taraxacum sect. Ruderalia regularly occurred there. Application of fish farming practices is important not only as it is a part of the national heritage, but also to avoid pond terrestrialization. However, modification of farming techniques to best suit individual pond conditions and to adapt to climate change is recommended. Reducing fish stock density when relevant and limiting nutrient input from manuring and supplemental fish feeding may aid recovery of fishpond ecosystems including macrophyte species assemblages." In FRANCOVÁ, Kateřina. Macrophyte assemblages in fishponds under different fish farming management =: Makrofyta v rybnících s různým typem rybářského hospodaření. Vodňany: Fakulta rybářství a ochrany vod, Jihočeská univerzita v Českých Budějovicích, 2020. 82 stran. ISBN 978-80-7514-103-3. $c okcz $u https://www.obalkyknih.cz/view?isbn=9788075141033 $2 OKCZ - ANOTACE Z WEBU 546 $a České a anglické resumé 650 07
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$a Jihočeská univerzita. $b Fakulta rybářství a ochrany vod $7 ko2010583058 $4 pbl 910 $a CBA001 FMT BK
Počet záznamů: 1