Zobrazeno 1 - 10
of 13
pro vyhledávání: '"Roumen Kalchev"'
Autor:
Teodora TRICHKOVA, Dobrina TEMNISKOVA-TOPALOVA, Maya STOYNEVA, Galerida RAIKOVA-PETROVA, Wesselin NAIDENOW, Milena HRISTOZOVA, Ivan BOTEV, Roumen KALCHEV
Publikováno v:
Journal of Limnology, Vol 63, Iss 1, Pp 90-100 (2004)
The high mountain lakes in the Rila Mountains (Bulgaria) were studied in the years 2000 and 2001 considering the following groups of variables: geography, geology, morphology, hydrology, water chemistry of the pelagial, biomass and size structure of
Externí odkaz:
https://doaj.org/article/7c86d369ae7e42999be5bb47e317c085
Publikováno v:
Ecohydrology & Hydrobiology. 20:123-133
The composition and structure of macrophyte assemblages in different water bodies from Bulgarian Danube River catchment area for a period of three years were studied. Main environmental variables: water depth and transparency, substrate type, nutrien
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9498d42c4fbdc741e7c395a046af2968
https://doi.org/10.1016/j.ecohyd.2019.06.003
https://doi.org/10.1016/j.ecohyd.2019.06.003
Autor:
Anita Kiss, Edit Ágoston-Szabó, Hristina Kalcheva, Roumen Kalchev, Mária Dinka, Michaela Beshkova, Árpád Berczik
Publikováno v:
Transylvanian Review of Systematical and Ecological Research, Vol 18, Iss 2, Pp 19-28 (2016)
The phytoplankton limitation conditions in a few Bulgarian and Hungarian wetlands and in two more sampling sites, one for each Danube stretch, were investigated by means of trophic state index of Carlson (1977) for phytoplankton chlorophyll-a (CHL),
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::736f7abe1f3b9d0ad075c89d292bb114
https://doi.org/10.1515/trser-2015-0084
https://doi.org/10.1515/trser-2015-0084
Publikováno v:
Transylvanian Review of Systematical and Ecological Research, Vol 18, Iss 1, Pp 13-22 (2016)
The trophic status and relationships between Secchi depth transparency (SD) chlorophyll-a (CHL) and total phosphorus (TP) concentrations from nine non-infested and five infested areas with invasive alien species, Dreissena ssp. reservoirs, situated o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f9b96a692af8598d8fcd7ed1b8440ad
https://doi.org/10.1515/trser-2015-0076
https://doi.org/10.1515/trser-2015-0076
Autor:
Nikolett Tarjanyi, Hristina Kalcheva, Mária Dinka, Árpád Berczik, Roumen Kalchev, Edit Ágoston-Szabó, Anita Kiss
Publikováno v:
Transylvanian Review of Systematical and Ecological Research, Vol 18, Iss 1, Pp 1-12 (2016)
Seasonal and spatial distribution of bacterioplankton from two Hungarian oxbow lake type wetlands, Mocskos-Danube and Riha, was studied. They were both covered by macrophytes and they had different hydrological connectivity to the Danube. The six sam
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c31b1cafec841939f42c408a4e1389f8
https://doaj.org/article/547cd306b81f433caa7ba32b1a50947e
https://doaj.org/article/547cd306b81f433caa7ba32b1a50947e
Autor:
Teodora Trichkova, Mihaela Beshkova, Hristina Kalcheva, Marieta Stanchkova, D. Kozuharov, Roumen Kalchev, Stefan Stoichev
Publikováno v:
Transylvanian Review of Systematical and Ecological Research, Vol 18, Iss 1, Pp 23-34 (2016)
Spatial, seasonal, and annual bacterioplankton dynamics in recently infested by the species Dreissena polymorpha Ogosta Reservoir were studied for the first time during three year period. Bacterioplankton total number was higher in spring in ecotone
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca7f4a7b0c2dbbdf4e21de8b931d6130
https://doaj.org/article/7bee6be74c5e4f56b7bfd6e47323e483
https://doaj.org/article/7bee6be74c5e4f56b7bfd6e47323e483
Publikováno v:
Agricultural Science and Technology, Vol 8, Iss 1, Pp 62-69 (2016)
Three years studies (2004 – 2006) on the main biotic parameters (chlorophyll-a, phytoplankton biomass, zooplankton biomass and bacterioplankton biomass) in carp fish ponds were carried out. The aim of the study was to investigate the biotic factors
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f72faa2aa81445629d707fcc34a19a72
http://agriscitech.eu/wp-content/uploads/2016/03/011.pdf
http://agriscitech.eu/wp-content/uploads/2016/03/011.pdf
Publikováno v:
River Systems. 18:25-43
Data of nutrients, seston and phytoplankton abundance compiled from literature and routine monitoring and covering the last 55 years were analysed for long-term and seasonal trends. Most of the data originated from the stretch between 376 and 554 riv
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cbdf4d6268b72d7156e68d0b65c8c5ed
https://doi.org/10.1127/lr/18/2008/25
https://doi.org/10.1127/lr/18/2008/25
Publikováno v:
Aquaculture International. 15:181-190
The effect of cattle organic fertilizer on plankton primary production and related variables was tested in six Bulgarian fish ponds situated close to the town of Plovdiv in Bulgaria. At the beginning of the experiment (16th of May 2004, about 10 days
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::389b8a6b36595e15e631dea006262e1a
https://doi.org/10.1007/s10499-007-9086-1
https://doi.org/10.1007/s10499-007-9086-1