<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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, <italic>Dreissena</italic> ssp. reservoirs, situated on the Bulgarian Danube River tributaries were studied. The trophic status index (TSI) values after <xref ref-type="bibr" rid="j_trser-2015-0076_ref_004_w2aab2b8b5b1b7b1ab1ab4Aa">Carlson (1977)</xref>, and showed statistically significant differences for all three variables between infested and non-infested reservoirs. The three linear regression equations between SD × CHL, CHL × TP and SD × TP were statistically significant for the group of non-infested reservoirs, while in the infested reservoirs only the SDxCHL regression was statistically significant for P &lt; 0.05. Our results showed that the <italic>Dreissena</italic> invasion destroyed the linear relationship between CHL × TP and SD × TP and seems to affects the accurate application of Carlson TSI.</p></abstract>

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 on the Bulgarian Danube River tributaries were studied. The trophic status index (TSI) values after Carlson (1977), and showed statistically significant differences for all three variables between infested and non-infested reservoirs. The three linear regression equations between SD × CHL, CHL × TP and SD × TP were statistically significant for the group of non-infested reservoirs, while in the infested reservoirs only the SDxCHL regression was statistically significant for P < 0.05. Our results showed that the Dreissena invasion destroyed the linear relationship between CHL × TP and SD × TP and seems to affects the accurate application of Carlson TSI.

Trophic Relationships and Status of Reservoirs with and without Occurrence of <italic>Dreissena</italic> ssp. (Mollusca, Bivalvia) Built on Bulgarian Danube River Tributaries

Bulgarian Academy of Science, Institute of Biodiversity and Ecosystem Research, Tsar Osvoboditel Boulevard 1, Sofia, BG-1000,

Transylvanian Review of Systematical and Ecological Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Trophic Relationships and Status of Reservoirs with and without Occurrence of  ssp. (Mollusca, Bivalvia) Built on Bulgarian Danube River Tributaries

The trophic status and relationships between Secchi depth transparency (SD) chlorophyll-a (CHL) and total phosphorus (TP) concentrations from nine non-infested...

Trophic Relationships and Status of Reservoirs with and without Occurrence of Dreissena ssp. (Mollusca, Bivalvia) Built on Bulgarian Danube River Tributaries

Published Online: Dec 30, 2016

Page range: 13 - 22

DOI: https://doi.org/10.1515/trser-2015-0076

Keywords
aquatic cormophytes, paludal cormophytes, chorology

© 2016 Roumen Kalchev et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Trophic Relationships and Status of Reservoirs with and without Occurrence of Dreissena ssp. (Mollusca, Bivalvia) Built on Bulgarian Danube River Tributaries

Published Online: Dec 30, 2016

Page range: 13 - 22

DOI: https://doi.org/10.1515/trser-2015-0076

Keywordsaquatic cormophytes, paludal cormophytes, chorology

© 2016 Roumen Kalchev et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
aquatic cormophytes, paludal cormophytes, chorology