Dynamics of Dreissena spp. veliger larvae in some Bulgarian reservoirs

Figures & data

Figure 1. Map with the studied reservoirs in Bulgaria.

Table 1. Samples description according the season, place and number.

Reservoir	River	Season/month						Stations	Samples
Ogosta	Ogosta		March	April		July	September	5	81
Rabisha	Vidbol-Archar			April			September	3	8
Poletkovtsi	Voynishka			April			September	3	4
Kovachica	Cibrica						September	1	1
Zhrebchevo	Tunja	February			May	June July	October	4	80
Ovcharica	Marica			April	May	July	August	3	13

Figure 2. Seasonal dynamics of the veliger larvae N (ind m⁻³) in relation to water temperature in Zhrebchevo Reservoir (a) and Ogosta Reservoir (b).

Figure 3. Maximum values of the veliger larvae density (ind m⁻³) in Zhrebchevo Reservoir in 2009–2011 (a) and in Ogosta Reservoir in September 2006, 2009 and 2010 (b).

Figure 4. Vertical distribution of the abundance of the veliger larvae at the sites with the highest depths in Zhrebchevo Reservoir (a) and Ogosta Reservoir (b).

Figure 5. Seasonal dynamics of the veliger larvae in the Rabisha Reservoir in 2009–2010; (a) maximum values of the veliger larvae density (ind m⁻³) in the Rabisha Reservoir in 2009–2010 compared to previous studies from 2006 after Kozuharov et al.[11] (b).

Figure 6. Dynamics of the veliger larvae of D. polymorpha in the Rabisha Reservoir at stations 1, 2 and 3 in 2009–2010, compared to previous studies from 2006 after Kozuharov et al.[11].

Figure 7. Dynamics of the veliger larvae in the Poletkovtsi Reservoir at station 1, 2 and 3 in September 2009 compared to previous studies from 2006 after Kozuharov et al.[11].

Figure 8. Seasonal dynamics of the veliger larvae N (ind m⁻³) in the Ovcharitsa Reservoir in 2013.

Kozuharov D, Trichkova T, Stanachkova M, et al. Comparative analysis of zooplankton composition in reservoirs of North-West Bulgaria: relation to water physicochemical parameters and Dreissena infestation. Acta Zool Bulg. 2013;65(3):359–370.

 Web of Science ®Google Scholar