From June to August 2016, a field survey of the distribution of aquatic macrophytes was performed along Bečej-Bogojevo channel, survey mark 0+250-1+600km. In this research taxonomy and vegetation of macrophytes are given. Dominant aquatic macrophytes were identified as well as their morphological and biological characteristics. Based on results at 10 locations of the Bečej-Bogojevo channel 16 weed species were determined. The main aquatic macrophytes occurring in study area are Ceratophyllum demersum L., Trapa natans L., and Salvinia natans L.All. Mechanical control measures were effective on all identified species except Salvinia natans (L). All. which is restores from fragments, while from biological measures in our country only the introduction of the grass carp species is applied (Ctenopharyngodon idella Valenciennes in Cuvier & Valenciennes, 1844)

Begović, Radovan

Dudić, Milica

Džigurski, Marko

Meseldžija, Maja

Meseldžija Maja

Dudić Milica

Begović Radovan

Džigurski Marko

University of Szeged

 25th International Symposium on Analytical and Environmental Problems 432 ESTIMATE OF CONTROL MEASURES FOR AQUATIC MACROPHYTES IN BEČEJ-BOGOJEVO CHANNEL (SERBIA)  Maja Meseldžija1, Milica Dudić1, Radovan Begović2, Marko Džigurski1  1University of Novi Sad, Faculty of Agriculture, Trg Dositeja Obradovića 8, Novi Sad, Serbia  2Chemical Agrosava, Palmira Toljatija 5/IV, Novi Beograd, Serbia e-mail: maja@polj.uns.ac.rs  Abstract From June to August 2016, a field survey of the distribution of aquatic macrophytes was performed along Bečej-Bogojevo channel, survey mark 0+250-1+600km. In this research taxonomy and vegetation of macrophytes are given. Dominant aquatic macrophytes were identified as well as their morphological and biological characteristics. Based on results at 10 locations of the Bečej-Bogojevo channel 16 weed species were determined. The main aquatic macrophytes occurring in study area are Ceratophyllum demersum L., Trapa natans L., and Salvinia natans L.All. Mechanical control measures were effective on all identified species except Salvinia natans (L). All. which is restores from fragments, while from biological measures in our country only the introduction of the grass carp species is applied (Ctenopharyngodon idella Valenciennes in Cuvier & Valenciennes, 1844).   Introduction Aquatic macrophyte species are important parts of natural aquatic systems because they produce oxygen and perform a water-purification function by binding heavy metals and removing nutrient loads [1]. Macrophytes serve as habitats for a wide diversity of organisms, they promote sediment deposition, increase water clarity and quality and have an influence on fish productivity [2]. Problems with aquatic plants have increased in the last two centuries, so they disturb the flow of water in irrigation canals and drainage channels. Deep-rooted submerged weeds cause a reduction in oxygen levels and present gas exchange with water resulting in unfavorable fish production, and provide ideal habitat for the mosquito development, and serve as vectors for disease [3]. The most widespread macrophytes in the Danube-Tisa-Danube channel are Ceratophyllum demersum L., Trapa natans L., Typha latifolia L., Salvinia natans L. All., Hydrocharis morsus ranae L., Potamogeton lucens L., Lemna minor L., Nymphea alba L. [4]. The Danube-Tisa-Danube (DTD) hydro-system is a multivalent water system connecting waters of Bačka and Banat regions in Serbia. The Bečej-Bogojevo canal is 90km long and it starts from the Tisa river at Bečej lock. The canal weed control is a complex task demanding knowledge of aquatic plants. Mechanical control is expensive and requires access to waterways, while chemical control is easier, quick and usually cheaper when compared to mechanical methods [5], but herbicides are often toxic that the water cannot be used often for fish culture or human consumption. The species which has been most widely used in biological control is the grass carp, Ctenopharyngodon idella. The aim of this paper was to review the most frequent aquatic weeds of the canal DTD and to provide recommendations for their mechanical, chemical and biological control.  Experimental In this paper, during the vegetation period in 2016, the presence of aquatic weed species was examined on the Bečej-Bogojevo channel (survey mark 0+250-1+600km) in Serbia. Collected plant material was identified by ,,Flora of SR Serbia I-IX,, [6], ,,Flora of Serbia X,, [7], ,,Flora of Serbia I,, [8], ,,Flora Europeae I-V,, [9] i Iconographie der Flora des Sudostlichen Mitteleuropa,, [10]. The standard phytocenological methods of the Swiss-French school were  25th International Symposium on Analytical and Environmental Problems 433 used to record vegetation [11]. Biological and morphological properties of aquatic macrophytes are also shown. The assessment of measures has been compared with the literature data, where both the advantages and disadvantages for all measures individually by species suppressed are given.  Results and discussion Phytocenological analysis was performed on the Bečej-Bogojevo channel at 10 localities by Braun-Blanquet method. The results and available weeds in the selected area are given in Table 1-3 with their scientific names. During the floristic research different types of species were found in the study area on the Bečej-Bogojevo channel. In that area, 16 weed species were identified.  Analyzing higher taxonomic categories, of the 16 constant species, 4 species belong to the class Magnoliopsida (Ceratophyllum demersum L., Trapa natans L. (agg.), Rumex lapatifolium L., Rumex hydrolaphatum (Huds), 11 species to the class Liliopsida (Typha latifolia L., Hydrocharis morsus-ranae L., Typha angustifolia L., Phragmites communis L. Trin., Lemna minor L., Potamogeton pectinatus L., Glyceria maxima (Hartm) Holm, Potamogeton crispus L., Butomus umbellatus L., Vallisneria spiralis L., Najas marina L.) and 1 species belong to the classes Polypodiopsida (Salvinia natans L. All.). The flora is divided into 11 families, of which the representatives of the families Poaceae, Polygonaceae, Hydrochariaceae, Typhaceae, Potamogetonaceae are presented with 2 representatives for each family, while the families Lemnaceae, Najadaceae, Ceratophylaceae, Salviniaceae, Trapaceae, Butomaceae are presented with only one.  Table 1. Phytocoenological recordings, June 2016 Surface size (m2) 25 25 25 25 25 25 25 25 25 25 The level of presence Cover value General coverage 70 80 95 70 100 95 95 100 100 100 Number of plant species 3 4 9 7 6 3 6 5 3 5  Plant species 1 2 3 4 5 6 7 8 9 10 Ceratophyllum demersum L. 1.1 2.2 3.3 4.4 3.3 3.3 2.2 1.1 3.3 1.1 V 2625 Trapa natans L.(agg.) - 1.1 - 2.2 3.3 - - +.1 +.1 3.3 IV 985 Typha latifolia L. - - 2.2 - - - - 3.3 - 4.4 II 1175 Salvinia natans L. Alli. - - - - - - - - - - - - Hydrocharis morsus-ranae L. - - - - - - - - - - - - Typha angustifolia L. - - - - 3.3 - - - 3.3 - I 750 Phragmites communis Trin. - 4.4 - - 2.2 - - 4.4 - - II 1425 Lemna minor L. - - - - - - - - - - - - Rumex lapatifolium L. - - 1.1 1.1 - - 1.1 - - - II 150 Potamogeton pectinatus L. - - +.1 +.1 - - - +.1 - +.1 II 20 Glyceria maxime (Hartm) Holm 1.1 - 2.2 - 1.1 - 1.1 - - 1.1 III 375  25th International Symposium on Analytical and Environmental Problems 434 Potamogeton crispus L. - - +.1 +.1 +.1 - - - - - I 15 Butomus umbellatus L. - - +.1 +.1 - +.1 +.1 - - - II 20 Vallisneria spiralis L. 2.2 +.1 +.1 - - - +.1 - - - II 190 Rumex hydrolaphatum (Huds) - - +.1 +.1 - +.1 +.1 - - - II 20 Najas marina L. - - - - - - - - - - - -  During June 2016, at the tested localities, dominant species were Ceratophyllum demersum L., Phragmites communis Trin., and Typha latifolia L., of which C. demersum had the highest cover value, with the level of presence V. Ceratophyllum demersum is a submerged, perennial plant with no roots, attached to the lake bottom by modified leaves. Mechanical measures had good effects in some more temperate areas. Engel (1990) [12] states that the best results were obtained if suppression was carried out during July. In Serbia, herbicides diquat and 2,4-D have been registered for this species. It is successfully suppressed using the fish Ctenopharyngodon idella, as a biological control measure.  Table 2. Phytocoenological recordings, July 2016 Surface size (m2) 25 25 25 25 25 25 25 25 25 25 The level of presence Cover value General coverage 70 80 95 70 100 95 95 100 100 100 Number of plant species 5 8 12 9 5 3 8 4 4 6   Plant species 1 2 3 4 5 6 7 8 9 10 Ceratophyllum demersum L. 1.1 2.2 3.3 4.4 3.3 2.2 2.2 1.1 3.3 1.1 V 2425 Trapa natans L.(agg.) 1.1 1.1 2.2 2.2 2.2 - 1.1 - 2.2 2.2 IV 1025 Typha latifolia L. - - 2.2 - - - - 3.3 - 4.4 I 1175 Salvinia natans L. Alli. - - - - - - - - - - - - Hydrocharis morsus-ranae L. - 2.2 2.2 +.1 - - +.1 - 1.1 2.2 III 585 Typha angustifolia L. - - - - 3.3 - - - 3.3 - I 750 Phragmites communis L. Trin. - 4.4 - - 2.2 - - 4.4 - - II 1425 Lemna minor L. 1.1 1.1 2.2 2.2 - - 1.1 - - 1.1 III 550 Rumex lapatifolium L. - - 1.1 1.1 - - 1.1 - - - II 150 Potamogeton pectinatus L. - - 1.1 1.1 - - - +.1 - +.1 II 110 Glyceria maxime (Hartm) Holm +.1 - +.1 - +.1 - +.1 - - - II 20 Potamogeton crispus L. - +.1 +.1 +.1 - - - - - - I 15 Butomus umbellatus L. - +.1 +.1 - - - - - - - I 10  25th International Symposium on Analytical and Environmental Problems 435 Vallisneria spiralis L. +.1 +.1 +.1 +.1 - - +.1 - - - III 25 Rumex hydrolaphatum (Huds) - - +.1 +.1 - +.1 +.1 - - - II 20 Najas marina L. - - - - - +.1 - - - - I 5 In submerged vegetation during the July, the dominant role had the species Ceratophyllum demersum L., whose level of presence was V. When it comes to flotant plants, Trapa natans L. was most dominant, with a cover value of 1025 and the level of presence IV. In addition to these two species, Phragmites communis L. Trin and Typha latifolia were also dominant. Trapa natans L. is a floating herb, that colonizes areas of freshwater lakes and ponds where it forms floating vegetation, causing problems for boaters and swimmers. Early detection of introductions and rapid control response are key to preventing high impact infestations. Herbicides that are effective on T. natans are glyphosate, triclopyr, and 2,4-D. The most promising biocontrol species appears to be the leaf beetle Galerucella birmanica.   Table 3. Phytocoenological recordings, August 2016 Surface size (m2) 25 25 25 25 25 25 25 25 25 25 The level of presence Cover value General coverage 70 95 95 80 100 90 95 100 100 100 Number of plant species 5 7 9 5 6 5 8 5 5 6 Plant species 1 2 3 4 5 6 7 8 9 10 Ceratophyllum demersum L. 2.2 2.2 2.2 3.3 2.2 2.2 2.2 1.1 2.2 1.1 V 1700 Trapa natans L.(agg.) +.1 +.1 1.1 1.1 2.2 - 1.1 - 1.1 +.1 IV 390 Typha latifolia L. - - 4.4 - - - - 3.3 - 4.4 II 1625 Salvinia natans L. Alli. 1.1 2.2 3.3 2.2 2.2 1.1 - 3.3 3.3 3.3 IV 1950 Hydrocharis morsus-ranae L. - 3.3 2.2 2.2 +.1 1.1 +.1 - 1.1 - IV 835 Typha angustifolia L. - - - - - - - - 3.3 - I 375 Phragmites communis L. Trin. - 3.3 - - 3.3 - - 3.3 - - II 1125 Lemna minor L. - - +.1 - - - 1.1 - - +.1 II 60 Rumex lapatifolium L. - - - - - - 1.1 - - - I 50 Potamogeton pectinatus L. - - +.1 1.1 +.1 - - +.1 - +.1 III 70 Glyceria maxime (Hartm) Holm +.1 - +.1 - - - +.1 - - - II 15 Potamogeton crispus L. - +.1 +.1 - - - - - - - I 10 Butomus umbellatus L. - +.1 - - -  - - - - I 5 Vallisneria spiralis L. 3.3 - - - - +.1 +.1 - - - I 375 Rumex hydrolaphatum - - - - - - +.1 - - - I 5  25th International Symposium on Analytical and Environmental Problems 436 (Huds) Najas marina L. - - - - - +.1 - - - - I 5 The dominant aquatic macrophytes in August 2016, were Salvinia natens, with the level of presence IV, then Ceratophyllum demersum L., and Typha latifolia L. Many endangered plant species are found in aquatic ecosystems. Some of these species are Najans marina L., Hidrocharis morsus-ranae L., Ceratophyllum demersum L., Trapa natans L., Butomus umbellatus L., Vallisneria spiralis L., which deserves special attention because their protection contributes to the conservation of ecosystem diversity.  Conclusion Based on the number and coverage, 16 aquatic weeds species were identified at 10 localities of the Bečej-Bogojevo canal in the period June-August 2016. The most common are the representatives of the family Poaceae, Polygonaceae, Hydrochariaceae, Typhaceae, Potamogetonaceae. The predominant aquatic macrophytes at the investigated localities in June was Ceratophyllum demersum L., in July Trapa natans L. and in August month Salvinia natans L.All. During the vegetation period, in June and July 2016, it is recommended that mechanical suppression need to be repeated based on the dominant aquatic flora. In the case of the introduction of grass carp into the Bečej-Bogojevo canal, as a form of biological control, the application of mechanical suppression would be reduced.  References [1] L. Moeller, A. Bauer, H. Wedwitschka, W. Stinner, A. Zehnsdorf, Crop Characteristics of Aquatic Macrophytes for Use as a Substrate in Anaerobic Digestion Plants—A Study from Germany. Energies, (2018), 11, p. 3016.  [2] H. Yu, W. Qi, C. Liu, L. Yang, L. Wang, T. Lv, J. Peng, Different Stages of Aquatic Vegetation Succession Driven by Environmental Disturbance in the Last 38 Years. Water, 11(7), (2019), p.1412.  [3] M. Salwa Abou El Ellaand, A. Tarek El Samman. Review: Egyptian Experience in Controlling Aquatic Weeds. J Am Sci, (2016), pp. 104-115. [4] B. Konstantinović, M. Meseldžija, S. Maletin, Mogućnost primene herbicida i biljojedih riba u uklanjanju korovske vegetacije iz kanalske mreže. U: Održive melioracije, Belić, S. (ed.), Univerzitet u Novom Sadu Poljoprivredni, Novi Sad, (2007). [5] S. Datta, Aquatic Weeds and Their Management for Fisheries, Aquatic Weeds and Their Management for Fisheries, (2009), pp. 1-22. [6] M. Josifović, (ed.). Flora SR Serbia, I-IX, SANU, Belgrade, (1970-1977). [7] Sarić, M. (ed.). Flora of Serbia X, SANU, Belgrade,  (1986). [8] Sarić, M. (ed.). Flora of Serbia 1. SANU, Belgrade, (1992). [9] G. Tutin, V.H. Heywood, N.A. Burges, D.H. Valentine, S.M. Walters, D.A. Webb, (ed.) Flora Europaea I, Cambridge University press, Cambridge, England, (1964). [10] S. Jávorka, V. Csapody, Icanographie der Flora des Südostlichen Mitteleuropa. Akademiai Kiado, Budapest, (1975). [11] J. Braun-Blanquet, Pflanzesociologie, Grundzuge der Vegetations Kunde. 3rd ed. Springer Verlag, Wien-New York, (1964). [12] S. Engel, Ecological impacts of harvesting macrophytes in Halverson lake, Wisconsin. Journal of Aquatic Plant Management, (1990), pp. 41-45.   

Estimate of control measures for aquatic macrophytes in Bečej-Bogojevo channel - Serbia

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Estimate of control measures for aquatic macrophytes in Bečej-Bogojevo channel - Serbia

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