Archived project

studies on the behavior of poikilotherm vertebrates from the Danube Delta area

Goal: One of the goals is to assess the eventual changes in the behavior of amphibians and fishes in the presence of alien (possibly/probably invasive, too) fish species.

Date: 28 March 2016 - 31 December 2017

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Project log

Zsolt Török
added an update
- complete title of the project: Studiul modificărilor induse de speciile invazive în comportamentul şi dinamica populatională a vertebratelor native de interes conservativ din Rezervaţia Biosferei Delta Dunării
- contract No 47N/28.03.2016;
- code of project PN 16 28 01 03;
- title of program: Programul Nucleu ”Delta Dunării” (code of program: PN 16 28)
- financial support for the project and beneficiary of the results:
  • in 2016: Romanian Ministry of National Education and Scientific Research (Ministerul Educaţiei Naţionale şi Cercetării Ştiinţifice) - National Authority of Scientific Research (Autoritatea Naţională pentru Cercetare Ştiinţifică);
  • in 2017: Romanian Ministry of Research and Innovation (Ministerul Cercetării și Inovării) - National Authority for Scientific Research and Innovation (Autoritatea Naţională pentru Cercetare Ştiinţifică și Inovare)
 
Zsolt Török
added a research item
The abstract is about the status (distribution) of Perccottus glenii after a decade of its first record in the Danube Delta Biosphere reserve (Romania)
Zsolt Török
added 2 research items
Diploma for Third place awarded to the poster entitled "Occurrence of Perccottus glenii in the Danube Delta Biosphere Reserve (Romania) after a decade of its presence in the area" (authors: Török Z. and Török L.), presented on the XXVIth International Symposium "Deltas and Wetlands", held at Tulcea (Romania) in 16 - 20 May 2018 period.
In 15 V. 2017 - 17 X. 2017 period there were performed 145 samplings in the Danube Delta Biosphere Reserve (DDBR) area, out of which: 125 samplings in the DDBR, 6 samplings in the close neighbourhood of DDBR, 9 samplings in the Lower Danube valley, but outside of the DDBR and 5 samplings in the catchment area of the Razim-Sinoe lagoonary region, but outside of the DDBR. Perccottus glenii was captured 26 times, in a total number of 25 sites, all the sites being located inside the DDBR, meaning that the species was recorded in 20.8% of the cases. Taking into account the results of the investigations performed with a simple and unselective tool (a mesh with handle), we consider that P. glenii has passed the stage of accommodation to the conditions of the proper Delta and is in a process of aggressive occupation of various freshwater habitats. In 2017 the species was recorded for the first time in Dranov region. Consequently, in the next few years P. glenii will probably occur in the lagonnary region, too. The investigations were performed in the frame of the project entitled ”Study on the changes induced by invasive species into the behaviour and the populational dinamics of native vertebrates of conservative interest from the Danube Delta Biosphere Reserve” (”Studiul modificărilor induse de speciile invazive în comportamentul şi dinamica populatională a vertebratelor native de interes conservativ din Rezervaţia Biosferei Delta Dunării” - project code: PN 16 28 01 03 - Danube Delta Core Program).
Zsolt Török
added an update
So, this is the map with the distribution of sites where Perccottus glenii was recorded in the Danube Delta Biosphere Reserve, in about a little bit more than a decade (2007 being the year when the species was recorded for the first time in this area). It is based on published data and on the results of the intensive investigations carried out in 2016 - 2017. I did not take into account data from articles in case of which the site of capture/record was too general (e.g. a whole region etc.).
 
Zsolt Török
added a research item
Distribution of the sites from the Danube Delta Biosphere Reserve (Romania), where the Amur Sleeper (Perccottus glenii) was recorded in the 2007 - 2017 period.
Zsolt Török
added an update
Out of the 145 occasions of samplings, Perccottus glenii was captured in 26 occasions, respectively, in a total number of 25 sites (in only one site the species was recorded two times). Two other details are worthwhile to be mentioned:
1. all the sites being located inside the DDBR;
2. in 2017 the species was recorded for the first time in the area between the proper Danube Delta and the Razim-Sinoe lagoonary area (in a channel only few km away from the Northern shore of Lake Razim). Consequently, it is expected that in the forthcoming future the species will invade some part of the lagoonary region, too (at least the parts dominated by freshwater, not by brackish waters...).
 
Zsolt Török
added a research item
Distribution of sites from the Danube Delta Biosphere Reserve (Romania) where Perccottus glenii was recorded in 2017.
Zsolt Török
added an update
In 15 V. 2017 - 17 X. 2017 period there were performed samplings for Perccottus glenii in 145 occasions, as follows: 125 samplings in the DDBR (white spots in the figure), 6 samplings in the close neighbourhood of DDBR (yellow spots in the figure), 9 samplings in the Lower Danube valley (upstream and outside of the DDBR) (green spots in the figure) and 5 samplings in the catchment area (outside of the DDBR) of the Razim-Sinoe lagoonary region (blue spots in the figure).
 
Zsolt Török
added 7 research items
sites of the Danube Delta Biosphere Reserve (Romania) area checked-out for Amur Sleeper (Perccottus glenii) during 2017
experimental group of Bufo viridis tadpoles, introduced into compartments AS_3.3C and AS_3.3D, on 23 April 2018.
experimental group of Bufo viridis tadpoles, introduced into compartments AS_3.2C and AS_3.2D, on 23 April 2018.
Zsolt Török
added an update
In 2018 the experiments have been performed in enclosures having a different structure than the ones used in the previous years. These new sets include the same components. Practically, aquariums of 128 liters (80cm x 40cm x 40cm) are divided by a plain glass (indicated by 1 in the figure) into two parts (of about 64L), each of them having two compartments, separated by a plastic wall (indicated by 2 in the figure) with holes that allow the movement (from one compartment into the other one) of the fishes or amphibians with small body-size.
Each compartment contains three types of artificial "plants":
- tall ones, with some living aquatic mussel in its core area - indicated with p1 in the figure;
- medium sized ones - indicated with p2 in the figure;
- short ones - indicated with p3 in the figure.
The artificial "plants" are mounted on (fixed to) a plastic support (indicated by s in the figure), its tube-shaped elements serving as shelter for the small-sized specimens introduced into the enclosures. The support is placed into the enclosure such way that the longitudinal axes of the tubes are perpendicular to the front glass of the aquarium (allowing to check out them - for the presence or absence of the specimens of the experimental lots). Also, the tubes are not closed at their rear, in order to allow to the observer to check-out the bottom areas located behind the plastic support.
Supplementary oxygen are provided by cylindrical air stones (indicated by the white arrows in the figure), that are also ensuring the movement (even if it is a slow one) of the water in only (or, mostly) one of the two compartment.
 
Zsolt Török
added a research item
Structure (and elements) of and experimental set, with enclosures, used for behavioral studies on aquatic vertebrates.
Zsolt Török
added 3 research items
Channel Enisala is between Lake Babadag and Lake Razim (Danube Delta Biosphere Reserve).
Image of the outlet (to Babina branch) of the channel from the Eastern part of Babina island (Danube Delta Biosphere Reserve, Romania).
Marshland (dominated by reed-mace, Typha angustifolia) between Bestepe Hills and Sfantu Gheorghe branch (Danube Delta Biosphere Reserve).
Zsolt Török
added an update
The shore of Tătaru channel (branch), at Chilia Veche locality (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Picture of Tătaru channel, at Chilia Veche locality, near to its intersection with Chilia branch (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The right shore of Chilia branch, downstream Chilia Veche locality (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Image of the right shore of Chilia branch, downstream of Chilia Veche locality (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The right shore of Chilia branch, at Periprava (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Image of the right shore of Chilia branch at Periprava village (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of the outlet of the channel from the Eastern part of Babina island (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added an update
The shore of the channel from the Eastern part of Babina island (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Image of the channel from the Eastern part of Babina island (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of Tătarului branch (secondary branch of Chilia branch) at Tatanir locality (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Image of the shore of Tătarului branch at Tatanir locality (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of Chilia branch at Pardina locality (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Image of the shore of Chilia branch at Pardina locality (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of the channel between Chilia branch and Pardina gate (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Image of the channel between Chilia branch and Pardina gate (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of the Northern end of Mila 36 channel (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Northern end of Mila 36 channel, at Chilia branch (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The right shore of Chilia branch, upstream of Plauru locality (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
The right shore of Chilia branch, upstream of Plauru locality (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The right shore of Chilia branch, at Ceatalchioi locality (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Image of the right shore of Danube (Chilia branch), at Ceatalchioi locality (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The right shore of Chilia branch, upstream of Salceni locality (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Right shore of Danube (Chilia branch), upstream of Sălceni locality (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The right shore of Chilia branch, at Pătlăgeanca village (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Right shore of Danube (Chilia branch), at Pătlăgeanca village (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The left shore of Tulcea branch, downstream of Pătlăgeanca village (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added a research item
Image of the left shore of Danube (Tulcea branch), downstream of Patlageanca locality (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The left shore of Tulcea branch, upstream of Tudor Vladimirescu village (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 28 VI. 2017.
 
Zsolt Török
added 3 research items
Left shore of Danube (Tulcea branch), upstream of Tudor Vladimirescu village (Danube Delta Biosphere Reserve, Romania).
Map with the distribution of sites from the Danube Delta Biosphere Reserve (and its close neighborhood) investigated in 21 June 2017.
Channel along the Western border of Grind Chituc marine levee, in the area of Lake Edighiolu Mic (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The sites, investigated (for aquatic vertebrates) in 27 VI. 2017, are in the Razim-Sinoe lagoonary area (part of the Danube Delta Biosphere Reserve, Romania).
 
Zsolt Török
added a research item
Distribution of sites from the Danube Delta Biosphere Reserve, checked out for aquatic vertebrates in 27 VI. 2017.
Zsolt Török
added an update
The shore of Perisor channel, at its South-Eastern end (close to the Black Sea) (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 27 VI. 2017.
 
Zsolt Török
added a research item
South-Eastern end of Perișor channel (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of the Black Sea, at the former Perișor fishery (Danube Delta Biosphere Reserve, Romania), is obviously eroded by the stream from the North-Western part of the Black Sea.
In 2014, the shore-line was at about 20 (or even more) meters from the wall of the fishery-building.
 
Zsolt Török
added a research item
Shore of Black Sea at the former Perisor fishery (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of Dranov channel, near to its Western end (from Lake Razim...) (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 27 VI. 2017.
 
Zsolt Török
added a research item
Dranov channel - part close to the Western end (from Lake Razim) (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of the Western end (from Lake Razim...) of Periteașca channel (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 27 VI. 2017.
 
Zsolt Török
added a research item
Periteașca channel - end from Lake Razim (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The South_eastern shore of Lake Leahova Mica (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 27 VI. 2017.
 
Zsolt Török
added a research item
Shore of the South-Eastern part of Lake Leahova Mică (Danube Delta Biosphere Reserve).
Zsolt Török
added an update
The channel from Gura Portitei tourist resort area (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 27 VI. 2017.
 
Zsolt Török
added a research item
Shore of the Gura Portitei channel, at the tourist resort (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The saline, temporary ponds located nearby Gura Portitei tourist resort (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 27 VI. 2017.
P.S. At least those that had water at the end of June...
 
Zsolt Török
added a research item
Temporary ponds in Gura Portitei area (Danube Delta Biosphere Reserve, Romania), at the end of June 2017.
Zsolt Török
added an update
The shore of the Western part of Dunavăț channel - relatively near to Lake Razim (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 27 VI. 2017.
 
Zsolt Török
added a research item
Shore of the Western part of Dunavăț channel (near to Lake Razim) (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of Vanghele channel, near to the intersection with Dunavăț channel (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 27 VI. 2017.
 
Zsolt Török
added a research item
Vanghele channel, near to the intersection with Dunavăț channel (Danube Delta Biosphere Reserve, Romania)
Zsolt Török
added an update
The shore of Dunavat channel, at the intersection with Lipovenilor channel (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 27 VI. 2017.
 
Zsolt Török
added a research item
Dunavăț channel at the intersection with Lipovenilor channel (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The sites, investigated (for aquatic vertebrates) in 22 VI. 2017, are in the Danube Delta Biosphere Reserve (Romania) - practically along the continental limit of the protected area.
 
Zsolt Török
added a research item
Sites of the Danube Delta Biosphere Reserve, investigated in 22 June 2017.
Zsolt Török
added an update
The shore of the channel from the Southern part of Zebil pond ("Lake Tauc") (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 22 VI. 2017.
 
Zsolt Török
added a research item
Channel along the Southern shore of Zebil pond (Lake Tauc) - Danube Delta Biosphere Reserve (Romania).
Zsolt Török
added an update
The shore of the South-Western part of Lake Murighiol (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 22 VI. 2017.
 
Zsolt Török
added a research item
Shouth-Western shore of Lake Murighiol (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The site with the dam built for sport-fishermen, from the Western shore of Lake Murighiol (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 22 VI. 2017.
 
Zsolt Török
added a research item
Shore of the Western part of Lake Murighiol (Danube Delta Biosphere Reserve, Romania), with dam built as facility for sport-fishing.
Zsolt Török
added an update
The site with facilities for sport-fishing, from the Western shore of Lake Murighiol (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 22 VI. 2017.
 
Zsolt Török
added 2 research items
Western shore of Lake Murighiol, with wood-platform (facility for sport-fishing) - Danube Delta Biosphere Reserve (Romania).
Western shore of Lake Murighiol - spot with wood-platform for sport-fishing (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The pond from Ghiolul ("shallow lake") Pietrei area (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 22 VI. 2017 (this time with negative results...).
 
Zsolt Török
added a research item
Pond in Ghiolul Pietrei area (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The reed-dominated marshalnd nearby Nufaru locality (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 22 VI. 2017 (this time with positive results...).
 
Zsolt Török
added a research item
Reed-dominated marsh nearby Nufăru locality (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The channel between the Danube river and Lake Zaghen (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 22 VI. 2017.
 
Zsolt Török
added a research item
Channel between the Danube river and Lake Zaghen (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The sites, investigated (for aquatic vertebrates) in 21 VI. 2017, are located in the Razim-Sinoe lagoonary area (most of them inside the Danube Delta Biosphere Reserve, Romania, one in the close neighborhood of the above-mentioned protected area).
 
Zsolt Török
added an update
The shore of the channel along Grindul Chituc marine levee, in the area of Lake Edighiolu Mic (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 21 VI. 2017.
 
Zsolt Török
added a research item
Channel along the Western border of Grindul Chituc marine levee, in the area of Lake Edighiolu Mic (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shore of the channel between Lake Sinoe and the Black Sea (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 21 VI. 2017.
 
Zsolt Török
added a research item
Channel between Lake Sinoe and the Black Sea (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The brackish pond from the Southern part of Chituc marine levee (Danube Delta Biosphere Reserve, Romania), was checked out (for the second time in 2017) for Perccottus glenii, in 21 VI. 2017.
 
Zsolt Török
added a research item
Brackish pond in the Southern part of Grindul Chituc marine levee (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The Dereaua-Nuntasi river, (from the catchment region of the Razim-Sinoe lagoonary area, Romania), was checked out for Perccottus glenii, in 21 VI. 2017.
 
Zsolt Török
added a research item
Dereaua-Nuntasi river, at the county road DJ226 (Constanta county, Romania).
Zsolt Török
added an update
The pond from SW part of Grindul Lupilor marine levee (Danube Delta Biosphere Reserve, Romania), was checked out (for the second time in 2017) for Perccottus glenii, in 21 VI. 2017.
 
Zsolt Török
added a research item
Pond (probably with brackish water) nearby the South-Western limit of Grindul Lupilor marine levee (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The shores of Channel 2 from Grindul Lupilor marine levee (Danube Delta Biosphere Reserve, Romania), were checked out for Perccottus glenii, in 21 VI. 2017.
 
Zsolt Török
added a research item
Channel 2, nearby the bridge from Grindul Lupilor marine levee (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The ponds between the dunes (covered with reed) from the Southern part of Grindul Lupilor marine levee (Danube Delta Biosphere Reserve, Romania), were checked out for Perccottus glenii, in 21 VI. 2017.
 
Zsolt Török
added a research item
Pond between dunes covered with reed, in the Southern part of Grindul Lupilor marine levee (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The Northern end (at the pumping station) of the channel along Cape Doloșman (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 21 VI. 2017.
 
Zsolt Török
added a research item
Image of the Northern end (from the puping station) of the channel along the Northern limit of Cape Doloșman (Danube Delta Biosphere Reserve) - in 21 VI. 2017.
Zsolt Török
added an update
The Southern part of Cape Iancina (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii, in 21 VI. 2017.
 
Zsolt Török
added a research item
Image of the Southern part of Cape Iancina (Danube Delta Biosphere Reserve, Romania).
Zsolt Török
added an update
The Enisala channel, between Lake Babadag and Lake Razim (Danube Delta Biosphere Reserve, Romania), was checked out for Perccottus glenii (for the second time in 2017) in 21 VI. 2017.
 
Zsolt Török
added a research item
Channel Enisala, between Lake Babadag and Lake Razim - part of the Danube Delta Biosphere Reserve (Romania).