FEEDING OF THE INVASIVE ROUND GOBY Neogobius melanostomus (Perciformes: Gobiidae) IN THE SOUTH-EASTERN BALTIC

2021 ◽  
Vol 14 (4) ◽  
pp. 43-53
Author(s):  
A. V. Guschin ◽  
E. E. Ezhova ◽  
Е. А. Borovikova

The feeding of the Ponto-Caspian invasive round goby Neogobius melanostomus in the coastal zone of the Baltic Sea near the Curonian Spit, in the Vistula Lagoon and in the eastern part of the Gdansk Bay has been studied. The round goby in coastal waters prefers biotopes with various shelters - boulders, large pebbles, etc. In the diet of the round goby, there is a significant proportion of fouling organisms inhabiting these objects. If fouling organisms are absent for some reason, the goby switches to other types of prey: molluscs, free-living crustaceans, insect larvae and other groups of benthic and nektobenthic organisms. There is a connection between the food spectrum and the size of the round goby: large individuals consume larger prey. The round goby implements a food strategy, which consists in the fact that all organisms that are available territorially and in size are used for food. Such food plasticity is one of the reasons for the wide expansion of this species outside the native range.

Author(s):  
Vladimir Chechko ◽  
Vladimir Chechko ◽  
Boris Chubarenko ◽  
Boris Chubarenko

Vistula Lagoon is the second largest lagoon in the Baltic Sea with maximum depth 5.2 m and average depth 2.7 m. Water volume and area are 2.3 km3 and 838 km2. Lagoon is connected with the Baltic Sea by single inlet 400 m wide and 10-12 m deep. Sediment budget estimation were made using literature sources, results of field measurements (hydrology, suspended sediment content, upper layer sediment structure, direct measurements of sedimentation in summer and winter conditions). The budget for terrigene and biogenic components of sediments were made, considering their contributions from the rivers, inflow from the Baltic Sea, coastal erosion and aerial flux, biological production within the lagoon, totally - ca. 730 thousands ton per year. Nearly half of total gain is washed out (105 and 244 thousands ton per year of terrigene and biogenic components), another half is dissolved and mineralized (biogenic component), and only 10% is deposited on the bottom, resulting in rather low sedimentation rate - 0.4 mm/year during last 100 years. Paper explain the reason of difference with estimation made in (Chubarenko&Chubarenko, 2002) and concludes that the clarification of estimates of the amounts of sediments transported from the lagoon to the Baltic Sea is a critical element for understanding the evolution of the Vistula Lagoon as a sedimentation system.


Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1328
Author(s):  
Michał Szydłowski ◽  
Wojciech Artichowicz ◽  
Piotr Zima

The Vistula Lagoon is located in both Poland and Russia along the southern coast of the Baltic Sea. It is connected to the Baltic Sea in the Russian part by the Strait of Baltiysk. The purpose of the paper is to identify the dominant factors underlying the water level variation mechanism at Tolkmicko in the Vistula Lagoon, revealed by a statistical analysis of the measured data and a discussion on the inflow and outflow transport variation through the strait, estimated by numerical modeling. Seawater transport is exceptionally valuable in terms of the hydrological water balance in the lagoon. Historical research on the hydrology of the lagoon shows that the water exchange in the lagoon is quite complex due to the presence of several different sources of water balance, such as seawater inflow, river inflow, groundwater inflow, precipitation, and evaporation. Unfortunately, there are no current data on seawater inflow and outflow through the Strait of Baltiysk due to the lack of continuous flow measurements in the strait. A novelty of the current work is an in-depth statistical analysis of the water level variation in the Polish part of the lagoon over a long time period and an estimation of water transport through the Strait of Baltiysk by use of a numerical model. The model reproduces well the water level variation responding to variations in the sea level outside the lagoon and the wind action over the lagoon. The years 2008–2017 were chosen as the analysis period. A two-dimensional free surface shallow water numerical model of the lagoon was adapted to simulate the water level variation in view of the wind over the lagoon and the sea level variation at one open boundary. Finally, it was concluded that the water level variation on the Polish side of the Vistula Lagoon is dominated by two factors: the water level in the Gulf of Gdańsk and the wind over the lagoon. The average annual marine water inflow into the Vistula Lagoon was estimated to be equal to 15.87 km3.


Author(s):  
Э.Б. Зальцман

В работе характеризуются новые материалы, полученные в ходе исследований неолитических (по прибалтийской периодизации) поселений побережья Вислинского залива. Данные древности, по всем признакам, относятся к культуре воронковидных кубков, памятники которой ранее в регионе были неизвестны. Все материалы КВК выявлены на поселениях, основные культурные комплексы с которых относятся к приморской культуре шнуровой керамики (рис. 1). Незначительные по размерам стоянки КВК существовали здесь до прихода населения приморской культуры. В Ушаково 3 керамика КВК найдена в культурном слое в восточной части раскопа, где она залегала в основном отдельно от керамики приморской культуры (рис. 2–4). В Прибрежном кроме керамических материалов зафиксированы следы 2 построек с двухрядной столбовой конструкцией стен (рис. 5). Постройки наземного типа, удлиненной формы, шириной не более 3,2 м. Технологические и морфологические характеристики фрагментов керамики, обнаруженной в пределах построек, не оставляют сомнений в том, что эти комплексы принадлежат КВК (рис. 6: 1, 13). Кроме того, здесь же выявлены две амфоры с типичными чертами баденизации в КВК (рис. 6: 14, 15). Керамика КВК встречалась также и в культурном слое поселения (рис. 7: 1, 3, 4, 6, 7, 10, 12). Все материалы КВК с поселений Ушаково 3 и Прибрежное датируются в диапазоне 3500–3100 гг. CalBC (Приложение 1). Наиболее вероятно, что небольшие по численности группы населения КВК проникли в прибрежную зону около середины IV тыс. до н. э., когда на этой территории уже продолжительное время существовали местные сообщества цедмарской неолитической культуры. The paper characterizes new materials obtained during the excavations of Neolithic sites (according to the Baltic periodization) in the Vistula Lagoon coast. These antiquities are attributed to the Funnel Beaker culture the sites of which have not been discovered in this region before. All FBC materials were identified at settlements where the main cultural assemblages are attributed to the Primorskaya Corded Ware Culture (Fig. 1). Small FBC sites had existed in this area before the arrival of the Primorskaya culture population. Ushakovo 3 revealed FBC ceramics in the occupation layer located in the eastern part of the excavation trench where, in most cases, these artifacts were lying separately from the Primorskaya culture ceramics (Fig. 2–4). Traces of two constructions with a double-row pillar wall structure (Fig. 5) were recorded at Pribrezhnoye. Technological and morphological characteristics of the ceramics discovered in the constructions leave no doubt that these assemblages belong to the FBC (Fig. 6: 1, 13). Two amphorae with typical features of «badenization» in the FBC were discovered at this site as well (Fig. 6: 14, 15). The FBC ceramics also occurred in the occupation layer of the site (Fig. 7: 1, 3, 4, 6, 7, 10, 12). All FBC materials from Ushakovo 3 and Pribrezhnoye fall within 3500–3100 CalBC (Appendix 1). Most likely, around mid 4th millennium BC small FBC population groups reached the coastal area which had been already inhabited by local Zedmar Neolithic communities for a long time.


2019 ◽  
Vol 48 (3) ◽  
pp. 236-246 ◽  
Author(s):  
Dagmara J. Wójcik-Fudalewska ◽  
Monika Normant-Saremba ◽  
Agata Kolasa ◽  
Pedro M. Anastácio

Abstract The feeding ecology of the Chinese mitten crab Eriocheir sinensis was studied by analyzing the stomach fullness and its content with regard to sex, size and brackish water habitats occurring on the coast of the Baltic Sea (Gulf of Gdańsk and Vistula Lagoon, Poland) and the Atlantic (Tagus Estuary, Portugal). The presented results show that neither the site, sex (except the Gulf of Gdańsk) nor the size of an individual had a significant (p > 0.05) effect on the stomach fullness of E. sinensis. However, the type of food consumed was significantly (p < 0.05) correlated with the inhabited locality. The stomachs of crabs contained the remains of animal and plant origin, as well as detritus. The remains of animals (Bivalvia, Amphipoda, Gastropoda and Polychaeta) were more frequently found in the crabs from the Gulf of Gdańsk, while the remains of plants (Tracheophyta, Chlorophyta) were most often found in the stomachs of crabs from the Vistula Lagoon and the Tagus Estuary. Detritus was found only in the Gulf of Gdańsk and the Vistula Lagoon. Research indicates that the feeding ecology of omnivore E. sinensis is habitat specific, which should be taken into account when assessing the risk associated with this invasive species.


Sign in / Sign up

Export Citation Format

Share Document