scholarly journals The Invasive Round Goby Neogobius melanostomus as a Potential Threat to Native Crayfish Populations

Animals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2377
Author(s):  
Pavel Franta ◽  
Radek Gebauer ◽  
Lukáš Veselý ◽  
Miloš Buřič ◽  
Natalia Z. Szydłowska ◽  
...  
Keyword(s):  
Prey Species ◽  
Round Goby ◽  
Stocking Density ◽  
Neogobius Melanostomus ◽  
Foraging Efficiency ◽  
Macroinvertebrate Communities ◽  
Potential Threat ◽  
Lack Of Information ◽  
In The Wild ◽  
Native Crayfish

Despite the spread of round goby Neogobius melanostomus into freshwater streams, there is a lack of information with respect to its effect on macroinvertebrate communities, especially crustaceans. We studied foraging efficiency of N. melanostomus on Procambarus virginalis and Asellus aquaticus, using a functional response (FR) approach. Stocking density of the prey species was manipulated to determine its effect on consumer utilization, with prey offered separately or combined at 1:1, 3:1, and 1:3 at each tested density. For both prey species, N. melanostomus exhibited type II FR, occasionally with a high proportion of non-consumptive mortality. Procambarus virginalis suffered a significantly higher attack rate compared to A. aquaticus. Neogobius melanostomus killed significantly more of the most prevalent prey, regardless of species. In trials with prey species of equal proportions, a difference in the number of each species killed was observed only at the highest density, at which P. virginalis was preferred. Neogobius melanostomus may be an important driver of population dynamics of prey species in the wild. The non-selective prey consumption makes N. melanostomus a potential threat to macrozoobenthic communities of river tributaries.

scholarly journals Prediction of ecological impact of two alien gobiids in habitat structures of differing complexity

2019 ◽  
Vol 76 (11) ◽  
pp. 1954-1961 ◽  
Author(s):  
Radek Gebauer ◽  
Lukáš Veselý ◽  
Tatyana Vanina ◽  
Miloš Buřič ◽  
Antonín Kouba ◽  
...  
Keyword(s):  
Ecological Impact ◽  
Round Goby ◽  
Neogobius Melanostomus ◽  
Rapid Expansion ◽  
Foraging Efficiency ◽  
Type Ii ◽  
Interspecific Comparison ◽  
Tubenose Goby ◽  
Proterorhinus Semilunaris ◽  
Coarse Gravel

Rapid expansion of round goby (Neogobius melanostomus) and western tubenose goby (Proterorhinus semilunaris) beyond their native ranges calls for urgent management action, particularly in localities with high introduction possibility of the species. We used a comparative functional response (FR) approach to forecast invader ecological impact. We compared their foraging efficiency in three habitat structures: sand, coarse gravel, and coarse gravel with an artificial plant. Both Neogobius melanostomus and Proterorhinus semilunaris showed type II FR in all habitats. Interspecific comparison showed similar handling times in both the gravel and gravel with artificial plant habitats, suggesting similar per capita impact. Intraspecific comparison showed significantly lower handling times of both predators on gravel substrates. Therefore, their ecological impact in such an environment could be higher. Neogobius melanostomus showed higher attack rates on sandy substrates compared with Proterorhinus semilunaris, while no significant differences were observed on other substrates. Our results highlight the importance of interacting factors in management of ecosystems with multiple invaders, as the elimination of invasive Neogobius melanostomus may lead to utilization of the empty niche by alien Proterorhinus semilunaris with similar ecological impact.

Morphometric variability in round goby Neogobius melanostomus (Perciformes: Gobiidae) from the Sea of Azov

2017 ◽  
Vol 26 (2) ◽  
pp. 392-405 ◽  
Author(s):  
O.A. Diripasko ◽  
T.A. Zabroda
Keyword(s):  
Round Goby ◽  
Joint Effect ◽  
Neogobius Melanostomus ◽  
Sea Of Azov ◽  
Morphometric Characters ◽  
One Dimensional ◽  
The Sea Of Azov ◽  
Size Dependent ◽  
Size Variability ◽  
Males And Females

A total of 38 morphometric characters of the round goby Neogobius melanostomus melanostomus (Pallas, 1814) were studied in its native range in the Sea of Azov. The aim was to assess joint effect of sexual dimorphism and size variability on overall variability within groups of samples (populations) using appropriate methods of traditional statistical analysis (one-dimensional and multivariate statistics). Sex and size-dependent variability was studied based on model samples of males and females of different size. Most of the studied morphometric characters of round goby from the Sea of Azov demonstrated statistically significant sex- and size-dependent in-group variability. The pattern of the variability suggests that, for a comparison of round goby from different sea regions and between populations, separate samples of males and females within the range 9–13 cm SL should be examined in order to minimise the effect of the size and sex factors. The approach of searching for the most informative size range could be useful not only for further studies of infraspecific variation but for comparisons between morphologically close gobiin species.

scholarly journals Feeding activity and diet composition of round goby (Neogobius melanostomus, Pallas 1814) in the coastal waters of SE Baltic Sea

2015 ◽  
Vol 44 (4) ◽  
Author(s):  
Artūras Skabeikis ◽  
Jūratė Lesutienė
Keyword(s):  
Baltic Sea ◽  
Coastal Waters ◽  
Diet Composition ◽  
Feeding Activity ◽  
Macoma Balthica ◽  
Round Goby ◽  
Benthic Fauna ◽  
Neogobius Melanostomus ◽  
The Body ◽  
Gut Contents

AbstractFeeding activity and diet composition of round goby were investigated in the south-eastern Baltic Sea, the Lithuanian coastal waters during May-October 2012 in order to determine main feeding objects and seasonal periods when native fauna could be most affected by predation of this highly invasive species. In total, prey represented by 18 taxa was found in the gut contents of dissected fish. Feeding activity of round goby varied depending on the body size, sex and stage of the reproduction period. The gut contents of < 50 mm specimens were dominated by zooplanktonic and meiobenthic organisms, whereas larger individuals (50–99 mm) shifted to amphipods and mollusks. Individuals of the intermediate 100-200 mm length had a variable diet, changing depending on the season; in spring they mostly preyed on Macoma balthica, in summer − on polychaetes, while in autumn the contribution of Mytilus trossulus and fish considerably increased in their diet. Diet composition of individuals ≥ 200 mm was relatively constant in the course of the study with substantial preference to M. balthica. These findings imply that benthic fauna, particularly a newly settled generation of epibenthic mollusks in autumn is under strong predatory pressure of the round goby.

Genetic Differentiation of the Round Goby (Neogobius melanostomus) from Certain Localities of the Black and Azov Sea Basin Using Microsatellite Loci

2021 ◽  
Vol 55 (3) ◽  
pp. 236-247
Author(s):  
S. I. Tarasjuk ◽  
V. V. Zamorov ◽  
O. V. Zaloilo ◽  
O. Iu. Bielikova ◽  
D. B. Radionov
Keyword(s):  
Genetic Differentiation ◽  
Microsatellite Loci ◽  
Round Goby ◽  
Neogobius Melanostomus ◽  
Azov Sea

scholarly journals Use of round goby ( Neogobius melanostomus ) processing waste in bioeconomy

2017 ◽  
Vol 128 ◽  
pp. 484-490 ◽  
Author(s):  
Maira Melvere ◽  
Kaspars Ivanovs ◽  
Jelena Pubule ◽  
Dagnija Blumberga
Keyword(s):  
Round Goby ◽  
Neogobius Melanostomus ◽  
Processing Waste

Snowshoe hare feeding behavior responds to coyote and moose cues at diverse vegetation densities

2020 ◽  
Vol 101 (3) ◽  
pp. 710-717
Author(s):  
Zachary K Lankist ◽  
Christine R Maher
Keyword(s):  
Chemical Cues ◽  
Prey Species ◽  
Vegetation Density ◽  
Vegetative Cover ◽  
Feeding Sites ◽  
Risk Of Death ◽  
Lack Of Information ◽  
Snowshoe Hares ◽  
Number Of Visits ◽  
Indirect Cues

Abstract Heterospecific competitors can use chemical cues left by dominant species to avoid aggressive interactions. Similarly, prey avoid chemical cues from predators at feeding sites, presumably because risk of death outweighs the benefit of food. This study addressed the lack of information regarding mammals’ avoidance of direct cues from competitors and also examined how indirect cues, i.e., vegetative cover, affect foraging behavior. To test if chemical cues and vegetative cover alter the number of visits by prey species and time spent at feeding plots, we observed snowshoe hares (Lepus americanus) in plots containing coyote (Canis latrans; predator) and moose (Alces alces; competitor) urine across a spectrum of vegetation densities. Snowshoe hares significantly reduced number of visits to plots that contained coyote or moose urine. In plots treated with coyote urine, number of visits decreased significantly as plots became more densely vegetated. Neither chemical cues nor vegetation density affected time spent in plots. These results suggest that competition between snowshoe hares and moose has selected for an avoidance response. This study also reinforces the idea that an increase in vegetation density could prove disadvantageous to prey, perhaps because some predators use dense vegetation to their advantage.

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