scholarly journals Egg predation on native fish by invasive round goby revealed by species-specific gut content DNA analyses

2019 ◽  
Author(s):  
Elisabeth Lutz ◽  
Philipp Hirsch ◽  
Karen Bussmann ◽  
Joschka Wiegleb ◽  
Hans-Peter Jermann ◽  
...  
Keyword(s):  
Freshwater Fish ◽  
Round Goby ◽  
Neogobius Melanostomus ◽  
Native Fish ◽  
Gut Content ◽  
Egg Predation ◽  
Spawning Period ◽  
Molecular Approaches ◽  
Longitudinal Connectivity ◽  
Species Specific

1.Conservation of riverine fish typically aims at improving access to spawning grounds and the restoration of longitudinal connectivity requires substantial investments. However, the removal of migration barriers also enables the upstream invasion of non-native species into spawning areas, with potential negative effects on recruitment of threatened freshwater fish through egg or fry predation. 2.Detecting egg predation is often challenging. Visual gut inspections are thought to underestimate predation on soft material such as eggs and fry, which hampers the discovery of predators preying upon these life-stages. For soft materials, molecular approaches may therefore offer a more sensitive tool for detection. 3.Here, we uncover such a macroscopically invisible conservation issue caused by predation of invasive round goby (Neogobius melanostomus) predation on eggs or fry of threatened common nase (Chondrostoma nasus) in Switzerland.4.In addition, this manuscript presents species-specific molecular assays for five more valuable native fish, including endangered salmonid and cyprinid river spawners, and confirms the applicability of the assays in a series of laboratory and field feeding experiments involving eggs and fish tissue. The manuscript also provides a guiding tool for conservation managers regarding the use and applicability of different molecular approaches in gut-content analysis.5.Our results inspire recommendations for local conservation measures such as a temporary reduction of round goby densities at the spawning site prior to the spawning period, and demonstrate how the targeted application of species-specific molecular markers can inform freshwater fish management.

Predation on native fish eggs by invasive round goby revealed by species‐specific gut content DNA analyses

2020 ◽  
Vol 30 (8) ◽  
pp. 1566-1577
Author(s):  
Elisabeth Lutz ◽  
Philipp Emanuel Hirsch ◽  
Karen Bussmann ◽  
Joschka Wiegleb ◽  
Hans‐Peter Jermann ◽  
...  
Keyword(s):  
Round Goby ◽  
Native Fish ◽  
Gut Content ◽  
Fish Eggs ◽  
Dna Analyses ◽  
Species Specific

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

scholarly journals Examination of Taxonomic Uncertainties Surrounding Brucella abortus bv. 7 by Phenotypic and Molecular Approaches

2013 ◽  
Vol 80 (5) ◽  
pp. 1570-1579 ◽  
Author(s):  
Bruno Garin-Bastuji ◽  
Virginie Mick ◽  
Gilles Le Carrou ◽  
Sebastien Allix ◽  
Lorraine L. Perrett ◽  
...  
Keyword(s):  
Brucella Abortus ◽  
Variable Number Tandem Repeat ◽  
Variable Number ◽  
Epidemiological Methods ◽  
Content Type ◽  
Phenotypic Profile ◽  
Molecular Approaches ◽  
Content Classification ◽  
Species Specific ◽  
Kenyan Strain

ABSTRACTBrucellataxonomy is perpetually being reshuffled, at both the species and intraspecies levels. Biovar 7 ofBrucella abortuswas suspended from theApproved Lists of Bacterial NamesBrucellaclassification in 1988, because of unpublished evidence that the reference strain 63/75 was a mixture ofB. abortusbiovars 3 and 5. To formally clarify the situation, all isolates previously identified asB. abortusbv. 7 in the AHVLA and ANSES strain collections were characterized by classical microbiological and multiple molecular approaches. Among the 14 investigated strains, including strain 63/75, only four strains, isolated in Kenya, Turkey, and Mongolia, were pure and showed a phenotypic profile in agreement with the former biovar 7, particularly agglutination with both anti-A/anti-M monospecific sera. These results were strengthened by molecular strategies. Indeed, genus- and species-specific methods allowed confirmation that the four pure strains belonged to theB. abortusspecies. The combination of most approaches excluded their affiliation with the recognized biovars (biovars 1 to 6 and 9), while some suggested that they were close to biovar 3.These assays were complemented by phylogenetic and/or epidemiological methods, such as multilocus sequence analysis (MLSA) and variable-number tandem repeat (VNTR) analysis. The results of this polyphasic investigation allow us to propose the reintroduction of biovar 7 into theBrucellaclassification, with at least three representative strains. Interestingly, the Kenyan strain, sharing the same biovar 7 phenotype, was genetically divergent from other three isolates. These discrepancies illustrate the complexity ofBrucellataxonomy. This study suggests that worldwide collections could include strains misidentified asB. abortusbv. 7, and it highlights the need to verify their real taxonomic position.

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