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Fig. 4 in Shape Analysis Of Otoliths Of The Round Goby, Neogobius Melanostomus (Gobiiformes, Gobiidae), From The Black Sea Basin

Fig. 4. Dendrogram for Euclidian distances between otolith contours of round goby (n = 786) from nine sampling areas, sampled during three years of study. Stippled line represents five clusters representing pairs of similar sampling sites. It shows that similarity of the sampling sites does not follow the pattern of their allocation chain along the coast of the Black sea visible in fig. 1.

Fig. 1 in Shape Analysis Of Otoliths Of The Round Goby, Neogobius Melanostomus (Gobiiformes, Gobiidae), From The Black Sea Basin

Fig. 1. Map of the study area with sampling localities: 1 — Lake Yalpuh; 2 — Snake Island; 3 — Dniester Estuary; 4 — Gulf of Odesa; 5 — Khadzhibey Estuary; 6 — Tylihul Estuary; 7 — Dnipro-Bug Estuary; 8 — Dzharylhach Bay; 9 — Obytichna Bay of the Sea of Azov.

Fig. 2 in Shape Analysis Of Otoliths Of The Round Goby, Neogobius Melanostomus (Gobiiformes, Gobiidae), From The Black Sea Basin

Fig. 2. Basic morphometric characters used for the shape description of the round goby otoliths. At the internal surface: 1 — dorsal part; 2 — ventral part; 3 — anterior margin; 4 — posterior margin; 5 — rostrum; 6 — pararostrum; 7 — acoustic groove.

Fig. 3 in Shape Analysis Of Otoliths Of The Round Goby, Neogobius Melanostomus (Gobiiformes, Gobiidae), From The Black Sea Basin

Fig. 3. The visualized reconstruction of the round goby otolith contour features predicated upon the first six Principal components (see Material and method for details).

Fig. 3 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby

Fig. 3. Mean abundance of Diplostomum spp. in two-year old yellow perch (Perca flavescens) at sites from the three fluvial lakes of the St. Lawrence River between years before and after the establishment of the invasive round goby. Data are expressed as mean number of metacercariae of the genus Diplostomum per fish including uninfected ones ± SEM. Significant differences among years within each locality are indicated by different letters beside histograms. Fish silhouettes within graph panels highlight the presence of the invasive round goby at that given site/year(s), the icon being gray if the species was only occasionally recorded. Main ring-billed gull colonies are illustrated on the map by bird silhouettes: 1 = Cornwall; 2 = Beauharnois; 3 = ̂ILe Deslauriers; 4 = ̂Ile Lefebvre.

Fig. 5 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby

Fig. 5. Trends in ring-billed gull (Larus delawarensis) populations (A) and in water levels in the St. Lawrence River (B) during the study period (1998‾2016). A: The solid black curve shows the variation over time of the total number of ring-billed gulls recorded along the St. Lawrence River from Cornwall to Trois-Rivìeres whereas dotted curves depict the change in gull counts in each of the main colonies within this area. The numbered bird icons match those shown in Figs. 1 and 3: Bird 1 = Cornwall; bird 2 = Beauharnois; bird 3 = ̂ILe Deslauriers; bird 4 = ̂Ile Lefebvre. B: Monthly mean water levels in April (green) and September (gray) at the Montreal Jetty no 1 station (solid lines) and at the Summerstown station (dashed lines). (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

Fig. 2 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby

Fig. 2. Variation in Diplostomum spp. mean abundance over years in Lake St. Francis (LSF-1) in (A) one-year old yellow perch (Perca flavescens) and (B) one-year old golden shiner. Data are expressed as mean number of metacercariae of the genus Diplostomum per fish including uninfected ones ± SEM. Significant differences among years within each locality are indicated by different letters above histograms. Black fish silhouettes within graph panels illustrate the occurrence of the invasive round goby among the fish captured at that site. See Fig. 3 for site location.

Fig. 1 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby

Fig. 1. Temporal changes in the mean abundance of Diplostomum spp. in spottail shiners (Notropis hudsonius) (green circle) and round gobies (Neogobius melanostomus) (black square) at two sites in the St. Lawrence River. Data are expressed as mean numbers of metacercariae of Diplostomum spp. per fish including uninfected ones ± SEM. Significant differences among years within each locality are indicated by different lower-case letters (round gobies) and upper-case letters (spottail shiners). Arrows within graph panels point to year of first sighting of the invasive round goby at each site. On the background map, sampling sites (̂Ilet Vert = IVT, ̂Iles de la Paix = IPA) are identified and the host species examined are represented by different fish silhouettes (green = spottail shiners, black = round gobies). Bird silhouettes indicate where main colonies of ring-billed gulls are localized: 2 = Beauharnois; 3 = ̂ILe Deslauriers. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

Fig. 6 in Enigmatic decline of a common fish parasite (Diplostomum spp.) in the St. Lawrence River: Evidence for a dilution effect induced by the invasive round goby

Fig. 6. Potential mechanisms to explain the observed sharp decline of Diplostomum spp. infection in fish in the St. Lawrence River. Those involving a dilution effect induced by the exotic round goby (Neogobius melanostomus) appears in pale red rectangles with rounded corners. Other biotic or abiotic factors are displayed in blue rectangles. Gastropod illustration, representing lymnaeid snails, is a graphic art by Tracey Saxby, provided by the Integration and Application Network (IAN), University of Maryland Center for Environmental Science (www.ian.umces.edu/imagelibrary). The bird image, used to illustrate a ring-billed gull (Larus delawarensis), is a public domain clipart downloaded from www. openclipart.org. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

opencc-by-4.0Jun 2023View details →

Boldness and physiological variation in round goby populations along their Baltic Sea invasion front

Data/code for the paper: Galli, A., Behrens, J. W., Gesto, M., & Moran, N. P. (2023). Boldness and physiological variation in round goby populations along their Baltic Sea invasion front. Physiology & Behavior, 114261. <a href="https://doi.org/10.1016/j.physbeh.2023.114261">https://doi.org/10.1016/j.physbeh.2023.114261</a>

opencc-zeroJan 2022View details →

Supplementary data to "Alternative reproductive tactics are associated with sperm performance in invasive round goby from two different salinity environments"

During male-male competition, evolution can favor alternative reproductive tactics. This often results in a dominant morph that holds a resource, such as a nest for egg laying, competes with a smaller sneaker morph that reproduces by stealing fertilizations. The salinity environment can influence male growth rates, e.g. via osmoregulatory costs, which in turn may influence the use of sneaker tactics for small males competing for mating opportunities. Salinity can also affect sperm directly; however, little is known of how salinity influences sneaker tactics through sperm performance. We sampled males of the invasive round goby (Neogobius melanostomus) from two environments, a freshwater river and a brackish estuary. This fish has two male morphs: nest-holding dark males and non-nest-holding light males. We examined the role of water salinity of 0, 8 and 16 on sperm performance and found that in estuarine males, a salinity of 0 reduced sperm velocity compared to a salinity of 8 and 16. Riverine males had low velocity in all salinities. Sperm viability also decreased by over 30 % in 0 salinity, compared to 8 and 16, for fish from both environments. Gobies produce ejaculate contents in specialized glands that could in theory shield sperm in an adverse environment. However, gland contents did not improve sperm performance in our tests. Body mass and age estimates indicate that riverine males invested more in somatic growth compared to estuarine males. Estuarine light morph males had a high enough gonadosomatic index to indicate sneaker tactics. We propose that when sperm performance is low, such as for the riverine males, sneaker tactics are ineffective, and will be selected against or phenotypically suppressed. Instead, we interpret the increased investment in somatic growth found in riverine males as a life-history decision that is advantageous when defending a nest in the next reproductive season.

opencc-zeroJun 2022View details →

Data supporting: Invader at the edge - genomic origins and physiological differences of round gobies across a steep urban salinity gradient

Species invasions are a global problem of increasing concern, especially in highly connected aquatic environments. Despite this, salinity conditions can pose physiological barriers to their spread and understanding them is important for management. In Scandinavia's largest cargo port, the invasive round goby (Neogobius melanostomus), is established across a steep salinity gradient. We used 12 937 SNPs to identify the genetic origin and diversity of three sites along the salinity gradient and round goby from western, central and northern Baltic Sea, as well as north European rivers. Fish from two sites from the extreme ends of the gradient were also acclimated to freshwater and seawater, and tested for respiratory and osmoregulatory physiology. Fish from the high salinity environment in the outer port showed higher genetic diversity, and closer relatedness to the other regions, compared to fish from lower salinity upstream the river. Fish from the high salinity site also had higher maximum metabolic rate, fewer blood cells and lower blood Ca2+. Despite these genotypic and phenotypic differences, salinity acclimation affected fish from both sites in the same way: seawater increased the blood osmolality and Na+ levels, and freshwater increased the levels of the stress hormone cortisol. Our results show genotypic and phenotypic differences over short spatial scales across this steep salinity gradient. These patterns of the physiologically robust round goby are likely driven by multiple introductions into the high salinity site, and a process of sorting, likely based on behaviour or selection, along the gradient. Since this euryhaline fish risks spreading from this area, seascape genomics and phenotypic characterisation can inform management strategies even within an area as small as a coastal harbour inlet.

opencc-zeroAug 2022View details →

Data for: Differential habitat use of a notorious invasive fish, the round goby, in a translocation-relevant system

Anthropogenic structures can form novel ecosystem niches. Invasive species are often particularly successful in occupying these habitats and utilize them as beachheads for further spread. The invasive round goby (Neogobius melanostomus, Pallas 1814), an inherently bottom-dwelling fish, uses vertical harbour walls as habitat, enabling them to reach boats (i.e. potential translocation vectors). To evaluate the relevance of vertical habitat use for population dynamics and translocation, we exemplary investigated a population of round gobies in a harbour ecosystem. Specifically, we investigated differences in trophic niche characteristics, individual trophic specialization, phenotypic traits, and breeding frequency in wall versus bottom dwelling round gobies. Habitat-characteristic dietary signatures indicated habitat partitioning during the breeding season. Trophic niches overlapped but were clearly distinguishable between the habitats: walls were inhabited by 1.4 times more trophic generalists than specialists, while the bottom was inhabited by 2.1 times more trophic specialists. Breeding frequency was 24 times higher on the walls than on the bottom. After the reproductive season, we found a higher similarity in trophic ecology of gobies inhabiting the two habitats, and differences in abundance, size, and condition. These results are in line with winter migrations to deeper habitats, which are common in round gobies in lentic and marine ecosystems. Our results suggest a high potential for microgeographic adaptation to either horizontal or vertical habitat use in invasive round gobies. We demonstrated that male gobies using the walls during the breeding season are larger and heavier, suggesting that wall-climbing may select for more competitive individuals. Additionally, the overall abundance of round gobies likely increases with the additional use of vertical habitat space, which may lead to higher propagule pressure. The ability to exploit anthropogenic habitats, and a higher translocation probability of competitive individuals, can contribute to the invasion success of round gobies in anthropogenically influenced aquatic systems.

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Figure 2 in First record of round goby Neogobius melanostomus Pallas, 1814 (Pisces: Gobiidae) in Bosnia and Herzegovina

Figure 2. Neogobius melanostomus from Una river.

opencc-by-4.0Feb 2018View details →

publicAug 2022View details →

Data for: Differential habitat use of a notorious invasive fish, the round goby, in a translocation-relevant system

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publicSep 2024View details →

Characterization of the reproductive strategy of invasive round goby (Neogobius melanostomus) in the Upper Danube River

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publicJun 2022View details →

Data supporting: Invader at the edge - genomic origins and physiological differences of round gobies across a steep urban salinity gradient

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