scholarly journals Flow, force, behaviour: assessment of a prototype hydraulic barrier for invasive fish

Hydrobiologia ◽  
2021 ◽  
Author(s):  
Joschka Wiegleb ◽  
Philipp E. Hirsch ◽  
Frank Seidel ◽  
Georg Rauter ◽  
Patricia Burkhardt-Holm
Keyword(s):  
Flow Field ◽  
Native Species ◽  
Water Discharge ◽  
Species Conservation ◽  
Round Goby ◽  
Live Fish ◽  
Vertical Slot ◽  
Migration Barriers ◽  
Machine Learning Approach ◽  
Swimming Trajectories

AbstractMigration barriers being selective for invasive species could protect pristine upstream areas. We designed and tested a prototype protective barrier in a vertical slot fish pass. Based on the individuals’ swimming responses to the barrier flow field, we assumed this barrier would block the ascension of the invasive round goby, but allow comparable native species (gudgeon and bullhead) to ascend. The barrier was tested in three steps: flow description, quantification of forces experienced by preserved fish in the flow field, and tracking the swimming trajectories of ca. 43 live fish per trial and species. The flow and the forces were homogenous over the barrier, though gudgeon experienced significantly smaller forces than round goby or bullhead. The swimming trajectories were distinct enough to predict the fish species with a random forest machine learning approach (92.16% accuracy for gudgeon and 85.24% for round goby). The trajectories revealed round goby and gudgeon exhibited increased, but varied, swimming speeds and straighter paths at higher water discharge. These results suggest that passage of round goby was prevented at 130 L/s water discharge, whereas gudgeon and bullhead could pass the barrier. Our findings open a new avenue of research on hydraulic constructions for species conservation.

scholarly journals Role of Transient Characteristics in Fish Trajectory Modeling

2020 ◽  
Author(s):  
zhu gao ◽  
zu hao zhou ◽  
Helge I Andersson
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Turbulent Flow ◽  
Transient Flow ◽  
Simultaneous Recording ◽  
Fish Locomotion ◽  
Vertical Slot ◽  
Turbulent Flow Structure ◽  
General Method

In this paper, we analyzed the live fish trajectory recorded from an experiment in an experimental vertical slot fishway. Combined with a numerical simulation, we demonstrated that randomness shown in fish trajectory might not merely be attributed to fish's random choices in its swimming, also could be an adaption consequence to the bulk unsteady turbulent flow structure. Simple superposing the fish trajectory on the time-averaged flow field obtained either by interpolating on discrete point measurements or numerical simulation is not an ideal method for fish movement description in fishway engineering. How to model the fish paths in transient flow and the necessity of simultaneous recording of the flow field and the fish locomotion are challenging topics. The suggested spectrum analysis of the flow field may provide a new general method to reproduce the fish trajectory in a complex turbulent flow.

Urban conservation gardening in the decade of restoration

2021 ◽  
Author(s):  
Ingmar Staude ◽  
Josiane Segar ◽  
Corey Thomas Callaghan ◽  
Emma Ladouceur ◽  
Jasper Meya ◽  
...  
Keyword(s):  
Plant Species ◽  
Native Species ◽  
Species Conservation ◽  
Plant Conservation ◽  
Native Plant ◽  
Nature Protection ◽  
Urban Conservation ◽  
Native Plant Species ◽  
Native Seed ◽  
Conservation Gardening

Global commitments to species conservation have failed to halt systematic widespread declines in plant species. Current policy interventions, such as protected areas and legal species legislation, remain insufficient, and there is an urgent need to engage novel approaches and actors in conservation. Here, we propose that urban conservation gardening, namely the cultivation of declining native plant species in public and private green spaces, can be one such approach. Conservation gardening can address key (a)biotic drivers of species decline, act as a critical dispersal pathway and increase the occupancy of declining native species. We identify policy mechanisms to upscale conservation gardening to a mainstream activity by reforming the existing horticultural market into an innovative nature protection instrument. This involves incentivizing the integration of the native seed sector, leveraging existing certification and labelling schemes, promoting consumer access, as well as building citizen-science projects to foster public engagement. Mainstreamed conservation gardening can be an economically viable, sustainable, and participatory measure that complements traditional approaches to plant conservation.

scholarly journals Role of Transient Characteristics in Fish Trajectory Modeling

2020 ◽  
Vol 12 (17) ◽  
pp. 6765
Author(s):  
Gao Zhu ◽  
Zuhao Zhou ◽  
Helge I Andersson
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Transient Flow ◽  
Silver Carp ◽  
Simultaneous Recording ◽  
Trajectory Modeling ◽  
Fish Locomotion ◽  
Vertical Slot ◽  
Ideal Method

In this experiment, we analyzed live fish (silver carp) trajectories recorded in an experimental vertical-slot fishway. Combined with a numerical simulation, we demonstrated that randomness shown in fish trajectories might not merely be attributed to the fish’s random choices in its swimming, but could also be a consequence of adaption to the bulk unsteady turbulent flow structures. Simple superposition of a fish trajectory on the time-averaged flow field obtained either by interpolating on discrete point measurements or numerical simulation data is not an ideal method for description of fish movement. How to model the fish paths in transient flow and the necessity of simultaneous recording of the flow field and the fish locomotion are challenging topics. We also discussed the possible integration of currently existing methods to promote the development of fish trajectory modeling.

Aggression and sociality: conflicting or complementary traits of a successful invader?

Behaviour ◽  
2015 ◽  
Vol 152 (2) ◽  
pp. 127-146 ◽  
Author(s):  
Pauline M. Capelle ◽  
Erin S. McCallum ◽  
Sigal Balshine
Keyword(s):  
Native Species ◽  
Round Goby ◽  
Invasion Biology ◽  
Neogobius Melanostomus ◽  
Conspecific Density ◽  
Species Invasions ◽  
Rapid Spread ◽  
Males And Females ◽  
Successful Invader ◽  
Forming Behaviour

Invasion biology research has identified two juxtaposing behavioural traits, aggressiveness and sociality, that may both increase the success of species invasions. Highly aggressive invaders can out-compete native species for resources, while social gregarious invaders can tolerate high conspecific density. In order to tease apart the effects of aggressive versus social tendencies on the success of invasive species, we studied round goby (Neogobius melanostomus), a highly successful invasive fish species now common in the Laurentian Great Lakes. While round goby are well known for being aggressive, much less is known about their tendency to affiliate with conspecifics, in spite of the fact that they thrive in extremely high densities in many of their invaded habitats. We collected round goby from Hamilton Harbour, ON, Canada and conducted three separate experiments to explore group-forming behaviour by measuring preference for conspecifics. We found that round goby have a strong preference to associate with a single conspecific, and that both males and females showed this preference. No overall preference was detected for large versus small groups of conspecifics. Females chose the safety of a shelter over associating with a conspecific but males were equally attracted to conspecifics as shelter. Our results provide new insight into how interactions between aggressive and social behaviours play a role in the rapid spread of invasive round goby.

Round goby movement patterns in a non-navigable river

2020 ◽  
Vol 77 (3) ◽  
pp. 475-483
Author(s):  
Luděk Šlapanský ◽  
Michal Janáč ◽  
Kevin Roche ◽  
Pavel Jurajda
Keyword(s):  
Native Species ◽  
Field Experiments ◽  
Round Goby ◽  
Neogobius Melanostomus ◽  
Species Dispersal ◽  
Dispersal Patterns ◽  
Long Distance ◽  
Movement Rates ◽  
Established Population ◽  
Future Management

Understanding non-native species dispersal is vital for their future management. The round goby (Neogobius melanostomus) has greatly extended its range since the 1990s, with commercial shipping being the main vector. However, our knowledge regarding their secondary dispersal from points of introduction is surprisingly limited. In this study, a series of field experiments were undertaken on a mid-sized river to assess goby dispersal patterns within an established population, following a simulated release of a large number of propagules, or at a simulated invasion front. Most of the established population remained stationary and just a few individuals undertook long-distance dispersal (principally upstream). Mean distance travelled was 1.1 m·day−1 (max. 29.6 m·day−1). While site fidelity appeared to last for most of the year (including winter), it was surprisingly relaxed during the spawning season. Concentrated release of a large number of propagules resulted in appreciably greater movement rates than in the established population, with upstream movement again dominating. In general, smaller, mostly male fish tended to move further and appeared as first colonizers in uninvaded areas.

scholarly journals Summer microhabitat use and overlap by the invasive Round Goby (Neogobius melanostomus) and native darters in the Trent River (Ontario, Canada)

2019 ◽  
pp. 23
Author(s):  
Scott M. Reid
Keyword(s):  
Habitat Suitability ◽  
Native Species ◽  
Round Goby ◽  
High Water ◽  
Neogobius Melanostomus ◽  
Microhabitat Use ◽  
Intermediate Water ◽  
Habitat Differences ◽  
Species Declines ◽  
Water Depths

Understanding the impacts of the invasive Round Goby (Neogobius melanostomus) is important for North American native fish conservation. One proposed mechanism for native species declines is competition for habitat. In this study, summer habitat use by Round Goby and Channel Darter (Percina copelandi) and Logperch (P. caprodes) was studied in the Trent River (Canada). Spot-electrofishing and systematic habitat sampling were used to measure habitat availability and use. Suitability for all species varied across the range of habitat conditions. At Glen Ross, habitat suitability for Channel Darter and Round Goby was highest at intermediate water depths (0.2–0.6 m), lowest at high water velocities (> 1.0 ms−1) and increased with greater amounts of gravel and cobble. There were no significance habitat differences between capture locations of the two species. At Meyer's Reach, Logperch and Round Goby habitat suitability was highest at intermediate water depths (0.4–0.6 m) and where gravel and cobble were abundant. The relationship between suitability and water velocity differed between species, with moderate velocities less suitable for Round Goby. The amount of boulder and bedrock at capture locations of each species differed. Results indicate that competition for habitat with Round Goby will vary among darter species.

Non-native fish in Belarusian and Polish areas of the European central invasion corridor

2011 ◽  
Vol 40 (1) ◽  
Author(s):  
Vitaliy Semenchenko ◽  
Joanna Grabowska ◽  
Michal Grabowski ◽  
Viktor Rizevsky ◽  
Michail Pluta
Keyword(s):  
Native Species ◽  
Round Goby ◽  
Gibel Carp ◽  
The Black Sea ◽  
Amur Sleeper ◽  
Pungitius Pungitius ◽  
Baltic Basin ◽  
Topmouth Gudgeon ◽  
The Baltic ◽  
Invasion Corridor

AbstractThis is the first comprehensive review to examine the role of the central European invasion corridor on fish introductions into Belarusian and Polish inland waters (Dnieper-Bug-Vistula-Oder-Elbe-Spree-Havel). Historical and recent data were assessed, including the results of a 2003–2008 survey along the Belarusian and Polish sections of the corridor. Since the eighteenth century, at least six fish species of Ponto-Caspian origin have spread via the corridor and migrated westwards to the Baltic basin, with five species found in recent surveys, namely the monkey goby Neogobius fluviatilis, round goby N. melanostomus, racer goby N. gymnotrachelus, tubenose goby Proterorhinus marmoratus and the white eye-bream Abramis sapa. Four other non-native species were also found within the corridor — the Amur sleeper Perccottus glenii, gibel carp Carassius gibelio, brown bullhead Ameiurus nebulosus and the topmouth gudgeon Pseudorasbora parva. Their presence is related to numerous accidental introductions to many localities in Belarus and Poland, rather than from using the corridor as an invasion route. One species, the ninespine stickleback, Pungitius pungitius, has migrated from the Baltic basin to the Black Sea drainage systems.

scholarly journals Comparison of Behavior and Space Use of the European Bullhead Cottus gobio and the Round Goby Neogobius melanostomus in a Simulated Natural Habitat

Biology ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 821
Author(s):  
Sara Roje ◽  
Bořek Drozd ◽  
Luise Richter ◽  
Jan Kubec ◽  
Zdeněk Polívka ◽  
...  
Keyword(s):  
Native Species ◽  
Natural Habitat ◽  
Activity Patterns ◽  
Habitat Preferences ◽  
Round Goby ◽  
Space Use ◽  
Neogobius Melanostomus ◽  
Invasion Success ◽  
Low Velocity ◽  
Cottus Gobio

The round goby is an invasive fish in Europe and North America that threatens native species by predation and competition. Its habitat preferences are similar to those of the European bullhead, which it displaces from shelters and out-competes for available resources. We assessed the microhabitat preferences, shelter use, and activity of the round goby and European bullhead in single-species experiments in habitat simulator systems to investigate their behavior in a novel environment. Fish were video-recorded for 28 h in the presence of shelter and feed with water velocity ranging from 0.00 to 0.96 m s−1. The two species showed similar behavior under given conditions. A primary difference was in stress-induced behavior in the initial phases of observation. The round goby spent more time in movement when outside the shelter and a longer time in the escape zone in the exploration period during light. Our results confirmed a significant preference of round goby for low velocity areas and a preference for higher velocities in the European bullhead. Both species were able to cope with velocities > 0.7 m s−1. Therefore, the reported invasion success of round goby is probably not driven by space use or activity patterns, but rather by higher adaptability.

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