Selective effects of small barriers on river‐resident fish

Jones, Peter E.; Champneys, T.; Vevers, Jessica; Börger, Luca; Svendsen, Jon Christian; Consuegra, Sofía; Jones, Joshua; Leániz, Carlos García de

doi:10.1111/1365-2664.13875

Cited by 47 publications

(40 citation statements)

References 87 publications

(142 reference statements)

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“…Across all 72 fish that attempted passage, shelter departure latency was retained in the best candidate passage success model for all fish, suggesting that bolder individuals (i.e., those that left the shelter quicker) had a greater probability of succeeding in passage than shyer fish. This supports the predictions of Hirsch et al (2017) and findings of Jones et al (2021), but contrasts with the findings reported by Landsman et al (2017) who showed no relationship between boldness and passage success. However, when reducing the sample size to only those that had left the shelter and thus included in the PCA to obtain behavioral trait dimensions, then Boldness btd was not retained by any candidate passage success model.…”

Section: F I G U R Esupporting

confidence: 75%

“…( 2017 ) and findings of Jones et al. ( 2021 ), but contrasts with the findings reported by Landsman et al. ( 2017 ) who showed no relationship between boldness and passage success.…”

Section: Discussioncontrasting

confidence: 51%

“…In northern temperate zones, river fragmentation has heavily impacted on brown trout populations. This is largely a result of size‐related passage ability and selectivity by barriers to migration whereby larger individuals are more likely to succeed in passing upstream of an obstacle (Jones et al., 2021; Lothian et al., 2020; Noonan et al., 2012). Given that the reproductive component of a population can stem from any of the phenotypes which can be classified into discrete size groupings (Birnie‐Gauvin et al., 2019; Ferguson et al., 2019), smaller phenotypes can be severely curtailed in their migratory range, potentially being denied access to suitable spawning grounds.…”

Section: Introductionmentioning

confidence: 99%

“…If this were to be the case, where bold individuals are more likely to succeed in passage of dams and weirs, then bold fish might gain an evolutionary advantage over shy fish, particularly if habitat upstream of the dam increases overall fitness. Recent laboratory experiments in an artificial flume-cascade simulating barrier passage appear to support this hypothesis, showing that boldness is positively related to upstream passage rate for brown trout (Salmo trutta; Jones et al, 2021). However, Landsman et al (2017) failed to identify any relationship between an individual's boldness and the probability of passage success at a nature-like bypass for rainbow smelt (Osmerus mordax) in an in situ study.…”

Section: Introductionmentioning

confidence: 99%

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The role of individual behavioral traits on fishway passage attempt behavior

Lothian

Lucas

2021

Ecology and Evolution

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Variations in behavioral traits are widely recognized to drive animal behaviors exhibited within a population. However, information on how behavior traits influence behavior in anthropogenically modified habitats is lacking. Many habitats have become highly fragmented as a result of human processes. To mitigate this and improve habitat connectivity, wildlife passes are increasingly employed, with the aim of enabling animals to move freely between habitats. However, wildlife passes (e.g., fishways) are not always effective in achieving passage and it remains uncertain what factors play a role in an individual's likelihood of passing successfully. This study measured three behavioral traits (boldness, exploration, and activity) in juvenile brown trout (Salmo trutta; n = 78) under field conditions within a river and tested whether these behavior traits influenced both the passage success and the behaviors exhibited during upstream fishway passage attempts. Although behavioral traits were found and collapsed into two behavioral trait dimensions, behavioral traits had low repeatability and so did not contribute to a personality spectrum. Boldness was found to negatively influence the number of passage attempts carried out by an individual and to positively influence passage success, with bolder individuals carrying out fewer attempts and having an increased probability of passage success. No behavioral traits were found to be related to other passage metrics (passage success, Time until First Attempt, and Passage Duration) during the first passage. But all three behavioral traits were significantly negatively related to the changes in passage behaviors at consecutive, successful passage attempts, with bolder, more exploratory and more active individuals passing through a fishway quicker on the second passage than on the first. This study suggests that bolder and more active individuals may perform better during fishway passage attempts, particularly within rivers where multiple barriers to movement exist.

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Section: F I G U R Esupporting

confidence: 75%

“…( 2017 ) and findings of Jones et al. ( 2021 ), but contrasts with the findings reported by Landsman et al. ( 2017 ) who showed no relationship between boldness and passage success.…”

Section: Discussioncontrasting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The role of individual behavioral traits on fishway passage attempt behavior

Lothian

Lucas

2021

Ecology and Evolution

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“…This may involve making people more aware of the impacts of salmonid invasions and passing more stringent legislation. Exclusion barriers could also be deployed around galaxiid refugia to reduce the risk of salmonid invasions (Jones et al 2021b), but care must be taken to ensure this does not impact on native galaxiids, which may pose a challenge as even small barriers can have negative impacts on weak swimmers (Jones et al 2021a). Brown trout is subject to a bag limit and a strict fishing season and it might be useful to consider lifting these restrictions in some places to slow down the invasion front.…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

Conservation of endangered galaxiid fishes in the Falkland Islands requires urgent action on invasive brown trout

Jones

et al. 2021

Preprint

Self Cite

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Non-native salmonids are protected in the Southern hemisphere where they sustain aquaculture and valuable sport fisheries, but also impact on native galaxiid fishes, which poses a conservation conundrum. Legal protection and human-assisted secondary releases may have helped salmonids to spread, but this has seldom been tested. We reconstructed the introduction of brown trout (Salmo trutta) to the Falkland Islands using historical records and modelled its dispersal. Our results indicate that establishment success was ~88%, and that dispersal was facilitated by proximity to introduction sites and density of stream-road crossings, suggesting it was human assisted. Brown trout has already invaded 54% of Falkland rivers, which are 2.9-4.5 times less likely to contain native galaxiids than uninvaded streams. Without strong containment we predict brown trout will invade nearly all suitable freshwater habitats in the Falklands within the next ~70 years, which might put native freshwater fishes at a high risk of extinction

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Bidirectional connectivity in fishways: A mitigation for impacts on fish migration of small hydropower facilities

Bravo‐Córdoba

García‐Vega

Fuentes‐Pérez

et al. 2023

Aquatic Conservation

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1. Most freshwater fish need to move freely through rivers to complete their life cycles. Thus, river barriers (e.g. dams, culverts and gauging stations) may delay, hinder or even block their longitudinal movements, affecting fish conservation.The most widespread solution to allow upstream fish migration are fishways, whereas downstream migration is basically facilitated through spillways, turbines or specific solutions such as bypass systems.2. So far, studies and scientific discussions concerning bidirectional movements through fishways are scarce and focused on large dams and reservoirs, mainly with large migratory species such as salmonids, rather than smaller facilities and lesser known species.3. This study investigated bidirectional movements through a small run-of-the-river hydropower plant with a pool-and-orifice type fishway, using the Iberian barbel (Luciobarbus bocagei), a potamodromous cyprinid, as the target species. Passive integrated transponder and radio tracking data were collected over 4 years and combined to characterize upstream and downstream movements. The study focused primarily on fish movements through the fishway, but also estimated the multiple associated routes of passage.4. The results show diverse fish movements with inter-and intra-annual variability, with several individuals performing bidirectional movements and even some fish returning over the years. The documented movements and observations indicate that fishways can serveas an effective bidirectional migration corridor for fish, potentially enhancing the conservation efforts for potamodromous species. This study supports the decision to use fishways as an overall mitigation tool to reduce the impact of small hydropower facilities on fish.

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Selective effects of small barriers on river‐resident fish

Abstract: This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Cited by 47 publications

References 87 publications

The role of individual behavioral traits on fishway passage attempt behavior

The role of individual behavioral traits on fishway passage attempt behavior

Conservation of endangered galaxiid fishes in the Falkland Islands requires urgent action on invasive brown trout

Bidirectional connectivity in fishways: A mitigation for impacts on fish migration of small hydropower facilities

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