Migration delays and mortality of adult Atlantic salmon Salmo salar en route to spawning grounds on the River Allier, France

Baisez, Aurore; Bach, Jean-Michel; Leon, Cédric; Parouty, Thimothé; Terrade, Renaud; Hoffmann, Marion; Laffaille, Pascal

doi:10.3354/esr00384

Cited by 40 publications

(36 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Already, a variety of coldwater riverine fish are exhibiting evidence of climate change impacts. For example, Baisez et al (2011) documented significant delays and mortality associated with high river temperatures for upstream migrating Atlantic salmon. Walter et al (2012) advocate research efforts to identify the hydrological conditions necessary to positively impact fish recruitment under future climate conditions.…”

Section: Predicting Responses Of River Fish and River Ecosystems To Bmentioning

confidence: 99%

Endangered river fish: factors hindering conservation and restoration

Cooke¹,

Paukert²,

Hogan³

2012

Endang. Species. Res.

166

119

View full text Add to dashboard Cite

Globally, riverine fish face many anthropogenic threats including riparian and flood plain habitat degradation, altered hydrology, migration barriers, fisheries exploitation, environmental (climate) change, and introduction of invasive species. Collectively, these threats have made riverine fishes some of the most threatened taxa on the planet. Although much effort has been devoted to identifying the threats faced by river fish, there has been less effort devoted to identifying the factors that may hinder our ability to conserve and restore river fish populations and their watersheds. Therefore, we focus our efforts on identifying and discussing 10 general factors (can also be viewed as research and implementation needs) that constrain or hinder effective conservation action for endangered river fish: (1) limited basic natural history information; (2) limited appreciation for the scale/extent of migrations and the level of connectivity needed to sustain populations; (3) limited understanding of fish/river-flow relationships; (4) limited understanding of the seasonal aspects of river fish biology, particularly during winter and/or wet seasons; (5) challenges in predicting the response of river fish and river ecosystems to both environmental change and various restoration or management actions; (6) limited understanding of the ecosystem services provided by river fish; (7) the inherent difficulty in studying river fish; (8) limited understanding of the human dimension of river fish conservation and management; (9) limitations of single species approaches that often fail to address the broader-scale problems; and (10) limited effectiveness of governance structures that address endangered river fish populations and rivers that cross multiple jurisdictions. We suggest that these issues may need to be addressed to help protect, restore, or conserve river fish globally, particularly those that are endangered.

show abstract

Section: Predicting Responses Of River Fish and River Ecosystems To Bmentioning

confidence: 99%

Endangered river fish: factors hindering conservation and restoration

Cooke¹,

Paukert²,

Hogan³

2012

Endang. Species. Res.

166

119

View full text Add to dashboard Cite

show abstract

“…Higher mortality is caused by enhanced predation in impoundments and by hydropower turbine passage during downstream migration (Brevé et al, ; Calles, Rivinoja, & Greenberg, ; Jepsen et al, ; Wilkes, Mckenzie, & Webb, ). In addition, it takes time to pass through a fish passage (Baisez et al, ; Croze, Bau, & Delmouly, ). As such, fish passages need to be designed in such a way that they ensure minimal passage delay and have little to no postpassage impacts (Silva et al, ).…”

Section: Introductionmentioning

confidence: 99%

Species and river specific effects of river fragmentation on European anadromous fish species

Puijenbroek

Buijse

Kraak

et al. 2018

River Research & Apps

104

View full text Add to dashboard Cite

Fragmentation is one of the major threats to riverine ecosystems and this is most explicitly expressed by the decline in numbers of migratory fish species. Yet each species has different migration requirements and their natural distribution can include several catchments with multiple dams. Hence, to prioritize candidate rivers for improving accessibility, differences between species and between catchments have to be taken into account. The aim of this study was therefore to analyse the species and river specific effects of river fragmentation on migratory fish on a European scale. The effect of river damming on migratory fish was quantified for all 16 European long‐ and mid‐distance anadromous species and for 33 large European rivers. The historical distribution was compared with the current upstream accessibility of the main river and the current distribution and population status of each species. The observed effects of reduced connectivity were further quantified using the Dendritic Connectivity Index for species and the Fragmentation Index for rivers. Our results showed that only very few rivers are still unaffected by dams in the main stem and that the few remaining viable migratory fish populations in Europe occur in these accessible rivers. Barriers were prioritized for making passable based on the potential accessibility gain and the number of benefitting species, showing that the main stems of the rivers Shannon and Nemunas are the best candidates. It was concluded that evaluating species and river specific effects of fragmentation strongly aids in prioritizing rivers for improving upstream accessibility.

show abstract

“…This point is of special importance for management purpose as the potential spawners suffer higher mortality prior to spawning in this section (Baisez et al. ), which is also less suitable for juvenile production (Minster & Bomassi ).…”

Section: Discussionmentioning

confidence: 99%

“…The redd:potential spawner ratio k t,i aggregates several processes/factors. It includes mortality of adults returning in each river section before they can spawn (Baisez et al 2011), the spawners sex ratio, the number of redds dug by each female and the number of redds counted for each redd actually dug. All these processes/factors might be trended over time, but there is no indication of such oriented changes in our case.…”

Section: Discussionmentioning

confidence: 99%

Estimating spatial distribution of Atlantic salmon escapement using redd counts despite changes over time in counting procedure: application to the Allier River population

Dauphin

Brugel²,

Hoffmann-Legrand³

et al. 2013

Ecology of Freshwater Fish

View full text Add to dashboard Cite

In salmonid species, such as Atlantic salmon (Salmo salar L.), the most frequent type of data set available related to adult escapements are redd counts. When collected over a broad spatio‐temporal domain, redd counts data are of great interest for tracking the variation through time of the spatial distribution of the potential spawners. This is important for management purposes when the habitat quality is variable across river sections of a catchment or when the spatial distribution can vary depending on management actions or on environmental factors. However, long‐term data sets are prone to changes in data collection methodology. In this article, we present a new hierarchical Bayesian modelling approach that allows both (i) to account for a change in the data collection procedure and (ii) to analyse the variation through time of the potential spawners’ spatial distribution. The value of the proposed approach is demonstrated by its application to the Atlantic salmon redd counts data collected in Allier (France) catchment from 1977 to 2011. The Allier can be divided into three main sections according to management and habitat considerations, and an important change occurred in the redd data collection in 1997: counts by foot or by boat were replaced by counts from a helicopter. A significant effect of this change on methodology is detected: less redds counted when using the helicopter counts. However, its explicit consideration in the modelling makes little difference with regard to the estimates of potential spawner abundance and their associated uncertainty.

show abstract

Migration delays and mortality of adult Atlantic salmon Salmo salar en route to spawning grounds on the River Allier, France

Cited by 40 publications

References 28 publications

Endangered river fish: factors hindering conservation and restoration

Endangered river fish: factors hindering conservation and restoration

Species and river specific effects of river fragmentation on European anadromous fish species

Estimating spatial distribution of Atlantic salmon escapement using redd counts despite changes over time in counting procedure: application to the Allier River population

Contact Info

Product

Resources

About