Françoise DaveratFrench National Institute for Agriculture, Food, and Environment (INRAE) | INRAE · Department of Waters
Françoise Daverat
PhD & HDR
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Publications (80)
Abstract: A cooperative effort gathered a large European length-at-age data set (N = 45,759, Lat. 36S61N Long. 10W27E) for Anguilla anguilla, covering one century. To assess the effect of global warming during the last century and habitat effects on growth, a model was fitted on the data representing the conditions met at the distribution area scal...
European flounder Platichthys flesuslife history patterns were investigated in 3
basins along a latitudinal gradient (Minho, N Portugal; Gironde, SW France; Seine, N France). We
used coupled Sr:Ca and Ba:Ca otolith signatures and microstructure to retrospectively determine
habitats occupied by flounder during their life, including early larval onto...
The temporal asynchronies in larvae production from different spawning areas are fundamental components for ensuring stability and resilience of marine metapopulations. Such a concept, named portfolio effect, supposes that diversifying larval dispersal histories should minimize the risk of recruitment failure by increasing the probability that at l...
Using strontium (Sr) and barium (Ba) in otoliths to determine natal origins and understand patterns of fish movements is based on the fundamental assumption that otoliths record water chemistry signals without any major alterations. Although prior studies highlighted that fish physiology can modify the water signal in otoliths, studies for freshwat...
Diadromous fish have exhibited a dramatic decline since the end of the 20th century. The allis shad (Alosa alosa) population in the Gironde‐Garonne‐Dordogne (GGD) system, once considered as a reference in Europe, remains low despite a fishing ban in 2008. One hypothesis to explain this decline is that the downstream migration and growth dynamics of...
Anguillid eels were once considered to be the classic example of catadromy. However, alternative life cycles have been reported, including skipping the freshwater phase and habitat shifting
between fresh, brackish, and saltwater throughout the growth phase. There is a lack of knowledge regarding these alternate life strategies, for example, the pr...
Although otoliths are widely used as archives to infer life‐history traits and habitat use in fishes, their biomineralization process remains poorly understood. This lack of knowledge is problematic as it can lead to misinterpretation of the different types of signals (e.g., optical or chemical) that provide basic data for research in fish ecology,...
In fish, the gut microbiome plays a crucial role in homeostasis and health and is affected by several organic and inorganic environmental contaminants. Amphidromous fish are sentinel species, particularly exposed to these stressors. We used whole metagenome sequencing to characterize the gut microbiome of wild European eels (Anguilla anguilla) at a...
Many anguillid eel species display facultative catadromy. Some eel spend their entire life cycle in marine coastal areas, but the geographical extent of this, especially at the extremes of their distributional ranges, is unknown. We analysed otolith Sr:Ca and Ba:Ca from yellow-stage European eel (Anguilla anguilla) sampled along the coast of Norway...
We implement a newly developed framework, expressed as a mathematical model that we solve numerically, for understanding environmental sex determination in populations with consistent trends in abundance. Though broadly applicable, the analysis here focuses on the steadily declining North Atlantic eel populations. This enables us to show how the ec...
The structure and connectivity of European seabass (Dicentrarchus labrax) populations remain poorly known and ecological evidence is missing to support the current delineation between the northern (southern North Sea, English Channel and Celtic Sea) and southern French stocks (Bay of Biscay). Adult spawning site fidelity and natal homing were analy...
Alizarin detection in fish fins is extensively employed because it is easy to use. However, in eels, the eelGFP fluorescent protein may impede the detection of the fluorescent markers in the eel tissues. The study tests the effectiveness of three of the most up-to-date alizarin-detecting technologies on the living body and fins of European glass ee...
The global lockdowns brought on by the COVID‐19 pandemic forced an immediate change in the way people moved about; namely, travel was slowed from a turbulent river to a trickle. In‐person meetings, often involving long‐distance flights, were either canceled, postponed, or shifted over to virtual modes. People who were unfamiliar with online meeting...
The cover image is based on the Short Communication The potential contribution of small coastal streams to the conservation of declining and threatened diadromous fishes, especially the European eel by Gordon Copp et al., https://doi.org/10.1002/rra.3746.
Photography by Alan Walker.
Human-generated pressures are continuing to have a detrimental effect on diadro-mous fishes, resulting in legislative initiatives to conserve and manage these species. Field studies to inform these initiatives focus almost exclusively on larger marine, estuarine, and inland waters, neglecting the role of small coastal streams and tributaries in pop...
Application of high-throughput sequencing technologies to microsatellite genotyping (SSRseq) has been shown to remove many of the limitations of electrophoresis-based methods and to refine inference of population genetic diversity and structure. We present here a streamlined SSRseq development workflow that includes microsatellite development, mult...
Hybridization dynamics between co‐occurring species in environments where human‐mediated changes take place is important to quantify for furthering our understanding of human impacts on species evolution and for informing management. The allis shad Alosa alosa (Linnaeus, 1758) and twaite shad Alosa fallax (Lacépède, 1803), two clupeids sister speci...
The European flounder is a demersal species present along the NE-Atlantic Ocean, from Norway to Portugal, both in coastal and estuarine ecosystems (Nielsen, 1986). It is also present in the adjacent seas - Baltic, North, White, Mediterranean, and Black seas (Nielsen, 1986; Figure 5.2.2-1, Table 5.2.2-2). The species was introduced in North America...
Alosa alosa
Allis shad (Alosa alosa) mature at 3–6 years of age and migrate many hundreds of kilometres upstream into their natal river to spawn. Spawning occurs during spring in the
main river and major tributaries, in shallow waters, and over gravel substrate (Baglinière
et al., 2003). The adults usually die after spawning. Allis shad larvae hatc...
The specific stock composition and dispersion of anadromous fish species aggregations in the marine environment are poorly known, while they can play a major role in the metapopulation dynamics. Otolith microchemistry has proven to be a powerful tool to address natal origins of anadromous fish. We used archived otolith microchemistry to investigate...
Application of high-throughput sequencing technologies to microsatellite genotyping (SSRseq) has been shown to remove many of the limitations of electrophoresis-based methods and to refine inference of population genetic diversity and structure. However, early proof of concept and species specific development studies resulted in dispersed informati...
Many diadromous fishes such as salmon and eels that move between freshwater and the ocean have evolved semelparous reproductive strategies, but both groups display considerable plasticity in characteristics. Factors such as population density and growth, predation risk or reproduction cost have been found to influence timing of maturation. We inves...
Allis shad, Alosa alosa (Linnaeus, 1758) and twaite shad, Alosa fallax (Lacépède, 1803), are a complex of two sister species of anadromous Clupeidae species, with A. alosa populations facing a great decline in the 2000s. Whereas the freshwater part of the biological cycle of these species was widely addressed (mainly for A. alosa), information abou...
L’anguille européenne Anguilla anguilla est une espèce catadrome avec un cycle de vie complexe incluant des migrations entre la mer de Sargasses, l’Europe et l’Afrique du Nord. Du fait de sa baisse drastique de population depuis 30 ans, l’anguille est considérée aujourd’hui comme « en danger critique d’extinction ». Une des causes de ce déclin est...
Allis shad, Alosa alosa (Linnaeus, 1758) and twaite shad, Alosa fallax (Lacépède, 1803), are a complex of two sister species of anadromous Clupeidae species, with A. alosa populations facing a great decline in the 2000s. Whereas the freshwater part of the biological cycle of these species was widely addressed (mainly for A. alosa), information abou...
L’alose vraie, Alosa alosa (Linnaeus, 1758) et l’alose feinte, Alosa fallax (Lacépède, 1803), sont un complexe de deux espèces sœurs anadromes de Clupeidae, les populations d'alose vraie faisant face à un grand déclin dans les années 2000. Alors que la partie en eau douce du cycle biologique de ces espèces a été largement abordée (principalement po...
Similar to many diadromous fish species, dramatic declines were observed for Allis shad, an anadromous Clupeidae, since the beginning of the 2000s. The knowledge of population and metapopulation dynamics is a key issue for the management of migratory species. Although homing behaviour is dominant in Allis shad, staying causes exchanges between popu...
European eels (Anguilla anguilla) migrate between the southwestern Sargasso Sea and the European and Mediterranean coasts. In a recent paper in Current Biology, Naisbett-Jones et al. [1] claim to “provide the first evidence that they [eels] derive positional information from the Earth's magnetic field” and that this information guides their migrati...
Fishways are built on obstacles to restore the connectivity between aquatic habitats. Our study investigated how species-specific fishways interact with interindividual trait differences among fish. We compared several groups of glass eels (Anguilla anguilla) climbing two types of fishways with those remaining below the water impoundments. We analy...
Despite recent efforts to manage them more efficiently, estuaries are natural sinks for a wide range of metal contaminants, many of which accumulate at potentially toxic concentrations for fish populations, posing a threat to recruitment and stocks. While analysis of metal concentrations in soft tissue and water samples calls for continuous and lon...
https://www.crcpress.com/An-Introduction-to-Fish-Migration/Morais-Daverat/9781498718738
https://www.crcpress.com/An-Introduction-to-Fish-Migration/Morais-Daverat/9781498718738
https://www.crcpress.com/An-Introduction-to-Fish-Migration/Morais-Daverat/9781498718738
European eel (Anguilla anguilla) is a catadromous fish species that received substantial attention as its population has markedly declined in the last three decades. The possible causes of this decline include habitat fragmentation factors such as dams and weirs. In some cases, these obstacles are equipped with fish friendly passage devices that ma...
https://www.crcpress.com/An-Introduction-to-Fish-Migration/Morais-Daverat/9781498718738
Otoliths as tracers of fish migration. Analytical techniques and equipment used to infer fish migrations and movements. Collection and preparation of samples. Investigating fish migration: data treatment. Case studies.
Methods to study the migratory behaviourr of fish can be divided in two categories: capture-dependent (based on sampling marked or unmarked fish) and capture-independent methods, such as visual or video observation, resistivity fish counters or hydroacoustics. In this chapter we focus only on capture-dependent methods using marked fish.
Introduction, anadromous fishes: who are they? Why do they migrate? When do they migrate? How do they migrate? Insights on anadromous species conservation.
European eel is a panmictic species, whose decline has been recorded since the last 20 years. Among human-induced environmental factors of decline, the impact of water dams during species migration is questioned. The main issue of this study was to pinpoint phenotypic traits that predisposed glass eels to successful passage by water barriers. The a...
Physical obstacles to upstream migration such as dams are a major impairment of natural colonisation and dispersion of eels. Dams and obstacles increase the energy demand of fish, even when they are equipped with fish friendly devices. Besides, local accumulation of eels below dams increase the mortality associated with predation. Obstacles may als...
Understanding dispersal capacities for migratory species is crucial for their management. By coupling otolith microchemistry and microsatellite genetic analyses, we provided information on snapshot and long-term dispersal capacity of Allis shad (Alosa alosa), an anadromous clupeid in decline throughout its distribution range. The allocation of nata...
Abstract European flounder (Platichthys flesus) is generally considered to be a marine euryhaline species. Most existing studies have focused on the brackish part of its life cycle. This is the first time that acoustic telemetry has been used to study the movements, home range, and habitat use of late-stage juvenile flounders (2 +, 3 +) in a freshw...
Anguilla anguilla, A. japonica and A. rostrata are three largely distributed catadromous and semelparous species characterized by a long and passive oceanic larval drift between their marine spawning grounds and their nursery areas in continental waters. Their large and spatially heterogeneous environments combined with population panmixia and long...
144th Annual Meeting of the American Fisheries Society EvEel: A Model to Explore the Role of Phenotypic Plasticity as an Adaptive Response of Three Temperate Eels (Anguilla anguilla, A. japonica and A. rostrata) to Spatially Structured Environments
During watershed colonisation by catadromous species, two main phases have been identified: tidal estuary crossing and non-tidal river colonisa-tion. Fishes use selective tidal-stream transport (STST) during the first phase of this colonisation, and counter-current swimming during the sec-ond phase. Therefore, catadromous species have to achieve a...
Although the average growth rate of European eel is known to be generally dependent on temperature and habitat at the population scale, large variation in growth among eels in a single river basin can also be widely observed. In this study, individual growth trajectories of female European eels in the Gironde River basin, France, were modeled with...
Otolith elemental (Sr:Ca, Ba:Ca, Mn:Ca, Mg:Ca and Rb:Ca) and isotopic ((87) Sr:(86) Sr) profiles from several annual cohorts of juvenile Atlantic salmon Salmo salar were related to the physico-chemical characteristics (chemical signatures, flow rate, temperature and conductivity) of their natal rivers over an annual hydrological cycle. Only Sr:Ca,...
We investigated the use of Sr:Ca, Ba:Ca, and 87Sr:86Sr ratios as natural tags for determining the natal origins of juvenile and adult Atlantic salmon (Salmo salar) from 12 tributaries in the Adour basin (southwestern France) and estimated homing on a tributary scale. Geochemical signatures from core regions of the otolith were also used to identify...
Aiming at increasing the resolution of otolith tracers, we investigated the possibility to use Mn, Co, Zn, Rb, Cd, Sn, Ba, Sr, and Pb otolith composition to retrieve the movements of eels (Anguilla anguilla) in the lower Gironde watershed. Caging experiments were designed to validate the site specific otolith signatures. Individually identified eel...
A new realization of the variation in continental habitat shift patterns of anguillid eels has been made possible by otolith microchemistry research. However, it is still unclear how habitat shifts of eels occur between freshwater and saline habitats and how they affect their continental life history. In this study, we investigated the effect of ha...
We conducted a laboratory experiment to validate the relationship between the otolith strontium/calcium (Sr/Ca) ratio of Japanese
eels (Anguilla japonica) and water Sr/Ca ratio when the ratio in water was changed. A linear and additive mixed modeling approach was used to assess
otolith Sr/Ca ratio for elver-juvenile Japanese eels when ambient water...
This study combines otolith trace element and genetic analyses to explore the origin of individuals when hatchery-reared fish are released into wild populations. We sampled 90 juvenile Atlantic salmon (Salmo salar) in four rivers in Normandy (France) and in the hatchery stock. Individuals were analyzed at six microsatellite markers and their otolit...
Daverat F, Martin J, Fablet R, Pécheyran C. Colonisation tactics of three temperate catadromous species, eel Anguilla anguilla, mullet Liza ramada and flounder Plathychtys flesus, revealed by Bayesian multielemental otolith microchemistry approach. Ecology of Freshwater Fish 2011: 20: 42–51. © 2010 John Wiley & Sons A/S
Abstract – The colonisation...
Martin J, Daverat F, Pécheyran C, Als TD, Feunteun E, Réveillac E. An otolith microchemistry study of possible relationships between the origins of leptocephali of European eels in the Sargasso Sea and the continental destinations and relative migration success of glass eels.
Ecology of Freshwater Fish 2010: 19: 627–637. © 2010 John Wiley & Sons A/...
The reconstruction of individual life histories from chemical otolith measures is stated as an unsupervised signal-processing issue embedded in a Bayesian framework. This computational methodology was applied to a set of 192 European eel (Anguilla anguilla) otoliths. It provided a robust and unsupervised analysis of the individual chronologies of h...
Habitat use patterns of 3 species of temperate eels, Anguilla anguilla, A. japonica and A. rostrata, were investigated using otolith strontium:calcium ratio life history transects. Published and unpublished data from 6 sites (Canada, United States, Sweden, France, Taiwan and Japan) sam- pled across the geographical range of each eel species were co...