Audrey M Darnaude

Audrey M Darnaude
French National Centre for Scientific Research | CNRS · Institut écologie et environnement (INEE)

PhD (& HDR)

About

80
Publications
18,769
Reads
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1,857
Citations
Citations since 2017
36 Research Items
988 Citations
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2017201820192020202120222023050100150
2017201820192020202120222023050100150
Introduction
Although I'm specialized in fish ecology, I have investigated the biology and lifetime behaviour of varied marine species, mainly through the use of individual biogeochemical markers (e.g. stable isotope analysis and otolithometry). Besides chairing the CA19107 COST action on Marine Connectivity, I currently study the life history and population structure of various fish of high economic value, in link with food web functioning and connectivity in the ocean and at the sea-continent interface.
Additional affiliations
January 2015 - present
French National Centre for Scientific Research
Position
  • Research Associate
January 2006 - December 2014
French National Centre for Scientific Research
Position
  • Research Associate
January 2004 - December 2005
Centre for Environment, Fisheries and Aquaculture Science
Position
  • PostDoc Position

Publications

Publications (80)
Article
Reliable assessment of fish origin is of critical importance for exploited species, since nursery areas must be identified and protected to maintain recruitment to the adult stock. During the last two decades, otolith chemical signatures (or "fingerprints") have been increasingly used as tools to discriminate between coastal habitats. However, corr...
Article
The construction of marinas along the shoreline has caused substantial habitat destruction within the sheltered coastal areas previously used as nursery grounds by many fish species. However, although the negative ecological impacts of these constructions have been reported extensively, their potential roles in the functioning of the coastal zone r...
Article
Full-text available
ABSTRACT: The oxygen isotopic ratio of fish otoliths is increasingly used as a ‘natural tag’ to assess provenance in migratory species, with the assumption that variations in δ18O values closely reflect individual ambient experience of temperature and/or salinity. We employed archival tag data and otoliths collected from a shelf-scale study of the...
Article
Full-text available
Understanding the genetic underpinnings of fitness trade-offs across spatially variable environments remains a major challenge in evolutionary biology. In Mediterranean gilthead sea bream, first-year juveniles use various marine and brackish lagoon nursery habitats characterized by a trade-off between food availability and environmental disturbance...
Article
Full-text available
Truly sustainable development in a human-altered, fragmented marine environment subject to unprecedented climate change, demands informed planning strategies in order to be successful. Beyond a simple understanding of the distribution of marine species, data describing how variations in spatio-temporal dynamics impact ecosystem functioning and the...
Article
In this study, we investigated the size-at-age structure and growth of the horse-eye jack (Caranx latus), a highly mobile neritic species with significant commercial value in many parts of the tropical southwest Atlantic. For this, we combined size (standard length – SL) data and otolith readings from 282 juvenile and adult specimens of the species...
Article
Coastal lagoons are known to host numerous resident and migrant fish species. Spatio-temporal variation in abiotic and biotic conditions in these ecosystems results, however, in a mosaic of microhabitats that could differently affect juvenile growth and survival. To deepen our understanding of juvenile fish habitat requirements and their spatio-tem...
Article
The European COST Action “Unifying Approaches to Marine Connectivity for improved Resource Management for the Seas” (SEA-UNICORN, 2020‐2025) is an international research coordination initiative that unites an interdisciplinary community of scientists and policymakers from over 100 organizations across Europe and beyond. It is establishing a globall...
Article
Full-text available
Truly sustainable development in a human-altered, fragmented marine environment subject to unprecedented climate change, demands informed planning strategies in order to be successful. Beyond a simple understanding of the distribution of marine species, data describing how variations in spatio-temporal dynamics impact ecosystem functioning and the...
Article
Yellowfin tuna (Thunnus albacares) is a highly exploited species in the Indian Ocean. Yet, their stock structure is still not well understood, hindering to assess the stock at a suitable spatial scale for management. Here, young-of-the-year (<4 months) yellowfin tuna otoliths were collected in 2018 and 2019, from four major nursery areas in the Ind...
Article
Full-text available
Yellowfin tuna of the Indian Ocean is overfished, and a better understanding of the stock structure is needed to enable sustainable management. Here, otolith δ18O values of young-of-the-year fish from known nursery areas of the equatorial Indian Ocean (West, Central and East) were used to establish a reference isotopic signature to predict the orig...
Article
Recurrent jellyfish blooms in the coastal zone call for understanding the impacts of jelly-falls on the functioning of benthic communities, especially in shallow enclosed ecosystems where their biomass can affect local carbon cycling and productivity. Each year, blooms of the jellyfish Aurelia coerulea appear and collapse in a semi-enclosed coastal...
Article
Sharks exhibit varied demographic strategies depending on both the species and the population location, which make them more or less vulnerable to fishing. Accurate evaluation of local age and growth parameters is therefore fundamental for the sustainable management of their stocks. Although demographic parameters have been assessed for bull shark...
Article
Jacks are highly prized tropical marine fish. Most of them complete their whole life cycle at sea but some use estuaries at the juvenile stage before moving back to coastal waters and joining the adult exploited stocks. Little is known about jacks’ trophic ecology in estuaries, although their juveniles' ability to successfully exploit available res...
Article
Full-text available
The chemical composition of otoliths (earbones) can provide valuable information about stock structure and connectivity patterns among marine fish. For that, chemical signatures must be sufficiently distinct to allow accurate classification of an unknown fish to their area of origin. Here we have examined the suitability of otolith microchemistry a...
Article
Full-text available
The current lack of knowledge on the trophic ecology of scyphozoans, particularly at the benthic stage, prevents a full understanding of the controls on many jellyfish blooms. The blooming scyphozoan (Aurelia coerulea) completes its entire life cycle in the Thau lagoon (southern France), where the annual population dynamics of both its benthic and...
Article
Full-text available
Partial migration, where migrant and resident organisms coexist within the same population, has been found in many fishes. Although it seems obvious that different life cycles exploit habitats and food webs differently, few assessments about the trophic consequences of partial migration are available. To unveil part of this complexity, we combined...
Article
Connectivity between spawning and nursery grounds influences the colonization, replenishment and resilience of populations of marine organisms. Connectivity rate, measured as the exchange of individuals between spawning and nursery grounds, is therefore a crucial determinant of stock size. However, connectivity of early-life stages is hard to explo...
Conference Paper
Full-text available
Understanding the local connectivity patterns responsible for the genetic structure of exploited stocks is essential for the sustainable management of fish resources. Yet, this knowledge is still lacking for many target species and parts of the world. For example, little is known about the spawning sites of the gilthead sea bream (Sparus aurata) in...
Article
To investigate dispersal and connectivity between spawning and lagoon nursery habitats of the gilthead seabream, Sparus aurata, in the Gulf of Lions (northwestern Mediterranean Sea), we modeled the potential transport of the species' larvae between its supposed main spawning site in the region (the Planier Island) and two of its main local nursery...
Article
Until recently, jellyfish have been ignored as an important source of food, due to their low nutritional value. Here, quantitative PCR was used to detect and quantify the DNA of the jellyfish Aurelia coerulea in the gut contents of commercially important fish species from the Thau Lagoon. Individuals from five fish species were collected during two...
Article
Full-text available
Partial migration is a key adaptive strategy, increasingly observed across multiple taxa. To investigate partial migration and life-cycle diversity of Merluccius australis in northwestern Patagonia, we analysed isotopic (d 13 C, d 18 O) and elemental (11 B, 23 Na, 24 Mg, 55 Mn, 86 Sr, 138 Ba) compositions of otoliths from juveniles, sub-adults, and...
Conference Paper
Full-text available
Effective management of fish resources requires a good knowledge of the local connectivity patterns responsible for the genetic structure of the exploited stocks, especially for species with a life cycle that involves migration at varied life stages. Yet, this information is still lacking for many target species and parts of the world. In the Gulf...
Article
Full-text available
For many jellyfish, the magnitude and timing of medusae blooms are recognized to result from the benthic stage dynamics. However, information on the scyphistomae of jellyfish populations in the wild remains scarce. Here, bi-mensual underwater photoquadrat surveys were combined with scyphistomae sampling and observation to describe the annual (Febru...
Article
• In the Amazon, migratory catfishes of the genus Brachyplatystoma are apex predators that are important for fisheries and conservation. The life cycle of Brachyplatystoma platynemum Boulenger, 1898 is poorly known, although it has been hypothesized to be very similar to that of Brachyplatystoma rousseauxii Castelnau, 1855, which uses the entire le...
Conference Paper
Full-text available
In coastal fishes with complex life histories, who typically inhabit different habitats during their lifespan and experience multiple environments at certain life stages (e.g. juvenile), studying the link between habitat diversity and fish lifetime condition and growth is essential. Indeed, carry-over effects (COEs) between life stages can play a k...
Article
Full-text available
Partial migration is a key adaptive strategy, increasingly observed across multiple taxa. To investigate partial migration and life-cycle diversity of Merluccius australis in northwestern Patagonia, we analysed isotopic (d13C, d18O) and elemental (11B, 23Na, 24 Mg, 55Mn, 86Sr, 138Ba) compositions of otoliths from juveniles, sub-adults, and adults t...
Article
Full-text available
Accurate information on the growth rates of fish is crucial for fisheries stock assessment and management. Empirical life history parameters (von Bertalanffy growth) are widely fitted to cross-sectional size-at-age data sampled from fish populations. This method often assumes that environmental factors affecting growth remain constant over time. Th...
Data
Four linear mixed effects models, each with a differing temperature variable. (DOCX)
Data
Dissolved oxygen concentrations and surface water temperatures of the four major coastal lagoons in the Gulf of Lions; Salses-Leucate (Salses), Bages-Sigean (Bages), Thau and Mauguio, for the years 2002–2012. (TIFF)
Data
Linear relationship between the logged total fish weight (g) and the logged age (in months) in Sparus aurata. The linear model was calculated to be log(weight) = 1.18 + 1.32*(log(age)), where weight in measured in grams and age in months. Otolith radius refers to the dorsal axis radius measure of the otolith (Z4 in Fig 3). R2 = 0.78, p < 0.001. (TI...
Poster
Sustainable management of marine fish resources requires a good knowledge of their local population structure and lifetime migrations. Yet this basic information is still lacking for many target species, especially with regards the number and location of the spawning grounds and their respective contribution to juvenile and adult sub-populations. T...
Article
Full-text available
High abundances of juvenile fish in certain ports suggest they might provide alternative nursery habitats for several species. To further investigate this possibility, post-settlement growth, metal uptake and body condition were estimated in 127 juveniles of two seabream species, collected in 2014-15, inside and outside the highly polluted ports of...
Article
Full-text available
Accurate knowledge on fish trophic ecology and its modifications is crucial for understanding the impact of global change on ecosystems. In this context, we investigated the value of the δ¹³C and δ¹⁵N of otolith soluble organic matter (SOM) for identifying temporal diet shifts in American Silver Perch (Bairdiella chrysoura) over a 30-years period c...
Article
Full-text available
Elemental analysis of biological calcified structures (e.g. fish otoliths, mollusc shelves, coral skeletons or fish and shark bones) provides invaluable information regarding ecological processes for many aquatic species. Despite this importance, the reduction of the raw data obtained through Laser-ablation Inductively Coupled Plasma Mass Spectrome...
Article
This study investigated the contributions of five putative nursery areas, namely four coastal lagoons and the marine coastal zone, to the local offshore fishery of the gilthead sea bream Sparus aurata, in the Gulf of Lion (NW Mediterranean). A detailed database of multi-elemental lagoon and marine otolith signatures was developed, based upon analys...
Article
Full-text available
In marine fishes, the extent to which spatial patterns induced by selection remain stable across generations remains largely unknown. In the gilthead sea bream Sparus aurata, polymorphisms in the growth hormone (GH) and prolactin (Prl) genes can display high levels of differentiation between marine and lagoon habitats. These genotype-environment as...
Article
Full-text available
Background Mixture models (MM) can be used to describe mixed stocks considering three sets of parameters: the total number of contributing sources, their chemical baseline signatures and their mixing proportions. When all nursery sources have been previously identified and sampled for juvenile fish to produce baseline nursery-signatures, mixing pro...
Data
Full-text available
Appendix 3. Main analyses (R script in pdf format).
Article
Full-text available
Background. Otolith microchemistry applications of finite mixture distribution models (FMDM) describe mixed stocks using three sets of parameters: proportional contributions (pi), baseline parameters (θi) and number of contributing nursery origins (c#). Under ideal scenarios, c# is known and all potential sources are sampled to produce source-based...
Article
Background. Otolith microchemistry applications of finite mixture distribution models (FMDM) describe mixed stocks using three sets of parameters: proportional contributions (pi), baseline parameters (θi) and number of contributing nursery origins (c#). Under ideal scenarios, c# is known and all potential sources are sampled to produce source-based...
Article
Full-text available
Knowledge of fish migration is a prerequisite to sustainable fisheries management and preservation, especially in large international river basins. In particular, understanding whether a migratory lifestyle is compulsory or facultative, and whether adults home to their natal geographic area is paramount to fully appraise disruptions of longitudinal...
Conference Paper
Full-text available
El dorado, Brachyplatystoma rousseauxii, realiza la migración más larga conocida en aguas dulces, desde las zonas de reproducción en el piedemonte andino hasta la zona de crianza en el estuario del Amazonas, situado a más de 4000 km río abajo. Además de tener un ciclo de vida excepcional, este gran siluriforme depredador es también una de las espec...
Article
Full-text available
Temperate coastal lagoons are considered key habitats for several highly prized marine fishes, which colonise them as nurseries. Lagoons can, however, exhibit diverse abiotic and biotic conditions, with potential consequences for their quality as habitats. To investigate this, we compared size, body condition (Fulton’s condition factor K and lipid...
Article
Oxygen isotope ratios from fish otoliths are used to discriminate marine stocks and reconstruct past climate, assuming that variations in otolith d 18 O values closely reflect differences in temperature history of fish when accounting for salinity induced variability in water d 18 O. To investigate this, we exploited the environmental and migratory...
Article
Full-text available
Oxygen isotope ratios from fish otoliths are used to discriminate marine stocks and reconstruct past climate, assuming that variations in otolith δ18O values closely reflect differences in temperature history of fish when accounting for salinity induced variability in water δ18O. To investigate this, we exploited the environmental and migratory dat...
Article
Coastal and estuarine nursery grounds are essential habitats for sustaining flatfish stocks since only these shallow and productive areas provide the high food supply that allows maximizing juvenile growth and survival in most flatfish species. However, the main organic matter sources at the basis of benthic food webs might differ drastically betwe...
Article
Full-text available
Otolith microchemistry can provide valuable information about stock structure and mixing patterns when the magnitude of environmental differences among areas is greater than the cumulative influence of any vital effects. Here, the current understanding of the underlying mechanisms governing element incorporation into the otolith is reviewed. Hard a...
Article
Full-text available
European eel Anguilla anguilla migratory behaviour during continental life is still unclear due to the multiplicity of aquatic environments colonised by the species. In the Camargue area (NW Mediterranean), eel colonisation of the Fumemorte canal, a freshwater habitat that communicates only with a vast brackish ecosystem (the Vaccares lagoon), offe...
Article
Full-text available
Precise knowledge of lifetime migrations is vital in exploited fish species, since all essential habitats must be protected to maintain sustainable stock levels. The present study used multi-element otolith fingerprints of the gilthead sea bream Sparus aurata (L.) to discriminate its main juvenile and adult habitats in the Languedoc-Roussillon regi...
Article
Full-text available
Abiotic and biotic variables of coastal lagoons are highly heterogeneous in both space and time, and this heterogeneity complicates the assessment of their ecological status. These variables are essential to the monitoring and preservation of these fragile ecotones and the resources and services they sustain. An integrative approach for evaluating...
Article
Les sources de matières organiques, à la base des réseaux trophiques des juvéniles de poissons plats, diffèrent selon le système hydrique considéré. Au sein des nourriceries estuariennes, le réseau trophique repose principalement sur la matière organique particulaire d'origine terrigène. En revanche, dans les zones non estuariennes et notamment les...
Conference Paper
Full-text available
Recent field studies of commercially exploited marine fish stocks have demonstrated compelling evidence of complex population structure and varying rates of exchange between different management areas. In spite of this, the stock assessment methods currently applied by ICES to advise on total allowable catches (TACs) and technical conservation meas...
Technical Report
Full-text available
Deliverable 4 focuses on discussions around the migration studies on Mugil cephalus, mainly concerning the application of otolith chemistry. WS3 has defined guidelines for studies on migration using otolith microchemistry in order to follow standard protocols.
Article
Full-text available
Summary • To investigate the role of fish ecology in controlling terrestrial particulate organic matter (POM) uptake by benthic fish species and population responses to changes in continental inputs to coastal areas, depth distribution, diet and stable isotope (13C and 15N) data from the juveniles and adults of five important flatfish species (Ar...
Article
Full-text available
Carbon and nitrogen stable isotopes were used to study depth variation in terrestrial particulate organic matter (POM) sedimentation off the mouth of the Rhone River delta, and its use by the main benthic invertebrates (polychaetes, crustaceans, molluscs and echinoderms) and flatfishes (Arnoglossus laterna, Buglossidium luteum and Solea solea). Coa...
Article
Full-text available
The link between climate-driven river runoff and sole fishery yields observed in the Gulf of Lions (NW Mediterranean) was analysed using carbon- and nitrogen stable isotopes along the flatfish food webs. Off the Rhone River, the main terrestrial (river POM) and marine (seawater POM) sources of carbon differed in δ13C (–26.11‰ and −22.36‰, respectiv...
Conference Paper
Terrestrial particulate organic matter (POM) plays a major role in the functioning of marine coastal ecosystems, particularly in areas submitted to large river runoff. In the Gulf of Lions (NW Mediterranean), stable isotope analyses demonstrate that the terrestrial POM carried by the Rhone river is directly incorporated into marine coastal food web...