Nils Teichert

Nils Teichert
Muséum National d'Histoire Naturelle · Station Marine de DInard

PhD

About

69
Publications
16,028
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770
Citations
Introduction
My research aims to acquire knowledge on ecological processes, in order to respond to issues of biodiversity management and resource preservation. More specifically, I conduct experimental and modeling approaches to investigate the responses of aquatic organisms and fish assemblages to environmental changes (natural and anthropogenic).
Additional affiliations
September 2018 - present
Muséum National d'Histoire Naturelle
Position
  • PostDoc Position
January 2015 - August 2018
Irstea
Position
  • PostDoc Position
November 2012 - December 2014
L'ARDA - Assosication Réunionnaise de Développement de l'Aquaculture
L'ARDA - Assosication Réunionnaise de Développement de l'Aquaculture
Position
  • PostDoc Position

Publications

Publications (69)
Article
Despite the importance of estuarine nurseries in the regulation of many fish stocks, temporal and spatial movements and habitat use patterns of juvenile fish remain poorly understood. Overall, combining several movement metrics allowed us to characterize dispersal patterns of juvenile flounder, Platichthys flesus, along an estuarine seascape. Speci...
Article
Full-text available
Life-history trait expression not only depends on the current environmental constraints, but also on the past ones that shaped traits expressed earlier in life. Such an effect, named carry-over, can occur in fish nursery grounds when juvenile performances after settlement are influenced by their larval traits in combination with conditions experien...
Article
In the global context of river fragmentation, predicting fish migration is urgent to implement management actions aimed at protecting and promoting the free movement of diadromous fish. However, large-scale applicability of conservation measures requires transferable models that enable prediction of migration even in data-poor regions. Here, we sur...
Article
Habitat loss and fragmentation remain major threats in estuaries, particularly with respect to the erosion of intertidal areas that provide shelter and food resources for numerous fish species. Improving our understanding of the fauna-intertidal seascape Relationship is this of critical importance. Here, the seascapes of 24 tidal estuaries were com...
Article
Full-text available
Competition arises when species share a limited resource, but this can be avoided through niche partitioning. Despite the large body of literature on diadromous fishes, very few studies have focused on niche partitioning when competing for resources. Diadromous fishes are suffering a global decline throughout their range in part due to their peculi...
Technical Report
Full-text available
L’anguille est une espèce emblématique, classée en danger critique d’extinction par l’UICN. Elle est caractérisée par un cycle biologique complexe, partagé entre le milieu marin, où se déroulent la reproduction et la phase larvaire, et les milieux aquatiques continentaux, où se déroulent la croissance et la maturation sexuelle. Les vallées estuarie...
Article
Implementation of the European Water Framework Directive in tropical areas such as the French West Indies (FWI) requires to select relevant aquatic sentinel species for investigating the ecological status of surface waters. The present work aimed to study the biological response of the widespread fish Sicydium spp. towards river chemical quality in...
Article
Amphidromous goby fry (post-larvae and young juveniles) are traditionally fished when they arrive in rivers after their larval development at sea. In Reunion Island (Indian Ocean) two species of amphidromous goby are mainly targeted by the fisheries: the endemic Cotylopus acutipinnis and the cosmopolitan Sicyopterus lagocephalus. Despite the lack o...
Technical Report
Full-text available
L’analyse des contenus stomacaux des silures sur différents sites et à différentes saisons a pour objectif de décrire la variabilité spatio-temporelle du régime alimentaire de l’espèce. Si cette approche permet d’avoir une idée précise de la diversité des taxa consommés, elle est peu intégrative et pourrait décrire un comportement de prédation oppo...
Article
Life-history traits of eels display a high level of phenotypic plasticity in response to large-scale biogeographical drivers, as well as local conditions encountered during the continental phase. Here, we provided a biogeographical snapshot of the variability of life-history traits of eels (Anguilla anguilla), across a large proportion of their nat...
Article
Full-text available
European eel is thought to be a symbol of the effects of global change on aquatic biodiversity. The species has persisted for millions of years and faced drastic environmental fluctuations thanks to its phenotypic plasticity. However, the species has recently declined to historically low levels under synergistic human pressures. Sublethal chemical...
Article
Very few tidal power plants exist in the world. The first one was built in the Rance estuary (Brittany, France) in 1966 and the second one in South Korea. However, with the increasing demand in renewable energy, other tidal power plant projects are being studied. These power plants are larger than unidirectional fluvial hydropower plants and strong...
Article
Full-text available
River fragmentation is expected to impact not only movement patterns and distribution of eels within catchment, but also their life-history traits. Here, we used otolith multi-elemental signatures to reconstruct life sequences of European silver eels within an obstructed catchment, just before the removal of hydropower dams. Beyond providing an ini...
Article
As human activities caused a dramatic decline of European eel population since the 1970s, the European Union has set targets to ensure a 40 % escapement to the sea of the silver eel biomass by considerably reducing anthropogenic impact. Thus, human obstacles to fish migration like dams and hydropower plants should enable efficient management measur...
Chapter
This chapter addresses the use of fish as indicators of environmental health. The main anthropogenic pressures impacting estuarine fishes are reviewed, as well as the main types of responses by fishes at different levels of biological organisation. Fishes have been widely used to assess estuarine health through different methodological approaches,...
Article
Full-text available
Les approches en écologie fonctionnelle ouvrent aujourd’hui de nouvelles perspectives dans le domaine du diagnostic écologique. C’est le cas par exemple du critère de la redondance fonctionnelle que les auteurs de cet article ont appliqué aux communautés de poissons pour évaluer leur sensibilité fonctionnelle à la perte d’espèces, et au-delà, mesur...
Poster
Full-text available
Amphidromous gobies post-larvae (goby fry) are traditionally fished when returning to rivers after their larval development at sea. In Reunion Island (Indian Ocean) two species, named “bichiques”, are targeted by fisheries: the endemic Cotylopus acutipinnis and the cosmopolitan Sicyopterus lagocephalus. Despite the lack of quantitative data on this...
Article
Full-text available
Developing management rules to improve downstream migration of salmon smolts in large hydropower plants is essential to limit mortality and migration delay. A 2-year telemetry study was conducted to assess the efficiency of temporary measures to enhance the safety and speed of juvenile salmon passage through the Poutès dam (Allier River, France). 1...
Article
Water warming induced by human activities can impact fish larvae survival, notably because it influences larval development and prey abundances. Amphidromous gobies of the subfamily Sicydiinae are particularly sensitive to this threat as the newly hatched free embryos are poorly developed and the first feeding opportunity only occurs after they rea...
Article
Mud crab, Scylla serrata, is a common mangrove species in the Indian Ocean. Over the last decades, fishing pressure has greatly increased especially in Madagascar. Therefore, improving the knowledge of mud crab biology and ecology is crucial to guide conservation and restoration plans. This study aimed at describing the distribution of burrows of t...
Article
Determining the relative importance of niche‐ and dispersal‐based processes in the structuring of animal communities is central in ecology. Freshwater fish and crustacean communities of small tropical islands can bring new insights for understanding these processes as all their species present a pelagic larval stage which gives them important dispe...
Technical Report
Full-text available
La présente note a pour objet de proposer une méthodologie pour identifier les périodes clés dans la gestion des espèces de bichiques de La Réunion, à partir des éléments de connaissance de biologie et d'écologie des espèces ciblées.
Technical Report
Full-text available
Le projet REZORD-MAY vise à identifier des zones de référence pour les poissons et macro-crustacés d’eau douce à Mayotte, dans un contexte général de surveillance et d’évaluation de l’état des eaux et des milieux aquatiques au titre de la DCE. Une première analyse basée sur les régions biogéographiques et la distribution des espèces le long du grad...
Article
• Changes in migration timing, resulting from the alteration in river continuity or the effect of climate change, can have major consequences on the population dynamics of diadromous fish. Forecasting the phenology of fish migration is thus critically important to implement management actions aimed at protecting fish during their migration. • In th...
Article
Post-larval prediction is important, as post-larval supply allows us to understand juvenile fish populations. No previous studies have predicted post-larval fish species richness and abundance combining molecular tools, machine learning, and past-days remotely sensed oceanic conditions (RSOCs) obtained in the days just prior to sampling at differen...
Article
Hydropower plants are commonly reported as a major cause of the worldwide decline of freshwater eels (Anguillidae), so that management solutions are urgently needed to mitigate their impacts. Where downstream passage solutions are complex to develop, turbine shutdown appears as an effective management solution to protect silver eels during their ri...
Article
Full-text available
During their ontogenetic development, many species of fishes undergo drastic changes which may be defined as true metamorphosis when they are induced by thyroid hormones. Sicyopterus lagocephalus is an amphidromous goby that has to change biome twice during its life cycle. The first biome shift occurs few hours after hatching in the river. The aim...
Article
The restoration and the preservation of aquatics ecosystems is a critical issue in our contemporary society. In lake ecosystems, phytoplankton taxonomic-based indicators have been developed to evaluate water quality, but suffer of limited ecosystem ecological value. The recent development of functional approaches may allow to evaluate other aspects...
Article
This study investigates how age at first maturity of two tropical amphidromous species Sicyopterus lagocephalus (Pallas, 1770) and Cotylopus acutipinnis (Guichenot, 1863) varies in relation to their larval and juvenile life history. Reproductive stage was estimated based on histological observation of ovaries of more than 200 females of each specie...
Article
Atyoida serrata is a small amphidromous shrimp distributed in the south-west Indian Ocean. This species is threatened by human activities such as fisheries and river discharge withdrawals. Knowledge of its reproductive biology is essential to develop management plans and reduce the impacts of these threats. This study presents the results of a one-...
Article
Assessing ecological health of aquatic ecosystems is crucial in the current context of biodiversity loss to guide and prioritize management actions. Although several fish-based indices were developed to assess the ecological status of estuarine ecosystems, they do not provide guidance on the causal responses of communities to disturbances. The func...
Poster
Full-text available
Les poissons des rivières insulaires de la région Indo-pacifique sont majoritairement amphidromes. Les adultes de ces espèces vivent et se reproduisent en rivière. A l'éclosion, les larves dérivent passivement jusqu'à la mer où elles poursuivent leur croissance pendant plusieurs mois, avant de retourner en rivière. L'ontogénie est bloquée à un stad...
Article
Otolith microchemistry can provide crucial information to address gaps of knowledge in spatio‐temporal ecology of fish species. However, understanding the seasonal variability of water chemistry and its effect on otolith signatures is needed to interpret fish movements. Otolith multi‐elemental signatures were used to examine the diadromous migratio...
Article
Full-text available
The impact of species loss on ecosystems functioning depends on the amount of trait similarity between species, i.e. functional redundancy, but it is also influenced by the order in which species are lost. Here we investigated redundancy and sensitivity patterns across fish assemblages in lakes, rivers and estuaries. Several scenarios of species ex...
Article
Aim We applied a diversity partitioning approach to identify the influence of multiple environmental factors on taxonomic, functional and phylogenetic diversity of estuarine fish assemblages at different spatial scales. Our aim was to determine (1) how variation in γ‐diversity (estuary scale) is supported by changes in α‐ (local scale) and β‐compon...
Article
Amphidromous fish species reproduce in rivers, and their larvae immediately drift to the sea after hatching. Most of these larvae survive in freshwater for a few days only, rapidly reaching sea water is thus essential. Being of small size, especially among species of the Sicydiinae subfamily, the larvae possess poor swimming abilities; their drift...
Article
The life history strategies of fishes can be defined by specific combinations of demographic traits that influence species performances depending on environmental features. Hence, the constraints imposed by the local conditions restrict the range of successful strategies by excluding species poorly adapted. In the present study, we compared the dem...
Technical Report
Full-text available
Summary D5.1-1 Part 1: Multi-stressors on surface water and effects on ecological statusHumans have increased the discharge of pollution, altered water flow regime and modified the morphology of rivers. All these actions have resulted in multiple pressures on freshwater ecosystems, undermining their biodiversity and ecological functioning. The Euro...
Technical Report
Full-text available
A community hosted by an ecosystem composed of species sharing the same characteristics i.e. species showing the same response to the environment and/or species with the same impact on their environment, can be defined as a community with high functional redundancy. Such community is supposed to be less vulnerable to species loss and the ecosystem...
Article
Freshwater gobies of tropical islands are amphidromous: adults reproduce in rivers and larvae passively drift down to the sea immediately after hatching. Describing the phenology of this larval drift is essential to understand the population dynamics of amphidromous gobies and to develop ecologically based recommendations for managing the watershed...
Article
Estuaries are subjected to multiple anthropogenic stressors, which have additive, antagonistic or synergistic effects. Current challenges include the use of large databases of biological monitoring surveys (e.g. the European Water Framework Directive) to help environmental managers prioritizing restoration measures. This study investigated the impa...
Article
Diadromous species of tropical islands face numerous anthropogenic disturbances. Understanding how these disturbances affect the population dynamic of these species is important to develop ecologically based management measures. The upstream migration dynamics of two amphidromous gobies, Sicyopterus lagocephalus (Pallas) and Cotylopus acutipinnis (...
Article
Conventional methods for surveying diadromous fish migration from marine coastal waters to freshwater habitats are mainly based on electrofishing, a non-optimal technique for the study of fish migrations in rivers, and fishermen catch data. Underwater video has been recognized for a long time as a good alternative, but those approaches usually requ...
Conference Paper
Full-text available
European estuaries are subjected to a large spectrum of anthropogenic pressures, which are known to have additive, antagonistic, synergistic and multiplicative impacts on the functioning of ecological systems. Understanding the pressure-impact relationships and the interactions effects among pressures are essential requirements to develop accurate...
Technical Report
Full-text available
Aquatic ecosystems facing multiple stressors lead to challenging conditions for their management, as stressors can have additive, but also interactive effects on organisms, populations and communities. Accounting for these interactions is important in the assessment of the stressor’s impacts and to implement good restoration measures. Using a compa...
Presentation
Indigenous fish fauna in rivers of tropical volcanic islands is mainly composed by amphidromous gobies. Adults of these species grow and reproduce in rivers. Immediately after hatching, free embryos passively drift down to the sea where they develop as larvae during several months. At the end of larval stage, specimens return into rivers and migrat...
Technical Report
Full-text available
Les poissons et macrocrustacés indigènes qui vivent dans les eaux douces des DOM insulaires sont amphihalins : leur cycle de vie passe nécessairement par une phase larvaire marine, qui assure leur dispersion entre les îles. Cette particularité leur a permis non seulement de coloniser des milieux insulaires relativement récents, mais aussi de persis...
Technical Report
Full-text available
Aquatic ecosystems facing multiple stressors lead to challenging conditions for their management, as stressors can have additive, but also interactive effects on organisms, populations and communities. Accounting for these interactions is important in the assessment of the stressor’s impacts and to implement good restoration measures. Using a compa...
Article
Full-text available
Amphidromous gobies living in the rivers of tropical islands display a high continuous reproductive effort in response to environmental unpredictability. Females are usually able to spawn a large number of eggs over an extended season, which contributes to offset the high larval mortality. The increasing human pressure on the insular aquatic system...
Article
Amphidromous gobies represent a substantial part of freshwater fish diversity throughout islands of the Indo-Pacific region. They display a marine pelagic phase during several months before recruiting in rivers. Understanding the relationship between larval traits and environmental conditions is a major challenge for the evaluation of a spatial sca...
Technical Report
Full-text available
Les peuplements d’eau douce de poissons indigènes des régions insulaires tropicales et subtropicales sont principalement composés d’espèces diadromes. Ces dernières sont soumises à de nombreuses pressions d’origines anthropiques liées à l’aménagement et à la dégradation des cours d’eau. Parmi ces perturbations, la présence d’obstacles empêche la li...
Article
Full-text available
Freshwater populations of the Indo-pacific region are characterized by a large proportion of amphidromous species. In this paper, we analyse habitat selection by two amphidromous sympatric Gobiidae: Sicyopterus lagocephalus and Cotylopus acutipinnis in Reunion Island. A sampling method using Point Abundance Sampling (PAS) was conducted in 12 rivers...
Article
Full-text available
Amphidromous gobies are usually nest spawners. Females lay a large number of small eggs under stones or onto plant stems, leaves or roots while males take care of the clutch until hatching. This study investigates the breeding pattern and paternal investment of Sicyopterus lagocephalus in a stream on Reunion Island. In February 2007 and January 201...
Article
Full-text available
Amphidromous Sicydiinae are particularly widespread among fish freshwater assemblages of the Indo-Pacific region and are vulnerable to anthropogenic pressures (e.g. fishery, degradation and fragmentation of habitats). Spawning and hatching happen in freshwater, then offsprings drift downstream to the sea where they begin their growth for a few mont...
Article
Full-text available
In the Indo-Pacific region, rivers are inhabited by amphidromous gobies. They are often subjected to a heavy fishing pressure, highlighting the urgent need to acquire knowledge on their biology for management purposes. This study investigated the reproductive strategy of Sicyopterus lagocephalus, a widespread amphidromous goby, in two rivers of La...
Article
Full-text available
Freshwater-fish populations of the Indo-pacific region are characterised by a large proportion of amphidromous species. We analysed the spawning-habitat selection of Sicyopterus lagocephalus (Gobiidae: Sicydiinae) within two rivers of the Reunion Island. Reproduction traces are rare events, so a presence-only sampling procedure was performed to col...
Thesis
Full-text available
Les Sicydiinae amphidromes constituent une part importante des peuplements piscicoles insulaires de la région Indo-Pacifique et sont vulnérables à de nombreuses pressions anthropiques (i.e. pêcherie, dégradation et fragmentation des habitats). La reproduction a lieu en eau douce, puis les jeunes dévalent en mer où ils débutent leur croissance penda...
Article
Full-text available
Among amphidromous species, life-history traits of pelagic larvae show high variability between and within species and populations, due to the spatial and temporal variability of the marine environment. Temperature, food availability and seasonal conditions affect survival and larval growth. Among species with an extensive reproduction period, the...
Article
Full-text available
The widely distributed amphidromous goby Sicyopterus lagocephalus needs drastic change of habitat to fulfil its life-cycle: adults live and spawn in rivers, where eggs hatch in pro-larvae that have to reach the sea in a narrow temporal scale, to acquire marine characteristics, and begin their oceanic dispersal as planktonic larvae. Post-larvae retu...

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