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Sakina-Dorothée Ayata

Sakina-Dorothée Ayata
Sorbonne Université | UPMC · Centre des Sciences de la Mer (Stations marines UPMC de Banyuls/Mer, Roscoff et Villefranche/Mer)

PhD

About

45
Publications
17,044
Reads
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1,150
Citations
Citations since 2016
25 Research Items
958 Citations
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Introduction
Sakina-Dorothée Ayata is Associate Professor at Sorbonne Université in France. She currently works at the Laboratoire d'Océanographie de Villefranche-sur-mer, where she does research in marine ecology and ecosystem modelling of plankton communities.
Additional affiliations
September 2012 - present
Sorbonne Université
Position
  • Professor (Associate)

Publications

Publications (45)
Article
AbstractThe aim of this study is to evaluate the consequences of accounting for variable Chl:C (chlorophyll:carbon) and C:N (carbon:nitrogen) ratios in the formulation of phytoplankton growth in biogeochemical models. We compare the qualitative behaviour of a suite of phytoplankton growth formulations with increasing complexity: 1) a Redfield formu...
Article
For many marine species, larval dispersal plays a crucial role in population persistence, re-colonization of disturbed areas, and distribution of species range limits through the control of population connectivity. Along the French Atlantic coast (NE Atlantic), a biogeographical transition zone has been reported between temperate and cold-temperate...
Article
The honeycomb worm Sabellaria alveolata forms biogenic reefs which constitute diversity hotspots on tidal flats. The largest known reefs in Europe, located in the Bay of Mont-Saint-Michel (English Channel), are suffering increasing anthropogenic disturbances which raise the question of their sustainability. As the ability to recover depends partly...
Article
Full-text available
For more than a decade, high‐throughput sequencing has transformed the study of marine planktonic communities and has highlighted the extent of protist diversity in these ecosystems. Nevertheless, little is known relative to their genomic diversity at the species‐scale as well as their major speciation mechanisms. An increasing number of data obtai...
Article
Full-text available
Functional traits are increasingly used to assess changes in phytoplankton community structure and to link individual characteristics to ecosystem functioning. However, they are usually inferred from taxonomic identification or manually measured for each organism, both time consuming approaches. Instead, we focus on high throughput imaging to descr...
Article
Full-text available
Plankton imaging systems supported by automated classification and analysis have improved ecologists' ability to observe aquatic ecosystems. Today, we are on the cusp of reliably tracking plankton populations with a suite of lab‐based and in situ tools, collecting imaging data at unprecedentedly fine spatial and temporal scales. But these data have...
Article
Full-text available
Quantitative imaging instruments produce a large number of images of plankton and marine snow, acquired in a controlled manner, from which the visual characteristics of individual objects and their in situ concentrations can be computed. To exploit this wealth of information, machine learning is necessary to automate tasks such as taxonomic classif...
Article
Full-text available
Vertical variations in physical and chemical conditions drive changes in marine zooplankton community composition. In turn, zooplankton communities play a critical role in regulating the transfer of organic matter produced in the surface ocean to deeper layers. Yet, the links between zooplankton community composition and the strength of vertical fl...
Article
Full-text available
Marine microbes play a crucial role in climate regulation, biogeochemical cycles, and trophic networks. Unprecedented amounts of data on planktonic communities were recently collected, sparking a need for innovative data-driven methodologies to quantify and predict their ecosystemic functions. We reanalyze 885 marine metagenome-assembled genomes th...
Article
Full-text available
Imaging techniques are increasingly used in ecology studies, producing vast quantities of data. Inferring functional traits from individual images can provide original insights on ecosystem processes. Morphological traits are, as other functional traits, individual characteristics influencing an organism’s fitness. We measured them from in situ ima...
Article
Full-text available
Aquatic ecologists face challenges in identifying the general rules of the functioning of ecosystems. A common framework, including freshwater, marine, benthic, and pelagic ecologists, is needed to bridge communication gaps and foster knowledge sharing. This framework should transcend local specificities and taxonomy in order to provide a common gr...
Article
Full-text available
In this paper we review the technologies available to make globally quantitative observations of particles in general-and plankton in particular-in the world oceans, and for sizes varying from sub-microns to centimeters. Some of these technologies have been available for years while others have only recently emerged. Use of these technologies is cr...
Article
Full-text available
Mixotrophy, or the ability to acquire carbon from both auto- and heterotrophy, is a widespread ecological trait in marine protists. Using a metabarcoding dataset of marine plankton from the global ocean, 318,054 mixotrophic metabarcodes represented by 89,951,866 sequences and belonging to 133 taxonomic lineages were identified and classified into f...
Poster
Full-text available
Aquatic ecologists face a common challenge: identifying the general rules of the functioning of aquatic ecosystems and developing a more predictive ecological understanding. However, freshwater and marine ecologists traditionally form two distinct scientific communities that barely communicate with each other. A common language is needed to foster...
Article
Full-text available
To assess the impact of climate change on the functional diversity of marine zooplankton communities. The Mediterranean Sea. We used the functional traits and geographic distributions of 106 copepod species to estimate the zooplankton functional diversity of Mediterranean surface assemblages for the 1965–1994 and 2069–2098 periods. Multiple environ...
Article
To assess the degree of overlap between the environmental niches of marine planktonic copepods and test if the distribution of copepod functional groups differs across environmental gradients. The Mediterranean Sea. Functional groups were defined based on clustering of functional traits in 106 marine copepod species using a multivariate ordination...
Article
Regionalisation aims at delimiting provinces within which physical conditions, chemical properties, and biological communities are reasonably homogeneous. This article proposes a synthesis of the many recent regionalisations of the open-sea regions of the Mediterranean Sea. The nine studies considered here defined regions based on different, and so...
Article
Full-text available
With global climate change altering marine ecosystems, research on plankton ecology is likely to navigate uncharted seas. Yet, a staggering wealth of new plankton observations, integrated with recent advances in marine ecosystem modeling, may shed light on marine ecosystem structure and functioning. A EuroMarine foresight workshop on the " Impact o...
Data
Depth of the Epi/meso, meso/bathy, and bottom on 0.2° grid
Article
Ensemble niche modelling has become a common framework to predict changes in assemblages composition under climate change scenarios. The amount of uncertainty generated by the different components of this framework has rarely been assessed. In the marine realm forecasts have usually focused on taxa representing the top of the marine food-web, thus...
Data
Information on the functional traits was gathered for the most commonly-sampled copepod species of the Mediterranean Sea. Our database includes 191 species described by 7 traits encompassing diverse ecological functions: minimal and maximal body length (mm), trophic group (Omnivore/Carnivore/Herbivore/Detritivore), feeding type (Cruise-feeding/Filt...
Article
Full-text available
We gathered information on the functional traits of the most representative copepod species in the Mediterranean Sea. Our database includes 191 species described by 7 traits encompassing diverse ecological functions: minimal and maximal body length, trophic group, feeding type, spawning strategy, diel vertical migration and vertical habitat. Cluste...
Article
Full-text available
PERSEUS project aims to identify the most relevant pressures exerted on the ecosystems of the Southern European Seas (SES), highlighting knowledge and data gaps that endanger the achievement of SES Good Environmental Status (GES) as mandated by the Marine Strategy Framework Directive (MSFD). A complementary approach has been adopted, by a meta-anal...
Conference Paper
Full-text available
Phytoplankton are ectotherms and are thus directly influenced by temperature. They experience temporal variation in temperature which results in a selection pressure. Using the Adaptive Dynamics theory and an optimization method, we study phytoplankton thermal adaptation (more particulary the evolution of the optimal growth temperature) to temperat...
Chapter
Full-text available
In recent decades, it has been found useful to partition the ocean using the concept of ecoregionalisation where within each region it is assumed that environmental conditions and species associations are distinguishable and unique. Indeed, all partitions of the ocean that has been proposed aimed to delineate the main oceanographical, ecological pa...
Article
Phytoplankton C:N stoichiometry is highly flexible due to physiological plasticity, which could lead to high variations in carbon fixation efficiency (carbon consumption relatively to nitrogen). However, the magnitude, as well as the spatial and temporal scales of variability, remain poorly constrained. We used a high resolution biogeochemical mode...
Presentation
Full-text available
In recent decades, it has been found useful to ecoregionalise the pelagic environment assuming that within each partition environmental conditions are distinguishable and unique. Indeed, each partition of the ocean that is proposed aimed to delineate the main oceanographical and ecological patterns to provide a geographical framework of marine ecos...
Article
Full-text available
The relationship between meroplankton distribution and spatio-temporal variability of coastal mesoscale hydrological structure was investigated in the northern Bay of Biscay, North-East Atlantic. For the three coastal polychaetes studied, i.e. Pectinaria koreni, Owenia fusiformis and Sabellaria alveolata, the highest larval abundances were sampled...
Article
Climate may act on the dispersal and connectivity of marine populations through changes in the oceanic circulation and temperature, and by modifying species’ prey and predator distributions. As dispersal and connectivity remain difficult to assess in situ, a first step in studying the effects of climate change can be achieved using biophysical mode...
Article
Human-mediated transport and aquaculture have promoted the establishment of non-indigenous species in many estuaries around the world over the last century. This phenomenon has been demonstrated as a major cause of biodiversity alterations, which has prompted scientists to provide explanations for the success or failure of biological invasions. Cre...
Article
By ensuring the dispersal, the larval phase plays a fundamental role in the population dynamics of benthic invertebrates with a complex life cycle and determines the connectivity within marine metapopulations. Hence, the connectivity influences directly the dynamics of metapopulations and the persistence of local populations, the expansion abilitie...
Article
Full-text available
En assurant la dispersion, la phase larvaire joue un role fondamental dans la dynamique des populations d'invertébrés marins à cycle de vie bentho-pélagique et détermine la connectivité au sein des métapopulations marines. La connectivité en milieu marin influence ainsi directement la dynamique des métapopulations et la persistance des populations...

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