IMEDEA Calendar
maig 2024
Dl Dt Dc Dj Dv Ds Dg


Sunlight drives virtually all life on the Earth’s surface, with about 50% of primary productivity occurring in marine systems. Yet, this traditional view of phototrophy changed radically with the discovery of marine bacterial rhodopsins (i.e., proteorhodopsins; PR), over twenty years ago. PRs are simple light-driven proton pumps present in over 80% of surface bacterioplankton, which allow them to transform light into biochemical energy.

Combining culture-based physiology studies with (meta)-genomics, (meta)-transcriptomics, and environmental quantifications we are just starting to understand the role that PR-based photoheterotrophy plays in the ocean. In this presentation, I will discuss the knowns and unknowns of PR-phototrophy and what we are starting to learn from looking at its natural distributions in different oceanographic basins, ranging from extreme ultraoligotrophic regions to high productivity environments

maig 3 12:00 13:00
TREC Sequencing Course Mallorca

Introductory course to Next Generation Sequencing tecniques organized within the Maria de Maeztu Programme in collaboration with EMBL.


May 6th 2024 Monday                     


Wet lab lectures

10:00 – 10:45


Session 1: Considerations for experimental design.

(Laura Villacorta – Genecore EMBL)

10:45 – 11:30


Session 2: Sample isolation and preparation. Applications. (Laura Villacorta – Genecore EMBL)


11:30 – 12:00

Coffee break (on site)

12:00 – 12:45

Session 4: Short-read sequencing.

(Laura Villacorta – Genecore EMBL)

12:45 – 13:30

Session 5: Long-read sequencing.

(Laura Villacorta – Genecore EMBL)

13:30 – 14:30

Lunch break (free time)

14:30 – 15:15

Session 3: Making of Platynereis into a Model Organism.

(Leslie Pan, Arendt’s lab, EMBL)


The Arendt group is interested in the evolution of central nervous system in bilateral animals. With sequencing technologies becoming more accessible, we have built extensive genomics resources that has allowed us to dive deeper into cell type evolution. Leslie will introduce different published and unpublished works from the group, and how we leveraged the different sequencing technologies.

1. Assembling the genome of a highly heterozygous worm

2. Single cell transcriptomes for cross species comparison

3. In field genotyping/sequencing for species identification

15:15 – 16:15

Session 6: Wet lab consultations.

(Laura Villacorta, Leslie Pan, Jonathan Landry)




May 7th 2024 Tuesday


Dry lab lectures

10:00 – 11:30



Session 7: Sequencing data formats and data QC.

(Jonathan Landry – Genecore EMBL)

11:30 – 12:00

Coffee break (on site)

12:00 – 13:00 


Session 8: Dry lab consultations

(Jonathan Landry - Genecore EMBL)



maig 6
Curso Base Programacion
maig 6 14:00 16:00
SEMINARIO JB Raina (UT Sydney) - Uncovering complex chemically mediated microbial behaviours


The ability of marine bacteria to direct their movement in response to chemical gradients influences inter-species interactions, nutrient turnover, and ecosystem productivity. While natural chemical hotspots produce gradients comprised of hundreds to thousands of different chemical compounds, we do not know how this chemical diversity affects the chemotactic responses of bacteria. I will present results from two studies that reveal some unexpected responses when bacteria are exposed to complex chemical mixtures. Using in situ and laboratory-based assays, we show that marine bacteria are strongly attracted to the abundant algal polysaccharide laminarin, but chemotaxis towards this large molecule is enhanced by dimethylsulfoniopropionate (DMSP), another ubiquitous algal-derived metabolite. Our results indicate that DMSP acts as a methyl donor for marine bacteria, increasing their gradient detection capacity and facilitating their access to polysaccharide patches. Using a novel chemotaxis choice assay, we then directly expose a model marine bacterium to four potent chemoattractants simultaneously (i.e., one monosaccharide and three amino acids). Although the bacterium is strongly chemotactic to each of these molecules in isolation, when these four molecules are provided simultaneously, the cells exhibit a striking response by swimming towards only one of them. These results start shedding light on the synergistic effects (e.g., laminarin and DMSP) and sharp chemical preferences modulating the behaviours of bacteria.

maig 7 12:00 13:00



Seagrass meadows and the services they provide are declining worldwide as a result of human perturbations. Along the Swedish W coast, almost 60% of the seagrass has been lost since the 1980's, representing a loss of approximately 190 km2 of seagrass. The seagrass Zostera marina, L. (eelgrass) is the dominant macrophyte on soft bottoms along the Swedish coast. The decrease in seagrass worldwide has lead to many restoration programs but their success rate is very low due to the regime shift and feedback mechanisms that also prevent natural recovery.

This presentation aims to provide a review on the restoration successes and challenges on eelgrass in Sweden. For example, positive feedbacks generated by water turbidity due to sediment resuspension, drifting macroalga covering eelgrass transplants and the presence of eelgrass predators such as shore crabs have been identified as causes affecting restoration success. To overcome these issues, restoration techniques using sand-capping have shown to be successful to reintroduce eelgrass in areas where it was lost. An interdisciplinary approach using field and laboratory experiments linked with hydrodynamical modeling showed to be key to understand the complex coastal ecological dynamics.

In addition, new methods to monitor coastal habitats such as seagrass meadows and marine mammals (dugongs and seals) using aerial drones and machine learning will be presented. These new technologies can contribute to faster data collection and data analysis for ecological studies and to provide relevant information to coastal managers and decision makers working on ecological conservation.


Eduardo Infantes is a researcher at the University of Gothenburg in Sweden, where he leads the Seagrass Ecology Lab research group  based at Kristineberg marine station. With a focus on seagrass ecology over the last 18 years, his main interests are in 1) studying interactions between fluid dynamics and marine vegetation through field data, mesocosm experiments and flume studies, 2) restoration of coastal habitat using seagrass within the interdisciplinary ZORRO group, and 3) monitoring of seagrass beds and marine mammals (e.g. harbor seals, manatees, and dugongs) using drones and AI. With an interdisciplinary profile, he collaborates in research and management, contributing to environmental policies in coastal restoration and monitoring.

maig 8 10:45 12:00
Curso Base Programacion
maig 9 14:00 16:00


Establishing root systems in rhizome fragments of Posidonia oceanica presents a significant challenge for its restoration. Rhizome fragments of this slow-growing seagrass require robust rooting for successful anchorage and nutrient absorption from the environment. Controlled experiments have demonstrated that the use of plant growth regulators, such as the auxins α-naphthaleneacetic acid (NAA) and indole-3-butyric acid (IBA), stimulates rooting in P. oceanica cuttings. However, this effect has not been tested in a marine environment. In this study, rhizome fragments were exposed to varying concentrations of NAA and IBA for 24 hours before transplanting into a dead matte area in the Bay of Pollensa (Mallorca, Spain). After one year, all fragments survived; however, contrary to expectations, no significant differences emerged in the growth and biomass of roots, rhizomes (orthotropic and plagiotropic), and leaves between treated and untreated fragments. This implies that applying auxins to P. oceanica rhizome fragments may not offer an advantage when rooting transplants in the marine environment. Future studies should explore how other environmental conditions can influence rooting and interactions with auxin effects over time.



maig 10 12:00 12:30
maig 11 10:00 13:00
Actualización del Programa María de Maeztu (Dra. Anna Traveset)
maig 16 11:00 12:00
Seminar “Eelgrass restoration in the West coast of Sweden: Successes and challenges ahead”
maig 16 15:00 16:00



The animal gut hosts diverse bacterial communities that can affect the individual’s behavior, physiology, and metabolism. However, the relationship between an individual’s microbiome and its social behavior in the wild is poorly understood. We tested the hypothesis that social behavior in the wild is correlated with the gut microbiome composition in a marine fish (Xyrichtys novacula). Relying on high-resolution acoustic telemetry, we first obtained a high-quality positioning data set from 232 individuals (153 females and 79 males). From these data, we computed the associations between paired individuals and found a harem-like social structure. Territories were formed by one male and several females, and males displayed agonistic behaviors towards their neighbors to defend territories. Subsequently, a sample of the social network was captured, and the diversity of the gut microbiome was quantified using operational phylogenetic units (OPUs) based on the analysis of 16S rRNA gene amplicons using Illumina high throughput sequencing. The social network properties were strongly correlated to the gut microbiome. Individual microbiome samples of fish from the same harem (including from different sex) were more similar to each other, while differences to other harems were strong. The use of similar local microhabitats, including food resources, as well as local social contact can both provide key transmission pathways for gut symbionts that shape gut microbiota, structuring the microbiome along social networks in aquatic animals. This work is among the first to show a relationship between social structure and the microbiome in a fish species in the wild. Further work is needed to reveal cause-and-effect relationships into whether the social network shapes the microbiome or the microbiome and the resulting metabolites shape certain behaviors that in turn create the network structure.

maig 17 12:00 12:30



Seed predation and dispersal play key roles in the regeneration of tropical trees. Seeds may escape pre-dispersal predation when ingested with the fruit pulp and moved away from the parent trees by frugivores. Frugivore species may influence dispersal quality differently even when feeding on the same fruit species. In southern Mexico, we investigated if seed traits (i.e., length, width, and mass) and germination success differed among seeds ingested by howler monkeys (Alouatta pigra), spider monkeys (Ateles geoffroyi), and non-ingested seeds. For this, we recorded the germination rate and percentage of seeds from five tropical tree species, including the following: Ampelocera hottlei , Brosimum lactescens , Dialium guianense, Spondias mombin and Spondias radlkoferi. Furthermore, only for D. guianense we determined if there was a primate selection towards seeds with no insect damaged. Results showed that traits of seeds ingested by howler monkeys differed from those ingested by spider monkeys and non-ingested seeds; while seeds ingested by spider monkeys were similar to non-ingested seeds. Howlers consumed on average the larger seeds. For all five tree species, germination rate was greatest for seeds ingested by howler monkeys. The proportion of damaged seeds declined significantly from non-ingested seeds (48 %), to seeds in spider monkey feces (29 %), and finally to seeds in howler monkey feces (7 %). Fruit selection by primate species influences dispersal quality differently, even when feeding on the same plant species. Howler monkeys may increase the reproductive success of the studied tree species by selecting larger and predation-free seeds/fruits.

maig 24 12:00 12:30

You4Blue - Young Generations for Sustainable Blue Growth es un proyecto Erasmus+ dirigido a estudiantes de secundaria en tres islas mediterráneas de la UE, con el objetivo de aumentar la conciencia sobre los desafíos ambientales y proporcionar herramientas para una vida sostenible. El proyecto fomenta una nueva relación con el medio ambiente, desarrolla competencias en áreas STEAM y TIC, y promueve habilidades blandas como la empatía y el pensamiento crítico.

En el marco de este proyecto, el “Sea Curriculum” promueve la participación de estudiantes locales en experiencias prácticas relacionadas con los ecosistemas y las ciencias marinas. Este componente está coordinado por IMEDEA en colaboración con IES Bendinat, con el objetivo de desarrollar e implementar estas actividades de aprendizaje. Una de las actividades consiste en que los estudiantes elijan una temática de investigación y preparen una presentación, la cual será expuesta en IMEDEA.


Comprender y mitigar la acidificación de los océanos

AUTORES: Gemma Semley-Dyne, Fiona Martina Torres Cruz, Manoela Tsvetanova Manolova, Marc Reynes Garcia, Amelia Moral Blanco, Vlada Stashkevych.


¿Es posible un turismo sostenible en Mallorca?

AUTORES: Marcos Merino Sierra, Amadou Sall, Toni Matias Castell, Daniel Sander Gassner, Diego Bertorelli Carmona


Praderas de Posidonia: ante una nueva extinción?

AUTORES: Fernando Blanes, Hugo Gonzalez, Noelia Navarro, Alicia Catalá, Andrea Thyus, Lily Ron

maig 31 12:00 12:30