Athanasios Nikolaou

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Introducing Tikta - a GES4SEAS software YouTube video by GES4SEAS

Today is #WorldWildlifeDay2026 and it is a good day to launch our #GES4SEAS Tikta software to assess the cumulative effects at sea and its environmental status. Learn here in this video
#MarineEcology
#Research

youtu.be/POx9iXz1ufo

Chronic ocean heating fuels ‘staggering’ loss of marine life, study finds Fish levels fall by 7.2% with as little as 0.1C of warming per decade, northern hemisphere research shows

A new study finds fish biomass drop 7.2% for every 0.1°C of ocean floor warming per decade. Every fraction of a degree matters.

www.theguardian.com/environment/...

#Biodiversity doesn’t follow borders — but #conservation policy still does. A new policy brief, inspired by Haubrock et al. (2026), calls for cross-border coordination, open ecological data, and stronger early warning to tackle #InvasiveSpecies. Supported by #GuardIAS
#bioinvasions 🧪🌐🌍

🌊 #ECSA61 Special Session 32

How can we better prevent & manage marine biological invasions in estuarine and coastal waters?

📍 Brussels | 24–27 Aug 2026
🗓 Abstracts due: 6 Mar 2026

👉 www.estuarinecoastalconference.com/special-sess...

#InvasiveSpecies #Biosecurity #GuardIAS #bioinvasions

Ocean optimism: hope for the ocean and societies MOOC #6, February 2026 GES4SEAS project

Welcome to a new #MOOC of #GES4SEAS project on #oceanoptimism, to be developed during next four weeks, on Mondays, Wednesday and Fridays.
Come and help us to change the narrative about the ocean!
We need some hope and good news!

You will learn about good practices and examples of recovery and good status of marine ecosystems around the world,
You can share them with your friends, students or family!
It is a good opportunity to change behaviour towards the #ocean
#GES4SEAS #MOOC #oceanoptimism

Increasing bottom marine heatwaves pose a critical risk to Mediterranean benthic species Marine heatwaves (MHWs) are extreme ocean temperature events broadly affecting marine ecosystems. The Mediterranean Sea has faced severe impacts from …

#Mediterranean seafloors are heating fast 🌊🔥. Our new study shows bottom marine #heatwaves will intensify, last longer, and threaten benthic species—often year-round by 2100. A growing #ClimateRisk for benthic #biodiversity.
#ClimateChange 🌍🌐🧪

www.sciencedirect.com/science/arti...

AZTI SUMMER SCHOOL 2026 "Cumulative effects of multiple human pressures at sea and their impacts on ecosystem components: a practical application for environmental status assessment" - AZTI AZTI Summer School 2026 offers hands-on training on Tikta for assessing cumulative pressures and marine environmental status.

It's my pleasure to annnounce a new @azti.bsky.social #GES4SEAS summer school: assessing cumulative effects from multiple #pressures at sea, a practical application, using our Tikta tool. There is a limited number of places, apply now!
#Research
#MarineEcology

www.azti.es/en/events/su...

Ocean optimism: hope for the ocean and societies. MOOC #6 February 2026 GES4SEAS project

How do media communicate marine science?

In addition to trusted scientific information, we need to provide hope in the future to society, with examples of good practices.

Let's learn about these in this #MOOC, starting on February 2️⃣.

Stay tuned!

#GES4SEAS #oceanoptimism

Meta-analysis reveals negative but highly variable impacts of invasive alien species across terrestrial insect orders - Nature Communications Insects are crucial for ecosystem functioning but face multiple threats, including invasive alien species. Here the authors quantify impacts of invasive alien species on four insect orders, with effec...

"Invasive alien species reduce the abundance of insects included in our study by 31%, and species richness by 26%, though these impacts are highly variable across taxa. Stronger negative impacts are found for invasive alien animals compared to invasive alien plants"
www.nature.com/articles/s41...

WATCH NOW: Real-time imaging of microplastic gut passage in zooplankton A new study has, for the first time, recorded and measured just how fast microplastics move through the gut passage of a key zooplankton species in real time – and used those measurements to estimat

A new study has, for the first time, recorded & measured just how fast #microplastics move through the gut passage of a key #zooplankton species, revealing #copepods may be moving 100s of plastic particles per cubic metre of seawater down through the water column every day: pml.ac.uk/news/watch-n...

Marine functional #connectivity matters—from genes to energy flows. This synthesis clarifies concepts, unifies fragmented approaches, and proposes a global framework to better link science, #SpatialPlanning, and #policy in a changing ocean. doi.org/10.1002/brv....
#MarineEcology 🌐🌍🧪🌊

🦭 Mediterranean monk seal (Monachus monachus) spotted in Pegeia, Cyprus 🇨🇾
One of the world’s endangered seals, observed resting along the coast 🌊
#MonachusMonachus #MarineConservation #Cyprus

Just published: a global synthesis of the ecological, economic, and socio-cultural impacts of #BiologicalInvasions, led by P. Haubrock. A timely framework for science, management, and policy in the Anthropocene.
👉 doi.org/10.1002/brv....
🧪🌐🌍 #bioinvasions #InvasiveSpecies

this is a good distinction, the management is based on the ecosystems, but actions and measures are taken on human activities and pressures or to revert impacts (e.g. restoration)

#MarineEcology
#Research

#EBM is a dynamic and cyclical process 🔄 A key idea here is adaptive management: we don’t just act once; we learn, and adjust. It starts with assessing and mapping the environmental status and the cumulative impacts of human activities on ecosystems 🌍This tells us where and what pressures are […]

📢New paper! Introducing GLOSSA, an open-source, user-friendly tool for marine species distribution modeling using Bayesian machine learning.
🔗https://besjournals.onlinelibrary.wiley.com/doi/10.1111/2041-210x.70167

@icmcsic.bsky.social 
@cienciagob.bsky.social 
@jmestret.bsky.social

So far in this #MOOC we’ have explored some core principles of #EBM (Ecosystem-Based Management) 🌊but here’s something we haven’t yet talked about:

👉 EBM isn’t a one-off process. It’s cyclical and constantly evolving.
How does this make the ends meet? Stay tuned to find out…

This is the moment we realised what we were looking at.

During @nemo-tools.bsky.social ROV surveys to map gorgonian & coralligenous habitats, the seafloor suddenly turned into a landscape of circular nests, each guarded by a male.

We weren’t searching for spawning grounds – we dropped onto one.

🐟🪸We’ve just published the first documented nesting aggregation of black seabream (Spondyliosoma cantharus) in the Mediterranean Sea.

Author link (view-only): rdcu.be/eTtif

@skatsanevakis.bsky.social @thanasisnikolaou.bsky.social
#NEMOTOOLS #marinebiology #ROV #spawninggrounds #conservation

The University of the Aegean invites applications for a 2-year Researcher (MSc, #MarineEcology) post under the LIFE-PINNACARE project. Focus: Pinna nobilis #conservation in Greece + field work.
📅 Apply by 6 Jan 2026.
📧 More info: euraxess.ec.europa.eu/jobs/393307
— dive in!
#Conservation #job 🌍🌐

As we can see so far in this #MOOC, it is a balancing act ⚖️. #EBM seeks a sustainable balance, rather than letting one sector's goals (for instance, energy) undermine the health of the entire system (for instance, conservation goals and activities). 🌊🌊

Global microplastic pollution at levels harmful to marine life - Environmental Science and Pollution Research Poor waste management has resulted in marine plastic litter increasing worldwide, and microplastics (MP) are now detected in all marine habitats. To better understand the distribution and ecological i...

🌍Interesting new study concluding "in the thousands of locations sampled in this meta-analysis, the mean #microplastic densities are high enough to expect fundamental biological processes, such as growth & reproduction of marine fauna to be significantly negatively impacted."
doi.org/10.1007/s113...

A quantitative risk assessment framework for mortality due to macroplastic ingestion in seabirds, marine mammals, and sea turtles | PNAS Plastic ingestion has been documented in nearly 1,300 marine species, including every seabird family, marine mammal family, and sea turtle species....

🐢🦭🐦New @pnas.org study provides a quantitative risk assessment framework for mortality due to macroplastic ingestion in seabirds,marine mammals & sea turtles.
6 to 405 pieces of ingested #plastic (or volume of 0.044-39.89 cm3/cm length) lead to a 90% chance of mortality.
www.pnas.org/doi/10.1073/...

🔊🌊 Just out in Sensors: a low-cost (~50 €) #hydrophone toolkit for robust underwater #AcousticMonitoring. Built for researchers, educators and #CitizenScientists eager to explore marine #soundscapes. Hear the ocean differently. 🐳🛥️🐬📡 www.mdpi.com/1424-8220/25...
#MarineEcology 🌍🌐🧪

🔊🌊 Great moments with the Scouts this week! We introduced them to our ~50 € hydrophone, handed out units, and dove into citizen-science together. Nothing better than seeing young explorers record their first marine soundscapes. 🐬✨ #OceanScience #CitizenScience 🧪

So, is #EBM just a concept on paper? Not at all. 📜
It is already shaping how we manage European seas, through global conventions, directives, regional policies, and local implementation.
Stay tuned for next week’s #MOOC on how EBM spans marine sectors & the related challenges🚧

But what is the environmental status of European waters? Consult the following paper for an overview:
👇
conbio.onlinelibrary.wiley.com/doi/full/10....

Same area, but now with the pressure visible: longlines, ropes and other fishing gear litter entangling gorgonians and covering the seabed. Chronic ghost fishing and structural damage that we urgently need to address.
#marinelitter #ghostfishing #MPA #conservation @thanasisnikolaou.bsky.social