Konstantinos Tsiamis

Konstantinos Tsiamis
European Commission | ec

MS, PhD

About

107
Publications
64,615
Reads
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1,561
Citations
Introduction
Marine Biology and Oceanography; expertise in alien species: monitoring, ecology, impacts, data management; scientific/technical support officer of the EU official database on European alien species (EASIN); specific interest in seaweeds (green, brown and red macroalgae) and seagrasses
Additional affiliations
February 2015 - present
European Commission, DG Joint Research Centre
Position
  • Scientific / Technical Support Officer
November 2012 - January 2015
Hellenic Centre for Marine Research
Position
  • Free-Lancer Biologist – Oceanographer Researcher
May 2012 - October 2012
Hellenic Centre for Marine Research
Position
  • PostDoc Position
Education
October 2007 - March 2012
National & Kapodistrian University of Athens, Greece
Field of study
  • Biology
October 2004 - December 2006
National & Kapodistrian University of Athens, Greece
Field of study
  • Faculty of Biology
October 2000 - July 2004
National & Kapodistrian University of Athens, Greece
Field of study
  • Biology

Publications

Publications (107)
Article
The loss of Mediterranean macroalgal populations dominated by Cystoseira sensu lato is driven by a multitude of pressures. In the eastern Mediterranean Sea, climate change and the establishment of Lessepsian herbivore species have further intensified the ongoing decline of these canopy-forming algae. Knowledge of the reproductive phenology, embryol...
Article
Full-text available
Marine primary producers are highly sensitive to environmental deterioration caused by natural and human-induced stressors. Following the Water Framework Directive and the Marine Strategy Framework Directive requirements, the importance of using the different primary producers of the coastal marine ecosystem (pelagic: phytoplankton and benthic: mac...
Article
Citizen science (CS) expands the spatial and temporal scale of alien species records. As such, it has been recognized as a complementary tool in alien species management and large-scale biodiversity conservation. The present study assessed the contribution of CS to the recording of marine alien fishes and mollusks in European marine waters by revie...
Article
Full-text available
The present pilot study tested and validated the use of the 'Invasive Alien Species in Eu-rope' smartphone app (IASapp) in the Lower Danube Region. The study was conducted in three stages: (1) Testing the effectiveness of the app in Bulgaria, Romania and Serbia by organizing information and field testing campaigns; (2) Improving and extending the f...
Article
Full-text available
This Collective Article presents information about 27 taxa belonging to five Phyla (one Ochrophyta, one Cnidaria, three Arthropoda, two Mollusca and twenty Chordata) and extending from the Western Mediterranean Sea to the Levantine Sea and the Black Sea (Sea of Marmara). The new records were reported from 11 countries as follows: Algeria: occurrenc...
Article
Full-text available
Human-induced biological introductions pose a major threat to global biodiversity, and this is especially frequent in the eastern Mediterranean region, which is a globally important biodiversity hotspot area of high conservation value. To predict at which level introduced species in this region might become invasive under current and projected clim...
Article
Full-text available
The Convention on Biological Diversity (CBD) pathways classification framework used in the implementation of the European Union’s (EU) Regulation 1143/2014 on invasive alien species (IAS Regulation) has recently been adopted by the European Alien Species Information Network (EASIN), the official information system supporting the implementation of t...
Technical Report
Full-text available
The species status assessment for the Marine Strategy Framework Directive is structured around five Good Environmental Status (GES) criteria, i.e., by-catch rate, population abundance, population demographic characteristics, species distribution and habitat for the species. The MSFD Biodiversity theme for species includes, among others, some highly...
Article
Full-text available
Citizens around the world can act like scientists by providing important information about biodiversity that can help scientists’ research. The same applies to species that expand from their areas of origin to other places, often creating problems for the native species. Nowadays, there are plenty of projects that involve citizen scientists in the...
Article
Several invasive non-indigenous species (NIS) cause ecological and socio-economic impacts. A good understanding of the impacts of invasive NIS in Mediterranean habitats is important for managing and prioritising measures in the marine environment. We applied a conservative additive model to sum up the Cumulative IMPacts of invasive Alien (CIMPAL) s...
Chapter
An updated overview of the marine seaweed (macroalgae) flora and vegetation of the Aegean Sea coasts is provided. The total number of species and infraspecific taxa currently reported from the Aegean Sea reaches 600 taxa in total by 2020, of which 183 taxa are pending confirmation of their presence. Additional taxa are treated as excludenda or inqu...
Article
Full-text available
This study presents the updated status of marine non-indigenous species (NIS) distribution in Greece and investigates trends in new NIS introductions, at both national and subnational level, during 1970-2017. The overall picture shows an increase in new introductions from the 1970s to 2017. The number of unaided introduced species (mainly Lessepsia...
Article
Full-text available
The number of alien species arriving within new regions has increased at unprecedented rates. Managing the pathways through which alien species arrive and spread is important to reduce the threat of biological invasions. Harmonising information on pathways across individual sectors and user groups is therefore critical to underpin policy and action...
Article
Full-text available
This Collective Article presents information about 21 taxa belonging to seven Phyla (one Ochrophyta, one Porifera, three Cni-daria, two Arthropoda, three Mollusca, one Echinodermata, and ten Chordata) and extending from the western Mediterranean Sea to the Levantine Sea. The new records were reported from nine countries as follows: Spain: first rec...
Chapter
The Aegean Sea is highly impacted by biological invasions with 209 alien species being reported until the end of 2019, of which 149 are considered as established. Among these, the most abundant group is Pisces, followed by Mollusca, Crustacea, Annelida, and Macrophyta. There is an increasing trend of new species introductions in the Aegean Sea, rea...
Article
Full-text available
Invasive alien species (IAS) induce changes to community structure and functions which lead to a decline of endemic species and major irreversible changes to the local physical habitat. The distribution and the impacts of multiple freshwater IAS are not well known, and they have not been investigated simultaneously at catchment and at European scal...
Article
Full-text available
Good datasets of geo-referenced records of alien species are a prerequisite for assessing the spatio-temporal dynamics of biological invasions, their invasive potential, and the magnitude of their impacts. However, with the exception of first records on a country level or wider regions, observations of species presence tend to remain unpublished, b...
Article
Full-text available
Good datasets of geo-referenced records of alien species are a prerequisite for assessing the spatio-temporal dynamics of biological invasions, their invasive potential, and the magnitude of their impacts. However, with the exception of first records on a country level or wider regions, observations of species presence tend to remain unpublished, b...
Article
Full-text available
Very little is known about the marine macroalgae of artificial reefs—especially in the North Atlantic—despite the growing number and extent of man-made structures in the sea, and even though seaweed communities have paramount importance as primary producers, but also as feeding, reproductive and nursery grounds in coastal ecosystems. This paper exp...
Article
Full-text available
1. The disproportionately low presence of marine species in the list of invasive alien species (IAS) of Union concern of the European Union (EU) Regulation 1143/2014 does not fully acknowledge the threat they pose to the EU marine environment. 2. In this study, the first EU-scale Horizon Scanning (HS) focusing on marine alien species was performed,...
Article
Full-text available
Shipping is the greatest pathway of non-indigenous species (NIS) introductions, and port areas are considered as alien hotspots. In this study, we analyzed data covering a 112-year period and found that Saronikos Gulf in Greece, hosting one of the largest container port terminals in Europe, is a hotspot of NIS introductions. To date, 89 NIS have be...
Article
Full-text available
This paper is a collection of novel distributional records of 20 species belonging to 8 phyla (Chlorophyta, Rhodophyta, Cni-daria, Ctenophora, Annelida, Mollusca, Arthropoda and Chordata) from 11 Mediterranean countries, namely, Spain: an additional record of the Canary dentex Dentex canariensis is reported from Spain (Valencia), this is the northe...
Poster
Full-text available
The variation of photophilic macroalgae functional metrics (unit richness, % coverage, Shannon-Weaver Index, cluster analysis of Bray–Curtis similarity) at Ecological Status Group (ESGI, IA, IB, IC, ESGII, IIA, IIB) level, as well as the variation of the Ecological Evaluation Index (EEI-c) were studied at different spatial (sampling site, location,...
Article
Full-text available
Parts of the macroalgal flora of the eastern Mediterranean remain incompletely known. This applies in particular to the circalittoral communities. This study, based upon 2 cruises in the Ionian and Aegean Seas, surveyed benthic communities from 40 to 150 m depth by remotely-operated vehicle (ROV) with a special focus on detecting communities of the...
Technical Report
Full-text available
Invasive Alien Species (IAS) represent a major threat to the biodiversity in Europe and worldwide, and can cause significant damages to the ecology, economy and livelihood of recipient countries. Recognising the need for a coordinated set of actions for the prevention, early eradication and management of IAS, the European Parliament and the Council...
Article
An updated checklist of the red seaweeds (Rhodophyta), excluding the order Ceramiales, of the Greek coasts is provided, based on literature records, critically reviewed from present-day taxonomic and nomenclatural aspects. The total number of genera, species and infraspecific taxa currently accepted is 78, 138 and 4 respectively. The occurrence of...
Article
Full-text available
Amplified by the phenomenon of globalisation, such as increased human mobility and the worldwide shipping of goods, we observe an increasing spread of animals and plants outside their native habitats. A few of these 'aliens' have negative impacts on their environment, including threats to local biodiversity, agricultural productivity, and human hea...
Article
Full-text available
Time lags in non-indigenous species (NIS) reporting can create uncertainty in the analysis of NIS introduction rates, which can lead to inadequate actions, prevention measures and their evaluation. The present study aims to highlight time lags in marine NIS reporting in the Mediterranean Sea, i.e.: the time that mediates from the detection of a new...
Article
Full-text available
Refined baseline inventories of non-indigenous species (NIS) are set per European Union Member State (MS), in the context of the Marine Strategy Framework Directive (MSFD). The inventories are based on the initial assessment of the MSFD (2012) and the updated data of the European Alien Species Information Network, in collaboration with NIS experts...
Article
Full-text available
Standardized tools are needed to identify and prioritize the most harmful non-native species (NNS). A plethora of assessment protocols have been developed to evaluate the current and potential impacts of non-native species, but consistency among them has received limited attention. To estimate the consistency across impact assessment protocols, 89...
Technical Report
Full-text available
The current EU geographical distribution of the species listed in the 1st update (Commission Implementing Regulation 2017/1263) of the Invasive Alien Species (IAS) of Union concern (IAS Regulation 1143/2014) is set, based on the best available knowledge, resulting from an assessment of data aggregated through the European Alien Species Information...
Article
The brown algal genus Lobophora is widely reported from the Mediterranean Sea. Contrary to studies in the Indo-Pacific and Caribbean regions, little attention has been given to Lobophora in the Mediterranean Sea, at least using molecular tools. To address this knowledge gap, we sampled speci- mens across the Mediterranean Sea (Spanish coast, Balear...
Article
Full-text available
Elodea nuttallii is an invasive plant widely distributed in many European freshwater habitats. The species has been recently added to the list of invasive alien species of Union concern (European Union (EU) Regulation 1143/2014). We aim to investigate the species’ potential distribution across the EU to provide a scientific basis for preventing fur...
Article
Full-text available
There is no sign of saturation in accumulation of alien species (AS) introductions worldwide, additionally the rate of spread for some species has also been shown to be increasing. However, the challenges of gathering information on AS are recognized. Recent developments in citizen science (CS) provide an opportunity to improve data flow and knowle...
Article
Full-text available
This work presents a current (2018) annotated list of marine NIS and cryptogenic species in Greek marine waters. For this purpose, we updated information from previous lists, included new data from several new NIS and cryptogenic records and recent taxonomic studies, and followed current taxonomic modifications for the alien/cryptogenic status of s...
Article
Full-text available
Seaweeds are affected by humans worldwide, although no studies have assessed this in Cyprus. The Water Framework Directive requires ecological assessments of European coastal waters with biological indicators. We investigated macroalgal community metrics in the upper subtidal across ca 10 km of shoreline, encompassing undeveloped areas with limited...
Article
Full-text available
Benthic macrophytes (macroalgae and angiosperms) are proposed as biological elements to assess the ecological status of coastal and transitional waters within the EU Water Framework Directive. In the present paper, a sampling of benthic macrophytes was made from 0-5 m depth at 25 different sites of the Sea of Marmara (Turkey) in 2015 and the Marine...
Poster
Full-text available
Introduction/Aim: Within the last decades several Artificial Reefs (ARs) have been deployed in the European seas as a measure for the enhancement of fish stocks and to a lesser extent for the protection and enhancement of seabed habitats (Fabi et al. 2011). The “HCMR Recreational Diving OasisTM” constitutes an innovative concept based on the constr...
Article
Full-text available
The mitochondrial genetic diversity, distribution and invasive potential of multiple cryptic OTUs of the red invasive seaweed Asparagopsis were assessed by studying introduced Mediterranean and Hawaiian populations. Invasive behavior of each Asparagopsis OTU was inferred from phylogeographic reconstructions, past historical demographic dynamics, re...
Article
Full-text available
In this study, we have performed a large-scale assessment on the native distribution range of the marine non-indigenous species (NIS) found in at least one of the European Seas (Mediterranean, NE Atlantic Ocean, Black, Baltic Sea). As a basis, we have used the most updated pan-European NIS inventory, provided by the European Alien Species Informati...
Article
Full-text available
Invasive Alien Species (IAS) are a growing threat to Europe's biodiversity. The implementation of European Union Regulation on IAS can benefit from the involvement of the public in IAS recording and management through Citizen Science (CS) initiatives. Aiming to tackle issues related with the use of CS projects on IAS topics, a dedicated workshop ti...
Article
Full-text available
Building and managing large datasets of alien species is crucial to research, management, and control of biological invasions. To this end, the European Alien Species Information Network (EASIN) platform aggregates, integrates, and harmonizes spatio-temporal data regarding alien species in Europe, including both invasive and non-invasive alien spec...
Article
Full-text available
Introduced Marine Pests (IMP, = non-indigenous marine species) prevention, early detection and risk-based management strategies have become the priority for biosecurity operations worldwide, in recognition of the fact that, once established, the effective management of marine pests can rapidly become cost prohibitive or impractical. In Western Aust...
Article
Full-text available
This paper provides a comprehensive checklist of the marine benthic macroalgal flora of Ascension Island (tropical South Atlantic Ocean), based on both new collections and previous literature. 82 marine macroalgae were identified from our work, including 18 green algae (Ulvophyceae), 15 brown algae (Phaeophyceae) and 49 red algae (Rhodophyta). Amon...
Technical Report
Full-text available
An EU geographical distribution of the 37 Invasive Alien Species (IAS) of Union concern (published in the Commission Implementing Reg. 1141/2016) is set through a Science for Policy Report, based on the best available knowledge. This report is the result of an assessment of occurrence and distribution data aggregated through EASIN data partners su...
Article
Full-text available
The adoption of a consistent alien species pathways categorization, hierarchy and terminology is crucial for increasing the interoperability of different online databases. In the present paper the European Alien Species Information Network (EASIN) classification system of pathways is compared and discussed with the classification scheme recently pu...
Technical Report
Full-text available
Tackling alien species (AS) demands international collaboration, harmonization and sharing of data. The European Alien Species Information Network (EASIN) is committed to this aim, as the official information system assisting the European Commission and the European Union (EU) Member States with the implementation of the EU Regulation 1143/2014 on...
Article
An updated checklist of the red seaweeds (Rhodophyta) of the Order Ceramiales of the Greek coasts is provided, based on literature records, critically reviewed from present-day taxonomic and nomenclatural aspects. The total number of genera, species and infraspecific taxa currently accepted is 60, 118 and 2, respectively. The occurrence of each tax...
Article
Full-text available
Since 2010, a bottom-up initiative has been launched in Santorini Island (Aegean Sea, Eastern Mediterranean) for the establishment of the first fully protected marine protected area in the Cyclades, aiming at improving fisheries and enhancing responsible recreational uses at sea. Following discussions with local small-scale fishermen and divers, tw...
Article
Full-text available
The European Alien Species Information Network (EASIN) aims to facilitate the exploration of alien species information in Europe, and is recognized as the information system supporting European Union Member States in the implementation of the recently published Invasive Alien Species Regulation. In this paper, we present the role and activities of...
Article
Six macroalgal species are reported as new or confirmed for the Aegean coasts of Greece (Eastern Mediterranean) thereby extending their distribution range: the brown alga Asperococcus ensiformis, and the red algae Chondria boryana, Dipterosiphonia dendritica, Gelidium pulchellum, Neosiphonia harveyi, and Taenioma nanum. Of particular interest are t...
Article
Full-text available
Subantarctic and Antarctic regions remain little explored with regards to their seaweed diversity. This study is based upon collections in the early 1970s and 2007–2013. It is supported by sequencing COI (mitochondrial cytochrome oxidase I) and reports new records for four species of brown algae (Hincksia granulosa, Hincksia sandriana, Myriotrichia...