Nicholas Koutsikos
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View article: First Record of Silurus aristotelis Garman, 1890 in Schinias Olympic Rowing and Canoeing Center (Schinias National Park, Attica, Greece)
First Record of Silurus aristotelis Garman, 1890 in Schinias Olympic Rowing and Canoeing Center (Schinias National Park, Attica, Greece) Open
This study reports the presence of the endangered endemic Aristotle’s catfish (Silurus aristotelis Garman, 1890) outside of its natural distribution and within the Schinias National Park (Attica Region, Greece), based on morphometric and m…
View article: Global Patterns and Drivers of Freshwater Fish Extinctions: Can We Learn From Our Losses?
Global Patterns and Drivers of Freshwater Fish Extinctions: Can We Learn From Our Losses? Open
Nearly one‐third of extant freshwater fish species, which account for over 50% of global fish diversity, are at risk of extinction. Despite their crucial ecological and socioeconomic importance, the extinction of freshwater fishes remains …
View article: Anthropogenic influences reshape lentic fish diversity: Patterns of homogenization and differentiation across a Mediterranean biodiversity hotspot
Anthropogenic influences reshape lentic fish diversity: Patterns of homogenization and differentiation across a Mediterranean biodiversity hotspot Open
Freshwater ecosystems are increasingly impacted by human activities, resulting in species invasions and extinctions, disrupting biodiversity and ecosystem functions. This study investigates the patterns of taxonomic and functional homogeni…
View article: Questionnaire improvements in second-generation, multilingual decision support tools for invasion risk screening of non-native taxa
Questionnaire improvements in second-generation, multilingual decision support tools for invasion risk screening of non-native taxa Open
As a result of the increasing threats posed by non-native species invasions, there has been a rise in the demand for decision support tools that can more efficiently identify those non-native species likely to become invasive. As part of t…
View article: To be, or not to be, a non-native species in non-English languages: gauging terminological consensus amongst invasion biologists
To be, or not to be, a non-native species in non-English languages: gauging terminological consensus amongst invasion biologists Open
In invasion biology, terminological frameworks contribute to the improvement of effective communication among scientists, stakeholders, and policy-makers. This is important not only for informing policy decisions but also for engaging the …
View article: Short‐term effects of Storm Daniel on <i>Salmo farioides</i> (Karaman, 1938) in a high‐gradient stream
Short‐term effects of Storm Daniel on <i>Salmo farioides</i> (Karaman, 1938) in a high‐gradient stream Open
Climate change is expected to increase the magnitude, frequency, and intensity of extreme natural phenomena such as droughts and floods. These events can have devastating impacts on aquatic biota, thus there is a dire need to assess specie…
View article: Quietly invading the Balkans: Economidichthys pygmaeus (Holly, 1929) (Gobiidae) established in Northeastern Greece
Quietly invading the Balkans: Economidichthys pygmaeus (Holly, 1929) (Gobiidae) established in Northeastern Greece Open
This study reports on a new translocated population of the Western Greece Goby (Economidichthys pygmaeus Holly, 1929) within the Thrace freshwater ecoregion in Northeastern Greece, approximately 370 km east of the species' native range (Io…
View article: Nationwide Tracing of Two Top Freshwater Fish Invaders in Greece Using Environmental DNA Sampling
Nationwide Tracing of Two Top Freshwater Fish Invaders in Greece Using Environmental DNA Sampling Open
Alien fish invasions are causing devastating impacts on native freshwater fauna; thus, rigorous, non-invasive and cost-effective biomonitoring of lotic and lentic freshwaters to design and implement appropriate prevention and control measu…
View article: Non-Indigenous Freshwater Fishes as Indicators of Ecological Quality in Running Waters
Non-Indigenous Freshwater Fishes as Indicators of Ecological Quality in Running Waters Open
The European Union Water Framework Directive (WFD) is a comprehensive initiative guiding river basin water management, addressing pressures such as pollution from diffuse and point sources, and hydromorphological alterations. However, pres…
View article: Exploring fish functional trait assemblages in Eastern Mediterranean rivers: a study across multiple scales using network analysis
Exploring fish functional trait assemblages in Eastern Mediterranean rivers: a study across multiple scales using network analysis Open
Functional traits of river fish assemblages have rarely been studied in the Eastern Mediterranean region. A dataset of 254 Greek electrofished near-natural sites (427 samples) was analyzed to explore native fish functional structure across…
View article: Fish Assemblages as Ecological Indicators in the Büyük Menderes (Great Meander) River, Turkey
Fish Assemblages as Ecological Indicators in the Büyük Menderes (Great Meander) River, Turkey Open
This research describes fish assemblages and associated aquatic ecosystem degradation patterns in the Büyük Menderes River, one of Turkey’s most important Anatolian basins. Using standard electrofishing, 44 river sites were sampled through…
View article: Non-indigenous freshwater fish research in Greece: Current status and future prospects
Non-indigenous freshwater fish research in Greece: Current status and future prospects Open
Many studies around the globe have documented that the introduction of non-indigenous fish species (NIFS) may pose severe impacts on native biota, ecosystem functioning, and ecosystem services. In Greece, publications on NIFS have increase…
View article: Patterns of Spatial Overlap between Non-Indigenous and Critically Endangered Freshwater Fishes from a Mediterranean Biodiversity Hotspot
Patterns of Spatial Overlap between Non-Indigenous and Critically Endangered Freshwater Fishes from a Mediterranean Biodiversity Hotspot Open
Non-indigenous fish species (NIFS) can cause severe ecological impacts on the invaded ecosystems and are considered as one of the leading factors of freshwater biodiversity loss. Unraveling the spatial overlap between NIFS and critically e…
View article: Rivers and Wastewater-Treatment Plants as Microplastic Pathways to Eastern Mediterranean Waters: First Records for the Aegean Sea, Greece
Rivers and Wastewater-Treatment Plants as Microplastic Pathways to Eastern Mediterranean Waters: First Records for the Aegean Sea, Greece Open
The present work provides the first records on microplastic (MP) amounts and types in rivers and wastewater effluents entering the Aegean Sea, eastern Mediterranean. Two rivers were sampled using a manta net (mesh size, 0.33 mm): a small u…
View article: Overlapping Areas of Non-Indigenous and Critically Endangered Freshwater Fishes: Setting Conservation Priorities in Greece &lt;sup&gt;†&lt;/sup&gt;
Overlapping Areas of Non-Indigenous and Critically Endangered Freshwater Fishes: Setting Conservation Priorities in Greece <sup>†</sup> Open
The introduction of non-indigenous fish species (NIFS) to freshwater ecosystems is considered as one of the leading factors associated with freshwater biodiversity loss. Unravelling the spatial overlap between NIFS and critically endangere…
View article: Risk of invasiveness of non-native aquatic species in the eastern Mediterranean region under current and projected climate conditions
Risk of invasiveness of non-native aquatic species in the eastern Mediterranean region under current and projected climate conditions Open
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 …
View article: Impacts of the alien mosquitofish on the abundance and condition of two Mediterranean native fish
Impacts of the alien mosquitofish on the abundance and condition of two Mediterranean native fish Open
The rapid decline of the Greek native Valencia letourneuxi, and its recently described sister species Valencia robertae, has been often attributed to habitat degradation, as well as aggression from or resource competition with the alien mo…
View article: Global distribution and climatic match of a highly traded ornamental freshwater fish, the sailfin molly<i>Poecilia latipinna</i>(Lesueur, 1821)
Global distribution and climatic match of a highly traded ornamental freshwater fish, the sailfin molly<i>Poecilia latipinna</i>(Lesueur, 1821) Open
Predicting alien species' establishment through climate matching may inform management actions preventing future invasions. The aim of the current study was to evaluate the climate match of the sailfin molly ( Poecilia latipinna ) worldwid…
View article: First confirmed record of an established population of sailfin molly, Poecilia latipinna (Actinopterygii: Cyprinodontiformes: Poeciliidae), in Europe
First confirmed record of an established population of sailfin molly, Poecilia latipinna (Actinopterygii: Cyprinodontiformes: Poeciliidae), in Europe Open
The ornamental aquarium trade has been responsible for several introductions of non-indigenous species in freshwater ecosystems. This report confirms the presence of an established non-native molly population in a tectonic, brackish, geoth…
View article: Developing policy-relevant river fish monitoring in Greece: Insights from a nation-wide survey
Developing policy-relevant river fish monitoring in Greece: Insights from a nation-wide survey Open
A wide-ranging river fish survey was executed in the summer of 2009 as part of the preparatory actions for the establishment of a monitoring programme for the EU Water Framework Directive (WFD). This was the first extensive electrofishing …