Michail Ragkousis

Michail Ragkousis
University of the Aegean · Department of Oceanography and Marine Biosciences

BSc Marine Sciences MSc Marine Biology

About

17
Publications
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155
Citations

Publications

Publications (17)
Poster
Full-text available
Although marine caves are considered as biodiversity reservoirs, little is known about their mobile inhabitants. Thus, in the framework of the research program ALAS, both the abundance and species richness of mobile fauna were recorded at 12 marine caves across the Aegean Sea. A total of 14 alien species were recorded with higher abundance at the s...
Article
Full-text available
This Collective Article includes records of 29 alien and cryptogenic species in the Mediterranean Sea, belonging to eight Phyla (Rhodophyta, Ochrophyta, Cnidaria, Annelida, Mollusca, Arthropoda, Echinodermata, and Chordata) and coming from 11 countries. Notes published here can be divided into three different categories: occupancy estimation for wi...
Article
Full-text available
Data on the distribution and ecology of cryptobenthic fish of marine caves in the Mediterranean Sea are extremely scarce but necessary for scientists and marine managers alike in order to understand these fish’s ecological role and assess their conservation status. Broadscale surveys by implementing underwater visual census and photographic samplin...
Article
Full-text available
This article includes twenty (20) new records of alien and cryptogenic species in the Mediterranean Sea, belonging to six (6) Phyla (Rhodophyta, Tracheophyta, Mollusca, Arthropoda, Bryozoa, and Chordata) distributed from the Eastern Mediterranean to the Sea of Alboran. The records are reported from nine (9) countries and can be classified into two...
Article
Full-text available
Urocaridella pulchella Yokeş & Galil, 2006 is a palaemonid cleaner-shrimp of Indo-Pacific origin that was first described from the Mediterranean Sea in 2006. However, limited information is available about its distribution and ecology due to the small size and cryptic habit of the species. We hereby report the first records of U. pulchella in marin...
Article
Full-text available
This article includes 23 new records of alien and cryptogenic species in the Mediterranean Sea, belonging to 4 Phyla (Chordata, Echinodermata, Arthropoda and Mollusca), distributed from the Alboran to the Levantine Sea. Records are reported from eight countries listed from West to East as follows: Algeria: new records of the Atlantic blue crab Call...
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...
Data
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
Synaptula reciprocans was reported in the Mediterranean Sea for the first time back in 1986. Since then there have been numerous reports, following the species’ gradual expansion and establishment in the eastern Mediterranean basin. Here we report, by using citizen science methods, from the project titled “Is it Alien to you? Share it” of iSea, the...
Article
For the effective conservation of vulnerable marine populations, knowledge of their distributions and spatially-explicit management actions are essential. The use of physical features or coarse habitat types as surrogates of species distribution often does not provide an accurate enough, and hence useful, mapping of where species occur. This is fur...
Poster
Full-text available
The harbor porpoise (Phocoena phocoena) is one of the smallest species of cetaceans. They populate temperate and Arctic waters with large temperature fluctuations between seasons. Therefore, this is a marine mammal characterized by extreme blubber accumulations in preparation for cold winter conditions. As blubber has a smaller density than sea wat...
Poster
Full-text available
According to the Aichi Biodiverity Target 11 set by the Convention on Biological Diversity, states are committed to protect 10% of marine coastal areas by 2020. In line with this, the ultimate goal of the MARISCA project is to propose a network of Marine Protected Areas (MPAs) for the conservation of all important and vulnerable habitats and specie...
Article
Full-text available
This contribution forms part of a series of collective articles published regularly in Mediterranean Marine Science that report on new biodiversity records from the Mediterranean basin. The current article presents 51 geographically distinct records for 21 taxa belonging to 6 Phyla, extending from the western Mediterranean to the Levantine. The new...

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Projects

Projects (4)
Project
ALAS aims to fill knowledge gaps on the impacts of marine alien species in the Aegean Sea, and support marine managers and policy makers in prioritizing mitigation actions. ALAS will improve our knowledge base by (1) conducting a series of field experiments and surveys to investigate the impacts of selected invasive alien species on marine habitats, (2) producing high-resolution habitat maps in the coastal zone, refining the results of previous research efforts through fieldwork, remote sensing and satellite imaging, (3) producing species distribution models for all invasive species, based on extensive underwater surveys for the collection of new data and integrating all existing information.
Project
We made a model for buoyancy of harbour porpoises, based on tissue density, variation in tissue composition and variation of pressure/salinity in the water column. This model predicts the optimal foraging depths of porpoises in all live stages and throughout the year. To verify the model we are analysing data from D-tags, which report diving depth, acceleration and orientation. This will allow us to test at which depth animals experience zero buoyancy, a depth where they can change from active swimming to passive gliding. During the passive glides we can calculate de-acceleration and thereby buoyancy.