Ahmet E. Kideys

Ahmet E. Kideys
Middle East Technical University | METU · Institute of Marine Sciences

Professor

About

120
Publications
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2,663
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Publications

Publications (120)
Article
Full-text available
Turkey is one of the major plastic pollution sources in the Mediterranean and the Black Sea. This review summarizes present information, data, and legislation on plastic pollution in Turkish aquatic ecosystems. According to results derived from reviewed studies, both macro and microplastic pollution were documented in Turkish aquatic ecosystems. Mo...
Article
Full-text available
Calanoid copepods with different life cycle strategies demonstrate varied velocity in the utilization of energy resources during starvation. Tis study analyzes the influence of multiday starvation on the rate of total, basal and active energy metabolism in adult females of two Marmara Sea and one Baltic Sea species of copepods; epiplanktonic Acartia...
Article
Full-text available
Gelatinous zooplankton (GZ) populations are sensitive to climate change such as environmental perturbations, and spatial changes in their abundance and biomass may be associated with degraded environmental and biota conditions. Big data time series of GZ abundances and biomass were used to analyze the annual population dynamics of gelatinous zoopla...
Article
Full-text available
Wastewater treatment plants (WWTPs) are one of the major vectors of microplastics (MPs) pollution for the recipient water bodies. Therefore, the recovery of MPs from WWTPs is extremely important for decreasing their accumulation and impact in aquatic systems. In this present study, the electrocoagulation-electroflotation (EC/EF) and membrane filtra...
Article
Levels, composition and fate of microplastics (MPs) were investigated along different compartments of a secondary wastewater treatment plant (WWTP) with nutrient removal on the northern Sea of Marmara coast (Istanbul, Turkey). When all samples were combined, fibers were found to be the most dominant particles, followed by hard fragments. 500–1000 μ...
Article
Full-text available
Riverine systems act as converging pathways for discarded litter within drainage basins, becoming key elements in gauging the transfer of mismanaged waste into the ocean. However, riverine litter data are scarce and biased towards microplastics, generally lacking information about larger items. Based on the first ever database of riverine floating...
Article
Multi-day experiments were carried out with two Marmara Sea calanoid copepod species: Acartia clausi and Centropages typicus, to assess the possible role of the type of feeding on the consumption of microplastics and its influence on the rate of energy metabolism of these species. In a mixture of microplastic beads (6μm diameter) and algae Rhodomon...
Article
Full-text available
Consumption rates of polystyrene microplastics (beads of 6, 12, and 26 μm diameter) and their effects on energy metabolism and motor activity of the copepod Calanus helgolandicus living in the Marmara Sea were investigated. All sizes of microplastic particles were actively consumed and excreted via fecal pellets, however, copepods displayed a signi...
Article
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Environmental Protection Agencies (EPAs) have been involved in citizen science initiatives for decades, engaging with citizens with the goal of protecting and restoring our environment. Yet the data and knowledge generated and the possibilities for engaging citizens have grown significantly in the last decades thanks to the recent developments in m...
Article
Copious quantities of microplastics enter the sewage system on a daily basis, and hence wastewater treatment plants (WWTPs) could be an important source of microplastic pollution in coastal waters. Influent and effluent discharges from three WWTPs in Mersin Bay, Turkey were sampled at monthly intervals over a one-year period during 2017. When data...
Article
Full-text available
We tested for the first time the efficiency of the use of infra-red (IR) cameras for sea turtle hatchling monitoring. The cameras were installed on one green turtle (Chelonia mydas) and four loggerhead turtle (Caretta caretta) nests during 2014 and 2015 nesting season in the southeast Mediterranean, Turkey. The camera monitoring, even with the limi...
Technical Report
Full-text available
The JRC exploratory project RIMMEL provides information about litter, mainly plastic waste, entering the European Seas through river systems. RIMMEL has collected data on riverine floating macro litter inputs to the sea. Data acquisition was based on the Riverine Litter Observation Network (RiLON) activities, which collected data from rivers in the...
Conference Paper
Full-text available
Microplastic particles are now found throughout the world's oceans. Recent studies have shown that these particles can be ingested by zooplankton species and later egested within their fecal pellets, which lead to spreading of the microplastic along the food web. This study investigated ingestion, egestion and effects of microplastic on the metabol...
Article
Among aquatic organisms, fish are particularly susceptible to ingesting microplastic particles due to their attractive coloration, buoyancy, and resemblance to food. However, in previous experimental setups, fish were usually exposed to unrealistically high concentrations of microplastics, or the microplastics were deliberately contaminated with pe...
Article
Full-text available
This volume contains the main results of the EC FP7 “The Ocean of Tomorrow” Project CoCoNet, divided in two sections: 1) a set of guidelines to design networks of Marine Protected Areas in the Mediterranean and the Black Seas; 2) a smart wind chart that will allow evaluating the possibility of installing Offshore Wind Farms in both seas. The concep...
Presentation
Mediterranean tapeweed (Posidonia oceanica), a species of seagrass, and sand lily (Pancratium maritimum) are endangered angiosperms native to the Mediterranean Sea. The cascading effects of change in the Turkey ecosystem, originating from direct and indirect human impacts, are maintaining a loss of seagrasses in shallow marine waters and of sand li...
Article
Full-text available
The monthly abundance, biomass and taxonomic composition of zooplankton of cape Sinop (the southern Black Sea) were determined from 2002 to 2004. Samplings of zooplankton were carried out vertically at monthly intervals using standard type plankton net (210 m mesh size and 50 cm diameter mouth opening). In the present study, a total of 25 zooplank...
Data
The abundances, biomasses, and population structures of two introduced ctenophore species— Mnemiopsis leidyi and Beroe ovata— were monitored along with mesoplankton in the near-shore waters of the northern Black Sea (Sevastopol Bay and adjacent regions) over a period of four years (2000–2003), after the B. ovata invasion. The annual dynamics of the...
Conference Paper
Full-text available
SEASONALITY OF MESOZOOPLANKTON IN THE SOUTHERN BLACK SEA (OFF SİNOP) DURING 2002-2004 ASBTRACT In the present study, the monthly abundance, biomass and taxonomic composition of zooplankton of Sinop Inner Harbor (the southem Black Sea) were determined during 2002-2004. Samplings of zooplankton were carried out vertically at monthly intervals using a...
Presentation
Cataloguing the biodiversity of life in earth is not a simple task. We still know only a minor fraction (10-15%) of life’s diversity and current taxonomic methods may be inadequate or too slow to capture and manage biodiversity. This percentage is expected to be lower for marine taxa. Biodiversity in the oceans was recently estimated at just about...
Conference Paper
Abstract For understanding emergence behaviour of turtle hatchlings, one of the ten Chelonia mydas (green sea turtle) nests, produced during nesting season 2014 at a beach in the northeastern Mediterranean (Erdemli, Turkey) was surveyed during nesting hatching period, using an infra-red (IR) camera. After hatching the nest was excavated for the an...
Conference Paper
Full-text available
Plastics are globally favoured as raw materials due to their low cost, lightweight, durability and hydrophobicity compared to other industrial materials. Turkey is currently one of the top five producers of plastic materials with a 13.7% share in the European plastic material industry, the second largest producer of plastics in the World. Besides t...
Article
Full-text available
The Cilician Basin located in the Northeastern Mediterranean is a region that is affected by a diversity of anthropogenic pressures and is further expected to suffer from negative economic, environmental and social impacts of coastal litter. To provide a baseline for litter management plans, the standing crop of coastal macro-litter was sampled on...
Poster
P. oceanica is a seagrass species performing key ecosystem functions and endemic to Mediterranean coasts. Both direct and indirect anthropogenic factors are contributing to the global seagrass loss which reached to a level of 5% per year today (Marba et al. 2005). This rate is increasing as a nonlinear process with cascading effects, and the recove...
Conference Paper
Coastal litter is recognized as a multi-scale problem with ecological, economic and social dimensions. Studies addressing the effect of coastal litter in Turkey highlight its economic harm to the tourism industry. In order to reduce or avoid both economic and ecological damage caused by coastal litter on the one hand and to comply with the aim of t...
Data
Full-text available
Marine living resources are diminishing in the Turkish Black Sea whilst marine biological diversity is facing various threats from overfishing as well as illegal, unreported or unregulated fishing, pollution -both vessel and land-based, alien species, marine litter, and climate change. The designation of Marine Protected Areas (MPAs) will greatly i...
Article
Marine living resources are diminishing in the Turkish Black Sea whilst marine biological diversity is facing various threats from overfishing as well as illegal, unreported or unregulated fishing, pollution - both vessel and land-based, alien species, marine litter, and climate change. The designation of Marine Protected Areas (MPAs) will greatly...
Article
Full-text available
Mnemiopsis leidyi population activities first were recorded during the coastal observations in 2001 in which its population considerably increased afterward and now sustained the southern Caspian Sea. Maximum summer-autumn M. leidyi abundance was recorded in euphotic layer in 2002 (851±85 ind. m-3) and maximum biomass was in 2001 with 48.1±14.4 g....
Data
Total lipids in anchovy and sprat were measured and interpreted as indicators of their nutritional condition and food supply for the period 2005 to 2010. High lipid content in anchovies suggested that they were able to found sufficient food and favorable environmental condition supporting their stock biomass on a certain level which was strongly li...
Article
Full-text available
Total lipids in anchovy and sprat were measured and interpreted as indicators of their nutritional condition and food supply for the period 2005 to 2010. High lipid content in anchovies suggested that they were able to found sufficient food and favorable environmental condition supporting their stock biomass on a certain level which was strongly li...
Article
Full-text available
A specific marine biological data management tool, the Black Sea Mnemiopsis leidyi database system was created within the European Commission 6th framework Black Sea SCENE project for the Black Sea region and is now being supported by the Permanent Secretariat of the Black Sea Commission. The core team of scientists studying M. leidyi in the Black...
Article
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Recent data on the fat content and abundance of sprat and anchovies are considered here along with data related to sea temperatures and phytoplankton biomass. Findings showed that significant changes in fish conditions were strongly related to environmental factors.
Article
Full-text available
Monitoring for 6years (2001–2006) showed that the population explosion of the alien ctenophore Mnemiopsis leidyi in the southern Caspian Sea coincided with a decline in the abundance and species number of mesozooplankton. While this decline appeared to have reduced the nourishment of sprat (also known as kilka), it seemed to have affected phytoplan...
Article
Full-text available
We investigated how stenohalinic Black Sea Calanus euxinus, when migrating to the north-eastern Marmara Sea, can adapt to the pronounced salinity gradient there. During field observations (2005 to 2008) females of Calanus euxinus with significantly smaller body length (compared with those inhabiting the brackish Black Sea at 17 to 18 psu) were foun...
Article
Full-text available
Temporal and spatial changes in abundance, prosome length, oil sac volume, molting patterns and morphometric parameters were studied in Calanus euxinus from the Black and Marmara Seas. In the south-western part of the Black Sea and deep shelf zone near Sinop the abundance of C. euxinus was high during the whole studied period (2000–2005), with a...
Article
Full-text available
In copepodites and adults of Calanus euxinus abundance, body length and weight, chemical composition and respiration rate in relation to age were studied during the cruise of R/V ‘Knorr’ in April 2003 in the southwestern Black Sea and in laboratory experiments. Data on morphology and physiology of C. euxinus collected during other seasons were also...
Article
Full-text available
TROPHIC RELATIONSHIPS AND FOOD SUPPLY OF HETEROTROPHIC ANIMALS IN THE PELAGIC ECOSYSTEM OF THE BLACK SEA Editors: G. E. Shulman B. Ozturk A. E. Kideys G. A. Finenko L. Bat Commission on the Protection of the Black Sea against Pollution 2009 Preface During recent decades, the Black Sea has been affected by many negative factors that strongly...
Article
The invasive ctenophore Mnemiopsis leidyi (Agassiz), which was transported from the Black Sea into the Caspian Sea at the end of the 1990s, has negatively affected the ecosystem of the Caspian Sea. Zooplankton abundance, biomass and species composition were evaluated on the Iranian coast of the Caspian Sea during 2001–2006. A total of 18 merozoopla...
Article
Full-text available
Physiological and biochemical methods are important tools for solving certain fishery problems, such as observed trends of fish distribution and migrations; estimation of productivity of commercial species; indicators and monitoring of stock condition and separating populations. In the review, major results of related long-term studies are presente...
Conference Paper
Full-text available
In the present study, seasonality and composition of phytoplankton and zooplankton were comparatively studied at two stations (one inshore and one offshore) off Sinop, in southern Black Sea during January-May 1999 and March-October 2000. A total 76 genera including 149 species and varieties were identified, of which 46% were dinoflagellates and 34%...