Browsing by Author "Evcen A."

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Coralligenous assemblages along their geographical distribution: Testing of concepts and implications for management
    (John Wiley and Sons Ltd, 2020) Çinar M.E.; Féral J.-P.; Arvanitidis C.; David R.; Taşkin E.; Sini M.; Dailianis T.; Doğan A.; Gerovasileiou V.; Evcen A.; Chenuil A.; Dağli E.; Aysel V.; Issaris Y.; Bakir K.; Nalmpantı M.; Sartoretto S.; Salomidi M.; Sapouna A.; Açik S.; Dimitriadis C.; Koutsoubas D.; Katağan T.; Öztürk B.; Koçak F.; Erdogan-Dereli D.; Önen S.; Özgen Ö.; Türkçü N.; Kirkim F.; Önen M.
    1.The coralligenous habitat was studied at the large Mediterranean scale, by applying a standardized, non-destructive photo-sampling protocol, developed in the framework of the CIGESMED project. 2.The results provided evidence to support the following statements: (a) the assemblage pattern is not homogeneously distributed across the four Mediterranean ecoregions studied (biotic gradients hypothesis); and (b) the assemblage pattern does not change significantly when the information is aggregated to higher taxonomic levels (taxonomic sufficiency hypothesis). 3.Surrogate taxonomic categories higher than species, such as genus and family, can be used to reveal the multivariate pattern of the coralligenous assemblages. 4.Although preliminary at the pan-Mediterranean scale, these outcomes set the scene for future comparisons as more data sets become available but also for comparisons between taxonomic and functional patterns. © 2020 John Wiley & Sons, Ltd.
  • No Thumbnail Available
    Item
    Integrated assessment of eutrophication in the southern Black Sea waters, using the Nested Environmental Status Assessment Tool
    (Elsevier Ltd, 2023) Tan I.; Atabay H.; Evcen A.; Kurt G.; Taşkın E.; Polat Beken Ç.
    This research deals with the land-based pressures on the southern Black Sea coast (Turkey), with the objective of assessing their eutrophication impacts. In this context, reference values of some of the eutrophication indicators were calculated, and eutrophication assessment was carried out for this area using the holistic approach NEAT (Nested Environmental Status Assessment Tool). In addition, correlations between NEAT results of coastal regions and pressure-impact analysis methods were investigated. In the determined Spatial Assessment Unit (SAU) areas, 9 indicators were evaluated according to the SAU surface, both with and without weighting by their size the overall assessment of the Turkish Black Sea coast is good (0.70) and moderate (0.57) environmental status, for non-weighting and weighting by SAUs, respectively, with a high confidence level. With this study, we concluded that the sensitivity of the assessment tool needs to be increased. Despite these results, an appropriate number of indicators to represent the water column should be added. It is important to include the phytoplankton variable in the evaluation in future studies. In addition, this study, which uses NEAT allows identifying problematic environmental areas that require attention and action from managers and policymakers. © 2023 Elsevier Ltd