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Existing literature on dolphin-fisheries interaction focused on Greece reveals both an undeveloped area for research, but also a lack of relevant data in this field. Although imperative, relevant research has been slow on innovation and cooperation among universities, official bureaus, and NGOs that are obliged to work together as European and national laws dictate. Most of the research in this new field focuses on the interaction between marine mammals and local fisheries, suggesting that this relationship may be problematic for both parties since the former are being treated (at least occasionally) with brutality, while the latter try to deal with economic loss. Dolphins and fishermen operate within the same ecological niches for their survival, the main area of conflict being nutritious fish. Anthropological research on ethnic identity has long dealt with antagonistic relationships over resources between adjacent groups of people. Marine biologists’ research in Greece focuses on the human factor, and some of its shortcomings may well be seen as the result of limited, or an absence of, training in social sciences. This article attempts to draw from anthropological theory to shed light on a particular symbiosis between humans and dolphins. Multidisciplinary approaches gain ground in a wide range of research interests and seem to be fruitful in terms of theoretical and practical results.
Stergios Pardalis; Anastasia Komnenou; Athanasios Exadactylos; Georgios Gkafas. Small Scale Fisheries, Dolphins and Societal Challenges: A Case Study in the City of Volos, Greece. Conservation 2021, 1, 81 -90.
AMA StyleStergios Pardalis, Anastasia Komnenou, Athanasios Exadactylos, Georgios Gkafas. Small Scale Fisheries, Dolphins and Societal Challenges: A Case Study in the City of Volos, Greece. Conservation. 2021; 1 (2):81-90.
Chicago/Turabian StyleStergios Pardalis; Anastasia Komnenou; Athanasios Exadactylos; Georgios Gkafas. 2021. "Small Scale Fisheries, Dolphins and Societal Challenges: A Case Study in the City of Volos, Greece." Conservation 1, no. 2: 81-90.
The distribution and abundance of three Delphinidae species (striped dolphin, bottlenose dolphin, and common dolphin) were investigated in an extended area of the Mediterranean Sea. Data from nondesigned transect line surveys were modeled in order to investigate important marine areas for marine mammals. The results indicated that the environmental covariates significantly affecting marine mammals’ distribution/abundance were depth and distance from 200 m isobaths for striped dolphin, latitude/longitude and depth for bottlenose dolphin, and latitude/longitude and chlorophyll concentration for common dolphin. Maps of predictions were designed in order to communicate the results of important hot spot areas throughout the Mediterranean. Monitoring of Delphinidae species population patterns in the Mediterranean Sea was carried out in a sequence of surveys employing different approaches. Data from seven-year surveys with small catamaran sailing boats were analyzed under model-based approaches. Density Surface Models were used to produce spatial distribution prediction of three Delphinidae species (Stenella coeruleoalba, Tursiops truncatus, and Delphinus delphis) in an extended study area covering much of the Mediterranean Sea. A classical distance sampling protocol was applied in order to calculate the detection probability of clusters. Static (depth, slope, distance from the coast, and distance from isobaths of 200 m) and nonstatic (sea surface temperature and chlorophyll) variables were used to predict the species distribution/abundance in a generalized additive model context. Stenella coeruleoalba was found to be the dominant species, with an extended distribution in the study area; its abundance was significantly affected by both depth and distance. Tursiops truncatus and Delphinus delphis illustrated a significant abundance correlation with depth and chlorophyll, respectively, while both species showed a robust longitude correlation. Our model pinpoints the significance of nondesigned transect line surveys, suggesting the importance of specific habitat areas for future monitoring and conservation aspects of marine mammals.
Grigorios Karamitros; Georgios A. Gkafas; Ioannis A. Giantsis; Petros Martsikalis; Menelaos Kavouras; Athanasios Exadactylos. Model-Based Distribution and Abundance of Three Delphinidae in the Mediterranean. Animals 2020, 10, 260 .
AMA StyleGrigorios Karamitros, Georgios A. Gkafas, Ioannis A. Giantsis, Petros Martsikalis, Menelaos Kavouras, Athanasios Exadactylos. Model-Based Distribution and Abundance of Three Delphinidae in the Mediterranean. Animals. 2020; 10 (2):260.
Chicago/Turabian StyleGrigorios Karamitros; Georgios A. Gkafas; Ioannis A. Giantsis; Petros Martsikalis; Menelaos Kavouras; Athanasios Exadactylos. 2020. "Model-Based Distribution and Abundance of Three Delphinidae in the Mediterranean." Animals 10, no. 2: 260.
The authors wish to make the following corrections to this paper
Athanasios Exadactylos; Dimitrios Vafidis; Costas S. Tsigenopoulos; Georgios A. Gkafas. Addendum: Exadactylos, A., et al. High Connectivity of the White Seabream (Diplodus sargus, L. 1758) in the Aegean Sea, Eastern Mediterranean Basin. Animals 2019, 11, 979. Animals 2019, 9, 1152 .
AMA StyleAthanasios Exadactylos, Dimitrios Vafidis, Costas S. Tsigenopoulos, Georgios A. Gkafas. Addendum: Exadactylos, A., et al. High Connectivity of the White Seabream (Diplodus sargus, L. 1758) in the Aegean Sea, Eastern Mediterranean Basin. Animals 2019, 11, 979. Animals. 2019; 9 (12):1152.
Chicago/Turabian StyleAthanasios Exadactylos; Dimitrios Vafidis; Costas S. Tsigenopoulos; Georgios A. Gkafas. 2019. "Addendum: Exadactylos, A., et al. High Connectivity of the White Seabream (Diplodus sargus, L. 1758) in the Aegean Sea, Eastern Mediterranean Basin. Animals 2019, 11, 979." Animals 9, no. 12: 1152.
Population dynamics in the marine realm can shape species’ spatial structure and genetic variability between given geographical areas. Connectivity is an important factor of species’ population structure. In this study, we examined the genetic diversity and structure of white seabream (Diplodus sargus, L. 1758) in the eastern Mediterranean basin, using a panel of four microsatellite markers. Recorded low FST values within the study area indicate little evidence of genetic differentiation among populations. Results suggest high gene flow which may imply near-panmixia between populations, indicating the possibility of a probable movement of adult migrants, or strong passive drift at sea in early life stages of the species. To this extent, bibliographically speaking, different species within the Sparidae family favor altered population dynamics patterns with respect to local populations and genetic divergence, in the context of the molecular marker used.
Athanasios Exadactylos; Dimitrios Vafidis; Costas S. Tsigenopoulos; Georgios A. Gkafas. High Connectivity of the White Seabream (Diplodus sargus, L. 1758) in the Aegean Sea, Eastern Mediterranean Basin. Animals 2019, 9, 979 .
AMA StyleAthanasios Exadactylos, Dimitrios Vafidis, Costas S. Tsigenopoulos, Georgios A. Gkafas. High Connectivity of the White Seabream (Diplodus sargus, L. 1758) in the Aegean Sea, Eastern Mediterranean Basin. Animals. 2019; 9 (11):979.
Chicago/Turabian StyleAthanasios Exadactylos; Dimitrios Vafidis; Costas S. Tsigenopoulos; Georgios A. Gkafas. 2019. "High Connectivity of the White Seabream (Diplodus sargus, L. 1758) in the Aegean Sea, Eastern Mediterranean Basin." Animals 9, no. 11: 979.
Background Comprehensively detailed information on population dynamics for benthic species is crucial since potential admixture of individuals could shift the genetic subdivision and age structure during a full breeding period. The apparent genetic impact of the potential recruitment strategy of Norway lobsterNephrops norvegicusis still under research. For this reason the present study was focused on genetic variation of the species over a given continuous year period in a semi-enclosed gulf of the Aegean Sea. Results Analyses revealed that the relative smaller size class in females and the apparent faster growth of males may represent a key-role differential strategy for the two sexes, whereas females tend to mature slower. Heterozygosity fitness correlations (HFCs) showed substantially significant associations suggesting that inbreeding depression for females and outbreeding depression for males are the proximate fitness mechanisms, respectively. Conclusions Nephrops norvegicusuniformal genetic composition (background of high gene flow), could be attributed to potential population recolonization, due to a hypothesized passive larval movement from deeper waters, which may suggest that some offspring of local residents and potential male non-breeders from other regions admixture randomly.
Georgios A. Gkafas; Marianthi Hatziioannou; Emmanouil E. Malandrakis; Costas Tsigenopoulos; Ioannis T. Karapanagiotidis; Elena Mente; Dimitrios Vafidis; Athanasios Exadactylos. Heterozygosity fitness correlations and generation interval of the Norway lobster in the Aegean Sea, eastern Mediterranean. Journal of Biological Research-Thessaloniki 2019, 26, 1 -9.
AMA StyleGeorgios A. Gkafas, Marianthi Hatziioannou, Emmanouil E. Malandrakis, Costas Tsigenopoulos, Ioannis T. Karapanagiotidis, Elena Mente, Dimitrios Vafidis, Athanasios Exadactylos. Heterozygosity fitness correlations and generation interval of the Norway lobster in the Aegean Sea, eastern Mediterranean. Journal of Biological Research-Thessaloniki. 2019; 26 (1):1-9.
Chicago/Turabian StyleGeorgios A. Gkafas; Marianthi Hatziioannou; Emmanouil E. Malandrakis; Costas Tsigenopoulos; Ioannis T. Karapanagiotidis; Elena Mente; Dimitrios Vafidis; Athanasios Exadactylos. 2019. "Heterozygosity fitness correlations and generation interval of the Norway lobster in the Aegean Sea, eastern Mediterranean." Journal of Biological Research-Thessaloniki 26, no. 1: 1-9.