The National Marine Park of Zakynthos (NMPZ) outlines its contribution to the conservation of the... more The National Marine Park of Zakynthos (NMPZ) outlines its contribution to the conservation of the nesting activity of the loggerhead Sea turtles (Caretta caretta) in the Mediterranean. These species lay their eggs on the six beaches of Laganas Bay in a proportion that reaches the 26% of the total documented effort in Mediterranean. At the same time, the development of tourism industry in Laganas Bay may undermine the preservation of the natural environment, resulting to the emergence of many conflicts that are of particular importance. This paper used the Categorical Principal Component Analysis (CATPCA) to investigate the statistical relationships between the spatial and anthropogenic descriptors of the area. The main outcomes of the study indicate that there is a great variance between area’s descriptors separating spatial from anthropogenic, and also the grouping of the nine selected areas of the study confirm the zoning system as it is presented in the management plan of the Par...
An operational population model for hake developed in FLR framework of the R language under the E... more An operational population model for hake developed in FLR framework of the R language under the EFIMAS project is presented. Two effort restriction scenarios were tested (10% and 20% reduction of fishing mortality F). The response of the hake fishery in these two management measures was evaluated for a 10-year projection period. Hake is one of the main target species of several multi-species Mediter-ranean fisheries and especially of the bottom trawlers exploiting the conti-nental slope. On the basis of the available data most of the hake stocks in the Mediterranean are either fully exploited or overexploited. In most of the cases a decreasing trend in individual lengths of the hake caught and in the catches per unit of effort of the trawlers can be observed. Fisheries management in the Mediterranean is based mainly on technical measures and control effort regimes i.e. a minimum landing size of 20 cm, a prohi-bition of bottom trawling within three miles of the coast or in depths les...
ABSTRACT Deriving maps of phytoplankton taxa based on remote sensing data using bio-optical prope... more ABSTRACT Deriving maps of phytoplankton taxa based on remote sensing data using bio-optical properties of phytoplankton alone is challenging. A more holistic approach was developed using artificial neural networks, incorporating ecological and geographical knowledge together with ocean color, bio-optical characteristics, and remotely sensed physical parameters. Results show that the combined remote sensing approach could discriminate four major phytoplankton functional types (diatoms, dinoflagellates, coccolithophores, and silicoflagellates) with an accuracy of more than 70%. Models indicate that the most important information for phytoplankton functional type discrimination is spatio-temporal information and sea surface temperature. This approach can supply data for large-scale maps of predicted phytoplankton functional types, and an example is shown. As the foundation of the aquatic food chain, phytoplankton are an integral part of the ecosystem, affecting trophic dynamics, nutrient cycling, habitat condition, and fisheries resources (Irigoien et al. 2002). Phytoplankton are
The National Marine Park of Zakynthos (NMPZ) outlines its contribution to the conservation of the... more The National Marine Park of Zakynthos (NMPZ) outlines its contribution to the conservation of the nesting activity of the loggerhead Sea turtles (Caretta caretta) in the Mediterranean. These species lay their eggs on the six beaches of Laganas Bay in a proportion that reaches the 26% of the total documented effort in Mediterranean. At the same time, the development of tourism industry in Laganas Bay may undermine the preservation of the natural environment, resulting to the emergence of many conflicts that are of particular importance. This paper used the Categorical Principal Component Analysis (CATPCA) to investigate the statistical relationships between the spatial and anthropogenic descriptors of the area. The main outcomes of the study indicate that there is a great variance between area’s descriptors separating spatial from anthropogenic, and also the grouping of the nine selected areas of the study confirm the zoning system as it is presented in the management plan of the Par...
An operational population model for hake developed in FLR framework of the R language under the E... more An operational population model for hake developed in FLR framework of the R language under the EFIMAS project is presented. Two effort restriction scenarios were tested (10% and 20% reduction of fishing mortality F). The response of the hake fishery in these two management measures was evaluated for a 10-year projection period. Hake is one of the main target species of several multi-species Mediter-ranean fisheries and especially of the bottom trawlers exploiting the conti-nental slope. On the basis of the available data most of the hake stocks in the Mediterranean are either fully exploited or overexploited. In most of the cases a decreasing trend in individual lengths of the hake caught and in the catches per unit of effort of the trawlers can be observed. Fisheries management in the Mediterranean is based mainly on technical measures and control effort regimes i.e. a minimum landing size of 20 cm, a prohi-bition of bottom trawling within three miles of the coast or in depths les...
ABSTRACT Deriving maps of phytoplankton taxa based on remote sensing data using bio-optical prope... more ABSTRACT Deriving maps of phytoplankton taxa based on remote sensing data using bio-optical properties of phytoplankton alone is challenging. A more holistic approach was developed using artificial neural networks, incorporating ecological and geographical knowledge together with ocean color, bio-optical characteristics, and remotely sensed physical parameters. Results show that the combined remote sensing approach could discriminate four major phytoplankton functional types (diatoms, dinoflagellates, coccolithophores, and silicoflagellates) with an accuracy of more than 70%. Models indicate that the most important information for phytoplankton functional type discrimination is spatio-temporal information and sea surface temperature. This approach can supply data for large-scale maps of predicted phytoplankton functional types, and an example is shown. As the foundation of the aquatic food chain, phytoplankton are an integral part of the ecosystem, affecting trophic dynamics, nutrient cycling, habitat condition, and fisheries resources (Irigoien et al. 2002). Phytoplankton are
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