Indices of CPUE are presented for skipjack tuna (Katsuwonus pelamis) for the Indian Ocean over th... more Indices of CPUE are presented for skipjack tuna (Katsuwonus pelamis) for the Indian Ocean over the period 1980-2013. The analysis was initiated under the framework of the E.U. research project CECOFAD, whose objectives are to enhance our understanding of fishing effort units and improve the accuracy of purse-seine CPUE estimates. Skipjack stock assessments mainly depend on abundance indices derived from purse-seine fleets, thus standardisation of purse seiner CPUEs for this species is a priority. We follow a CPUE definition framework where three different types of CPUE are calculated to describe trends in number of schools, school detectability and catchability and school size. CPUE standardization is typically achieved with the development of GLM models; these estimates are often biased because the range of the fishing area changes from one year to the next. We compare CPUE trends derived from conventional GLMs with trends based on GLMMs, where the spatial explanatory variables are...
Pita, C., Katara, I. (2015). Conflicts in Marine Protected Areas: The case of leatherback turtles... more Pita, C., Katara, I. (2015). Conflicts in Marine Protected Areas: The case of leatherback turtles. In: Redpath, S. et al. (Eds). Conservation Conflicts: Navegating towards solutions. Cambridge University Press Ecological Reviews. ISBN:9781107017696
1 School of Biological Sciences (Zoology),University of Aberdeen, Tillydrone Avenue, Aberdeen AB2... more 1 School of Biological Sciences (Zoology),University of Aberdeen, Tillydrone Avenue, Aberdeen AB242TZ, UK, Phone 44 (0)1224 273255 (fax 272396) - nhy437@abdn.ac.uk 2 Marine Geographic Information Systems, Hellenic Center for Marine Research, PO BOX 2214, 71003 Iraklion ...
Recent research suggests the coupling of climatic fluctuations and changes in biological indices ... more Recent research suggests the coupling of climatic fluctuations and changes in biological indices that describe species richness, abundance and spatiotemporal distribution. In this study, large-scale modes of atmospheric variability over the northern hemisphere are associated with chlorophyll-a concentration in the Mediterranean. Sea level atmospheric pressure, air temperature, wind speed and precipitation are used to account for climatic and local weather
A time series of satellite imagery of AVHRR sea surface temperature (SST) and SeaWiFS chlorophyll... more A time series of satellite imagery of AVHRR sea surface temperature (SST) and SeaWiFS chlorophyll concentration (CHL) for Hellenic waters are analyzed for the mapping of anomaly distribution in these environmental parameters. The spatial distributions of these anomalies are ...
FISHERIES 251 Acknowledgments: We gratefully acknowledge travel support from UNEP&amp... more FISHERIES 251 Acknowledgments: We gratefully acknowledge travel support from UNEP's RAC/SPA (Regional Activity Centre for Specially Protected Areas), the Bern Convention and other donors through the Symposium Travel Committee. Order: 306 Abstract ID: 1647 ...
Indices of CPUE are presented for skipjack tuna (Katsuwonus pelamis) for the Indian Ocean over th... more Indices of CPUE are presented for skipjack tuna (Katsuwonus pelamis) for the Indian Ocean over the period 1980-2013. The analysis was initiated under the framework of the E.U. research project CECOFAD, whose objectives are to enhance our understanding of fishing effort units and improve the accuracy of purse-seine CPUE estimates. Skipjack stock assessments mainly depend on abundance indices derived from purse-seine fleets, thus standardisation of purse seiner CPUEs for this species is a priority. We follow a CPUE definition framework where three different types of CPUE are calculated to describe trends in number of schools, school detectability and catchability and school size. CPUE standardization is typically achieved with the development of GLM models; these estimates are often biased because the range of the fishing area changes from one year to the next. We compare CPUE trends derived from conventional GLMs with trends based on GLMMs, where the spatial explanatory variables are...
Pita, C., Katara, I. (2015). Conflicts in Marine Protected Areas: The case of leatherback turtles... more Pita, C., Katara, I. (2015). Conflicts in Marine Protected Areas: The case of leatherback turtles. In: Redpath, S. et al. (Eds). Conservation Conflicts: Navegating towards solutions. Cambridge University Press Ecological Reviews. ISBN:9781107017696
1 School of Biological Sciences (Zoology),University of Aberdeen, Tillydrone Avenue, Aberdeen AB2... more 1 School of Biological Sciences (Zoology),University of Aberdeen, Tillydrone Avenue, Aberdeen AB242TZ, UK, Phone 44 (0)1224 273255 (fax 272396) - nhy437@abdn.ac.uk 2 Marine Geographic Information Systems, Hellenic Center for Marine Research, PO BOX 2214, 71003 Iraklion ...
Recent research suggests the coupling of climatic fluctuations and changes in biological indices ... more Recent research suggests the coupling of climatic fluctuations and changes in biological indices that describe species richness, abundance and spatiotemporal distribution. In this study, large-scale modes of atmospheric variability over the northern hemisphere are associated with chlorophyll-a concentration in the Mediterranean. Sea level atmospheric pressure, air temperature, wind speed and precipitation are used to account for climatic and local weather
A time series of satellite imagery of AVHRR sea surface temperature (SST) and SeaWiFS chlorophyll... more A time series of satellite imagery of AVHRR sea surface temperature (SST) and SeaWiFS chlorophyll concentration (CHL) for Hellenic waters are analyzed for the mapping of anomaly distribution in these environmental parameters. The spatial distributions of these anomalies are ...
FISHERIES 251 Acknowledgments: We gratefully acknowledge travel support from UNEP&amp... more FISHERIES 251 Acknowledgments: We gratefully acknowledge travel support from UNEP's RAC/SPA (Regional Activity Centre for Specially Protected Areas), the Bern Convention and other donors through the Symposium Travel Committee. Order: 306 Abstract ID: 1647 ...
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