caa a22 4500 44589301X CHVBK 20180317145622.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10750-011-0693-5 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0693-5 Environmental drivers of the anchovy/sardine complex in the Eastern Mediterranean [Elektronische Daten] [Isidora Katara, Graham Pierce, Janine Illian, Beth Scott] The anchovy/sardine complex is an important fishery resource in some of the largest upwelling systems in the world. Synchronous, but out of phase, fluctuations of the two species in distant parts of the oceans have prompted a number of studies dedicated to determining the phenomena, atmospheric and oceanic, responsible for the observed synchronicity and the biological mechanisms behind the population changes of the two species. Anchovy and sardine are of high commercial value for the fishing sector in Greece; this study investigates the impact of large-scale climatic indices on the anchovy/sardine complex in the Greek seas using fishery catches as a proxy for fish productivity. Time series of catches for both species were analysed for relationships with teleconnection indices and local environmental variability. The connection between the teleconnection indices and local weather/oceanic variation was also examined in an effort to describe physical mechanisms that link large-scale atmospheric patterns with anchovy and sardine. The West African Summer Monsoon, East Atlantic Jet and Pacific-North American (PNA) pattern exhibit coherent relationships with the catches of the two species. The first two aforementioned patterns are prominent atmospheric modes of variability during the summer months when sardine is spawning and anchovy juveniles are growing. PNA is related with El Niño Southern Oscillation events. Sea Surface Temperature (SST) appears as a significant link between atmospheric and biological variability either because higher temperatures seem to be favouring sardine growth or because lower temperatures, characteristic of productivity-enhancing oceanic features, exert a positive influence on both species. However at a local scale, other parameters such as wind and mesoscale circulation describe air-sea variability affecting the anchovy/sardine complex. These relationships are non-linear and in agreement with results of previous studies stressing the importance of optimal environmental windows. The results also show differences in the response of the two species to environmental forcing and possible interactions between the two species. The nature of these phenomena, e.g., if the species interactions are direct through competition or indirect through the food web, remains to be examined. Springer Science+Business Media B.V., 2011 Anchovy/sardine complex nationallicence Environmental effects nationallicence Teleconnections nationallicence Katara Isidora School of Biological Sciences (Zoology), University of Aberdeen, Tillydrone Avenue, AB24 2TZ, Aberdeen, UK aut Pierce Graham School of Biological Sciences (Zoology), University of Aberdeen, Tillydrone Avenue, AB24 2TZ, Aberdeen, UK aut Illian Janine School of Mathematics and Statistics, The Observatory, University of St. Andrews, Buchanan Gardens, KY16 9LZ, St. Andrews, UK aut Scott Beth School of Biological Sciences (Zoology), University of Aberdeen, Tillydrone Avenue, AB24 2TZ, Aberdeen, UK aut Hydrobiologia Springer Netherlands 670/1(2011-07-01), 49-65 0018-8158 670:1<49 2011 670 10750 https://doi.org/10.1007/s10750-011-0693-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0693-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Katara Isidora School of Biological Sciences (Zoology), University of Aberdeen, Tillydrone Avenue, AB24 2TZ, Aberdeen, UK aut NATIONALLICENCE 700 1- Pierce Graham School of Biological Sciences (Zoology), University of Aberdeen, Tillydrone Avenue, AB24 2TZ, Aberdeen, UK aut NATIONALLICENCE 700 1- Illian Janine School of Mathematics and Statistics, The Observatory, University of St. Andrews, Buchanan Gardens, KY16 9LZ, St. Andrews, UK aut NATIONALLICENCE 700 1- Scott Beth School of Biological Sciences (Zoology), University of Aberdeen, Tillydrone Avenue, AB24 2TZ, Aberdeen, UK aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 670/1(2011-07-01), 49-65 0018-8158 670:1<49 2011 670 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer