Impact of global warming on European tidal estuaries: some evidence of northward migration of estuarine fish species |
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Authors: | Delphine Nicolas Aurélie Chaalali Hilaire Drouineau Jérémy Lobry Ainhize Uriarte Angel Borja Philippe Boët |
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Institution: | (1) Cemagref, UR EPBX, 50 av. de Verdun, 33612 Cestas, France;(2) Marine Research Division, AZTI—Tecnalia, Pasaia, Spain |
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Abstract: | The aim of this study was to determine whether the latitudinal distribution of fish species that use estuaries to complete
their entire life cycle has shifted northward as an expected consequence of global warming. The mean latitude of past fish
species distributions found in 1970s’ literature was compared with the mean latitude of distributions today based on fish
density indices collected in 55 tidal estuaries along the Atlantic European seaboard, from Portugal to Scotland. Among the
15 most common species, 11 displayed a positive difference between current and past mean latitudes suggesting a northward
shift of the populations. Using the occurrence of subtropical species in temperate areas as an indicator of water warming,
the northernmost range limit of 10 subtropical species was subsequently focused on. Six of them were recorded up to their
past northern latitudinal limit. These results reinforced the idea that a number of fish species associated to estuaries have
migrated northwards over the last 30 years, possibly due to water warming. These ecological changes can get important managerial
implications, i.e. in the assessment of the ecological status in European directives. |
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