Multi‐year comparisons of fish recruitment, growth and production in two drought‐affected Iberian estuaries
Marina Dolbeth A C , Filipe Martinho A , Vânia Freitas B , Sérgia Costa‐Dias B , Joana Campos B and Miguel Ângelo Pardal A
+ Author Affiliations
- Author Affiliations
A CEF – Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Apartado 3046, 3001‐401 Coimbra, Portugal.
B CIMAR/CIIMAR – Centro Interdisciplinar de Investigação Marinha e Ambiental – Universidade do Porto, Rua dos Bragas 289, 4050‐123 Porto, Portugal.
C Corresponding author. Email: mdolbeth@ci.uc.pt
Marine and Freshwater Research 61(12) 1399-1415 https://doi.org/10.1071/MF10002
Submitted: 4 January 2010 Accepted: 6 August 2010 Published: 13 December 2010
Abstract
Climate extremes, such as drought and floods, are increasing and should be considered in ecosystem management plans. The effects of an extreme drought were studied in two estuaries of the Iberian coast, Minho and Mondego, by exploring fish recruitment, growth and production over four years. The two estuaries are located within an area with transitional climate, and differ considerably in size, availability of freshwater wetlands and freshwater inflow. Fishes from the Minho estuary, at higher latitude, generally had lower growth rates and later timing of recruitment. During the drought, freshwater inflow was severely reduced in both estuaries. The overall fish assemblage production in the Minho estuary decreased considerably, whereas in the Mondego estuary it showed an increase. However, the drought effects seemed highly species‐specific and dependent on local geomorphology; the increase in the Mondego estuary was a result of an increase in a single species, whereas other species decreased or maintained similar production levels. Decreases in production in both estuaries were attributed to direct and indirect effects of changes in the freshwater inflow during the study period. This parameter should therefore be considered when undertaking management plans for transitional waters.
Additional keywords: climate, drought, estuarine fish, geomorphology, hydrology, Iberian Peninsula.
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