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Article

Dynamics of Two Anadromous Species in a Dam Intersected River: Analysis of Two 100-Year Datasets

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CESAM—Centre for Environmental and Marine Studies & Department of Biology, University of Aveiro, 3810-193 Aveiro, Portugal
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Department of Physics & CESAM—Centre for Environmental and Marine Studies, University of Aveiro, 3810-193 Aveiro, Portugal
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Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros de Leixões, Av. General Norton de Matos s/n, 4450-208 Matosinhos, Portugal
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Aquamuseu do Rio Minho, Parque do Castelinho, 4920-290 Vila Nova de Cerveira, Portugal
*
Author to whom correspondence should be addressed.
Academic Editors: Maria Angeles Esteban and J. Todd Petty
Received: 21 April 2021 / Revised: 12 May 2021 / Accepted: 26 May 2021 / Published: 5 June 2021
Long-term time-series datasets are key for assessing the population dynamics of fish species with economic interest. This study examines two 100-year datasets for sea lamprey Petromyzon marinus and allis shad Alosa alosa from the Minho River. This basin on the Iberian Peninsula is home to one of the largest populations at the southern distribution limit of these critically endangered anadromous fish species. Besides assessing the importance of the environmental drivers of fish capture data (temperature, salinity, upwelling, precipitation, and climatic oscillation), this study also assesses how dam construction affected these populations using intervention analysis—A statistical tool to detect significant breakpoints in time series data. Results showed contrasting trends between sea lamprey and allis shad, with the number of captured fish from the first progressively improving from 1914 to 2017, and the latter recording a significant decline over time. Although no significant correlations were detected between fishing data and environmental variables, some of the identified breakpoints in the time series data matched the dates when the major dams in Minho River were built. Other historical activities associated with mining might explain the notable changes detected in the trends, while issues associated with illegal, unreported, and unregulated capture data are also discussed. View Full-Text
Keywords: Alosa alosa; Petromyzon marinus; dam construction; habitat fragmentation; Minho River Alosa alosa; Petromyzon marinus; dam construction; habitat fragmentation; Minho River
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MDPI and ACS Style

Azeiteiro, U.M.; Pereira, M.J.; Soares, A.M.V.M.; Braga, H.O.; Morgado, F.; Sousa, M.C.; Dias, J.M.; Antunes, C. Dynamics of Two Anadromous Species in a Dam Intersected River: Analysis of Two 100-Year Datasets. Fishes 2021, 6, 21. https://0-doi-org.brum.beds.ac.uk/10.3390/fishes6020021

AMA Style

Azeiteiro UM, Pereira MJ, Soares AMVM, Braga HO, Morgado F, Sousa MC, Dias JM, Antunes C. Dynamics of Two Anadromous Species in a Dam Intersected River: Analysis of Two 100-Year Datasets. Fishes. 2021; 6(2):21. https://0-doi-org.brum.beds.ac.uk/10.3390/fishes6020021

Chicago/Turabian Style

Azeiteiro, Ulisses M., Mário J. Pereira, Amadeu M.V.M. Soares, Heitor O. Braga, Fernando Morgado, Magda C. Sousa, João M. Dias, and Carlos Antunes. 2021. "Dynamics of Two Anadromous Species in a Dam Intersected River: Analysis of Two 100-Year Datasets" Fishes 6, no. 2: 21. https://0-doi-org.brum.beds.ac.uk/10.3390/fishes6020021

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