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Abstract

Modeling Long-Term Changes in Atlantic Salmon Abundance in the Ulla River (Galicia—Spain) through Multivariate Time-Series Analysis †

by
Esteban L. Alvarez-Romero
1,*,‡,
Marcos Barrio-Anta
2,
Carlos Garcia de Leaniz
3,
Pablo Caballero
4 and
Paloma Moran
5
1
DIRENA, Indurot-Institute of Natural Resources and Territorial Planning, Universidad de Oviedo, Escuela Politécnica de Mieres, 33600 Mieres, Spain
2
Departamento de Biología de Organismos y Sistemas, Area de Ingeniería Agroforestal, Universidad de Oviedo, Escuela Politécnica de Mieres, 33600 Mieres, Spain
3
BioSciences, CSAR-Centre for Sustainable Aquatic Research, Swansea University, Swansea SA2 8PP, UK
4
Dirección Xeral de Patrimonio Natural, Consellería de Medio Ambiente, Xunta de Galicia, 36002 Santiago de Compostela, Spain
5
Departamento de Bioquímica, Genética e Inmunología, Facultad de Biología, Universidad de Vigo, 33610 Vigo, Spain
*
Author to whom correspondence should be addressed.
Presented at the IX Iberian Congress of Ichthyology, Porto, Portugal, 20–23 June 2022.
Presenting author (Oral communication).
Biol. Life Sci. Forum 2022, 13(1), 111; https://doi.org/10.3390/blsf2022013111
Published: 17 June 2022
(This article belongs to the Proceedings of The IX Iberian Congress of Ichthyology)

Abstract

:
Due to the decline in catches of Atlantic salmon at the end of the 1980s, the Natural Heritage Service of the Xunta de Galicia has been obtaining data on the returning adults and the downstream migration of juvenile at the Ximonde fish-trap station since the year 1992 to 2021, as well as on the recapture of marked specimens from artificial restocking. At the same time, and during the same period, catches made by the fishing industry and the recruitment obtained through population censuses of different areas of the basin have been analyzed. A first exploratory analysis of the data indicates that the distribution area and flow regimes did not vary significantly during the study period. Throughout the time series, the number of juveniles stocked in the river changed, and even in some years none were stocked. The multivariate analysis of the time series indicates that the observed variations in the abundance of the population can be predicted based on the type of management carried out during the period studied, and that the methodology used in the Ulla river can potentially be used in other rivers with similar characteristics, especially those located in the southern areas of its natural distribution, affected by dams and with a reduced spawning habitat.

Author Contributions

Conceptualization, methodology, formal analysis, investigation and writing—original draft preparation, E.L.A.-R.; validation and project administration, M.B.-A.; resources and visualization, P.C.; data curation, P.M.; supervision and writing—review and editing, C.G.d.L. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

Samples come from salmon caught in recreational fishing, which is regulated by Spanish laws and regulations, we do not slaughter any animals. We use samples from salmon that are already legally dead.

Informed Consent Statement

Not applicable.

Data Availability Statement

This data can be found at https://cmatv.xunta.gal (accessed on 31 March 2022).

Conflicts of Interest

The authors declare no conflict of interest.
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Share and Cite

MDPI and ACS Style

Alvarez-Romero, E.L.; Barrio-Anta, M.; Garcia de Leaniz, C.; Caballero, P.; Moran, P. Modeling Long-Term Changes in Atlantic Salmon Abundance in the Ulla River (Galicia—Spain) through Multivariate Time-Series Analysis. Biol. Life Sci. Forum 2022, 13, 111. https://doi.org/10.3390/blsf2022013111

AMA Style

Alvarez-Romero EL, Barrio-Anta M, Garcia de Leaniz C, Caballero P, Moran P. Modeling Long-Term Changes in Atlantic Salmon Abundance in the Ulla River (Galicia—Spain) through Multivariate Time-Series Analysis. Biology and Life Sciences Forum. 2022; 13(1):111. https://doi.org/10.3390/blsf2022013111

Chicago/Turabian Style

Alvarez-Romero, Esteban L., Marcos Barrio-Anta, Carlos Garcia de Leaniz, Pablo Caballero, and Paloma Moran. 2022. "Modeling Long-Term Changes in Atlantic Salmon Abundance in the Ulla River (Galicia—Spain) through Multivariate Time-Series Analysis" Biology and Life Sciences Forum 13, no. 1: 111. https://doi.org/10.3390/blsf2022013111

APA Style

Alvarez-Romero, E. L., Barrio-Anta, M., Garcia de Leaniz, C., Caballero, P., & Moran, P. (2022). Modeling Long-Term Changes in Atlantic Salmon Abundance in the Ulla River (Galicia—Spain) through Multivariate Time-Series Analysis. Biology and Life Sciences Forum, 13(1), 111. https://doi.org/10.3390/blsf2022013111

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