Impact of climatic fluctuations on commercial fisheries in the Paraná River along the last century

We analysed the effects of decadal and annual hydrologic fluctuations on freshwater fisheries catches in the Middle Paraná River for a period of six decades from the 1930s to the 1980s. We first analysed changes in the flow regime of the Paraná River for the period between 1930s and 1980s, with focu...

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Detalles Bibliográficos
Autores principales:	Rabuffetti, Ana Pía, Górski, Konrad, Espínola, Luis Alberto, Abrial, Elie, Amsler, Mario Luis, Paira, Aldo Raul
Formato:	Objeto de conferencia
Lenguaje:	Inglés
Publicado:	2016
Materias:	Ecología Cambio Climático Parana
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/123618
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-123618
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ecología Cambio Climático Parana
spellingShingle	Ecología Cambio Climático Parana Rabuffetti, Ana Pía Górski, Konrad Espínola, Luis Alberto Abrial, Elie Amsler, Mario Luis Paira, Aldo Raul Impact of climatic fluctuations on commercial fisheries in the Paraná River along the last century
topic_facet	Ecología Cambio Climático Parana
description	We analysed the effects of decadal and annual hydrologic fluctuations on freshwater fisheries catches in the Middle Paraná River for a period of six decades from the 1930s to the 1980s. We first analysed changes in the flow regime of the Paraná River for the period between 1930s and 1980s, with focus on the variations of the flood pulse. To build and compare flow typology among years, we used cluster analysis. Principal component analysis (PCA) was used to assess overall similarity of flows among years. The fisheries catch analysed (1935-1983) were obtained along this river corridor. The obtained data consisted of landing reports on monthly/annual catches (total and by species) in ports along the Paraná River. Differences in total catches among decades were tested using a one-way permutational analysis (PERMANOVA). The canonical analysis of the principal coordinates (CAP) was used to assess temporal patterns of similarity in fish catches per decades. To analysed the effects of flow regime variables on the variation of fish commercial catches we used distance-based redundancy analyses (dbRDAs). The climatic fluctuations in this period strongly affected the hydrology of the Middle Paraná River and the characteristics of its flow regime. The magnitude of floods as well as maximum, minimum and mean water levels increased progressively from 1930s until the 1980s concomitantly with increasing frequency and intensity of ENSO events that resulted in differentiation of distinct hydrological periods. The flood pulses were significantly more frequent and of greater magnitudes during the 1970s and 1980s. These large floods resulted in increased commercial fish catches in the 1980s, possibly due to enhanced recruitment. Specifically, large floods increased the commercial fish catches two years later. This effect was stronger for species that use floodplain habitats as areas of reproduction and larval nurseries, such as Prochilodus lineatus. We conclude that the natural flow regime of the Paraná River and perhaps other large subtropical rivers must be preserved in order to sustain their productive fisheries.
format	Objeto de conferencia Objeto de conferencia
author	Rabuffetti, Ana Pía Górski, Konrad Espínola, Luis Alberto Abrial, Elie Amsler, Mario Luis Paira, Aldo Raul
author_facet	Rabuffetti, Ana Pía Górski, Konrad Espínola, Luis Alberto Abrial, Elie Amsler, Mario Luis Paira, Aldo Raul
author_sort	Rabuffetti, Ana Pía
title	Impact of climatic fluctuations on commercial fisheries in the Paraná River along the last century
title_short	Impact of climatic fluctuations on commercial fisheries in the Paraná River along the last century
title_full	Impact of climatic fluctuations on commercial fisheries in the Paraná River along the last century
title_fullStr	Impact of climatic fluctuations on commercial fisheries in the Paraná River along the last century
title_full_unstemmed	Impact of climatic fluctuations on commercial fisheries in the Paraná River along the last century
title_sort	impact of climatic fluctuations on commercial fisheries in the paraná river along the last century
publishDate	2016
url	http://sedici.unlp.edu.ar/handle/10915/123618
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bdutipo_str	Repositorios
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Impact of climatic fluctuations on commercial fisheries in the Paraná River along the last century

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