Climate change will decrease the range of a keystone fish species in La Plata River Basin, South America

Ruaro, Renata; Conceição, Eliezer O.; Silva, Jislaine C.; Cafofo, Emanuel G.; Angulo‐Valencia, Mirtha Amanda; Mantovano, Tatiane; Pineda, Alfonso; Paula, Aline Caroline Magro de; Zanco, Bárbara Furigo; Capparros, Eloiza Muniz; Moresco, Geovani Arnhold; Oliveira, Isadora Janolio de; Antiqueira, Janice L.; Ernandes-Silva, Jéssica; Silva, Jislaine Cristina da; Adelino, José Ricardo Pires; Santos, Joyce Andreia dos; Ganassin, Maria Julia Mileo; Iquematsu, Marcia Sayuri; Landgraf, Guilherme Okuda; Lemes, Priscila; Cassemiro, Fernanda A. S.; Batista-Silva, Valéria Flávia; Diniz‐Filho, José Alexandre Felizola; Rangel, Thiago F.; Agostinho, Ângelo Antônio; Bailly, Dayani

doi:10.1007/s10750-019-3904-0

Cited by 21 publications

(15 citation statements)

References 94 publications

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“…However, Wootton (1998) and Vazzoler (1996) affirm that the length at first maturity may vary for the same species as a function of time, population density and environmental characteristics. As such, for Salminus brasiliensis, a highly appreciated fish species in artisanal and sport fishing (Barzotto, Sanches, Bialetzki, Orvati, & Gomes, 2015) and considered a keystone species of high economic interest in the La Plata River Basin in South America (Ruaro et al, 2019), our estimated average value (29.6 cm) for the length at first maturity was lower than that recorded by Bozza and Hahn (2010) (37.8 cm) in the upper Paraná River floodplain. It is important to highlight that, while these values are within the confidence interval estimated in our study, they can help stakeholders in the decision-making of fishery management measures, as for example with the minimum capture size of "dorado" in the Verde River Basin.…”

Section: Discussioncontrasting

confidence: 65%

Reproduction of fishes of the Verde River, upper Paraná River Basin, Brazil

Neves

Gubiani

Silva

et al. 2020

RBT

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Abstract. Introduction: Understanding the various aspects of the reproductive biology of fish is a key step towards applying effective strategies for sustainable management of fishery resources. Objective: We aimed to evaluate the sex ratio, reproductive period and lengths at first maturity for 30 fish species caught in the Verde River, upper Paraná River Basin, Brazil. Methods: Fish were sampled monthly from November 2010 to March 2011 and from October 2011 to February 2012, and sampled quarterly from May to August in 2011 and 2012; totaling 14 samples. Fish were measured and weighed in the laboratory. In addition, gender and gonadal developmental stage were identified macroscopically. Subsequently, the sex ratio was determined and significant differences were tested using the chi-square (χ²) method. The reproductive period was determined with the use of gonadal developmental stages and the gonadosomatic index. Lastly, length at first maturity was estimated only for the species that presented individuals with sufficient immature and mature gonads to adjust the model. Results: Of the captured individuals, 51.5 % were male, and 48.5 % were female. Fifteen species showed significant differences in their sex ratios. The reproductive period for most species occurred from October to February, with reproductive peaks in November, December and January. The length at first maturity was estimated for only five species, including Salminus brasiliensis, a keystone species. Conclusions: The sex ratios revealed that for many species, there is a predominance of males over females, which was not expected for this parameter. The reproductive period follows the same pattern observed in Neotropical fish. However, it is noteworthy that some species are starting their reproduction in August.

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Section: Discussioncontrasting

confidence: 65%

Reproduction of fishes of the Verde River, upper Paraná River Basin, Brazil

Neves

Gubiani

Silva

et al. 2020

RBT

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“…Altitude is also an important factor structuring fish distribution in the neotropical region (Albert, Petry & Reis, 2011), as the average stream channel size declines with elevation (Lévêque, 1997; Reyjol et al, 2003) and flow variation increases (Poff & Ward, 1989; Oberdorff, Hugueny & Vigneron, 2001). In addition, the distance to the headwater source has been found to be an important predictor of fish distribution, with the number of species usually decreasing towards the river source (Bailly et al, 2016; Ruaro et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

The conservation of migratory fishes in the second largest river basin of South America depends on the creation of new protected areas

Bailly

Batista-Silva

Cassemiro

et al. 2021

Aquatic Conservation

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Freshwater ecosystems, providing valuable goods and services to humans, have been subjected to multiple human impacts, among which climate change plays a central role in threats to species. It is expected that protected areas, the cornerstone of biodiversity conservation efforts, will assume a decisive role in protecting freshwater species from the impacts of climate change. This study assessed the effects of climate change on migratory fish of the second largest neotropical river basin, evaluating the effectiveness of protected areas in safeguarding fish species, and hence the ecological functions that they perform and the ecosystem resources that they provide. The present range of 23 migratory fish of economic interest in the Paraná–Paraguay basin was estimated and the responses to future climatic shifts projected to the middle and end of the 21st century were examined, quantifying predictive uncertainties. Changes and losses of climatically suitable areas will trigger severe contractions in range, with the greatest impact on the most valuable species in commercial fishing, where range losses are likely to surpass 65% in the future. The main channel of the Upper Paraná River and tributaries of its left margin are projected to serve as climatic refuges for many species, and such regions are not affected by high predictive uncertainty. The results revealed that protected areas do not sufficiently protect migratory fish at present, and that they will continue to offer negligible protection in the face of climate change. This study alerts decision makers to the potential damage to inland fishery resources from climate change and provides useful information to guide conservation strategies spatially. We advocate that the creation of new protected areas and the redesign of the existing network to encompass regions that maximize current and future occupancy of migratory fish are crucial to conserve the valuable ecological, societal, and economic benefits that they provide.

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“…Since fish distribution is highly dependent on oceanographic conditions, any permanent change could have implications on their distribution and, therefore, in their management and conservation. The warming of the climate system is unequivocal and temperature of water bodies is increasing across the globe (Bahri, Barange, & Moustahfid, 2018;Ruaro et al, 2019). The Southwestern Atlantic is not an exception.…”

Section: Conservation Issuesmentioning

confidence: 99%

The Magellanic Province and its fish fauna (South America): Several provinces or one?

Cousseau

Pequeño

Mabragaña

et al. 2019

Journal of Biogeography

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Aim We assessed the validity of the division of the Magellanic Province into the four provinces as proposed by Briggs & Bowen (J Biogeogr 39 12–30, 2012): Southern Chile, Tierra del Fuego, Southern Argentina and Falkland (Malvinas) Islands. We aimed to (a) present an updated list of the fishes from the region known as ‘Magellanic Province’, (b) analyse the specific richness of fishes in the Atlantic and Pacific sectors and their degree of endemism and (c) evaluate statistically the validity of the three Provinces proposed for the Atlantic sector. Location Southern tip of the American continent at latitudes higher than 40° S in the Atlantic as well as in the Pacific Oceans. Taxon 348 South American marine fish species. Methods The list of fishes was prepared by consulting more than 140 sources, many related to observations resulting from research cruises, although two ichthyological collections and two ichthyological websites were also used. The South American species with distributions extending outside of the area corresponding to the Magellanic Province, and all cosmopolitan species, were excluded of endemism analyses. For analysing fish distributions in the Atlantic sector, the data employed are from eight research cruises carried out from 1978 to 2006 from 37° to 55° south. A total of 523 fishing trawls have been analysed, grouped into cell of 1° × 1° cells. The species composition of each cell was evaluated by multivariate analysis (non‐metric multidimensional scaling, cluster and similarity analyses). Results The percentage of endemism in each sector (Atlantic 2.87% and Pacific 2.87%) is smaller than the endemism common to both sectors (9.2%). The total of endemic species in the Province is 14.94%, which is bigger than the 10% indicated as the lower limit for defining a biogeographic province suggested by Briggs (Marine Zoogeography, 1974). In addition, multivariate analyses do not show differences in the species composition, neither between Falkland (Malvinas) Islands and ‘Southern Argentina’ nor between the latter and Tierra del Fuego. Main conclusions The ichthyological data indicate only one biogeographic province in the region not four as previously posited.

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Climate change will decrease the range of a keystone fish species in La Plata River Basin, South America

Cited by 21 publications

References 94 publications

Reproduction of fishes of the Verde River, upper Paraná River Basin, Brazil

Reproduction of fishes of the Verde River, upper Paraná River Basin, Brazil

The conservation of migratory fishes in the second largest river basin of South America depends on the creation of new protected areas

The Magellanic Province and its fish fauna (South America): Several provinces or one?

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