Interspecific variation in migratory fish recruitment in the Upper Paraná River: effects of the duration and timing of floods

Oliveira, Anielly Galego de; Suzuki, Harumi Irene; Gomes, Luiz Carlos; Agostinho, Ângelo Antônio

doi:10.1007/s10641-014-0361-5

Cited by 60 publications

(75 citation statements)

References 15 publications

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“…The apparent association between the captures of P. lineatus juveniles (age 0+) in El Espinillo Island Lake and the number of days with water levels over bankfull during October to March is in agreement with the general hypothesis that recruitment is environmentally driven and positively shaped during later stages of the larval and/or juvenile periods (Chambers & Trippel, ; Hjort, ; Houde, ; Leggett & Deblois, ). The present results are also consistent with those of Quirós and Cuch () for historical landings from the Lower Paraná, and for young recruits of the species from the Upper River Paraná (Agostinho, Gomes, Veríssimo & Okada, ; Gomes & Agostinho, ; Oliveira et al., ; Suzuki et al., ), where a positive correlation was observed for each variable under analysis with prolonged floodplain inundation during spring–summer. Indeed, almost 95% of P. lineatus juveniles captured in this study occurred in <25% of the total number of samples collected during the study, particularly those obtained in 2009–2010 and 2015–2016, when the maximum river discharges occurred.…”

Section: Discussionsupporting

confidence: 92%

Episodic recruitment of young Prochilodus lineatus (Valenciennes, 1836) (Characiformes: Prochilodontidae) during high discharge in a floodplain lake of the River Paraná, Argentina

Lozano¹,

Vegh

Gómez³

et al. 2019

Fisheries Management Eco

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Prochilodus lineatus (Val.) is one of the main target species of South American freshwater fisheries. The following null hypotheses regarding juvenile recruitment of P. lineatus were tested: (a) recruitment is not determined by variations in larval abundance and (b) recruitment is not determined by variations in discharge. For this purpose, variations in abundance of larvae in main channel drift and monthly captures of juveniles in a floodplain lake of the River Paraná were examined weekly between 2009 and 2016. Mean annual abundances of larval densities and CPUE of juveniles were correlated with a set of hydrometric variables. A positive correlation was found between the abundance of juveniles with high and persistent flood pulses. By contrast, larval abundance was not correlated with juvenile abundance. Pronounced contrast was found in the recruitment of P. lineatus between years of high and low discharge, which supports the hypothesis that floods are the main determining factor for recruitment of this species.

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Section: Discussionsupporting

confidence: 92%

Episodic recruitment of young Prochilodus lineatus (Valenciennes, 1836) (Characiformes: Prochilodontidae) during high discharge in a floodplain lake of the River Paraná, Argentina

Lozano¹,

Vegh

Gómez³

et al. 2019

Fisheries Management Eco

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“…The ideal timing of flood occurrence is in October and November, while the duration should be of at least 50 uninterrupted days (following Agostinho et al, 2004;Suzuki et al, 2009;Luz-Agostinho et al, 2009;Oliveira et al, 2015). Regarding conservation management strategies, in the best case, it is of utmost importance that flood events should not have intervals longer than 3 years.…”

Section: Discussionmentioning

confidence: 99%

“…Captured fish were anaesthetised with 5% benzocaine, sacrificed, identified to species, counted and measured the standard length. At this level, the average river discharge exceeds 12,300 m³/s and floods 29% of the 359 km² of the floodplain (Oliveira, Suzuki, Gomes, & Agostinho, 2015;Rocha, Santos, & Souza Filho, 2001). We performed this because the sampling sites are located less than 8 km apart, and they belong to the same waterscape during high water levels.…”

Section: Samplingmentioning

confidence: 99%

Fish functional diversity responses following flood pulses in the upper Paraná River floodplain

Baumgartner

Oliveira

Agostinho

et al. 2018

Ecology of Freshwater Fish

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Flood pulses are the main force driving the dynamics of aquatic communities in floodplains. The responses of communities to environmental changes following flood pulses usually demand a time lag to appear and reach the climax. We assembled a data set of 16 years of fish samplings to assess the relationship between water level and four functional diversity measures, in the upper Paraná River floodplain.Specifically, we approached four aspects of each relationship between water level and functional diversity: nature (positive or negative), sensitivity (response intensity), responsiveness (response delay) and extent (response duration). The nature of the relationship between water level and functional diversity was positive in all cases.Functional richness (FRic) responded right after flood pulses, although with shorter extent. Abundance-dependent functional measures (evenness-FEve; divergence-FDiv; and Rao's quadratic entropy-Rao's Q) presented delayed responses, reaching peaks more than 1.5 years after flood pulses. Significant effects of floods on fish functional diversity were observed for more than 3 years, although the highest functional diversity was observed with 1.8 years, on average. More importantly, flood pulses had no longer significant effects on functional diversity after 4 years.Regarding conservation strategies in regulated systems, flood events should occur every 2 or 3 years, with adequate timing (October-November), intensity (up to 450 cm) and duration (at least 50 uninterrupted days). Intervals longer than 3 years or inadequate timing, intensity and duration could dramatically decrease functional diversity and compromise ecosystem services.

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“…In addition, the rainy period, 2 e160135 [2] concentrated in the spring and summer, is seasonally marked in the drainage basins of the Paraná and Paraguay rivers, while rain peaks can occur at different seasons throughout the year in the Upper Uruguay River Basin (Zaniboni-Filho, Schulz, 2003). Migratory species exhibit a high degree of synchronization between the reproduction event and favorable environmental conditions (Winemiller, Jepsen, 1998), since flood is a key factor for the timing of reproduction even in the absence of a clear dry and rainy season (Agostinho et al, 2004;Oliveira et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Wide reproductive period of a long-distance migratory fish in a subtropical river, Brazil

et al. 2017

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Salminus brasiliensis is a potamodromous fish species that occurs in southern South American rivers. In spite of its ecological and economic relevance, information regarding the reproductive biology of S. brasiliensis is still scarce. This study used data from 18 years of continuous sampling in the Upper Uruguay River Basin, analyzing 718 adult fish (307 males, 243 females, 168 undefined) captured at different months of the year. The results showed that the reproductive timing for S. brasiliensis is wide in the Upper Uruguay River, with the occurrence of mature fish between the month of August and March and spawned individuals between July and May of the next year. These results were sustained by the increase of gonadal somatic relationship (GSR) from August. The reproductive timing of S. brasiliensis in the Upper Uruguay River may start between the middle winter and early spring (from late July to late September), and may extend until the late summer and middle fall (from the middle February to early May). These findings contribute to information on the general biology of S. brasiliensis and provide valuable knowledge to management programs and to conservation efforts of this fisheries resource.

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Interspecific variation in migratory fish recruitment in the Upper Paraná River: effects of the duration and timing of floods

Cited by 60 publications

References 15 publications

Episodic recruitment of young Prochilodus lineatus (Valenciennes, 1836) (Characiformes: Prochilodontidae) during high discharge in a floodplain lake of the River Paraná, Argentina

Episodic recruitment of young Prochilodus lineatus (Valenciennes, 1836) (Characiformes: Prochilodontidae) during high discharge in a floodplain lake of the River Paraná, Argentina

Fish functional diversity responses following flood pulses in the upper Paraná River floodplain

Wide reproductive period of a long-distance migratory fish in a subtropical river, Brazil

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