Flood pulse are the main determinant of feeding dynamics and composition of Odontostilbe pequira (Characiformes: Characidae) in southern Pantanal, Brazil

Scanferla, Andréa Fernanda Lourenço da Silva; Súarez, Yzél Rondon

doi:10.1590/s2179-975x3316

Cited by 5 publications

(4 citation statements)

References 30 publications

(35 reference statements)

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“…Moreover, as each prey species responds differently to seasonal variation, the predator depends on the plasticity of food resources for survival. This variation in dietary composition has already been reported in other fish species in floodplains (e.g., Ximenes et al, 2011;Quirino et al, 2015;Scanferla & Súarez, 2016;Costa-Pereira et al, 2017).…”

Section: Discussionsupporting

confidence: 79%

“…In dynamic and productive environments, such as the Pantanal, the flood pulse is the main determinant of the structure and function of aquatic communities (Junk et al, 1989). Particularly in this system, hydrological variation throughout the year directly interferes with the availability and variety of food items, which consequently leads to changes in the fish diet (Ferreira et al, 2014;Scanferla & Súarez, 2016). The aquatic macrophytes that colonize this floodplain also play an important role in the complexity and heterogeneity of environments (Thomaz & Cunha, 2010;Dias et al, 2017b), providing shelter for insects, mollusks, periphyton, and fish (Silva et al, 2009;Saulino & Trivinho-Strixino, 2014), influencing the food chain (Grzybkowska et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

Gouveia¹,

Rondon

Súarez

2022

Acta Limnol. Bras.

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Aim This study investigated changes in the dietary composition and trophic niche breadth of Eigenmannia desantanai in the context of hydrological periods, rivers, and ontogeny. Methods Collections were performed monthly on the Paraguay and Amonguijá Rivers between February 2009 and January 2011. Results A total of 338 specimens of E. desantanai were collected, 224 of which came from the Amonguijá River and 114 from the Paraguay River. In all, 21 food items were identified. Fully remains of digested animals (RDA), Chironomidae, Cladocera, and Ostracoda showed greater importance in the diet of E. desantanai. Dietary composition was influenced by hydrological periods, followed by differences between sampled rivers, and ontogeny. In contrast, only hydrological periods explained variation in the E. desantanai trophic niche breadth. Conclusions The diet of E. desantanai is mainly composed of Chironomidae, Cladocera, and Ostracoda; however, individuals consumed other food items owing to changes in hydrological periods, followed by characteristics of the Amonguijá and Paraguay Rivers and ontogenetic variation. In this respect, the results of this study are germane to the food ecology of E. desantanai, providing guidelines for the management and conservation of the species.

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Section: Discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

Gouveia¹,

Rondon

Súarez

2022

Acta Limnol. Bras.

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“…Many studies relating the floodplain ecosystem functions to the hydrological regime link flood pulse and aquatic organisms (Petrere et al, 2002;Bailly et al, 2008;Costa and Mateus, 2009;Lourenço et al, 2012;Pinho and Marini, 2012;Ziober et al, 2012;Scanferla and Súarez, 2016;Barzotto and Mateus, 2017;Penha et al, 2017;Tondato et al, 2018;Pereira and Súarez, 2019;Santana et al, 2019). However, in most of these studies, the hydrological conditions were not sufficiently detailed to make direct correspondence with the observed HA in the upper plateau rivers feeding the Pantanal.…”

Section: Impacts Of Hydrological Alterations In the Pantanal Ecosystementioning

confidence: 99%

Dam-Induced Hydrologic Alterations in the Rivers Feeding the Pantanal

Ely

Fantin-Cruz

Tritico

et al. 2020

Front. Environ. Sci.

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Tropical river basins have experienced dramatically increased hydropower development over the last 20 years. These alterations have the potential to cause changes in hydrologic and ecologic systems. One heavily impacted system is the Upper Paraguay River Basin, which feeds the Pantanal wetland. The Pantanal is a Ramsar Heritage site and is one of the world's largest freshwater wetlands. Over the past 20 years, the number of hydropower facilities in the Upper Paraguay River Basin has more than doubled. This paper uses the Indicators of Hydrologic Alteration (IHA) method to assess the impact of 24 of these dams on the hydrologic regime over 20 years (10 years before and 10 years after dam installation) and proposes a method to disentangle the effects of dams from other drivers of hydrologic change using undammed “control” rivers. While most of these dams are small, run-of-the-river systems, each dam significantly altered at least one of the 33 hydrologic indicators assessed. Across all studied dams, 88 of the 256 calculated indicators changed significantly, causing changes of 5–40%, compared to undammed reaches. These changes were most common in indicators that quantify the frequency and duration of high and low pulses, along with those for the rate and frequency of hydrologic changes. Importantly, the flow regime in several undammed reaches also showed significant alterations, likely due to climate and land-use changes, supporting the need for measurements in representative control systems when attributing causes to observed change. Basin-wide hydrologic changes (in both dammed and undammed rivers) have the potential to fundamentally alter the hydrology, sediment patterns, and ecosystem of the Pantanal wetland. The proposed refinement of the IHA methods reveals crucial differences between dam-induced alteration and those assigned to other drivers of change; these need to be better understood for more efficient management of current hydropower plants or the implementation of future dams.

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“…However, with the decrease in the size of fish and fish stocks of commercial interest (Viana, 2013;Barthem et al, 2019), fishing becomes an unstable activity and causes insecurity regarding the use of this resource in cultural and economic terms (Santos and Santos, 2005). In addition, hydroelectric projects also negatively impact fisheries, since they affect the characteristic flood pulse of rivers (Junk and Mello, 1990;Almeida et al, 2020), and modify the behavior of the fish species that colonize or leave these environments during their migration processes for reproduction or feeding (Lewinsohn and Prado, 2002;Cintra et al, 2013;Scanferla and Suaréz, 2016).…”

Section: /14mentioning

confidence: 99%

The flood pulse regulates the longitudinal distribution of fish assemblages in the amazonian floodplain lakes

Sousa

Oliveira

Rosa³

2022

Bol. Inst. Pesca

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The present study evaluated the incidence of fish species in Cujubim Lake in Porto Velho (Rondônia, Brazil) concerning periods of flood and low water. For this, we used experimental fisheries, with ichthyofauna samplings carried out in the years 2019 and 2020, which resulted in 2,508 specimens. For quantifying the ecological data, we analyzed Shannon-Weaver diversity, species richness, Simpson dominance and Pielou evenness. The predominant fish orders were Characiformes and Siluriformes, and the species Anchovia aff. surinamensis was the most abundant (N=809/35.49%). Diversity indicators were similar across all sectors (S1=the lower margin - end, S2=center and S3=mouth of the lake). Only the levels of richness and abundance were lower in the S3 sector, despite the importance of this habitat as a link to the Madeira River, which indicates transient diversity, followed by active selection of the S1 and S2 sectors in the lake by most fish. Limnological data, such as those of temperature (30.30±1.20°C), conductivity (35.82±5.98 µS cm-1), dissolved oxygen (7.38±3.56 mg L-1) and pH (6.70±0.54), were within the acceptable levels for tropical fish. The non-metric multidimensional scaling (NMDS) analysis showed the ordering of parameters by sector and species with greater affinity for each environmental attribute, in which dissolved oxygen (NMDS1=-0.720; r2=0.862 and p=0.043) and electrical conductivity stood out. Thus, it can be concluded that the behavior of the fish diversity of Cujubim Lake is affected both seasonally and longitudinally.

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Flood pulse are the main determinant of feeding dynamics and composition of Odontostilbe pequira (Characiformes: Characidae) in southern Pantanal, Brazil

Cited by 5 publications

References 30 publications

Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

Dam-Induced Hydrologic Alterations in the Rivers Feeding the Pantanal

The flood pulse regulates the longitudinal distribution of fish assemblages in the amazonian floodplain lakes

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