Artificial flow regime promotes abiotic and biotic gradients: Testing the concept of longitudinal zonation in an off-river reservoir

Guedes, Gustavo Henrique Soares; Mattos, Tailan Moretti; Camilo, Geysa da Silva; Uehara, Wagner; Ferreira, Débora Lisandra de Paiva; Araújo, Francisco Gerson

doi:10.1016/j.ecohyd.2020.02.002

Cited by 13 publications

(16 citation statements)

References 36 publications

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“…Both species analysed in this study are adapted to use environments with fluctuating and low oxygen concentration and are abundant in the Lajes Reservoir (Araújo & Santos, 2001; Duarte & Araújo, 2001; Guedes et al, 2020; Santos et al, 2004). According to Focesi Jr et al, (1979), air‐breathing fishes from the Loricariidae family have anatomical and physiological adaptations to allow them to endure a variety of oxygen conditions.…”

Section: Discussionmentioning

confidence: 99%

“…According to Focesi Jr et al, (1979), air‐breathing fishes from the Loricariidae family have anatomical and physiological adaptations to allow them to endure a variety of oxygen conditions. Loricariichthys castaneus is a bottom dwelling fish, occurring preferable in depths greater than 6 m, in low flow and predominantly muddy substrate (Costa et al, 2013; Guedes et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

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Assessment of changes in the ichthyofauna in a tropical reservoir in south‐eastern Brazil: Consequences of global warming?

Araújo

Azevedo

Guedes

et al. 2021

Ecology of Freshwater Fish

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Increases in temperatures over the last century, more intensively after the eighties, were recorded in several databases for the south‐eastern Brazil. These increases are likely to change fish communities in aquatic systems by decreasing abundances, biomass and sizes of some species more sensitive to climate change. Reservoirs may be particularly susceptible to the effects of climate change, as they isolate previously connected areas limiting fish dispersal and migration, as well as increasing water temperature and thermal stratification. We assessed temporal changes in the abundance and biomass of the ichthyofauna in an isolate reservoir (inflowing waters from small tributaries in a highland region) aiming to associate changes with climate effects over three decades (1990, 2000, 2010). Two abundant native species, a loricariid Loricariichthys castaneus (Castelnau, 1855) and a cichlid Geophagus brasiliensis (Quoy & Gaimard, 1824), were selected to assess eventual response to climate changes in their geographical distribution in the Southeast Atlantic Hydrographic Region, considering different carbon emission scenarios using ecological niche models. A decrease in the densities and biomass of the ichthyofauna and of the two selected species were observed in both summer and winter over the three decades, coinciding with increases in temperatures. These decreases were correlated with increases in positive anomalies of temperature, which may be an indicator of climatic changes, although with low explanation of the data variation. The mean size of L. castaneus decreased between the nineties and 2010, whereas no significant trend was found for the size of G. brasiliensis. Our predictions of new area for future adequacy indicated a loss in the distribution area for both species (mainly for G. brasiliensis), considering the most pessimistic scenario for 2050 and 2070, possibly due to climatic changes. Both hydroelectric dams and global warming pose threats to freshwater fish diversity, and both will interact. Changes observed in the fish assemblage over the last decades were essential for an assessment of the consequences of global warming in this type of reservoir combining larger scale studies with future projections.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Assessment of changes in the ichthyofauna in a tropical reservoir in south‐eastern Brazil: Consequences of global warming?

Araújo

Azevedo

Guedes

et al. 2021

Ecology of Freshwater Fish

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“…The water balance is mainly regulated by the transposition of water from an adjacent watershed and the contribution of small streams, by the seasonal rainfall with peaks in January-February (149.9 mm per month) and by the controlled discharges of the hydroelectric power plant. The mean inflow of water is 13.7 m 3 s −1 , of which most of the flow (8.3 m 3 s −1 ) is received by transposition from the interbasin diversion (Guedes et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The water retention time (≈300 days) and water transparency (euphotic zone = 9.2 m) are high, and oligo-mesotrophic conditions predominate (Guarino et al, 2005;Soares et al, 2008). Lentic conditions predominate in the longitudinal extent of the reservoir because of the low connectivity with tributaries and the dendritic reservoir morphology (Guedes et al, 2020). The climate is seasonal tropical with dry winters (Aw), according to the Köppen-Geiger classification.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium reproductive strategy of the peacock bass Cichla kelberi facilitates invasion into a Neotropical reservoir

Guedes

Gomes

Nascimento

et al. 2020

Journal of Fish Biology

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The reproductive strategy of the non-native predator cichlid Cichla kelberi was determined to explain its success after more than 60 years of being introduced into an isolated reservoir in southeastern Brazil. This was one of the first-known translocations of the genus Cichla out of its natural range. Macro-and microscopy characteristics of the gonadal development stages and the maturation phases, along with the reproductive features (size at first maturation size, gonado-somatic index and sex ratio), were described. It was hypothesized that the stable conditions of the reservoir, with low connectivity, weakly defined spatial gradient and slight seasonal changes in environmental variables, favour the equilibrium strategy that enables predators to have high offspring survivorship because of great parental investment in individual progeny. Sex ratio was well balanced, with males and females reaching first maturity between 30.0 and 28.6 cm total length (L T), respectively. The stages of oocyte (primary and secondary growth, vitellogenic and atresia) and spermatocyte (spermatogonia, spermatocytes, spermatids and spermatozoa) development were identified. Five phases of gonadal development (immature, developing, spawning capable, regressing and regenerating) were described for both sexes. A long reproductive season was found, with spawning peaks in August/September and, to a lesser extent, in April/May. Parental care and spawns in parcels (batch spawns) corroborated the raised equilibrium strategy that was effective in this isolated reservoir. This species developed reproductive mechanisms that fit to different environmental conditions, with multiple spawning being associated with lentic environments and asynchronous development of oocytes, which are released over long periods. The reproductive plasticity in reservoirs may be one of the main factors inherent to the successful of colonization and establishment of the peacock bass in the environments in which they were introduced.

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“…Mais recentemente, algumas pesquisas têm objetivado revisar os modelos clássicos de compartimentalização, buscar padrões mais específicos para ambientes tropicais e subtropicais e identificar elementos que causam desvios em relação às zonas espaciais tipicamente esperadas nos reservatórios (Carneiro;Bini, 2020;Guedes et al, 2020). Assim, tanto a compartimentalização vertical como a longitudinal são influenciadas por fatores ambientais (e.g.…”

Section: Reservatórios Artificiaisunclassified

Fixação de nitrogênio pelo fitoplâncton de água doce: experimentos >i<in situ>/i< e >i<in vitro>/i< para análise da influência de fatores ambientais

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Artificial flow regime promotes abiotic and biotic gradients: Testing the concept of longitudinal zonation in an off-river reservoir

Cited by 13 publications

References 36 publications

Assessment of changes in the ichthyofauna in a tropical reservoir in south‐eastern Brazil: Consequences of global warming?

Assessment of changes in the ichthyofauna in a tropical reservoir in south‐eastern Brazil: Consequences of global warming?

Equilibrium reproductive strategy of the peacock bass Cichla kelberi facilitates invasion into a Neotropical reservoir

Fixação de nitrogênio pelo fitoplâncton de água doce: experimentos >i<in situ>/i< e >i<in vitro>/i< para análise da influência de fatores ambientais

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