7 results on '"Figueiredo, Bruno"'
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2. Acute Ecotoxicity of Exposure to Sugarcane Ashes on the Behaviour of Predator and Prey Fish Species.
- Author
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Yofukuji, Katia Y., Gonino, Gabriel M. R., Alves, Gustavo H. Z., Lopes, Taise M., and Figueiredo, Bruno R. S.
- Subjects
FORAGE fishes ,SUGARCANE ,PREDATORY animals ,AQUATIC organisms ,BODIES of water ,PREDATION ,ASH (Combustion product) ,WATER pollution - Abstract
Sugarcane, one of the world's major crops, is used to produce sucrose and biofuel. Before harvesting, sugarcane is burned to facilitate manual cutting, generating ashes that may reach water bodies and cause the death of aquatic organisms. While studies have addressed the lethal effects of sugarcane ashes (SCA) on different fishes, little is known about the effects of sublethal SCA concentration on aquatic organisms. In this study, we evaluated the behaviour of a piscivorous (Hoplerythrinus unitaeniatus) and an invertivorous (Moenkhausia forestii) fish species, after a short-term (24 h) exposure to a sublethal concentration of SCA (0.8 g L
−1 ). We hypothesized that the outcomes of predator–prey interaction would change when the players are subjected to sublethal SCA concentration. Our findings revealed that neither the behaviours of predator and prey fish species nor the outcome of their interactions was changed by the exposure to sublethal SCA concentrations, suggesting that their behavioural traits were not particularly sensitive to SCA. However, we emphasize that (i) other predatory and anti-predator behavioural traits could be affected by SCA even at under 0.8 g L−1 concentration and (ii) higher concentrations of SCA and/or long-term exposure may trigger profound changes in the behaviour of predator and prey fish species. Our findings are worrisome because there are new public policies to expand sugarcane production in Brazil, with the possibility of continuing burning sugarcane crops across the country. This will increase the input of SCA into aquatic systems, generating more prominent and pervasive negative impacts than those evaluated in this study. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
3. Negative effect of turbidity on prey capture for both visual and non‐visual aquatic predators.
- Author
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Ortega, Jean C. G., Figueiredo, Bruno R. S., Graça, Weferson J., Agostinho, Angelo A., Bini, Luis M., and O'Gorman, Eoin
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PREDATORY aquatic animals , *TURBIDITY , *PREDATION , *BODY size , *PREDATORY animals - Abstract
Turbidity plays an important role in aquatic predator–prey interactions. Increases in turbidity are expected to reduce prey capture rates, especially for visually oriented predators. However, there is also evidence indicating that turbidity may have little or no effect on predation rates.Here, we conducted a systematic review and meta‐analysis of the relationship between turbidity and capture rate. We explored possible sources of heterogeneity in the effect sizes (capture strategy, predator's body size, relative eye size and turbidity range in the experiments) while controlling for the dependence among effects sizes and phylogenetic relationships among predator species.We found a consistent negative effect of turbidity on prey capture and that turbidity range (manipulated in the experiments) was the main factor accounting for between‐study variation in effect sizes. Also, capture rates of both visually and non‐visually oriented predators decreased with an increase in turbidity. In addition, for visually oriented fish predators, the relative eye size did not influence the effect sizes.Despite the paucity of studies for some groups of aquatic predators (mainly in tropical regions), we provide corroborative evidence that turbidity is a critical environmental factor controlling predator–prey interactions. This result is especially relevant considering that changes in turbidity is a human‐induced pervasive environmental alteration resulted from, among other mechanisms, runoff after deforestation, eutrophication or oligotrophication in reservoir cascades, which imply changes in predator–prey interactions. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
4. Trophic interactions between predator-fishes and invertebrate-prey in different environmental scenarios
- Author
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Figueiredo, Bruno Renaly Souza, Evanilde Benedito, Angelo Antonio Agostinho - Nupélia/UEM, Luiz Carlos Gomes - Nupélia/UEM, Rafael Dettogni Guariento - Universidade Federal do Mato Grosso do Sul (UFMS), and Mário Luís Orsi - Universidade Estadual de Londrina (UEL)
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Heterogeneidade de habitat ,Brasil ,Habitat heterogeneity ,Comportamento antipredatório ,Peixes de água doce ,Predation ,Predação (Ecologia) ,Animal behaviour ,Insetos aquáticos ,Comportamento animal ,Ecologia ,Interação predador-presa ,Experimentação animal ,Aquatic insects ,Ecologia de água doce ,Animal experimentation ,Invertebrados de água doce ,Brazil ,Ciências Biológicas ,Predator-prey interaction - Abstract
The survival of a given prey is primarily determined by their capacity to recognize and respond to the current predation threat degree. Such prey responses could be more or less effective according to environmental characteristics, such as visibility conditions and temperature. However, the evolutionary time of co-occurrence between predators and prey could also be a crucial factor to shape the appropriated prey response to predator strike. Fluctuations in environmental conditions are expected to be more frequent as a result from global warming, which has been catalysed by human being?s actions. Therefore, it is quite timely investigate the influence of environmental shifts on the outcomes of predator-prey encounters. Here, we used an experimental approach to observe the prey capture efficiency of fish-predators and anti-predator behaviour of some groups of invertebrates (aquatic insects and amphipods) in distinct ecological scenarios of underwater visibility, water temperature and presence/absence of refuge (provided by aquatic macrophyte). Also, we investigated the consequences of species invasions for the interaction between predators and preys on two perspectives: after the establishment of a non-native aquatic plant (Hydrilla verticallata), and after the introduction of a non-native piscivorous fish. In reduced water transparency, fish consumed fewer invertebrates than in clear water, but the efficiency in capturing invertebrates of mesopredators was strongly reduced when top-predator was present and water transparency low. Therefore, the mere presence of a top predator has potential to increase invertebrate survive, but underwater visibility is impaired mesopredator do not know the exact top predator location, then they tend to reduce their mobility to decrease the likelihood to be eaten, such response can concomitantly limits the mesopredator predatory potential. Despite of the literature supports the positive relation between water temperature and the distance travelled by predators, which often results in better feeding efficiency in warmer waters, Gymnogeophagus terrapurpura showed similar amount of amphipods (Hyalella curvispina) consumed in four different water temperature (19.2; 22.2; 25.2 and 27ºC). In contrast, amphipods show more conspicuous anti-predator behaviour at 27ºC. In addition, we found that non-native aquatic plants are recognized as a safe habitat and used by prey fish as refuge in a similar proportion than native plants are. We also found that the predation pressure performed by Astyanax altiparanae on one pelagic invertebrate population (Daphnia magna) was extremely high in treatments with the native piscivorous Hoplias aff. malabaricus. However, in treatments with the non-native Astronotus crassipinnis, the survival of pelagic invertebrates was proportional to benthic prey population (Chironomus sancticaroli). Therefore, the introduction of a piscivorous fish has potential to change the energy pathway in the entire ecosystem. Simulating observed and predicted ecological scenarios, even in microcosm, allow us to understand the main effect of a given variable on predation in the wild, and possible interactive effect among multiple variables. Knowing the factors that influence the predation can help ecologists to propose management project for fish and invertebrates species. A sobrevivência de uma determinada presa depende de sua habilidade em reconhecer a presença do predador, e da eficiência das estratégias de anti-predação que ela emprega. Tais estratégias geralmente podem ser mais ou menos efetivas dependendo das condições de visibilidade, de temperatura e do período de coocorrência entre predadores e presas. Considerando que flutuações nas condições ambientais se tornarão eventos mais frequentes em virtude do aquecimento global, faz-se necessário investigar a influência de tais flutuações para o resultado da interação predador- presa. Neste estudo, utilizou-se uma abordagem experimental para observar a eficiência na captura de presas por peixes-predadores e o comportamento anti-predatório de invertebrados-presa (espécies de insetos, de anfípodes e de microcrustáceos) em cenários contrastantes de visibilidade subaquática, de temperatura da água e de disponibilidade de refúgio (provido por plantas aquáticas). Além disso, observou-se a implicação da invasão de espécies não-nativas para a interação entre predadores e presas sob duas perspectivas: após o estabelecimento de uma planta aquática não-nativa (Hydrilla verticillata), e após a introdução de um predador piscívoro não-nativo (Astronotus crassipinnis). De maneira geral, observou-se que a redução na transparência da água reduziu a eficiência na captura de invertebrados por peixes, e essa redução foi mais acentuada quando predadores piscívoros coocorreram com os peixes mesopredadores. A mera presença de predadores de topo aumenta a sobrevivência de invertebrados, mas a presença deles em condições de baixa visibilidade subaquática reduz sobremaneira o potencial predatório de peixes mesopredadores, os quais provavelmente utilizam mais tempo em comportamentos de vigilância, e reduzem a ingestão de presas. É predito que a elevação da temperatura aumente a frequência de eventos relacionados à busca e à captura de alimento por predadores, Gymnogeophagus terrapurpura apresentou similares taxas de consumo de anfípodes (Hyalella curvispina) em diferentes temperaturas da água (19,2; 22,2; 25,2 e 27ºC). Apesar disso, na temperatura mais elevada anfípodes apresentaram um comportamento anti-predatório mais conspícuo. Verificou-se ainda que plantas aquáticas não-nativas são reconhecidas como habitat seguro, e são utilizadas como refúgio por presas na mesma proporção que plantas nativas. A pressão de predação exercida por Astyanax altiparanae sobre uma população de invertebrados pelágicos (Daphnia magna) foi extremamente intensa em tratamentos com o piscívoro nativo Hoplias aff. malabaricus, contudo, nos tratamentos com piscívoro não-nativo A. crassipinnis a sobrevivência de presas pelágicas foi proporcional a sobrevivência de presas bentônicas (Chironomus sancticaroli). A introdução de um piscívoro tem a capacidade de mudar a fonte do recurso alimentar de mesopredadores, com potenciais implicações para o fluxo de energia dentro do ecossistema. Simular, em microcosmo, cenários ambientais observados e preditos fornece subsídio para a determinação de tamanho de efeitos de variáveis isoladas, e de possíveis interações entre tais variáveis, que podem auxiliar para o manejo de espécies de peixes e invertebrados dependentes das condições ambientais para a manutenção de suas funções vitais, garantido a preservação da espécie e a conservação da vida. 106 f
- Published
- 2016
5. Turbidity amplifies the non-lethal effects of predation and affects the foraging success of characid fish shoals.
- Author
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Figueiredo, Bruno R. S., Mormul, Roger P., Chapman, Ben B., Lolis, Lucas A., Fiori, Leandro F., and Benedito, Evanilde
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AQUATIC resources , *CHARACIDAE , *TURBIDITY , *PREDATION , *FISH nutrition - Abstract
In aquatic systems, many species rely primarily on visual cues to choose optimal foraging sites, capture prey and avoid potential threats. Increases in the turbidity of water reduce visibility and impede animals in determining the precise location of both predators and food. How individuals balance foraging decisions with anti-predator behaviour in turbid environments is not well understood., We tested the effects of turbidity and predation risk on the foraging behaviour and feeding of an invertivorous fish, Moenkhausia forestii (Characidae), using a mesocosm experiment with a 2 × 2 design, crossing water clarity (clear versus turbid) with predation risk as reflected by the presence or absence of the piscivorous wolf-fish Hoplias aff. malabaricus (Erythrinidae). We predicted that turbidity and predator presence would interact additively to reduce foraging rates, and that increased turbidity or predator presence would result in disproportionate food partitioning among shoal members., The combination of high turbidity and predator presence resulted in a significant reduction in prey consumption. Foraging success exhibited a skewed distribution in the turbid treatment, i.e. there was a decreased evenness of food partitioning within shoals. Hence, both turbidity and predator presence affect the prey consumption and foraging behaviour of invertivorous fish, with turbidity amplifying the non-lethal effects of predation risk on foraging success., Our results imply that turbidity-induced visual obstruction amplifies the negative effects of predator presence on invertivorous fish feeding behaviour, resulting in higher prey survival. Also, our finding that food intake by an intermediate consumer decreased in turbid water with a top predator lends no support to the hypothesis that intermediate consumer fish reduce their anti-predator behaviour in turbid water., From a management perspective, our findings suggest that the oligotrophication of aquatic systems could dramatically increase predation on basal prey organisms naturally adapted to turbid waters, and reduce within-shoal differences in feeding behaviour. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
6. Swimming and hiding regardless of the habitat: prey fish do not choose between a native and a non-native macrophyte species as a refuge.
- Author
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Figueiredo, Bruno, Mormul, Roger, and Thomaz, Sidinei
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AQUATIC habitats , *FISH ecology , *PREDATION , *ANTIPREDATOR behavior , *BIOLOGICAL evolution , *SWIMMING , *MACROPHYTES , *AMPHIBIANS - Abstract
The ability to respond to a predation threat may be the key factor influencing prey survival. Thus, small-sized fish may adapt to use macrophyte patches as refugia in ecosystems where they face predators. We evaluated the habitat choices of a small fish species ( Serrapinnus notomelas) to determine whether these fish prefer native versus recently introduced submerged macrophyte stands in the context of predator avoidance. Specifically, we applied three predator cue treatments: no cue, chemical cue from a hungry predator and presence of a satiated predator. First, we empirically tested the theoretical assumption that the prey fish use vegetated habitats and that the presence of an actual predator has a stronger effect on the choice of habitat than simply a chemical cue. Then we tested the hypothesis that prey do not choose a habitat according to macrophyte species and whether this pattern changed as a result of increasing predation risk. We found that the prey fish preferred vegetated habitats; however, they did not appear to distinguish native from invasive macrophytes. Our results support the hypothesis that the physical structure of macrophytes is more important in determining habitat choice than the evolutionary relationship between the fish and the native macrophyte species. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
7. Short-Term Interactive Effects of Experimental Heat Waves and Turbidity Pulses on the Foraging Success of a Subtropical Invertivorous Fish.
- Author
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Figueiredo, Bruno R. S., Calvo, Clementina, López-Rodríguez, Anahí, Mormul, Roger P., Teixeira-de Mello, Franco, Benedito, Evanilde, and Meerhoff, Mariana
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TURBIDITY ,ATMOSPHERIC turbidity ,PREDATION ,CICHLIDS ,CLIMATE extremes ,FISH populations ,HEAT pulses - Abstract
Sudden increases in temperature and turbidity in aquatic ecosystems are expected for different regions in the future, as a result of the more frequent extreme climatic events that are predicted. The consequences of these abrupt changes in the outcomes of predator–prey interactions are unknown. Here, we tested the effects of a heat wave and a turbidity pulse on the foraging success of a subtropical cichlid fish (Gymnogeophagus terrapurpura) on amphipods (Hyalella curvispina). We carried out a short-term experiment combining treatments of turbidity (3 and 100 nephelometric turbidity units [NTU]) and water temperature (19.2, 22.2, 25.2 and 27.0 °C), considering potential differences given by fish length. Changes in water temperature did not promote significant changes in prey consumption. Higher turbidity, in contrast, decreased prey consumption. Also, we found that fish with different body lengths consumed a similar amount of prey under clear waters, but, in turbid waters, bigger individuals were more efficient than the smaller individuals. This finding is an empirical demonstration that the effect of increased turbidity on predation rate depends upon predator body size, and it suggests that bigger body sizes may help overcome turbidity-associated limitations in finding and capturing prey. Our short-term results suggest that, if turbidity pulses and heat waves become more frequent in the future, the outcome of fish–invertebrate interaction can be affected by local characteristics such as fish population size distribution. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
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