Feeding aspects of Knodus heteresthes (Eigenmann, 1908) and Moenkhausia lepidura (Kner, 1858) (Characiformes, Characidae) in the Teles Pires and Juruena Rivers, southern Amazon

Oliveira, Edvagner; Ignácio, Áurea Regina Alves; Lázaro, Wilkinson Lopes; Muniz, Claumir César; Campos, Derick Victor de Souza; Costa, J. V. M.; Ribeiro, Thamy S.; Santos-Filho, Manoel dos

doi:10.1590/1519-6984.226136

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…The reasons that generate associations among fish species study are unknown, but may represent factors such as interspecific feeding associations, partial sharing of habitats (Pacheco and da Silva, 2009) and trophic relationships (Novakowski et al, 2007;Oliveira et al, 2020), however it is common fish species presenting similar feeding behavior and living in the same space, however, these usually have different foraging methods, suggesting that behavioral differences are essential to species coexistence (Mise et al, 2013). However, aggressive interactions are common among fish of the same guild and individuals of each species can obtain advantages in feed efficiency over other individuals from other species of the same trophic guild (Menegatti et al, 2003).…”

Section: Diet Compositionmentioning

confidence: 99%

Trophic relationships among three species of ornamental fish from the region of Lake Amanã, Amazon

et al. 2022

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The present study objectified to evaluate the trophic relationships and the possible aggressive mimicry involving Carnegiella strigata, Carnegiella marthae and Gnathocharax steindachneri, in lowland forest streams. Samplings occurred in November 2002, March and August 2003 in Amanã Sustainable Development Reserve (ASDR). The total of 943 fish was caught, being 79.43% of C. marthae, 3.18% of C. strigata and 17.39% of G. steindachneri. Stomach contents, degree of stomach repletion, relative volume and frequency of occurrence of food items were evaluated. Thirteen food items were identified, and the presence of terrestrial and aquatic insects indicates the high dependence of these species and the flooded forest. Low feeding overlap was observed between Carnegiella strigata and C. marthae compared to Gnathocharax steindachneri. However, the overlap between the two Carnegiella species was relatively high, which could explain the low frequency of syntopic occurrence among these species, suggesting a possible case of competitive exclusion.

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Section: Diet Compositionmentioning

confidence: 99%

Trophic relationships among three species of ornamental fish from the region of Lake Amanã, Amazon

et al. 2022

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“…Moreover, when released into the water, high inputs of nutrients from human activities often have severe effects on the fish and invertebrate communities and can homogenize the type of resources available (Baeta et al 2017, Alonso et al 2019. This pollution alters the contribution of allochthonous and autochthonous resources available, which changes the feeding habits of fish (Ganassin et al 2020) and forces an adjustment in their diets when facing different habitat conditions (Alonso et al 2019, Oliveira et al 2021. Thus, species with trophic plasticity have the advantage of being able to shift their diet in response to environments with different shifts in resource availability (Welker & Scarnecchia 2006, Kokubun et al 2018, Oliveira et al 2021.…”

Section: Introductionmentioning

confidence: 99%

DIET COMPOSITION, CONDITION FACTOR AND INTESTINAL COEFFICIENT OF THE FISH Astyanax lineatus REFLECT THE ANTHROPOGENIC EFFECTS ON STREAMS IN CENTRAL BRAZIL

2022

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Human activities, such as urbanization, can cause instability in the aquatic biota. This instability can modify aquatic food resource availability, consequently shifting the diet composition of fish. Because the diet consumed by fish closely affects the anatomy of their digestive tract, it can also alter their intestinal coefficient. In this study, we analyzed the diet composition, condition factor and intestinal coefficient of Astyanax lineatus (Perugia, 1891) from two distinct habitats: a "degraded habitat" (Cabaça stream) in a reserve inside the city perimeter and a "preserved habitat" (Salobra River) in Mato Grosso do Sul State, Central Brazil. We found a total of 15 food items, all of which were found in the urban stream, with a predominance of detritus and Chironomidae larvae, and six in the natural area, with a predominance of plant remains. There was a distinct difference in diet composition between fishes in the two areas (p < 0.05, PERMANOVA); however, there was no significant difference in inter-individual variability. The most frequent food items were detritus in the "degraded habitat", while in the "preserved habitat" plant and insect remains were most frequent. The relative condition factor measured by the fish's length-weight relationship was not significantly different between the two habitats. The intestinal coefficient was significantly different between the individuals from each habitat, and it was longer in fish from the natural habitat. Therefore, even though A. lineatus is known to be a generalist species, its feeding plasticity depends on the ecological integrity of the two types of habitats.

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Green Kingfishers as Sentinel Species for Mercury Contamination in Amazon

Oliveira

Ignácio

Lázaro

et al. 2023

Arch Environ Contam Toxicol

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Mercury is a global contaminant naturally found in the Amazon; it can be biomagni ed in the aquatic trophic chain. The use of piscivorous avians for mercurial contamination biomonitoring is increasing, mainly due to the non-mobility of mercury in avian feathers. We examined the concentrations of total mercury and methylmercury in different Chloroceryle americana tissues from the Teles Pires and Juruena Rivers in the southern Brazilian Amazon. We also evaluated total mercury in small Characidae sh (potential C. americana food) in the same areas. The results evidenced high mercury concentrations, on average two-times higher in the green king shers from the Teles Pires River compared to the Juruena River; the same results were found for the sh specimens. Mercury concentrations were lowest in the muscle, followed by liver and highest in feathers. Fifty-eight per cent of the feather samples from the Juruena River and 90% from the Teles Pires River had total mercury concentrations above 5 µg/g, a level previously associated with adverse effects related to avian breeding. The methylmercury concentration was lowest in the liver, followed by feathers and highest in muscle. Although Juruena River avian feathers had a lower total mercury concentration, > 96% of the total mercury was methylmercury, the highest amount for specimens from both rivers. Highlights 1-Hg concentrations in King shers exceed the limits established by FAO; 2-Bird feathers can be considered a good indicator of mercury contamination; 3-The percentage of MeHg present in the feathers and liver shows the e ciency of the Hg excretion routes in C. americana.

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Feeding aspects of Knodus heteresthes (Eigenmann, 1908) and Moenkhausia lepidura (Kner, 1858) (Characiformes, Characidae) in the Teles Pires and Juruena Rivers, southern Amazon

Cited by 4 publications

References 34 publications

Trophic relationships among three species of ornamental fish from the region of Lake Amanã, Amazon

Trophic relationships among three species of ornamental fish from the region of Lake Amanã, Amazon

DIET COMPOSITION, CONDITION FACTOR AND INTESTINAL COEFFICIENT OF THE FISH Astyanax lineatus REFLECT THE ANTHROPOGENIC EFFECTS ON STREAMS IN CENTRAL BRAZIL

Green Kingfishers as Sentinel Species for Mercury Contamination in Amazon

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