Revisiting Amazonian water types: experimental evidence highlights the importance of forest stream hydrochemistry in shaping adaptation in a fish species

Stefanelli-Silva, Gabriel; Zuanon, Jansen; Pires, Tiago

doi:10.1007/s10750-018-3860-0

Cited by 6 publications

(5 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, studies considering longer preservation periods are advised to match the average time lapse between preservation and biomass estimations. Accordingly, we also suggest studies in other regions since the local features of the watersheds regarding soil composition and inorganic components may be different between these regions (Stefanelli-Silva et al, 2019;Klippel et al, 2020) and may affect preservative solutions.…”

Section: Discussionmentioning

confidence: 73%

Effects of formaldehyde preservation time on the length-weight relationship of the ubiquitous neotropical cladoceran Ceriodaphnia silvestrii

et al. 2021

View full text Add to dashboard Cite

Aim In this study, the effect of preservation time on total body length and dry weight of adult specimens of the neotropical cladoceran Ceriodaphnia silvestrii preserved with 4% formalin solution were examined. Methods The relationship between these variables was examined under increasing gradual time effects (i.e. 7, 30, and 60 days) after preservation using linear models and analysis of variance. Results Total body length did not statistically differ between fresh and preserved cladocerans at any preservation time, whereas dry weight was drastically reduced with increasing preservation time, with 15, 47 and 57% weight losses. Length-weight relationships were significantly and positively related in all treatments, though higher values of slope were found for fresh and 7 days samples. Conclusions We highlight that, for Ceriodaphnia silvestrii, the use of the formalin solution as a preservation fixative is not adequate when the major interest is biomass estimation. Also, we recommend that dry weight estimations from preserved samples should be done as soon as possible. Finally, considering the preservation losses and intra-specific composition of organisms, the application of correction factors is advised since preserved samples are important in the evaluation of long-term changes of biological communities.

show abstract

Section: Discussionmentioning

confidence: 73%

Effects of formaldehyde preservation time on the length-weight relationship of the ubiquitous neotropical cladoceran Ceriodaphnia silvestrii

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In the present study, a negative correlation between EC and pH was found in clearwater rivers, which are characterized by lower concentrations of ions, compared to blackwater rivers. On the other hand, vegetation also influences the different types of Amazon rivers (Stefanelli-Silva et al, 2019), wherein clearwater and blackwater rivers are surrounded by the flood forest type called igapó, while whitewater rivers are surrounded by várzea vegetation (Junk, 1984;Sioli, 1984;Stefanelli-Silva et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

“…The igapó vegetation is composed of plant species that are specialists with respect to surviving prolonged periods of inundation, and these characteristics are directly linked to the higher concentrations of dissolved organic carbon (DOC), and consequently of humic acids, which in blackwater rivers present higher concentrations and molecular mass compared to the other two types of Amazonian rivers (Küchler et al, 1994(Küchler et al, , 2000Stefanelli-Silva et al, 2019). According to the results in the current study, it can be inferred that the forestwater interface has similar behavior as that of the blackwater rivers, due to the composition of the type of vegetation cover near the rivers, which directly impacts the physicochemical parameters of the clearwater rivers.…”

Section: Discussionmentioning

confidence: 99%

The physical-chemical characteristics of surface waters in the management of quality in clearwater rivers in the Brazilian Amazon

et al. 2021

View full text Add to dashboard Cite

The study of water quality in the Amazon region is important for understanding the functioning of ecological mechanisms. The standard that governs water quality in Brazil, including the Amazon, is Resolution CONAMA 357/05, which uses criteria inspired by standards from other countries. However, this resolution does not consider characteristics of Amazonian aquatic ecosystems, and this can lead to incorrect interpretation of the data. Furthermore, there are few studies on the physical-chemical characteristics of clearwater rivers in the Amazon and the influence of the forest-water interface. Therefore, water samples were collected from four clearwater tributary watersheds of the Amazonas and Tapajós Rivers during the dry season in the city of Santarém, Pará. Most of the points were collected in pristine areas in order to capture the natural physicochemical characteristics of clearwater rivers, as well as to show the importance of ecoregional aspects in water quality management. All samples were below pH 6.0, which represents non-compliance with the CONAMA resolution. Statistical tests yielded negative correlations between pH and conductivity (r = −0.87, p < 0.05), Therefore, the rivers of lower ionic load are influenced by the type of surrounding vegetation, which are characteristics that have been widely reported for blackwater rivers.

show abstract

“…We collected dead leaves from a natural sailfin tetra forest stream habitat and added them to the water used in our experiment to create a natural water condition. The plant material was left to leach for 10 days, and 1 kg (wet weight) of plant material was used per 100 l of water, in order to increase spawning success rate [71]. We set couples into individual tanks (40 x 30 x 30 cm), each containing two spawning sites (PVC pipes 10 cm long and 2.5 cm in diameter) and an artificial plant.…”

Section: Methodsmentioning

confidence: 99%

Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus

et al. 2019

Self Cite

View full text Add to dashboard Cite

In the absence of constraints, preference for larger mates is expected to evolve, as larger individuals are typical of higher potential fitness. Large females are often more fecund and carry larger eggs (which result in higher number and better quality of offspring), whereas large males usually have more conspicuous ornaments and are better at defending resources. However, intrasexual competition can constrain the access to larger partners, especially when opportunities for mate takeover abound. Here we investigate the relationship between individual’s size and mate choice in relation to one’s own size and their respective mate’s size using the sailfin tetra, a sexually dimorphic Amazonian fish species. We show that ornaments of larger males are exponentially more conspicuous, and larger females are more fecund and carry larger eggs. Contrary to expectation, neither males nor females associated for longer with the larger of two offered potential mates. Instead, individuals of both genders chose opposite-sex individuals of similar sizes to themselves. Additionally, similar-sized pairs were more likely to spawn than couples with higher size asymmetries. Grounded on field observations, we propose that prudent choice should be particularly important in this system, since courtship is long (often taking several days), which offers opportunities for mate takeover. Intrasexual competition, however, cannot readily explain female choice for similar-sized males. We thus suggest that such preference might be best explained by avoidance of filial cannibalism.

show abstract

Revisiting Amazonian water types: experimental evidence highlights the importance of forest stream hydrochemistry in shaping adaptation in a fish species

Cited by 6 publications

References 49 publications

Effects of formaldehyde preservation time on the length-weight relationship of the ubiquitous neotropical cladoceran Ceriodaphnia silvestrii

Effects of formaldehyde preservation time on the length-weight relationship of the ubiquitous neotropical cladoceran Ceriodaphnia silvestrii

The physical-chemical characteristics of surface waters in the management of quality in clearwater rivers in the Brazilian Amazon

Someone like me: Size-assortative pairing and mating in an Amazonian fish, sailfin tetra Crenuchus spilurus

Contact Info

Product

Resources

About