Ecophysiological interactions and water-related physicochemical parameters among freshwater stingrays

Abstract

The objective of this study was to compare and correlate the ecology of neonates and young individuals of Potamotrygon wallacei, Potamotrygon motoro and Paratrygon aiereba with regard to their hematological profile and the physicochemical parameters of the water that they inhabit. Principal component analysis (PCA) on the complete blood count revealed total variation of 72.92%, thus demonstrating a differentiation system for oxygen demand. On the other hand, P. motoro was considered to be an intermediate species, given that its complete blood count characteristics interacted with both P. wallacei and with P. aiereba. The interaction among the biochemical variables was shown to total 64.67% of the factors. This allowed differentiation of P. wallacei from P. aiereba, while P. motoro maintained an intermediate position. These characteristics of differentiation within the preferred environment corroborate the PCA of the present study and confirm that these species can be differentiated through considering the complete blood count and biochemical parameters. The PCA on water properties showed 68.57% differentiation, mainly comprising the x axis (49.44%). It can be affirmed that P. motoro has the capacity to inhabit the preferential areas of P. wallacei and P. aiereba, as well as occupying localities in which other stingrays are not found. In conclusion, P. wallacei presents patterns differentiating it from P. aiereba, while P. motoro is a species that presents intermediate characteristics. The latter can be considered to be a more broadly distributed species regarding its ecophysiological characteristics.Keywords: hematology, potamotrygonids, physiology, differences, ecology. Interações ecofisiológicas e dos parâmetros físico-químico da água em arraias de água doce ResumoEste trabalho tem por objetivo investigar o perfil hematológico e os parâmetros físico-químicos da água, comparando e correlacionando ecologicamente entre neonatos e jovens de Potamotrygon wallacei (arraia cururu), Potamotrygon motoro e Paratrygon aiereba. A análise de componentes principais (PCA) do hemograma revelou um total 72,92% de variação, constituindo-se em um sistema de diferenciação na demanda por oxigênio. P. wallacei apresenta diferenciação no eixo X quando comparada a P. aiereba, por outro lado P. motoro constitui-se como uma espécie intermediária que apresenta as características do hemograma interagindo tanto com P. wallacei quanto com P. aiereba. A interação entre as variáveis bioquímica demonstram um total de 64,67% dos fatores, no qual foi possível diferenciar, a arraia P. wallaceiBraz.

Hematology and blood biochemistry profile of the freshwater stingray Potamotrygon magdalenae as a tool for population assessment in artificial environments

“…Although some females showed presence of eosinophils, cells related with parasite and antigen control (Semeniuk et al, 2009;Smith et al, 2014), we did not find other evidence of parasite infection such as nuclei distribution of erythrocytes due to parasitic gametocytes (Oliveira et al, 2016a), poor body condition, low values of MCH and MCHC, or significant correlations among this parameters, which allows us to indicate that parasites could not be the best explanation for our results. Additionally, although we did not conduct any hemoparasitic assessment in our animals, no ectoparasites were found in any animal (based on a recurrent environmental and physical monitoring of the animals in their artificial environment).…”

“…Additionally, although we did not conduct any hemoparasitic assessment in our animals, no ectoparasites were found in any animal (based on a recurrent environmental and physical monitoring of the animals in their artificial environment). However, we highlight the importance of periodic microbiological assessments (endo, exo and hemo parasites) in artificial environments in order to control parasite loads and prevent health issues previously reported in freshwater stingrays (Ross, 2004;Lacerda et al, 2009;Oliveira et al, 2016a).…”

“…Conditions of DO, temperature and pH in ex situ habitats designed for P. magdalenae were highly similar to wildlife conditions (mean ± SD DO = 4.89 ± 1.05 mg/L, temperature = 28.66 ± 0.49 and pH = 7.95 ± 0.61; Pérez-Rojas, 2020) allowing us to infer that our results for the red blood parameters could be a natural physiologic feature for the species. However, water quality and habitat preferences of the species, as well as captivity effects can be reflected in variation of red blood parameters (Semeniuk et al, 2009;Oliveira et al, 2016a;Grant and Campbell, 2020), we highlight the importance of assessing physiological status of wildlife populations of P. magdalenae.…”

Growth and hematological responses of tambaqui, Colossoma macropomum fed different levels of rice, Oryza spp.

“…The physiological parameters in fish are widely used to establish the state of health of these vertebrates (Castro et al, 2021;Nascimento et al, 2020a;Oliveira et al, 2017;Oliveira et al, 2016;Oliveira et al, 2015). Considering that knowledge of the state of health of a species is very important for fish farming, and in order to improve knowledge regarding supplementary feeding using regional ingredients, the aim of the present study was to explain issues regarding use of wild rice for feeding farmed tambaqui.…”

Effect of Diets With Different Lysine Levels on the Hemograms of Juvenile Tambaqui Colosssoma Macropomum (CUVIER, 1818)

“…Hematological analysis in monitoring the sh physiology is a consolidated methodology, with simple sampling, and promotes reliable results regarding the animal's health (Aride et al 2016(Aride et al , 2018(Aride et al , 2020Castro et al 2020;Lima et al 2020;Nascimento et al 2020;Oliveira et al 2016Oliveira et al , 2017Burgos et al 2019).…”