Profile of cortisol, glycaemia, and blood parameters of American Bullfrog tadpoles Lithobates catesbeianus exposed to density and hypoxia stressors

Teixeira, Patrícia Santos; Dias, Danielle de Carla; Rocha, Gerôncio Albuquerque; Antonucci, Antonio; França, Fernanda Menezes; Marcantonio, Adriana Sacioto; Ranzani-Paiva, María José Tavares; Ferreira, Cláudia Maris

doi:10.1590/s0100-736x2012001300016

Cited by 12 publications

(6 citation statements)

References 54 publications

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“…On the other hand, a decrease in the number of erythrocytes was observed on the 30 th day, but with increase in mean corpuscular volume, which suggested that throughout the experiment "young" red blood cells with larger volume were recruited to the blood system to give the necessary oxygen supply during the confrontations. The same way Teixeira et al (2012) observed an increase in MCV in chronic stress with the same species. In field, on the 15 th and 30 th days, an increase in the number of erythrocytes was observed in the animals subjected to D200, but with decrease in the mean corpuscular volume, which suggested the presence of "mature" red blood cells with lower volume, a sign of no stress condition.…”

Section: Experiments Of Stress Caused By Densitysupporting

confidence: 71%

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Bullfrog Hemogram Under Management Stress

et al. 2015

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Stress is one of the major obstacles in frog culture and can be caused by factors such as inappropriate farming systems; inadequate management among other situations. The objective of the present study was to assess the hemogram, erythrogram and leukogram of bullfrogs (L. catesbeianus) when exposed to stress caused by different types of management: density and handling (manipulation), developed in the laboratory and repeated in the field for the appropriate comparisons in a experimental period of 30 days. The density experiment was conducted with four treatments: 70 animals m -2 (D70); 100 animals m -2 (D100), Control; 150 animals m -2 (D150) and 200 animals m -2 (D200), with 10, 14, 21 and 28 animals/box in the laboratory, respectively. Each treatment was performed with three simultaneous replicates. The handling experiment was conducted with three treatments: Treatment Without Handling (WH); Treatment with Partial Handling (PH) every 15 days and Treatment with Total Handling (TH) every 15 days. Each treatment was performed with four simultaneous replications. The methodology of the blood analysis followed international recommendations. In the present study we could observe that the animals of the field experiment did not reflect the same stress response observed in the laboratory in both experiment, which demonstrated the plasticity of these animals.Index terms: L. catesbeianus; density; handling; physiological response; hematology. RESUMOO estresse é um dos maiores obstáculos na criação de rãs e pode ser causado por fatores como sistemas de criação inapropriados; manejos inadequados bem como outras situações. O objetivo do presente estudo foi avaliar o hemograma, eritrograma e o leucograma da rã-touro (L. catesbeianus) quando expostas ao estresse de diferentes manejos: adensamento e manipulação desenvolvidos no laboratório e repetidos no campo para as devidas comparações em um período experimental de 30 dias. Termos para indexação: L. catesbeianus; densidade; manejo; resposta fisiológica; hematologia.

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Section: Experiments Of Stress Caused By Densitysupporting

confidence: 71%

“…According to Rocha et al (2010) and Teixeira et al (2012), inadequate management act as a source of stress and can contribute to alterations in hemogram in Rana catesbeiana animals.…”

Section: Introductionmentioning

confidence: 99%

Bullfrog Hemogram Under Management Stress

et al. 2015

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“…; but see Teixeira et al . ), possibly inducing long‐lasting effects on susceptibility to infection. In this respect, Saarinen & Taskinen () found increased susceptibility of the freshwater clam Anadonta piscinalis to infection by the copepod Paraergasilus rylovi up to 11 months after experiencing hyoxia for 25 days.…”

Section: Indirect Responses Of Ecosystems To Eutrophication and Host–mentioning

confidence: 99%

“…Esch et al 1986;Marcogliese, Goater & Esch 1990) can increase infection risk for hosts. Low DO concentrations were also found to cause immunosuppression in a number of systems (Direkbusarakom & Danayadol 1998;Le Moullac et al 1998;Boyd & Burnett 1999;Burnett & Stickle 2001;Wang et al 2011; but see Teixeira et al 2012), possibly inducing long-lasting effects on susceptibility to infection. In this respect, Saarinen & Taskinen (2005) found increased susceptibility of the freshwater clam Anadonta piscinalis to infection by the copepod Paraergasilus rylovi up to 11 months after experiencing hyoxia for 25 days.…”

Section: R E D U C T I O N I N D I S S O L V E D O X Y G E N C O N C mentioning

confidence: 99%

Beyond troubled waters: the influence of eutrophication on host–parasite interactions

Budria

2017

Functional Ecology

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Summary1. Recent research in biomedicine and in ecology has linked disease emergence and resurgence with human-induced environmental change. Water bodies, in particular, have dramatically changed during the past century due to artificial enrichment of nutrients from diverse sources (e.g. agriculture, forestry, waste discharges). A growing number of studies, reviewed in this synthesis, highlights how these alterations are tightly linked to changes in host-parasite interactions and impact wildlife health. 2. Direct responses of aquatic ecosystems to the disturbance include changes in the community of primary producers and cause indirect responses such as turbidity, oxygen depletion and foodweb alteration; a phenomenon known as anthropogenic eutrophication. Ultimately, eutrophication causes a wide range of effects on host-parasite interactions which should all be considered to predict infection probability and outcome in disturbed areas. 3. Future research should encompass a more fundamental and holistic view of eutrophication, considering altogether the multitude of environmental changes encountered in eutrophied sites. Stronger collaborations among disease biologists and aquatic ecologists are necessary to better understand and manage wildlife health at impacted water bodies.

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“…The production and secretion of glucocorticoids is a short‐term response, typically lasting only several days (Wasser et al , ; Romero, ). If the exposure to environmental stressors is chronic, lasting weeks or months, this may compromise the regulation of the Hypothalamus‐Pituitary‐Adrenal/Interrenal axis, inhibiting the maintenance of important organismal functions (Teixeira et al , ), such as breeding behavior and immune response (Rollins‐Smith, ). The inhibition of reproduction saves energetic resources for other processes, because reproductive activity is considerably expensive (Zerani et al , ).…”

Section: Introductionmentioning

confidence: 99%

Leukocyte profiles of two neotropical anuran species affected by anthropogenic habitat alteration

Neto

Nowakowski

Silva

et al. 2020

Animal Conservation

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Many amphibian species are vulnerable to environmental changes, especially in the tropics where presumably a large number of species have evolved narrow niches. Rapid environmental changes, such as deforestation, may promote stress responses in anurans that could affect population viability. The stress response in vertebrates is highly conserved, often involving the liberation of glucocorticoids hormones and the recruitment of immune competent cells. The objective of this work was to evaluate leukocyte profiles among individuals of two neotropical anuran species affected by anthropogenic habitat alteration. We took blood samples from adult individuals of Physalaemus cuvieri and Scinax x-signatus in natural and converted habitats in NE Brazil. We analyzed differential leukocyte counts, where increases in neutrophils and decreases in lymphocytes are indicative of a stress response. Specimens of S. x-signatus captured in highly altered habitats presented a higher neutrophil:lymphocyte (N: L) ratios than individuals from natural habitats. In contrast, P. cuvieri individuals exhibited no difference in N:L ratios between habitat types. These results suggest that the immune response depends on the species and the level of habitat alteration. Although S. x-signatus can be considered a generalist species, individuals from this species exhibited increased stress response associated with habitat alteration. The lack of a strong stress response of P. cuvieri, may suggest that this species is more tolerant of habitat alteration or that those individuals have acclimated to anthropogenic stressors more rapidly than S. x-signatus. These variable responses of immune function in highly altered habitats suggest avenues for future experimental work that examines responses to multiple stressors, including disease, which could scale to population trends in altered habitats.

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Profile of cortisol, glycaemia, and blood parameters of American Bullfrog tadpoles Lithobates catesbeianus exposed to density and hypoxia stressors

Cited by 12 publications

References 54 publications

Bullfrog Hemogram Under Management Stress

Bullfrog Hemogram Under Management Stress

Beyond troubled waters: the influence of eutrophication on host–parasite interactions

Leukocyte profiles of two neotropical anuran species affected by anthropogenic habitat alteration

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