Methods: Increasing feasibility of total blood cell count analysis in field studies: Effects of plastic tubes and storage duration

Comparative Biochemistry and Physiology Part A Molecular & Integrative Physiology, Journal Year: 2025, Volume and Issue: unknown, P. 111834 - 111834

Published: March 1, 2025

Language: Английский

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Differential effects of foraging strategies on carotenoid‐derived plumage color and individual quality in stripe‐tailed yellow finches

Journal of Avian Biology, Journal Year: 2025, Volume and Issue: 2025(2)

Published: March 1, 2025

Carotenoid‐based plumage color is crucial in avian mate selection, often serving as an indicator of individual quality. To determine whether carotenoid‐derived can be a sign condition and if there relationship between individual's production, it necessary to identify how carotenoids are acquired by individuals subsequently used the organism. Our objective was carotenoid pigments stripe‐tailed yellow finch Sicalis citrina , species wherein females exhibit light yellowish ventral while males bright yellow. By using carbon nitrogen stable isotope analyses we were able these colors signal terms physiological stress body condition. Females with low δ 13 C values (≈ −18‰) indicating consumption 3 4 seeds, exhibited shifted toward longer wavelengths better condition, those such shifts also had higher concentrations. In contrast, brighter 15 N values, greater arthropods. Males more saturated patches concentrations, shorter or lower H/L ratios, i.e. less stress, high suggesting that they supplement their diet arthropods ( ≈ 5‰). results show dynamics finches differ sexes highlight food sources impact ornamentation. study indicates sexual dimorphism extends beyond deeper ecological differences.

Language: Английский

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Intrinsic factors influence a physiological measure in a forest bird community: adults and females have higher H/L ratios than juveniles and males

Journal of Avian Biology, Journal Year: 2025, Volume and Issue: 2025(2)

Published: March 1, 2025

Physiological parameters have the potential to serve as valuable early warning indicators for conservation of animal populations. However, measuring physiological adaptations in wildlife is often challenging, due intrinsic differences causing natural variations measures between individuals across species. This study aimed at addressing this by investigating influence factors, including sex, age, body condition, and incubation eggs on H/L ratio a forest bird community. As measure, we used heterophil lymphocyte (H/L) belonging different species community, which was assessed using novel deep learning approach based convolutional neural networks (CNNs) applied whole blood smear scans. Using phylogenetically controlled Bayesian analyses species, found higher ratios adult birds than juveniles observed slightly females males. While condition had no effect ratio, incubating tended non‐reproductive birds, regardless their sex. Furthermore, robust phylogenetic signal studied Our results reveal significant general patterns factors

Language: Английский

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Energy expenditure of Adélie penguins during the breeding season: females pay the cost in years of low food availability

Animal Behaviour, Journal Year: 2025, Volume and Issue: 222, P. 123144 - 123144

Published: March 18, 2025

Language: Английский

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Leukocyte Coping Capacity: An Integrative Parameter for Wildlife Welfare Within Conservation Interventions

Frontiers in Veterinary Science, Journal Year: 2019, Volume and Issue: 6

Published: April 11, 2019

Wildlife management, conservation interventions and wildlife research programs often involve capture, manipulation transport of wild animals. Widespread empirical evidence across various vertebrate taxa shows that handling generally induces a severe stress response resulting in increased levels. The inability individuals to appropriately respond rapidly changing environmental conditions during after manipulations may have deleterious long-lasting implications on animal welfare. Therefore, mitigating responses the frame is key welfare factor. However, we poor understanding metrics adequately assess monitor dynamic physiological changes animals undergo when subjected stressful procedures or captive conditions. A growing number studies provide good for reciprocal interactions between immune processes stress. Here, review existing literature relatively new technique - Leukocyte Coping Capacity (LCC), proxy quantifying oxygen radical production by leukocytes. We discuss strength weaknesses this immunological approach evaluate stress, individual capacity cope with potential Additionally present data LCC roe deer (Capreolus capreolus) under long-time anesthesia free-ranging Asiatic asses (Kulan; Equus hemionus kulan) were was used levels captured reintroduction project.

Language: Английский

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Micronucleus Test Reveals Genotoxic Effects in Bats Associated with Agricultural Activity

Environmental Toxicology and Chemistry, Journal Year: 2020, Volume and Issue: 40(1), P. 202 - 207

Published: Dec. 7, 2020

Abstract Bats play a vital role in our ecosystems and economies as natural pest‐control agents, seed dispersers, pollinators. Agricultural intensification, however, can impact bats foraging near crops, affecting the ecosystem services they provide. Exposure to pesticides, for example, may induce chromosome breakage or missegregation that result micronucleus formation. Detection of micronuclei is simple, inexpensive, relatively minimally invasive technique commonly used evaluate chemical genotoxicity but rarely applied assess wildlife genotoxic effects. We evaluated suitability test biomarker biomonitoring field studies bats. collected blood samples from insectivorous roosting caves surrounded by different levels disturbance (agriculture, human settlements) Colima Jalisco, west central Mexico. Then, we examined frequency inclusions erythrocytes using differentially stained smears. proportionately more (53%) land agriculture irrigated year‐round had higher than less disturbed site (15% agriculture). conclude sensitive method effects free‐ranging could provide useful evaluating risk exposure wild populations. Environ Toxicol Chem 2021;40:202–207. © 2020 SETAC

Language: Английский

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Short-term stressors and corticosterone effects on immunity in male toads (Rhinella icterica): A neuroimmune-endocrine approach

Brain Behavior & Immunity - Health, Journal Year: 2021, Volume and Issue: 13, P. 100230 - 100230

Published: Feb. 27, 2021

In the last decades, it is growing idea that stress-induced immunomodulation bimodal: with acute stress associated enhancing effects while chronic suppressive effects. However, immune-endocrine interactions and its implications are often overlooked in ectotherms. We investigated impact of corticosterone (CORT) treatment short-term stressors on CORT plasma levels immunity male toads (Rhinella icterica), using three distinct protocols: restraint, immune challenge (with lipopolysaccharide, LPS), transdermal application (TA). Our results showed increased neutrophil: lymphocyte ratio (NLR) regardless input (restraint, LPS challenge) or TA. meantime, bacterial killing ability (BKA) was not affected by any treatment, suggesting this parameter might be a more constitutive robust response. Interestingly, cellular response patterns. Increased phagocytosis blood leukocytes phytohemagglutinin edema followed TA (15 ​μg), respectively. contrast, peritoneal decreased after (1 10 indicating increases impair local function. Such differences also doses interaction between other mediators, such as melatonin, testosterone, cytokines. Overall, our highlight immune-enhancing TA, complexity anurans. It highlights relevance investigating contexts for increase arising from different situations, well diverse components better understanding immunomodulation.

Language: Английский

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Non‐lethal effects of climate change and infectious disease: An energetics approach to understanding population impacts

Functional Ecology, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 22, 2025

Abstract Climate change and infectious disease jointly impact species worldwide. In addition to causing conspicuous mortality events, these threats produce a range of non‐lethal effects that are often overlooked, yet can affect individual survival fecundity, ultimately, population viability. We develop an energetic framework structures the study climate their downstream demographic consequences. The identifies pathways by which acquisition, storage mobilisation energy required for organismal reproduction. joint disease, while non‐lethal, reduce fitness increasing demands, exacerbating trade‐offs accelerating physiological ageing. Considering mechanisms underlying explain when why recurrent and/or chronic events associated with be important limiting forces populations species. Read free Plain Language Summary this article on Journal blog.

Language: Английский

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An Evaluation of HSP70 Protein Abundance in the Blood Cells of Free-living Common Loons (Gavia immer)

Waterbirds, Journal Year: 2025, Volume and Issue: 47(3)

Published: March 6, 2025

Language: Английский

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Assessing the interconnected behavioral and physiological underpinnings of amphibian responses to fungal infection

Physiology & Behavior, Journal Year: 2025, Volume and Issue: unknown, P. 114951 - 114951

Published: May 1, 2025

Language: Английский

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