Health of Holochilus chacarius (Rodentia: Cricetidae) in rice agroecosystem in a neotropical wetland assessed by histopathology

Small mammals have a short lifetime and are strictly associated with their environment. This work aimed to use histopathology to assess the health of Holochilus chacarius in a rice agroecosystem in the Pantanal of Mato Grosso do Sul. During necropsy, fragments of the lung, kidney, skin, liver, and r...

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Bibliographic Details
Published in:	Environmental monitoring and assessment Vol. 196; no. 4; p. 407
Main Authors:	Rodrigues, Amanda Costa, de Sá, Érica Fernanda Gonçalves Gomes, Santos, Filipe Martins, Sano, Nayara Yoshie, Pistori, Julia Gindri Bragato, Cordeiro-Estrela, Pedro, Ozório, Caio Lucca Cação Tognini, Herrera, Heitor Miraglia, de Andrade, Gisele Braziliano
Format:	Journal Article
Language:	English
Published:	Cham Springer International Publishing 01-04-2024 Springer Nature B.V
Subjects:	Agricultural ecosystems Animals Arvicolinae Atmospheric Protection/Air Quality Control/Air Pollution Bioindicators Biomonitoring Body condition Body mass Damage assessment Earth and Environmental Science Ecology Ecotoxicology Environment Environmental conditions Environmental Management Environmental Monitoring Freshwater mammals Generalized linear models Heavy metals Histopathology Holochilus chacarius Indicator species Inflammation Kidneys Lesions Liver Lungs Mammals Mathematical analysis Metals Monitoring/Environmental Analysis Necropsy Oryza Reproductive system Rodentia Sigmodontinae Statistical analysis Statistical methods Statistical models Tissue Wetlands Wildfires Histopathology Health Small mammals Bioindicator
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Summary:	Small mammals have a short lifetime and are strictly associated with their environment. This work aimed to use histopathology to assess the health of Holochilus chacarius in a rice agroecosystem in the Pantanal of Mato Grosso do Sul. During necropsy, fragments of the lung, kidney, skin, liver, and reproductive system of 33 animals were collected and submitted to histological processing. Tissue damages were evaluated as mild, moderate, and severe and arranged in a matrix for further statistical analysis. Furthermore, we used generalized linear models to verify the influence of tissue changes on the body condition, obtained by a regression between body mass and length. In the lungs, we found an intense inflammatory infiltrate associated with anthracosis that had a negative influence on the body’s condition. Also, we observed degenerative and inflammatory changes in the liver, kidneys, skin, and reproductive system that ranged from mild to moderate. The histopathological lesions observed in this study may be associated with environmental alterations of anthropic origin such as the exposure to soot from wildfires and heavy metals, evidenced by lesions in the lung, kidney, and liver. The present study provided a histopathological matrix as a new approach that allows to classify and quantify the tissue alterations. Tissue changes when associated with body condition demonstrated to be an effective tool to assess the health of small free-living mammals, showing that these animals can be used as bioindicators of environmental condition.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0167-6369 1573-2959
DOI:	10.1007/s10661-024-12566-6