Seasonal changes of circulating blood parameters in the grass snake Natrix natrix natrix L. |
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| Institution: | 1. Illinois Natural History Survey, 1816 S Oak Street, Champaign, IL 61820, United States;2. Department of Chemistry, McNeese State University, Box 90455, Lake Charles, LA 70609, United States;1. Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, Caixa Postal 15.053, 91501-970 Porto Alegre, RS, Brazil;2. Fundação Estadual de Pesquisa Agropecuária (FEPAGRO), Rua Gonçalves Dias 570, 90130-060 Porto Alegre, RS, Brazil;3. Centro Universitário UNIVATES, Rua Avelino Tallini 171, 95900-000 Lajeado, RS, Brazil;1. Vice Chairman (P&R), TB Association of India, India;2. Executive Editor, Indian Journal of Tuberculosis, India;1. Director, New Delhi Tuberculosis Centre, New Delhi, India;2. Associate Executive Editor, Indian Journal of Tuberculosis, India;1. CIEM MS Research Center, Federal University of Minas Gerais Medical School, Rua Padre Rolim 769, Conj. 1301, Belo Horizonte, MG 30130-090, Brazil;2. Federal University of Minas Gerais Medical School, Belo Horizonte, MG, Brazil;1. Department of Sociology, Duke University, Durham, NC;2. King Abdulaziz University, Jeddah, Makkah, Saudi Arabia;3. School of Labor & Employment Relations, University of Illinois at Urbana Champaign, Champaign, IL;1. COMUE Université Bretagne Loire, Oniris, Nantes-Atlantic College of Veterinary Medicine and Food Sciences, Nantes, France;2. Department of Animal Biology, School of Integrative Biology, University of Illinois at Urbana-Champaign, Urbana, IL, U.S.A.;3. Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, U.S.A.;4. Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, IL, U.S.A.;5. Program in Ecology, Evolution and Conservation, University of Illinois at Urbana-Champaign, Urbana, IL, U.S.A. |
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| Abstract: | - 1.1. Seasonal changes of circulating blood parameters of Natrix n. natrix were evident and involved both sexes to the same extent.
- 2.2. A significant decrease in red cell count, haematocrit and haemaglobin concentration in the mating period, and an increase in those parameters and mean cell volume in autumn were observed, and haemodilution during winter torpor.
- 3.3. The changes during the breeding season had probably a hormonal background; in winter, they resulted first of all from a decreased erythropoietic activity and, to a lesser extent, from an increased red blood cell breakdown rate. However, the possibility that some erythrocytes were withdrawn from the circulation cannot be excluded.
- 4.4. Winter lymphocytopenia, eosinocytopenia and neutrophilic granulocytosis in females during egg laying were expressions of changes of leucocyte formula.
- 5.5. Seasonal cyclicity was found only with respect to the white cell count in males and the eosinophile fraction in males and females.
- 6.6. Probable reasons for, and mechanisms of the changes in blood composition are discussed.
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