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Hematological responses to thermal acclimation in a cold water squaliform (Heterodontus francisci girard)

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Summary

The hematological modifications occurring as a result of acclimation to increased temperature in the cold water horn shark,Heterodontus francisci, were evaluated. Sharks were maintained under constant conditions except for temperature (15°C and 25°C) in a closed marine system. The total red blood cell (RBC) number decreased in the 25°C sharks. In contrast, hemoglobin concentration, hematocrit, mean corpuscular volume (MCV) and mean corpuscular hemoglobin (MCH) significantly increased at 25°C compared to the control animals. RBC size was increased at 25°C, but the surface area/mm3 whole blood was reduced. Folic acid levels were not different between the groups. Vitamin B12 levels decreased and testosterone increased at 25°C. Blood pH, number of erythroblasts, number of white blood cells (WBC) and WBC differential analyses were essentially unchanged at the two temperatures, except that the relative neutrophil number was increased. The major hematological changes occur in the erythrocytes and appear to be sequential in nature with an initial loss of RBC followed by increased hemoglobin synthesis and increased RBC size, but lack of recovery of RBC numbers.

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Abbreviations

Hb:

hemoglobin

Hct:

hematocrit

MCH(C):

mean corpuscular hemoglobin (concentration)

MCV:

mean corpuscular volume

RBC:

red blood cells

WBC:

white blood cells

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Authors and Affiliations

  1. Department of Biology, Wayne State University, 48202, Detroit, Michigan, USA

    Nancy L. Neale, Kenneth V. Honn & Walter Chavin

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  1. Nancy L. Neale
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  2. Kenneth V. Honn
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  3. Walter Chavin
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Contribution Number 359, Department of Biology

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Neale, N.L., Honn, K.V. & Chavin, W. Hematological responses to thermal acclimation in a cold water squaliform (Heterodontus francisci girard). J Comp Physiol B 115, 215–222 (1977). https://doi.org/10.1007/BF00692532

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  • DOI: https://doi.org/10.1007/BF00692532

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