Hematology and stress physiology of juvenile diploid and triploid shortnose sturgeon (<Emphasis Type="Italic">Acipenser brevirostrum</Emphasis>) |
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| Authors: | M?M?Beyea Email author" target="_blank">T?J?BenfeyEmail author J?D?Kieffer |
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| Institution: | (1) Department of Biology, University of New Brunswick, P. O. Box 4400, Fredericton, N.B., E3B 5A3, Canada;(2) Department of Biology, University of New Brunswick, P. O. Box 5050, Saint John, N.B., E2L 4L5, Canada |
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| Abstract: | This study examined diploid and triploid shortnose sturgeon hematology and stress physiology through the investigation of
various characteristics and components of whole blood and blood plasma. Erythrocytic cellular and nuclear length and width
were significantly larger in triploids than in diploids. Hematocrit was depressed in triploid sturgeon in comparison to diploids,
but total blood hemoglobin content and mean erythrocytic hemoglobin concentration (MEHC) did not differ between ploidies.
The mean erythrocytic hemoglobin (MEH) was elevated in proportion to the increase in erythrocyte size. Taken together, these
data suggest that triploids and diploids likely have similar oxygen carrying and aerobic capacities. In response to an acute
stressor of 15 min chasing, plasma cortisol and glucose levels did not differ between ploidies. Cortisol levels were significantly
depressed at 2 h post-stress with an increase back to 0 h post-stress levels at 6 h into recovery, whereas glucose levels
did not change during the recovery period. There was a significant interaction between ploidy and time post-stress for blood
hemoglobin concentrations, with diploids demonstrating elevated hemoglobin content at 6 h post-stress. Plasma osmolality,
chloride ion concentrations and lactate levels were elevated in triploids. Overall, it does not appear that sturgeon have
developed an elaborate stress response and the triploid stress response appears to be slightly reduced in comparison to diploids. |
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| Keywords: | cortisol forced exercise hematology lactate osmolality triploidy |
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