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- W2108752857 abstract "Crustacean gills function in gas exchange, ion transport, and immune defense against microbial pathogens. Hemocyte aggregates that form in response to microbial pathogens become trapped in the fine vasculature of the gill, leading to the suggestion by others that respiration and ion regulation might by impaired during the course of an immune response. In the present study, injection of the pathogenic bacterium Vibrio campbellii into Callinectes sapidus, the Atlantic blue crab, caused a dramatic decline in oxygen uptake from 4.53 to 2.56 μmol g−1 h−1. This decline in oxygen uptake is associated with a large decrease in postbranchial Po2, from 16.2 (±0.46 SEM, n=7) to 13.1 kPa (±0.77 SEM, n=9), while prebranchial Po2 remains unchanged. In addition, injection of Vibrio results in the disappearance of a pH change across the gills, an indication of reduced CO2 excretion. The hemolymph hydrostatic pressure change across the gill circulation increases nearly 2-fold in Vibrio-injected crabs compared with a negligible change in pressure across the gill circulation in saline-injected, control crabs. This change, in combination with stability of heart rate and branchial chamber pressure, is indicative of a significant increase in vascular resistance across the gills that is induced by hemocyte nodule formation. A healthy, active blue crab can eliminate most invading bacteria, but the respiratory function of the gills is impaired. Thus, when blue crabs are engaged in the immune response, they are less equipped to engage in oxygen-fueled activities such as predator avoidance, prey capture, and migration. Furthermore, crabs are less fit to invade environments that are hypoxic." @default.
- W2108752857 created "2016-06-24" @default.
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- W2108752857 date "2006-08-01" @default.
- W2108752857 modified "2023-10-02" @default.
- W2108752857 title "Immune Defense Reduces Respiratory Fitness in<i>Callinectes sapidus,</i>the Atlantic Blue Crab" @default.
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- W2108752857 doi "https://doi.org/10.2307/4134577" @default.
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