Regulation of Calcium Transport in the Early Life Stages of an Ancient Fish,Acipenser fulvescens
| Autor: | Janet Genz, W. Gary Anderson, Lauren Shute |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Gills
Male Physiology chemistry.chemical_element Zoology Environment Biology Calcium Biochemistry medicine Animals Acipenser Yolk sac Larva Ion Transport Ecology Fishes biology.organism_classification Early life Mitochondria medicine.anatomical_structure Intestinal Absorption chemistry Microscopy Electron Scanning Fish Female Animal Science and Zoology Lake sturgeon |
| Zdroj: | Physiological and Biochemical Zoology. 87:299-309 |
| ISSN: | 1537-5293 1522-2152 |
| DOI: | 10.1086/674919 |
| Popis: | The freshwater, cartilaginous lake sturgeon (Acipenser fulvescens) encounters its greatest calcium (Ca(2+)) demand in the early life stages. In this study we examined Ca(2+) regulation of lake sturgeon larvae reared at three levels of environmental [Ca(2+)]-0.1, 0.2, and 1.5 mmol L(-1)-from hatch until after the transition to exogenous feeding. Examination of skin, gill, and yolk sac with scanning electron microscopy (SEM) indicated that the density and surface area of mitochondria-rich cells (MRCs) varies over developmental time but that availability of environmental Ca(2+) affected only MRC density. SEM results also demonstrated that Ca(2+) transport is adjusted in localization over the course of development, with the transition to primarily branchial uptake occurring earlier in the highest environmental [Ca(2+)]. Net whole-animal Ca(2+) flux was primarily dependent on influx rate. The increase in whole-body Ca(2+) uptake following the transition to exogenous feeding was greatest in larval lake sturgeon acclimated to low environmental [Ca(2+)], and it suggests that intestinal absorption may supplement enhanced branchial uptake in Ca(2+)-limited fish. |
| Databáze: | OpenAIRE |
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