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Physiological responses of postlarval and juvenile blue crabs Callinectes sapidus to hypoxia and anoxia
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tankersley, Richard A. Wieber, Maria G. |
| Copyright Year | 2000 |
| Abstract | The influence of hypoxia and anoxia on the oxygen consumption, survivorship and rate of metamorphosis of field-caught postlarvae (megalopae) and first-instar juveniles of the blue crab Callinectes sapidus was observed under laboratory conditions. Rates of oxygen uptake by megalopae were independent of P O2 at oxygen tensions above 8.88 kPa. However, P O for juvenile crabs was significantly higher than for megalopae (89.6 vs 43.2% saturation). Tolerance of blue crab megalopae of hypoxic conditions below 20% saturation (-4.12 kPa) was greater than for newly metamorphosed juveniles. Juvenile crabs also succumbed to the effects of anoxia more rapidly than megalopae, but neither group survived exposure of >5 h. Megalopae and crabs that became immobile in anoxic water quickly recovered when returned to normoxic conditions. Metamorphosis of megalopae to the first-juvenile stage was delayed when they were exposed to P O2 values of 8.21 and 12.32 kPa (40 and 60 % saturation). Similarly, time to metamorphosis increased significantly when megalopae were temporarily exposed to hypoxic conditions (P O2 = 4.12 kPa) for 4 h each day. However, there was no significant difference between the time to metamorphosis for megalopae exposed to hypoxic conditions for 2 h each day and those maintained in oxygen-saturated water. These results suggest that the presence of hypoxic and anoxic water in deep water layers and shallow near-shore habitats of estuaries during the summer months may influence the onshore migration, settlement and survival of blue crab megalopae and newly metamorphosed juvenile crabs. |
| Starting Page | 179 |
| Ending Page | 191 |
| Page Count | 13 |
| File Format | PDF HTM / HTML |
| DOI | 10.3354/meps194179 |
| Volume Number | 194 |
| Alternate Webpage(s) | https://www.int-res.com/articles/meps/194/m194p179.pdf |
| Alternate Webpage(s) | https://doi.org/10.3354/meps194179 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
