ISSN:
1573-5117
Keywords:
tropical zooplankton
;
crustacean larvae
;
Palaemon pandaliformis
;
Palaemon northropi
;
respiratory metabolism
;
palaemonid shrimp
;
survival
;
salinity
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The effect of salinity variation (0, 7, 14, 21, 28 and 35‰S) on survival, moulting and respiratory metabolism of the early zoeal stages of the shrimps Palaemon pandaliformis and P. northropi from the northern coast of the State of São Paulo, Brazil is investigated. Freshly hatched larvae were maintained at 20 °C, in each salinity for a maximum of seven days. Oxygen consumption measurements were made at 20 °C for each salinity using Cartesian diver microrespirometers. In 0‰S, all P. northropi zoeae died after 24 h while 24% of the P. pandaliformis zoeae survived until 4 days. Zoeae of both species survived poorly in 7‰S, the best survival for the two species (90%) being registered in 28%.S. Palaemon northropi zoeae did not survive 35‰S while 45% survival was recorded for P. pandaliformis zoeae in this medium after seven days. Moulting did not occur in zoeae of either species in 0%.S, nor in P. northropi in 7‰S. The metabolism-salinity curve for P. pandaliformis zoea I is very stable over the range 0–21‰S while that for P. northropi exhibits complete salinity independence from 21–35‰ S. Thus, while the early zoeal stages, at least, are conspecific, both developing in the same environment as part of the coastal zooplankton community, they clearly maintain distinct physiological characteristics. The data presented possibly reflect genetic adaptations to the adult biotope already manifested in the first zoeae.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00026605
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