Free Content The Larval Stages of Some Australian Species of Halicarcinus (Crustacea, Brachyura, Hymenosomatidae). II. Physiology

 Download
(PDF 2,279.8 kb)
 
Download Article:

Abstract:

Five species of Halicarcinus were reared through complete larval development in the laboratory; of these, two species were tested in all combinations of four salinities and four temperatures. Upper temperature tolerance and tolerance of abrupt changes in salinity were also investigated.

Larvae of estuarine species, H. australis and H. paralacustris, complete their development over salinity ranges of 11.5‰-34.0‰ and 2.0‰-34.2‰, respectively, and temperature ranges of 13.1°-25.0°C and 13.0°-30.2°C, respectively. For each species there is a distinct region of optimum salinity-temperature conditions with 90-100 per cent survival. Salinity, temperature, and a salinity-temperature interaction strongly affect survival and duration of larval development and Q10 values for rate of development are generally 2-3 in the range of highest survival. Temperature effects on larvae are influenced by the embryonic temperature regime.

Larvae of H. australis and H. paralacustris are more euryhaline and eurythermal than larvae of the marine H. ovatus, and they have shorter periods of development than those of H. ovatus and another marine species, H. rostratus, at similar temperatures. These differences are an adaptive advantage for estuarine habitation. Decreased surface-to-volume ratio and prolongation of the period of probable protection from osmosis, within the egg membrane, are physiological advantages of the absence of free larval stages in the freshwater species, H. lacustris.

Document Type: Research Article

Publication date: December 1, 1972

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more