Influence of salinity and temperature on the larval development of the crown crab, Hymenosoma orbiculare (Crustacea: Brachyura: Hymenosomatidae)

I Papadopoulos; B K Newman; David S Schoeman; T H Wooldridge

doi:10.2989/16085910609503870

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Influence of salinity and temperature on the larval development of the crown crab, Hymenosoma orbiculare (Crustacea: Brachyura: Hymenosomatidae)

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Influence of salinity and temperature on the larval development of the crown crab, Hymenosoma orbiculare (Crustacea: Brachyura: Hymenosomatidae)

I Papadopoulos, B K Newman, David S Schoeman and T H Wooldridge

African Journal of Aquatic Science, Vol.31(1), pp.43-52

2006

DOI: https://doi.org/10.2989/16085910609503870

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Abstract

Earth Sciences

Biological Sciences

survival

life cycles

larvae

development rates

estuaries

zoea

Although the crab Hymenosoma orbiculare appears to complete its entire life cycle within estuaries, the salinity and temperature requirements for its successful larval development are not known. The present study therefore evaluated larval response to salinity and temperature in combination. Larvae were reared individually in factorial combinations of salinity (14, 21, 28, 42 and 49 ppt) and temperature (12, 16, 20, 24, 28 and 32°C). Both parameters influenced the probability of survival for any individual larva. Highest survival occurred at salinities of between 21–35ppt for the Zoea 1 and 2 and of between 28–35ppt for the Zoea 3, with optimum temperature ranges narrowing substantially from Zoea 1 through Zoea 2 to Zoea 3. Temperature exerted a similar influence on development rate at all rearing salinities within each zoeal stage. However, elevated salinity (42 ppt) delayed development. H. orbiculare larvae appear to be well adapted to tolerate salinities typical of the estuarine environment, but the range of salinities tolerated is narrower than expected, considering that the larvae have been recorded at salinities as low as 1ppt in the estuarine environment, and in freshwater in Lake Sibaya, a relict estuarine lake.

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Title: Influence of salinity and temperature on the larval development of the crown crab, Hymenosoma orbiculare (Crustacea: Brachyura: Hymenosomatidae)
Authors: I Papadopoulos (Author) - Nelson Mandela Metropolitan University, South Africa
B K Newman (Author) - University of Zululand, South Africa
David S Schoeman (Author) - Nelson Mandela Metropolitan University, South Africa
T H Wooldridge (Author) - Nelson Mandela Metropolitan University, South Africa
Publication details: African Journal of Aquatic Science, Vol.31(1), pp.43-52
Publisher: National Inquiry Services Centre
Date published: 2006
DOI: 10.2989/16085910609503870
ISSN: 1608-5914
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland; School of Science, Technology and Engineering
Language: English
Record Identifier: 99450394702621
Output Type: Journal article

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