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Vol. 51 No. 5, 2012
Temperature Effects on the Egg Development Time and Hatching Success of Three Acartia Species (Copepoda: Calanoida) from the Strait of Malacca
Teruaki Yoshida1,*, Ching-Fong Liong1, Abdul Mohamed Majid2, Tatsuki Toda3, and Bin Haji Ross Othman1
1Marine
Ecosystem Research Centre, Faculty of Science and Technology,
Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
2Biology
Section, Centre for Foundation Studies in Science, Marine Ecosystem
Research Centre, Faculty of Science and Technology, Universiti Malaya,
Kuala Lumpur 50000, Malaysia. E-mail:ammajid@um.edu.my
3Laboratory of Restoration Ecology, Department of
Environmental Engineering for Symbiosis, Faculty of Engineering, Soka
University, 1-236, Tangi-cho, Hachioji, Tokyo 192-8577, Japan.
E-mail:toda@t.soka.ac.jp
Teruaki Yoshida, Ching-Fong Liong, Abdul Mohamed Majid, Tatsuki Toda, and Bin Haji Ross Othman (2012) Development
times and hatching success rates at 6 temperatures (10, 14, 18, 22, 27,
and 31°C) are presented for eggs of 3 congeneric Acartiid copepods, Acartia spinicauda, A. erythraea, and A. pacifica,
from the Strait of Malacca, Malaysia. Egg development times of
the 3 species were significantly related to the incubation temperature
and each fit Bělehrádek’s function. Hatching success at 10°C was
the lowest (13%) and significantly differed from those at other
temperatures (by an ANOVA). Average hatching success rates at
14-31°C were 61% ± 26%, 78% ± 8%, and 87% ± 8% for A. erythraea, A. pacifica, and A. spinicauda, respectively. The temperature functions for egg development times of A. erythraea, A. pacifica, and A. spinicauda were D = 294(T - 4.47)-2.05, D = 545(T - 1.94)-2.05, and D = 352(T - 4.30)-2.05,
respectively. Values of the ‘biological zero’ for Acartia were
significantly correlated with environmental temperatures, suggesting
that differences in temperature adaptation of development rates of eggs
can be described from a single parameter of the temperature
response. The results observed in this study were compared to
findings from previous studies performed on other Acartiid species and
from other copepod genera.
Key words: Acartia, Egg, Biological zero, Tropical coastal waters.
*Correspondence: Tel: 603-89215874. Fax: 603-89213011. E-mail:teruaki.yoshida@gmail.com
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