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The ontogeny of physiological response to light intensity in early stage spiny lobster (Jasus edwardsii) larvae
Bermudes, M and Ritar, AJ and Carter, CG (2008) The ontogeny of physiological response to light intensity in early stage spiny lobster (Jasus edwardsii) larvae. Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology, 150 (1). pp. 40-45. ISSN 1095-6433
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Early stage phyllosoma larvae of the spiny rock lobster Jasus edwardsii were examined for swimming speed, feeding, oxygen consumption and nitrogen excretion as instantaneous performance indicators when exposed to different irradiance levels. Swimming speed was measured in recently hatched Stage I larvae while all other parameterswere measured in larvae from hatch tomid-Stage V. The swimming speed of recently hatched Stage I phyllosoma increased logarithmically between light intensities of 2.9×1014 and 1.8×1016 quanta s−1 cm−2 indicating that, within this range, swimming activity was only suppressed at the lowest irradiance level. Larvae examined under dark (no light) conditions showed lower feed intake, oxygen consumption and nitrogen excretion than larvae under low (7.7×1012 q s−1 cm−2) and high (3.9×1014 q s−1 cm−2) light intensities, and this was a consistent pattern observed throughout development from hatch to Stage V. There was no difference in feeding, oxygen consumption and nitrogen excretion between larvae exposed to low and high light intensities. However, from mid-Stage I to mid-Stage V, the metabolic feeding efficiency (feed intake:oxygen consumption ratio) was consistently higher in larvae exposed to low light intensity than in phyllosoma assessed in the dark and under high irradiance. A light intensity of about 7.7×1012 quanta s− 1 cm− 2 and no higher than 3.9×1014 quanta s− 1 cm− 2 is recommended to stimulate feeding and optimisemetabolic feeding efficiency in early larval stages of J. edwardsii. © 2008 Elsevier Inc. All rights reserved.
|Keywords:||Light intensity Oxygen consumption Nitrogen excretion Feeding Jasus edwardsii Larvae|
|Journal or Publication Title:||Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology|
|Page Range:||pp. 40-45|
|Identification Number - DOI:||10.1016/j.cbpa.2008.02.023|
|Additional Information:||The definitive version is available at http://www.sciencedirect.com|
|Date Deposited:||05 Jun 2008 06:00|
|Last Modified:||18 Nov 2014 03:42|
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