Bioenergetics of early life-history stages of the brachyuran crab Cancer setosus in response to changes in temperature


Fischer, Sönke, Thatje, Sven, Graeve, Martin, Paschke, Kurt and Kattner, Gerhard (2009) Bioenergetics of early life-history stages of the brachyuran crab Cancer setosus in response to changes in temperature. Journal of Experimental Marine Biology and Ecology, 374, 160-166. (doi:10.1016/j.jembe.2009.04.019).

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Description/Abstract

In many marine invertebrates, a latitudinal cline in egg size is considered an adaptive response to a decrease in temperature, and enhances the energetic fitness of their larvae at hatching. However, the amount of energy carried over from the egg to the larval stage depends on the metabolic efficiency of egg development. In the present study, eggs of the brachyuran crab Cancer setosus were sampled for their dry mass (DM), carbon (C), nitrogen (N), and fatty acid (FA) content throughout development from blastula stage until hatching of zoea 1-larvae at Antofagasta (23°S) and Puerto Montt 41°S (Chile) under different temperature treatments (12, 16 and 19 °C). Hatching zoea 1 larvae contained 60 ± 3% of the initial blastula egg C content, regardless of site or temperature. However, the ontogenetic decrease in egg C content was to a significantly higher extend based on the utilization of energy-rich FA at 12 °C (− 1.16 µg/egg) compared to the 19 °C treatments in Antofagasta and Puerto Montt (− 0.63 to − 0.73 µg FA per egg). At 19 °C egg-metabolism was based to a substantial extend on protein, which allowed for the saving of energy-richer lipids. We conclude that the production of larger eggs with high FA content appears to be adaptive not only to fuel the larval development, but is also a response to the prolonged egg developmental times at lower temperatures.

Item Type: Article
ISSNs: 0022-0981 (print)
Related URLs:
Keywords: Chile; Crustacea; Eggs; Elemental analysis; Fatty acids; Larvae
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
ePrint ID: 65665
Date Deposited: 05 Mar 2009
Last Modified: 27 Mar 2014 18:47
URI: http://eprints.soton.ac.uk/id/eprint/65665

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