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The role of temperature and maternal ration: using Euprymna tasmanica as a model.

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Steer, MA and Moltschaniwskyj, NA and Nichols, DS and Miller, MR (2004) The role of temperature and maternal ration: using Euprymna tasmanica as a model. Journal of Experimental Marine Biology and Ecology, 307 (1). pp. 73-89. ISSN 0022-0981

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Abstract

Using a ‘model’ sepiolid, Euprymna tasmanica, this study investigated the role of maternal
nutritional and thermal history on egg quality and subsequent embryo survival. E. tasmanica is a
multiple spawner, therefore it was possible to track egg quality and hatching success over
successive spawning episodes. A two-factor orthogonal experimental design, involving two
feeding levels (high and low rations) and two temperatures (summer and winter), was
implemented with half of the replicates used to explore embryonic development and the
remaining half examining egg-yolk quality via fatty acid analysis. Differences in reproductive
output and embryo mortality were largely attributed to maternal ration and not temperature.
Females maintained on low ration produced smaller clutches, consisting of smaller eggs and
exhibiting higher embryo mortality rates than high ration females. Both batch fecundity and
relative hatching success declined over successive clutches. Lipid content was also significantly
lower in low ration females, however, the relative quality in terms of lipid and fatty acid
constituents was maintained regardless of treatment and spawning frequency. It is suggested that
elevated embryo mortality rate in eggs spawned by low-fed females was a function of
insufficient maternally derived yolk resources to fuel embryogenesis. Results indicate that
maternal nutritional and reproductive history are important determinates for offspring survival,potentially having significant effects on the magnitude of subsequent recruitment events in squid
populations.

Item Type: Article
Keywords: Embryo mortality; Maternal effects; Multiple spawner; Euprymna tasmanica
Journal or Publication Title: Journal of Experimental Marine Biology and Ecology
Page Range: pp. 73-89
ISSN: 0022-0981
Identification Number - DOI: 10.1016/j.jembe.2004.01.017
Additional Information:

The definitive version is available at http://www.sciencedirect.com

Date Deposited: 14 Jul 2010 05:10
Last Modified: 18 Nov 2014 04:11
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