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Life history of a short-lived squid (Sepioteuthis australis): resource allocation as a function size, growth, maturation, and hatching season

Citation

Pecl, GT and Moltschaniwskyj, NA, Life history of a short-lived squid (Sepioteuthis australis): resource allocation as a function size, growth, maturation, and hatching season, ICES Journal of Marine Science, 63, (6) pp. 995-1004. ISSN 1054-3139 (2006) [Refereed Article]

DOI: doi:10.1016/j.icesjms.2006.04.007

Abstract

Many cephalopods continue growing while laying multiple egg batches over the adult life, with repro-somatic allocation continuing beyond attainment of reproductive maturity. Many species show extreme individual variation in reproductive investment. Factors driving this variation in adult Sepioteuthis australis were evaluated by examining allocation of energy to somatic and reproductive growth as a function of body shape, growth rate, maturation, and hatching season. Hatching season influence was sex-specific; males hatched in warmer months had greater reproductive investment, faster growth, and better somatic and reproductive condition, whereas females hatched in spring and summer had less reproductive investment. Seasonal impacts on life history resulted in an "alternation of generations", with slow-growing squid in poor condition and with high levels of reproductive investment producing a generation with completely different life-history characteristics. This suggests that abiotic and biotic conditions that change seasonally could play a large role in determining energy allocated to reproduction. However, this was not driving trade-offs between size and number of offspring. Life-history trade-offs should be detectable as negative correlations between relevant traits. However, in Sepioteuthis australis there was little evidence of trade-offs between reproduction and growth or condition of individuals, suggesting a "live for today" lifestyle. © 2006 International Council for the Exploration of the Sea.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Pecl, GT (Associate Professor Gretta Pecl)
Author:Moltschaniwskyj, NA (Associate Professor Natalie Moltschaniwskyj)
ID Code:42075
Year Published:2006
Web of Science® Times Cited:9
Deposited By:TAFI - Aquaculture
Deposited On:2006-08-01
Last Modified:2009-04-06
Downloads:0

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