The role of hatchling size in generating the intrinsic size-at-age variability of cephalopods: extending the Forsythe Hypothesis
G. T. Pecl A D , M. A. Steer A B and K. E. Hodgson A CA Marine Research Laboratories, Tasmanian Aquaculture & Fisheries Institute, University of Tasmania, Private Bag 49, Hobart, Tas. 7001, Australia.
B School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Private Bag 370, Launceston, Tas. 7250, Australia.
C Institute of Antarctic and Southern Ocean Studies, University of Tasmania, Private Bag 77, Hobart, Tas. 7001, Australia.
D Corresponding author. Email: Gretta.Pecl@utas.edu.au
Marine and Freshwater Research 55(4) 387-394 https://doi.org/10.1071/MF03153
Submitted: 30 September 2003 Accepted: 19 March 2004 Published: 22 June 2004
Abstract
Cephalopods are characterised by extreme variability in size-at-age, with much of this variation attributed to effects of temperature and food. However, even siblings reared under identical conditions display a wide range of sizes after a period of growth. Hatchling size may represent a source of variation encompassed within adult size-at-age data (i) within a given cohort (variation in hatchling size suggests that a cohort’s growth trajectory will have a ‘staggered start’) and (ii) as hatchling size also varies as a function of incubation temperature this will vary across broader scales (i.e. between cohorts). Field-hatchling size data for Sepioteuthis australis were used in simple deterministic simulations, extending Forsythe’s (1993) temperature hypothesis, to investigate the influence of hatchling size on adult size-at-age variability. Within a cohort, our growth projections suggest that after 90 days, a large hatchling growing at a specific constant percentage daily growth rate (%BW day–1), would be approximately double the size of the small hatchling growing at exactly the same rate, irrespective of the growth rate used. When considering growth of different cohorts, decreases in hatchling size, as temperatures increase during a spring/summer spawning season, may be partially counteracting the ‘Forsythe-effect’ of increased growth rate at higher temperatures.
Extra keywords: body size, growth variability, life history, squid, temperature.
Acknowledgments
Many thanks to the participants of the Cephalopod International Advisory Council 2003 workshop and symposia for their discussions on this topic. Thank you also to Toby Patterson for constructive input.
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