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Sepioteuthis Australis Paper
#1
TI: Title

Are bigger calamary Sepioteuthis australis hatchlings more likely

to survive? A study based on statolith dimensions

AU: Author

Steer, MA; Pecl, GT; Moltschaniwskyj, NA

SO: Source

Marine ecology progress series [Mar. Ecol. Prog. Ser.]. Vol. 261,

pp. 175-182. 2003.

AB: Abstract

To determine whether any size-selective processes were operating

throughout the life history of squid, this study set out to

ascertain whether bigger hatchlings are more likely to survive to

adulthood. This was achieved by comparing natal statolith

dimensions between recently hatched (< 13 h old) and successfully

recruited adult Sepioteuthis australis. The squid statolith

(analogous to the teleost otolith) retains a check associated with

hatching, and the natal radius (NR) at hatching had a strong

linear relationship to dorsal mantle length (ML). Hatchlings were

collected using emergent traps from October 2001 to February 2002

on natural spawning grounds located on the east coast of Tasmania.

Hatchling size was extremely variable ranging from 4.3 to 7.3 mm

(ML), with significantly larger squids hatching out in November

and the smallest in February. From February to August, adults were

collected from the same bay and aged using validated daily rings

in the statolith and those adults estimated to have been born

between October and February were included in the analysis. In all

but 1 mo, a significant difference between the NR size

distributions of the hatchlings and adults was detected due to low

numbers of adults with small NRs. This indicated that smaller

hatchlings were less likely to recruit, suggesting that there is

an element of size-mediated mortality operating on populations of

S. australis.





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Glossary/Definitions



statolith - 1. zoology granules within a statocyst: any of the tiny bony granules that are suspended in fluid within a statocyst and whose movement is detected by sensory hairs that determine an invertebrate’s position.

(Also called otolith)



statocyst - invertebrate sensory organ: a fluid-filled organ of balance in some invertebrates such as the lobster containing suspended bony granules that, along with sensory cells, help it to determine its position.

(Also called otocyst)
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