New Zealand Journal of Marine and Freshwater Research abstracts
Mortality of post-settlement abalone Haliotis iris caused by conspecific
adults and wave exposure
J. REYN NAYLOR
National Institute of Water & Atmospheric
Research Ltd
P. O. Box 14 901, Kilbirnie
Wellington, New Zealand
email: r.naylor@niwa.cri.nz
PAUL E. MCSHANE
Faculty of Fisheries and Marine Environment
Australian Maritime College
P. O. Box 21, Beaconsfield
Tas 7270, Australia
Abstract Experimental studies of post-settlement abalone
(
Haliotis iris Martyn) indicate that wave exposure and conspecific
adults may be important sources of mortality. In aquarium studies, exposure of
post-settlement abalone to grazing by sea urchins (
Evechinus
chloroticus) and starfish (
Patiriella regularis), animals common in
the subtidal habitat of
H. iris,
resulted in similar survival to
control treatments (no grazers).
However, in the presence of conspecific
adults, the survival of post-settlement juveniles was approximately half that
of control treatments.
The major cause of mortality was evidently pedal
smothering by adults.
Similar results were obtained in field studies in
which survival of recently settled abalone was greater in the absence of
conspecific adults.
Field studies also revealed that the differences
between two bays exposed to contrasting wave action were a significant source
of variation in post-settlement mortality. Survival of recruits was greater in
the sheltered bay compared with the bay exposed to ocean swells.
Keywords abalone; dislodgement; exposure; Haliotis
iris; mortality
M00032
Received 21 June 2000; accepted 31 October 2000
New Zealand Journal of Marine and Freshwater Research, 2001, Vol. 35:
363-369
0028-8330/01/3502 -0363 $7.00 (c) The Royal Society of New Zealand
2001
PDF file of entire paper: medium quality (581K); (scanned from paper original: notes about this process)
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