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Modelling seasonal catchability of the southern rock lobster Jasus edwardsii by water temperature, moulting, and mating


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Ziegler, PE, Haddon, M, Frusher, SD and Johnson, CR 2004 , 'Modelling seasonal catchability of the southern rock lobster Jasus edwardsii by water temperature, moulting, and mating' , Marine Biology, vol. 145, no. 1 , pp. 179-190 , doi: 10.1007/s00227-004-1298-6.

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Seasonal variation in catchability of legal-sized
male and female southern rock lobster Jasus edwardsii in
a scientific reserve in south-east Tasmania, Australia,
over a 15-month period was described by modelling the
effects of water temperature, moulting and mating.
Seasonal changes in water temperature described 62% of
the variation of catchability for males, but were a poor
predictor of catchability for females outside winter. Both
moulting and mating was highly synchronised, although
males and females moulted at different times of the year.
This had a significant sex-specific effect on catchability,
because the models developed here indicate that feeding
and therefore catchability is decreased during moulting
and mating and followed by an increased food consumption
to compensate for the lack of feeding during
these periods. Gaussian probability density functions
were used to represent the timing and intensity of moulting,
mating and subsequent compensation periods,
and were combined with the description of seasonal
temperature changes. Four Gaussian functions in
agreement with independent biological data considerably
improved the model fits for the catchability of
males (R2=0.84). Adding a single Gaussian function to
the temperature model, representing a combined moulting
and mating period, provided a good fit to the
variation in catchability of females (R2=0.90). However,
the biological relevance of this model remained
unclear during a second period of moulting and mating
where empirical observations were missing.

Item Type: Article
Authors/Creators:Ziegler, PE and Haddon, M and Frusher, SD and Johnson, CR
Keywords: Jasus edwardsii, southern rock lobster
Journal or Publication Title: Marine Biology
DOI / ID Number: 10.1007/s00227-004-1298-6
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