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New Zealand Journal of Marine and Freshwater Research Volume 47, 2013 - Issue 1
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Articles

Trophic ecology drives spatial variability in growth among subpopulations of an exploited temperate reef fish

NA Beer Department of Marine Science, University of Otago, Dunedin, New ZealandCorrespondence[email protected]
&
SR Wing Department of Marine Science, University of Otago, Dunedin, New Zealand
Pages 73-89 | Received 24 Jun 2012, Accepted 08 Nov 2012, Published online: 20 Feb 2013

Figures & data

Figure 1  Location of study sites in southern Fiordland.

Figure 1  Location of study sites in southern Fiordland.

Figure 2  Mean P. colias stomach contents occurrence at each site of A, Zooplankton, B, Pisces, C, Echinodermata, D, Crustacea, E, Mollusca, F, Benthic invertebrates, G, Algae and H, Detritus. Data have been pooled across sexes and years. Standard error bars are shown. A significant difference (P < 0.05) between paired inner and outer fjord sites is denoted by an asterisk. Dark bars indicate inner fjord sites and light bars indicate outer fjord sites.

Figure 2  Mean P. colias stomach contents occurrence at each site of A, Zooplankton, B, Pisces, C, Echinodermata, D, Crustacea, E, Mollusca, F, Benthic invertebrates, G, Algae and H, Detritus. Data have been pooled across sexes and years. Standard error bars are shown. A significant difference (P < 0.05) between paired inner and outer fjord sites is denoted by an asterisk. Dark bars indicate inner fjord sites and light bars indicate outer fjord sites.

Figure 3  A, Mean Shannon–Wiener diversity (H′) at each site. Data have been pooled across sexes and years. Standard error bars are shown. Dark bars indicate inner fjord sites and light bars indicate outer fjord sites. A significant difference (P<0.05) between paired inner and outer fjord sites is denoted by an asterisk. B, Mean condition at each site. Data have been pooled across sexes and years. Standard error bars are shown. Dark bars indicate inner fjord sites and light bars indicate outer fjord sites. A significant difference (P < 0.05) between paired inner and outer fjord sites is denoted by an asterisk.

Figure 3  A, Mean Shannon–Wiener diversity (H′) at each site. Data have been pooled across sexes and years. Standard error bars are shown. Dark bars indicate inner fjord sites and light bars indicate outer fjord sites. A significant difference (P<0.05) between paired inner and outer fjord sites is denoted by an asterisk. B, Mean condition at each site. Data have been pooled across sexes and years. Standard error bars are shown. Dark bars indicate inner fjord sites and light bars indicate outer fjord sites. A significant difference (P < 0.05) between paired inner and outer fjord sites is denoted by an asterisk.

Figure 4  Sex ratio of Parapercis colias from each study site recorded as % male in the population. Dark bars indicate inner fjord sites and light bars indicate outer fjord sites; total sample size at each site is given. A significant deviation from a 50:50 sex ratio (P<0.05) is denoted by an asterisk; underlined fjord labels indicate a significant difference (P<0.05) in the sex ratio between inner and outer fjord subpopulations.

Figure 4  Sex ratio of Parapercis colias from each study site recorded as % male in the population. Dark bars indicate inner fjord sites and light bars indicate outer fjord sites; total sample size at each site is given. A significant deviation from a 50:50 sex ratio (P<0.05) is denoted by an asterisk; underlined fjord labels indicate a significant difference (P<0.05) in the sex ratio between inner and outer fjord subpopulations.

Table 1  δ13C and δ15N of Parapercis colias muscle tissue from each study site and results of mass balance mixing models estimating carbon contributions from each basal organic matter source pool. Data shown are the 95% confidence interval (mean±standard error).

Figure 5  A, Size distributions of male Parapercis colias in the inner fjords (n=39). B, Size distributions of male Parapercis colias in the outer fjords (n=60). C, Size distributions of female Parapercis colias in the inner fjords (n=94). D, Size distributions of female Parapercis colias in the outer fjords (n=44).

Figure 5  A, Size distributions of male Parapercis colias in the inner fjords (n=39). B, Size distributions of male Parapercis colias in the outer fjords (n=60). C, Size distributions of female Parapercis colias in the inner fjords (n=94). D, Size distributions of female Parapercis colias in the outer fjords (n=44).

Table 2  Von Bertalanffy growth model parameters (L ∞ , k), residual sum of squares (RSS) and degrees of freedom (d.f.) for male and female fish sampled in inner and outer fjord habitats (pooled across years). t 0 was set at 0 for all models.

Table 3  Details of log-likelihood, number of parameters (K), AIC c , delta values, Akaike weights and variance explained (R 2 ) for models explaining variability in size-at-age.

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