Table 3.
Co‐occurrence of two cod types (“fjord” and “North Sea”) at large and small sampling scales. The table shows the type diversity (i.e., probability of two random individuals being of different types) and proportions of samples with both cod types presents. Four different sample levels are depicted: total coastline, geographic region (groups of proximate sample stations: blue circles in Figure 1), beach seine station and individual beach seine haul (i.e., station and year: only one haul was taken from each station each year)
| Level (number of samples) | Cod type diversitya (SD) | Proportion of both typesb |
|---|---|---|
| Total (1) | 0.450 | 1.0 |
| Region (15) | 0.380 (0.121) | 1.0 |
| Station (125) | 0.347 (0.148) | 0.941 |
| Haul (455) | 0.292 (0.175) | 0.813 |
Simpson's index of diversity (Simpson, 1949). Calculated as 1—freq.NS2—(1‐freq.NS)2, and averaged over samples (weighted by sample size). SD is the (weighted) standard deviation.
Excluding samples with <6 individuals (excludes 23 of 125 stations and 188 of 455 hauls).