Table 3.
Spearman's rank correlation tests between proxies for interspecific encounters (maximum number of volant seabirds recorded and residency index) and two explanatory variables: total number of prey caught by African penguins in a dive bout (AP catch) and maximum number of African penguins recorded in a dive bout (max. AP). Correlation coefficients (rs) and p-values (significant values at 5%, in italics) are given.
| response |
explanatory |
||||||
|---|---|---|---|---|---|---|---|
| AP catch |
max. AP |
||||||
| group | variable | median (range) | N dive bouts | rs | p | rs | p |
| Procellariidae | max. number | 3 (1–25) | 31 | −0.002 | 0.9 | 0.35 | 0.05 |
| residency index | 0.3 (0–0.75) | −0.2 | 0.4 | 0.19 | 0.3 | ||
| Cape cormorants | max. number | 4 (1–20) | 26 | −0.22 | 0.3 | 0.19 | 0.4 |
| residency index | 0.2 (0–0.8) | −0.3 | 0.1 | 0.16 | 0.5 | ||
| Terns | max. number | 6 (1–40) | 15 | 0.04 | 0.9 | 0.63 | 0.01 |
| residency index | 0.3 (0.05–1) | 0.08 | 0.8 | 0.13 | 0.6 | ||