Figure 7
Scheme for classification of nests of brown boobies Sula leucogaster breeding in a heterogeneous landscape in the Saint Peter and Saint Paul Archipelago, Brazil, based on the 304 active and non-active nests sampled. A threshold of 15 m a.s.l. was established, so that nests >15 m are protected from waves, even during storms. Peripheral nests were regarded as such when placed within a 3 m-range from the outer limit of the colony. Position in relation to neighbours and between-nest distance were defined by comparing altitude and distance, respectively, of each nest according the three nearest nests. The average between-nest distance for nests <15 m was 1.2 m.
