1985, Hugh A. Ford, David C. Paton, Chapter 12: Habitat Selection in Australian Honeyeaters, with Special Reference to Nectar Productivity, Martin L. Cody (editor), Habitat Selection in Birds, 376, For all honeyeaters combined and White-naped Honeyeaters, the only other common species, there is actually a negative correlation between abundance and nectar productivity […] .
Source: wiktionary