Kyle Siler et al. have self-archived "The Diverse Niches of Megajournals: Specialism within Generalism."
Here's an excerpt:
We analyze how megajournals (PLOS ONE, Scientific Reports) are represented in different fields relative to prominent generalist journals (Nature, PNAS, Science) and 'quasi-megajournals' (Nature Communications, PeerJ). Our results show that both megajournals and prominent traditional journals have distinctive niches, despite the similar interdisciplinary scopes of such journals. These niches—defined by publishing volume and disciplinary diversity—are dynamic and varied over the relatively brief histories of the analyzed megajournals. Although the life sciences are the predominant contributor to megajournals, there is variation in the disciplinary composition of different megajournals.
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