Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:…orogenic events have contributed to shaping the current diversity and distribution of modern species in both the Neotropical (Bush 1994; Hoorn et al. 1995, 2010; Pennington et al. 2004; Rull 2006, 2008, 2011; Antonelli & Sanmartin 2011) and temperate regions (Ruzzante et al. 2006,…
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