The value of evidence about past abundance: marine fauna of the Gulf of California through the eyes of 16th to 19th century travellers

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The ‘shifting baseline’ phenomenon: a global perspective (2008, background): “Several authors (notably Jackson et al. 2001; Saénz-Arroyo et al. 2006; Dalzell 1998) have called for a wider appreciation of such data.”
Extinction of a shark population in the Archipelago of Saint Paul's Rocks (equatorial Atlantic) inferred from the historical record (2011, background): “The occurrence of such large numbers of sharks around oceanic islands is not an uncommon feature in the reports of the 18th and 19th century’s ocean explorers (Sáenz-Arroyo et al., 2006; Roberts, 2007; see Supplemental data in Sandin et al. (2008) and Ward-Paige et al. (2010)).”
Biodiversity and extinction (2007, unknown): “The scale of many of these declines has only recently become apparent, through the careful examination of the accounts of early travellers (eg, Saenz-Arroyo et al., 2006).”
Evidence for shifting baseline syndrome in conservation (2009, background): “Evidence from diaries of early explorers has been examined by Sáenz-Arroyo et al. (2006), suggesting greater past densities of sea life in the Gulf of California.”