ISOTOPIC RECORDS FROM EARLY WHALES AND SEA COWS: CONTRASTING PATTERNS OF ECOLOGICAL TRANSITION

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Using stable isotope biogeochemistry to study marine mammal ecology (2010, background): “However, relatively high 13C and 18O values from another extinct clade, the Eocene-aged Protosirenidae, indicate that these fully aquatic mammals inhabited marine ecosystems, where they foraged in sea grass beds (MacFadden et al. 2004, Clementz et al. 2006) (Fig.”
From Land to Water: the Origin of Whales, Dolphins, and Porpoises (2009, background): “Just like Indohyus, limb bones of pakicetids are osteosclerotic (Madar 2007), also suggestive of aquatic habitat, an interpretation consistent with stable isotope evidence (Roe et al. 1998; Clementz et al. 2006).”
Identifying Aquatic Habits Of Herbivorous Mammals Through Stable Isotope Analysis (2008, background): “While low population-level variation in 8I80 values is an excel lent measure of aquatic habits in marine species (Clementz et al., 2003; Clementz et al., 2006), greater care must be taken when dealing with fossil specimens from fresh-water deposits where the effects of time av”