Comparisons of the most abundant carnivorans, C. dirus and S.
fatalis, through time suggest that body size changes may correlate
with climatic fluctuations [47–50]. In contrast, other work by
Prothero and authors [51] suggests stasis in both birds and
mammals through time at La Brea. While temporal comparisons
of body size data are equivocal, temporal comparisons of tooth
breakage data from older (pit 3, ,18,593+/25,541 Ka) [7] to
younger (pits 61/67, ,11,581+/23,768 Ka) [7] deposits yield
minor but significant differences in incidence of tooth breakage
over time in both S. fatalis and C. dirus [12]. Similarly, we observe
minor differences in DMTA attributes over time with significantly
lower anisotropy in S. fatalis occurring during the most recent
deposit (pit 67) in contrast to the older deposits (pit 3 and pit 91,
approximate age of pit 91 is 29,068+/21 SD of 4,571; Tables 3
and 4) [7]. This might reflect a decline in consumption of
excessively tough tissues, though a lack of higher complexity
implies no greater consumption of bone (given caveats for small
sample sizes). Temporal comparisons of P. atrox suggest that degree
of carcass utilization declined over time, as complexity declined
while anisotropy increased (Tables 3 and 4). Small samples sizes
from each temporal pit and temporally mixed pits [7,52–53] may
both contribute to minimal differences in dental microwear
textures. Nevertheless, temporal comparisons of P. atrox suggest
lower carcass utilization during more recent times and are
inconsistent with the idea that times got tougher during the late
Pleistocene at La Brea.
Comparisons of the most abundant carnivorans, C. dirus and S.fatalis, through time suggest that body size changes may correlatewith climatic fluctuations [47–50]. In contrast, other work byProthero and authors [51] suggests stasis in both birds andmammals through time at La Brea. While temporal comparisonsof body size data are equivocal, temporal comparisons of toothbreakage data from older (pit 3, ,18,593+/25,541 Ka) [7] toyounger (pits 61/67, ,11,581+/23,768 Ka) [7] deposits yieldminor but significant differences in incidence of tooth breakageover time in both S. fatalis and C. dirus [12]. Similarly, we observeminor differences in DMTA attributes over time with significantlylower anisotropy in S. fatalis occurring during the most recentdeposit (pit 67) in contrast to the older deposits (pit 3 and pit 91,approximate age of pit 91 is 29,068+/21 SD of 4,571; Tables 3and 4) [7]. This might reflect a decline in consumption ofexcessively tough tissues, though a lack of higher complexityimplies no greater consumption of bone (given caveats for smallsample sizes). Temporal comparisons of P. atrox suggest that degreeof carcass utilization declined over time, as complexity declinedwhile anisotropy increased (Tables 3 and 4). Small samples sizesfrom each temporal pit and temporally mixed pits [7,52–53] mayboth contribute to minimal differences in dental microweartextures. Nevertheless, temporal comparisons of P. atrox suggestlower carcass utilization during more recent times and areinconsistent with the idea that times got tougher during the latePleistocene at La Brea.
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