take into account that display structures
such as pennaceous feathers make species
recognizable to other species.
We emphasize that feathers did not
“evolve for” something; rather, their fortuitous appearance was associated with a
selective advantage, which resulted in their
retention. We argue that their original selective advantage was in signaling, not flight.
Markus Lambertz,3 Christian Fischer,2
P. Martin Sander1,4
1Division of Paleontology, Steinmann Institute for
Geology, Mineralogy and Paleontology, Rheinische
Friedrich-Wilhelms-Universität Bonn, 53115 Bonn,
Germany. 2Institute for Zoology and Anthropology,
Department of Morphology, Systematics and
Evolutionary Biology with Zoological Museum,
Georg-August-Universität Göttingen, 37073
Göttingen, Germany. 3Institut für Zoologie,
Rheinische Friedrich-Wilhelms-Universität Bonn,
53115 Bonn, Germany. 4Dinosaur Institute, Natural
History Museum of Los Angeles County, Los
Angeles, CA 90007, USA.
*Corresponding author. E-mail: m.koschowitz@
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Erratum for the Perspective: “
Mathematical models for emerging disease” by
A. Dobson, Science 346, aaa4792 (2014).
Published online 19 December 2014; 10.1126/
Erratum for the Report: “Proton-catalyzed,
silane-fueled Friedel-Crafts coupling of
fluoroarenes” by O. Allemann et al., Science
346, aaa4609 (2014). Published online 12 December 2014; 10.1126/science.aaa4609
Comment on “A 12-million-year
temperature history of the tropical
Ana Christina Ravelo, Kira Trillium Lawrence,
Alexey Fedorov, Heather Louise Ford
Zhang et al. (Reports, 4 April 2014, p. 84)
Full text at http://dx.doi.org/10.1126/
interpret TEX86 and U37 K' paleotemperature
data as providing a fundamentally new
view of tropical Pacific climate during
the warm Pliocene period. We argue
that, within error, their Pliocene data
actually support previously published
data indicating average western warm-
pool temperature similar to today and a
reduced zonal gradient, referred to as a
permanent El Niño–like state.
Response to Comment on “A
12-million-year temperature history of
the tropical Pacific Ocean”
Yi Ge Zhang, Mark Pagani, Zhonghui Liu
Contrary to our conclusions, Ravelo et al.
argue that our TEX86-based sea surface
temperature (SST) records do not conflict
with the supposition of “permanent El
Niño–like” conditions during the early
Pliocene. We show that the way Ravelo
et al. treat the existing temperature data
perpetuates an inaccurate impression of
cooler Pacific warm-pool SSTs and low
equatorial temperature gradients in
Full text at http://dx.doi.org/10.1126/
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