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Re: Evidence for gregarious behavior and age segregation in sauropod dinosaurs


We have similar ichnological evidences here in Portugal:

Lockley, M. G., Meyer, C. A. & Santos, V. F. 1994c. Trackway evidence for a herd of juvenile sauropods from the Late Jurassic of Portugal. Gaia: Revista de Geociencias, Museu Nacional de Historia Natural (Lisbon) 10, 27-36.



Luis Azevedo Rodrigues
Paleontologist/Science communicator/Teacher
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Ciencia Ao Natural
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----- Original Message ----- From: <jigruiz@unizar.es>
To: <dinosaur@usc.edu>
Sent: Friday, March 06, 2009 2:42 PM
Subject: Evidence for gregarious behavior and age segregation in sauropoddinosaurs

Timothy S. Myers & Anthony R. Fiorillo. 2009. Evidence for gregarious behavior and age segregation in sauropod dinosaurs. Palaeogeography, Palaeoclimatology, Palaeoecology 274, 96-104


Both body fossil and ichnofossil evidence for gregarious behavior in
sauropod dinosaurs is examined. Some localities suggest that herds
were partitioned on the basis of age, whereas other sites reveal
groups consisting of both adult and juvenile/subadult individuals. Two
skeletal accumulations showing evidence of age segregation are
examined in detail. The Mother's Day Quarry in the Upper Jurassic
Morrison Formation of Montana contains the remains of several immature
diplodocoid sauropods. An assemblage in the Upper Cretaceous Javelina
Formation of Big Bend National Park in Texas consists entirely of
juvenile Alamosaurus. Both the Mother's Day and Big Bend assemblages
are interpreted here as remnants of age-segregated herds. The
differences between skeletal accumulations composed entirely of
immature animals and mixed-age ichnological assemblages imply that
herd composition was variable. When age segregation is recognized, in
both fossil and modern taxa, it is thought to minimize the fitness
costs related to behavioral synchronization within social groups. Age
segregation of herds also contraindicates extended parental care as
typical of at least some sauropod taxa.
© 2009 Elsevier B.V. All rights reserved.

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