Foraging modes of Mesozoic birds and non-avian theropods

@article{Glen2007ForagingMO,
  title={Foraging modes of Mesozoic birds and non-avian theropods},
  author={C. Glen and M. Bennett},
  journal={Current Biology},
  year={2007},
  volume={17},
  pages={R911-R912}
}
The origin and early evolution of birds has been a major topic in evolutionary biology. In the 20th century, evolutionary scenarios posited either ground-based bird ancestors or tree-dwelling ancestors. This has since been recognised as a false dichotomy [1]. We suggest that part of the problem is the loose categorisation of many extant bird species as either ground or tree locomotors when considering hind-limb function [2-7]. In reality these are not mutually exclusive alternatives. Many… Expand

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References

SHOWING 1-10 OF 44 REFERENCES
The origin and early evolution of birds
TLDR
There is no evidence for a major or mass extinction of birds at the end of the Cretaceous, nor for a sudden ‘bottleneck’ in diversity that fostered the early Tertiary origination of living bird ‘Orders’. Expand
Evidence from Claw Geometry Indicating Arboreal Habits of Archaeopteryx
TLDR
Examination of claw geometry shows that modern ground- and tree-dwelling birds can be distinguished on the basis of claw curvature, and that Archaeopteryx appears to have been a perching bird, not a cursorial predator. Expand
Archaeopteryx and the Origin of Flight
TLDR
The primordial insulative function of contour feathers and the predatory hypothesis for the enlargement of the remiges seem to account for the otherwise paradoxical presence in Archaeopteryx on essentially modern "flight" feathers. Expand
Scaling of bird claws
The claw geometry of birds can be used to predict their mode of life. Previous studies, however, have not considered how bird size might affect these predictions. Thus, in the present study, theExpand
Patterning of the follicle cell epithelium along the anterior-posterior axis during Drosophila oogenesis.
TLDR
It is shown that Notch plays a role in both the specification and patterning of the terminal follicle cells, providing a possible explanation for the defect in anterior-posterior axis formation caused by Notch and Delta mutants. Expand
THE POLARISATION OF THE ANTERIOR-POSTERIOR AND DORSAL-VENTRAL AXES DURING DROSOPHILA OOGENESIS
TLDR
The Cadherin-dependent positioning of the oocyte creates an anterior-posterior polarity that is transmitted to the embryo through the localisation and localised translation of bicoid, oskar, and nanos mRNA. Expand
Merlin, the Drosophila homologue of neurofibromatosis-2, is specifically required in posterior follicle cells for axis formation in the oocyte.
TLDR
Drosophila Merlin is specifically required only within the posterior follicle cells to initiate axis formation, and acts in response to the Gurken signal by apically targeting the signal that initiates axis specification in the oocyte. Expand
Delta signaling from the germ line controls the proliferation and differentiation of the somatic follicle cells during Drosophila oogenesis.
TLDR
Using clonal analysis, it is shown that Notch signaling controls cell proliferation and differentiation in the whole follicular epithelium and explains the axis formation defects in Notch mutants, which arise because undifferentiated posterior follicle cells cannot signal to polarize the oocyte. Expand
Delineation of a Fat tumor suppressor pathway
TLDR
The results functionally link what had been four disparate groups of D. melanogaster tumor suppressors, establish a basic framework for Fat signaling from receptor to transcription factor and implicate Warts as an integrator of multiple growth control signals. Expand
Fat Cadherin Modulates Organ Size in Drosophila via the Salvador/Warts/Hippo Signaling Pathway
TLDR
It is demonstrated that Fat limits organ size during Drosophila development via the Salvador/Warts/Hippo pathway, which aids the understanding of developmental organ size control and has implications for human hyperproliferative disorders, such as cancers. Expand
...
1
2
3
4
5
...