Dinosaurs are far from extinct, but dominate as birds still most regions of the globe. Part of this huge success is due to the evolution of air sacs, which are crucial for the high efficiency of their respiratory system. Scientists at the University of Bonn analyzed the structure of bones that are in contact with air sacs and found both in extinct and extant species a hitherto unknown type of bony tissue. The results now are published in “Biology Letters”.
“The respiratory organs of vertebrates exhibit a tremendous degree of diversity, but the lung-air sac system of birds is truly unique among extant species,” says Dr. Markus Lambertz from the Institute for Zoology at the University of Bonn in Germany. Air sacs are bellows-like protrusions of the lung, and their volume changes cause the air flow in the separate gas exchanger. This functional separation is crucial for the exceptional efficiency of this respiratory system, but air sacs can do more: they can invade bones, a process called “pneumatization”.
Part of a neck vertebra of the dwarf sauropod Europasaurus with deep cavities (asterisk) that presumably housed air sacs.
(c) Verändert nach Lambertz et al. (2018) Biol. Lett. doi:10.1098/rsbl.2017.0514
Pneumatized bones are very light, because they are filled with air instead of the more heavy marrow, which was not only important for active flight, but also for the evolution of gigantism in sauropod dinosaurs. Through the presence of the resulting pneumatic cavities, it has long been known that air sac-like structures predate the origin of birds, since they were found both in the gigantic sauropods as well as in carnivorous dinosaurs. However, when and potentially how many times air sacs did evolve was inaccessible until now.
Pneumosteum: a hitherto unknown type of bony tissue as a diagnostic tool
Filippo Bertozzo was pretty surprised when he analyzed the bone structure in the course of his master’s thesis at the Steinmann-Institute for Geology, Mineralogy and Paleontology of the University of Bonn: “Bones that are in contact with air sacs exhibit a unique structure composed of very fine and densely packed fibers. After it turned out that this was true both in modern birds and extinct dinosaurs, we proposed to name this special kind of bony tissue “pneumosteum”.”
Especially astonishing was the fact that pneumosteum was not only restricted to pneumatized bones, but was also found on the surface of conspicuous cavities present in cervical vertebrae of sauropod dinosaurs. Dr. Lambertz adds: “Such cavities had already previously been hypothesized as potential locations of air sacs, but only our microscopic analysis now provides convincing arguments for this.”
Other soft tissues, such as muscles, can leave traces in bone as well. “There are several types of fibers within bone tissue, but the pneumosteum is markedly different from them,” explains Prof. Dr. Martin Sander from the Steinmann-Institute in Bonn. This characteristic individuality of the pneumosteum thus makes it an excellent diagnostic tool for recognizing bones that were in contact with air sacs.
Access to the past and potential for future research
Given that pneumosteum was only discovered in the dinosaurian lineage now provides the opportunity to trace the evolutionary origin of air sacs. Especially the fact that pneumosteum is not restricted to pneumatized bones but was also found on bone surfaces opens up access to studying species that might have exhibited air sacs as part of their respiratory system, but lack obviously pneumatized bones.
Fossilization of air sacs is nearly impossible because their delicate structure is composed of only a few layers of cells. Professor Sander thus is convinced that the discovery of pneumosteum will lead to a greatly improved understanding of the evolution of the dinosaurian respiratory system. Dr. Lambertz concludes with: „This project once again highlights the importance of the interdisciplinary collaboration between zoologists and paleontologists for elucidating evolutionary history.”
Publication: Lambertz M, Bertozzo F, Sander PM (2018) Bone histological correlates for air sacs and their implications for understanding the origin of the dinosaurian respiratory system. Biology Letters 14: 20170514. http://dx.doi.org/10.1098/rsbl.2017.0514
Contact for the media:
Dr. Markus Lambertz
Institut für Zoologie
Prof. Dr. Martin Sander
Steinmann-Institut für Geologie, Mineralogie und Paläontologie
Dr. Andreas Archut | idw - Informationsdienst Wissenschaft
New research calculates capacity of North American forests to sequester carbon
16.07.2018 | University of California - Santa Cruz
Scientists discover Earth's youngest banded iron formation in western China
12.07.2018 | University of Alberta
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
18.07.2018 | Materials Sciences
18.07.2018 | Life Sciences
18.07.2018 | Health and Medicine