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Ammonoid Buoyancy


Hoffmann, René; Lemanis, Robert; Naglik, Carole; Klug, Christian (2015). Ammonoid Buoyancy. Topics in Geobiology, 43:613-648.

Abstract

The buoyancy of ammonoids is one of the most controversial issues of ammonoid paleobiology. This chapter gives a short historical review about attempts made to clarify the potential function of the cephalopod chambered shell (phragmocone) and ammonoid life habits either as benthic crawler or as free swimmers in the water column. In order to understand efficiency of buoyancy control and the mode of life of the extinct ammonoids decoupling of cameral liquid, process of osmotic pumping including local osmosis, pre-septal gas, and the role of the siphuncle and cameral liquid were discussed extensively. It is accepted that processes like osmotic pumping and local osmosis act in ammonoids due to similar architecture of the extant relatives including the presence of a siphuncle. Additionally, the calculation of buoyancy represents a major task which depends on exact reconstructions of volumes and densities for shell and soft body. With the rise of 3D-imaging techniques the determination of volumes were enhanced and now represent an important step towards more precise buoyancy calculations.

Abstract

The buoyancy of ammonoids is one of the most controversial issues of ammonoid paleobiology. This chapter gives a short historical review about attempts made to clarify the potential function of the cephalopod chambered shell (phragmocone) and ammonoid life habits either as benthic crawler or as free swimmers in the water column. In order to understand efficiency of buoyancy control and the mode of life of the extinct ammonoids decoupling of cameral liquid, process of osmotic pumping including local osmosis, pre-septal gas, and the role of the siphuncle and cameral liquid were discussed extensively. It is accepted that processes like osmotic pumping and local osmosis act in ammonoids due to similar architecture of the extant relatives including the presence of a siphuncle. Additionally, the calculation of buoyancy represents a major task which depends on exact reconstructions of volumes and densities for shell and soft body. With the rise of 3D-imaging techniques the determination of volumes were enhanced and now represent an important step towards more precise buoyancy calculations.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Paleontological Institute and Museum
Dewey Decimal Classification:560 Fossils & prehistoric life
Language:English
Date:2015
Deposited On:17 Sep 2015 11:00
Last Modified:14 Feb 2018 09:25
Publisher:Springer
ISSN:0275-0120
OA Status:Closed
Publisher DOI:https://doi.org/10.1007/978-94-017-9630-9_16

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