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ORIGIN OF MORPHOLOGICAL ABNORMALITIES IN AMMONIA (FORAMINIFERA): STUDIES IN LABORATORY AND NATURAL ENVIRONMENTS

1999; Cushman Foundation for Foraminiferal Research; Volume: 29; Issue: 2 Linguagem: Inglês

10.2113/gsjfr.29.2.152

1943-264X

V. Stouff, Emmanuelle Geslin, Jean-Pierre Debenay, M. Lesourd,

Methane Hydrates and Related Phenomena

Other| April 01, 1999 ORIGIN OF MORPHOLOGICAL ABNORMALITIES IN AMMONIA (FORAMINIFERA): STUDIES IN LABORATORY AND NATURAL ENVIRONMENTS V. Stouff; V. Stouff 1Laboratoire de Géologie, EA 2644, Faculté des Sciences, 2 Bd Lavoisier, 49045 Angers Cedex, France; and LEBIM (Laboratoire d'Études des Bio-indicateurs Marins), Ker châlon, 85350, Ile d'Yeu, France Search for other works by this author on: GSW Google Scholar E. Geslin; E. Geslin 1Laboratoire de Géologie, EA 2644, Faculté des Sciences, 2 Bd Lavoisier, 49045 Angers Cedex, France; and LEBIM (Laboratoire d'Études des Bio-indicateurs Marins), Ker châlon, 85350, Ile d'Yeu, France Search for other works by this author on: GSW Google Scholar J.-P. Debenay; J.-P. Debenay 1Laboratoire de Géologie, EA 2644, Faculté des Sciences, 2 Bd Lavoisier, 49045 Angers Cedex, France; and LEBIM (Laboratoire d'Études des Bio-indicateurs Marins), Ker châlon, 85350, Ile d'Yeu, France Search for other works by this author on: GSW Google Scholar M. Lesourd M. Lesourd 2CNRS and Service Commun de Microscopie Electronique, Faculté de Médecine, Rue Haute de Reculée, 49045 Angers Cedex, France Search for other works by this author on: GSW Google Scholar Author and Article Information V. Stouff 1Laboratoire de Géologie, EA 2644, Faculté des Sciences, 2 Bd Lavoisier, 49045 Angers Cedex, France; and LEBIM (Laboratoire d'Études des Bio-indicateurs Marins), Ker châlon, 85350, Ile d'Yeu, France E. Geslin 1Laboratoire de Géologie, EA 2644, Faculté des Sciences, 2 Bd Lavoisier, 49045 Angers Cedex, France; and LEBIM (Laboratoire d'Études des Bio-indicateurs Marins), Ker châlon, 85350, Ile d'Yeu, France J.-P. Debenay 1Laboratoire de Géologie, EA 2644, Faculté des Sciences, 2 Bd Lavoisier, 49045 Angers Cedex, France; and LEBIM (Laboratoire d'Études des Bio-indicateurs Marins), Ker châlon, 85350, Ile d'Yeu, France M. Lesourd 2CNRS and Service Commun de Microscopie Electronique, Faculté de Médecine, Rue Haute de Reculée, 49045 Angers Cedex, France Publisher: Cushman Foundation for Foraminiferal Research Received: 06 Aug 1998 Accepted: 14 Dec 1998 First Online: 03 Mar 2017 Online ISSN: 1943-264X Print ISSN: 0096-1191 © 1999 Cushman Foundation for Foraminiferal Research Journal of Foraminiferal Research (1999) 29 (2): 152–170. https://doi.org/10.2113/gsjfr.29.2.152 Article history Received: 06 Aug 1998 Accepted: 14 Dec 1998 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation V. Stouff, E. Geslin, J.-P. Debenay, M. Lesourd; ORIGIN OF MORPHOLOGICAL ABNORMALITIES IN AMMONIA (FORAMINIFERA): STUDIES IN LABORATORY AND NATURAL ENVIRONMENTS. Journal of Foraminiferal Research 1999;; 29 (2): 152–170. doi: https://doi.org/10.2113/gsjfr.29.2.152 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyJournal of Foraminiferal Research Search Advanced Search Abstract Morphological abnormalities of foraminiferal tests have been studied in cultures of Ammonia tepida and A. beccarii. Regular asexual reproduction cycles of A. tepida show the influence of high salinity on the morphology of juveniles and on the ontogenetic process. A low rate of abnormalities (about 1%) occurs under normal saline conditions (37‰). These are mainly "double tests" or a protuberance on the spiral side, or an abnormal arrangement of the first several chambers. A high rate of abnormalities among the juvenile forms (about 50%) occurs under hypersaline conditions (50‰). These abnormalities include an abnormal shape of the proloculus or of the first several chambers, a modification of the coiling plane of the first several chambers, the development of two whorls from one proloculus, or the fusion of two juveniles. Some adults exposed to hypersaline conditions before the end of their growth have also shown a strong response that is manifested either in abnormal-sized chambers, or in numerous chambers with a complex arrangement. In paralic and coastal environments characterized either by salinity fluctuations or by hypersalinity, morphological abnormalities are similar to those seen in cultures, and can be explain by the same processes.Other phenomena can cause abnormalities in the test. Asexual reproduction can lead to the construction of abnormal chambers on the umbilical side. Decalcification can result in the formation of small additional chambers or new chambers located between two septal walls of the decalcified initial chamber. Regeneration may occur after test damage; this feature is generally recognizable by the scars present on the test.To have utility for various environmental applications we recommend using the term "deformations" to describe abnormalities formed by modification of the test during the life of the foraminifer, and the term "malformations" only to describe abnormalities resulting from an anomaly in the ontogenetic development process. When the origin of the abnormality is not evident, the words "morphological abnormalities" or "abnormal tests" can be used. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.