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Morphological change during the ontogeny of the planktic Foraminifera

Aude G. M. Caromel, Daniela N. Schmidt, Ian Fletcher and Emily J. Rayfield
Morphological change during the ontogeny of the planktic Foraminifera
Journal of Micropalaeontology (2015) 35 (1): 2-19

Abstract

Development plays an important part in shaping adult morphology and morphological disparity, yet its influence on evolutionary processes is seldom explored because of a lack of preservation of ontogenetic stages in the fossil record. By preserving their entire ontogenetic history within their test, and with the advent of high-resolution imaging techniques, planktic foraminifera allow us to investigate the influence of developmental constraints on disparity. Using Synchrotron radiation X-ray tomographic microscopy (SRXTM), we reconstruct the ontogenetic progression of seven species across several of the major morphotypic groups of planktic foraminifera, including morphotypes of a species exhibiting high phenotypic plasticity and closely related pseudo-cryptic sister-taxa. We show differences in growth patterns between the globigerinid species, which appear more tightly regulated within the framework of isometry from the neanic stage, and the globorotaliid species, whose adult stages present allometric trends. Morphological change through ontogeny results in a change in surface area to volume ratios. Different metabolic processes therefore dominate at different stages of ontogeny, changing the vulnerability of the organism to environmental influences over growth, from factors affecting diffusion rates in the juvenile to those affecting energy supply in the adult. These findings identify some of the parameters within which evolutionary mechanisms have to act.


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 35
Serial Issue: 1
Title: Morphological change during the ontogeny of the planktic Foraminifera
Affiliation: University of Bristol, School of Earth Sciences, Bristol, United Kingdom
Pages: 2-19
Published: 2015
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 50
Accession Number: 2016-014765
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
S28°31'60" - S28°31'60", E02°51'00" - E02°51'00"
N16°33'13" - N16°33'13", W79°52'00" - W79°52'00"
N05°50'60" - N05°50'60", W86°27'00" - W86°27'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201608
Program Name: ODPOcean Drilling Program
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