Fourier shape analysis and planktonic foraminiferal evolution; the Neogloboquadrina-Pulleniatina lineages

Author(s): Belyea, Paul R.; Thunell, Robert C.
Author Affiliation(s): Primary:
Gulf Oil Explor. and Prod., New Orleans, LA, United States
Volume Title: Journal of Paleontology
Source: Journal of Paleontology, 58(4), p.1026-1040. Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States. ISSN: 0022-3360 CODEN: JPALAZ
Note: In English. 51 refs.; illus.
Summary: Fifty specimens each of Pulleniatina primalis and Neogloboquadrina acostaensis were selected from 16 late Miocene to early Pliocene samples from DSDP Site 214 in the equatorial Indian Ocean. All specimens were mounted in the umbilical view and their shape outlines automatically digitized using a video scanning system. The shape of each test is represented by a series of 20 harmonic amplitudes, each representing a fixed shape summed to recreate the original test shape. A comparison of shape trends with an oxygen isotope record indicates that environmentally induced morphologic change is more pronounced in the ancestral stock, Neogloboquadrina. These ecophenotypic shape changes appear within N. acostaensis assemblages in both harmonics 2 and 3. In contrast, shape changes in P. primalis appear to be unrelated to the δ18O record. These shape changes are believed to be primarily a reflection of genetic factors. The results of this study show that Fourier shape analysis, when integrated with other criteria related to phylogenetic relationships, provides a valuable method for identifying lineages in planktonic foraminifera. Furthermore, the technique is sensitive to shape changes which are attributable to both environmental and evolutionary factors. Modified journal abstract.
Year of Publication: 1984
Research Program: DSDP Deep Sea Drilling Project
Key Words: 10 Paleontology, Invertebrate; Biologic evolution; Biometry; C-13/C-12; Carbon; Cenozoic; DSDP Site 214; Deep Sea Drilling Project; Foraminifera; Fourier analysis; Globigerinacea; Globigerinidae; Indian Ocean; Invertebrata; Isotopes; Leg 22; Microfossils; Morphology; Neogene; Neogloboquadrina; O-18/O-16; Oxygen; Paleontology; Planktonic taxa; Protista; Pulleniatina; Ratios; Rotaliina; Shape analysis; Stable isotopes; Tertiary; Tests
Coordinates: S112013 S112013 E0884305 E0884305
Record ID: 1984053034
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute.