TY - JOUR
T1 - Evolution in the test size of deep-sea benthic foraminifera during the past 120 m.y.
AU - Kaiho, Kunio
N1 - Funding Information:
I thank the Ocean Drilling Program for providing samples used in this study, James C. Ingle for comments on early draft, and Ellen Thomas and Brian T. Huber for reviews. This work was partly supported by a grant-in-aid for scientific research from the Ministry of Education, Science and Culture of Japan.
PY - 1999/7
Y1 - 1999/7
N2 - Evidence is presented for stratigraphic variations in test size of the largest deep-water (> 1500 m water depth) calcareous trochospiral benthic foraminifera for eight dominant lineages composed of ten genera over the past 120 m.y. Variations in test size show (1) a general trend of increasing test size during the past 120 m.y. and (2) fluctuations, highlighted by six minima and six maxima, that are synchronized among genera. The long-term increase in size corresponds to an increase in the δ18O of deep-water benthic foraminifera. The minimum and maximum sizes correspond to minima and maxima in the δ18O, respectively. In addition, three major minima in test size correspond to distinct low dissolved oxygen events. These latter synchronisms indicate that oceanic climate and dissolved oxygen or related factors likely controlled evolution in test size of deep-water calcareous trochospiral benthic foraminiferal genera.
AB - Evidence is presented for stratigraphic variations in test size of the largest deep-water (> 1500 m water depth) calcareous trochospiral benthic foraminifera for eight dominant lineages composed of ten genera over the past 120 m.y. Variations in test size show (1) a general trend of increasing test size during the past 120 m.y. and (2) fluctuations, highlighted by six minima and six maxima, that are synchronized among genera. The long-term increase in size corresponds to an increase in the δ18O of deep-water benthic foraminifera. The minimum and maximum sizes correspond to minima and maxima in the δ18O, respectively. In addition, three major minima in test size correspond to distinct low dissolved oxygen events. These latter synchronisms indicate that oceanic climate and dissolved oxygen or related factors likely controlled evolution in test size of deep-water calcareous trochospiral benthic foraminiferal genera.
KW - Benthic foraminifera
KW - Body size
KW - Cenozoic
KW - Cretaceous
KW - Deep sea
UR - http://www.scopus.com/inward/record.url?scp=0032970041&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032970041&partnerID=8YFLogxK
U2 - 10.1016/S0377-8398(99)00011-0
DO - 10.1016/S0377-8398(99)00011-0
M3 - Article
AN - SCOPUS:0032970041
VL - 37
SP - 53
EP - 65
JO - Marine Micropaleontology
JF - Marine Micropaleontology
SN - 0377-8398
IS - 1
ER -